JP2806288B2 - Hydro phrase excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrophrase excavator capable of performing a suitable process for connecting a succeeding panel between preceding panels in an underground continuous wall construction method.

[0002]

2. Description of the Related Art One of the methods for constructing an underground continuous wall is to construct a pair of preceding panels in the ground, excavate an intermediate ground between each preceding panel, and construct a succeeding panel in a formed vertical hole. And there is a construction method to inherit.

[0003] In this case, the joint surface of each preceding panel has irregularities, and if the succeeding panel is not joined, good water stopping properties cannot be obtained. Therefore, this method is called a cutting joint method, and a hydrophrase excavator is used. The cutter drum is used to cut the joint surface simultaneously with excavation of the intermediate ground. Further, depending on the model, the water stopping performance is further improved by forming a key groove on the joint surface using an auxiliary cutter drum that protrudes to be able to protrude and retract on both sides of the frame.

[0004] As shown in FIG. 4, the excavator includes a pair of main cutter drums 2 rotatably arranged at a lower portion of a frame 1 and an upper portion of the main cutter drum 2 .
Arms 3 arranged to be able to appear on both sides of frame 1
An auxiliary cutter drum 4 rotatably supported at the tip of the arm 3 for cutting a key groove, and a plunger which is horizontally disposed in the frame 1 and whose tip plunger is connected to each of the arms 3 and is swung in the protruding / retracting direction. And a hydraulic jack 5 for moving the front panel P by the main cutter drum 2.
In addition to excavating the intermediate ground E, cutting the joint surface P1 of each preceding panel P, and driving the jack 5 so that the arm 3 protrudes, the auxiliary cutter drum 4 causes the center of the joint surface of the preceding panel P to be cut. Is cut to form a key groove P2.

[0005]

However, the cross-sectional shape of the auxiliary cutter drum 4 is rectangular.
For this reason, the vertical section of the keyway P2 is divided into rectangular recesses as shown in FIG. 5, but in the case of this type of shape, the rectangular side surface is a non-cut surface. ,
Since the cutting resistance is large and the stroke and the driving force of the jack 5 are also limited by the width of the frame 1, it has been a limit to form a keyway having a depth of, for example, about 5 to 10 cm at the maximum.

On the other hand, since it is difficult to reliably maintain the vertical accuracy of the frame 1, even if the joint surface of the preceding panel P is cut by the main cutter drum 2 prior to cutting the keyway, the auxiliary cutter drum 4 If there is unevenness exceeding the limit cutting depth of 5 to 10 cm, the depth of the key groove becomes shallow, and in particular, when the cutting depth becomes deep, a portion where the key groove is not substantially formed occurs, In addition, there is a fear that the joint strength between panels may be affected.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to increase the cutting depth of a keyway by reducing the cutting surface shape of an auxiliary cutter drum with a small cutting resistance, thereby improving the water stopping performance and An object of the present invention is to provide a hydrophrase excavator with improved joint strength.

Another object of the present invention is to make it possible to easily attach and detach the seed auxiliary cutter drum.

[0009]

In order to achieve the above object, a hydrophrase excavator according to the present invention comprises a frame suspended between a pair of leading panels so as to be able to move up and down, and a rotatable lower portion of the frame. A pair of main cutter drums that are arranged and excavate the intermediate ground between the preceding panels, and cut a joint surface of each of the preceding panels, and for cutting key grooves arranged to be able to appear and retract on both sides of the frame. An auxiliary cutter drum and a jack for projecting and retracting the auxiliary cutter are provided, and the cross-sectional shape of the auxiliary cutter drum is semicircular or trapezoidal.

The auxiliary cutter drum and the jack according to the present invention are arranged in an auxiliary frame having substantially the same width and thickness as the frame, and connect the auxiliary frame to an appropriate position of the frame. It is incorporated in the frame by arranging it (claim 2).

[0011]

According to the above construction, the cutting resistance of the key groove can be reduced by the cutting surface shape of the auxiliary cutter drum,
As a result, the cutting depth can be made about twice as large as the conventional one while the drive mechanism of the auxiliary cutter drum can be reduced.

According to the structure of the second aspect, the auxiliary cutter drum and its driving mechanism can be assembled into a frame in a unitized state. As a result, the drive mechanism of the auxiliary cutter drum can be made smaller, so that replacement is easy.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a hydrophrase excavator according to the present invention. The excavator comprises a frame 10 having a pair of reaction plates 10a which are vertically long and are disposed above and below and project in the horizontal direction. A pair of main cutter drums 12 rotatably disposed at the lower portion of the frame 10, and a plurality of bolts and the like incorporated in upper and lower extension portions formed at appropriate positions on the frame 10 at the upper portion of the main cutter drum 12. It has a rectangular frame-shaped auxiliary frame 14 which is detachably fixed via the auxiliary frame.

The auxiliary frame 14 constitutes a unit for cutting a keyway which is added to the body of the excavator which is substantially equal to or larger than the width and thickness dimensions of the frame 10. As shown in detail in FIG. 1, a link arm 18 symmetrically pivotally supported via a pin 16 and protruding to the outside of the frame 10, and rotatably supported at a pivoting tip of the arm 18. The auxiliary cutter drum 20 for cutting the keyway is vertically disposed and fixed in the auxiliary frame 14 via the pin 22, and the tip plunger 24 a is connected to the upper end side of each of the arms 18 via the pin 26. And a drain jack 30 connected to a drain pump 28 (see FIG. 1) formed at the center of the lower part of the frame 1 at the center thereof.
Are fixedly arranged, and openings and the like for inserting hydraulic hoses for driving various driving units and the like are formed on the upper and lower sides.

A hydraulic drive motor (not shown) is built in the auxiliary cutter drum 20 and is driven to rotate. The outer peripheral cutting surface 20a has a shape as shown in FIG. 3 (a). And a trapezoidal shape as shown in FIG.

Therefore, in the above-structured hydrophrase excavator, the intermediate ground E between the preceding panels P is excavated by the main cutter drum 12, and the joint surface P1 of each preceding panel P is cut. In parallel with this, a keyway P2 is formed by cutting the center of the joining surface P1 of the preceding panel P by the auxiliary cutter drum 20 while driving the hydraulic jack 24 to project the arm 18.

Here, the horizontal cross-sectional shape of the key groove P2 formed in the preceding panel P is the same as that of the auxiliary cutter drum 2.
0 or a trapezoidal shape according to the shape of the cutting surface 20a. In this shape, the arc surface or the oblique side of the trapezoid is also used as the cutting surface at the same time, so that the cutting resistance is smaller than that of the rectangular shape. Since the hydraulic jack 24 is arranged vertically, the stroke amount of the plunger 24a can be sufficiently obtained without being limited by the width of the frame 10, so that the cutting depth according to the protrusion amount of the arm 18 can be obtained. And a cutting depth of about 10 to 20 cm, which is about twice the conventional value, even with the same driving force.

Therefore, even if there is a cutting residue at the joining portion P1 of the preceding panel P by the main cutter drum 12 and there are irregularities, a maximum of about 20 times which is about twice that of the conventional case.
A keyway P2 with a cutting depth of cm can be obtained.

When using only the main cutter drum 12 or replacing the main cutter drum 12 with another function, the union of a hydraulic hose (not shown) for driving the auxiliary cutter drum 20 and the hydraulic jack 24 is removed, and the auxiliary frame 14 is removed. Can be removed from the frame 10 and the joints of the frame 10 can be joined to each other or an auxiliary frame 14 having another mechanism can be attached, and the replacement operation can be simplified.

[0021]

As explained in detail in the above embodiment, in the hydrophrase excavator according to the first aspect of the present invention, the cutting resistance of the keyway is reduced by the cutting surface shape of the auxiliary cutter drum, and the cutting depth is reduced. Can be increased to about twice that of the related art, so that even in a place where the cutting depth is deep, the waterproofness and the joint strength between panels can be reliably improved.

According to the second aspect of the present invention, the auxiliary cutter drum and its driving mechanism can be assembled into the frame in a unitized state, and replacement work for multifunctionalization such as adding an auxiliary function can be performed. It will be easier.

[Brief description of the drawings]

FIG. 1 is a front view of a hydrophrase excavator according to the present invention.

FIG. 2 is an enlarged sectional view of a portion A in FIG.

FIGS. 3 (a) and 3 (b) are partial cross-sectional views showing a cutting surface shape of an auxiliary cutter drum in the excavator and a keyway shape of a preceding panel formed by the cutting surface.

FIG. 4 is a front view of a conventional hydrophrase excavator equipped with a keyway cutting auxiliary cutter drum.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

 10 Frame 12 Main cutter drum 14 Auxiliary frame 18 Arm 20 Auxiliary cutter drum 20a Cutting surface 24 Hydraulic jack P Leading panel P1 Joint surface P2 Keyway

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) E02F 5/02 E02D 5/20 103 E02D 5/18 103 E02D 17/13

Claims (2)

(57) [Claims] 1. A frame suspended between a pair of preceding panels so as to be able to ascend and descend, and rotatably disposed below the frame, excavating intermediate ground between the preceding panels, and A pair of main cutter drums for cutting a joining surface, an auxiliary cutter drum for cutting a key groove, which is disposed on both sides of the frame so as to be able to protrude and retract, and a jack for protruding and retracting the auxiliary cutter, the auxiliary cutter drum A hydrophrase excavator, wherein the cross-sectional shape of the excavator is a semicircle or trapezoid. 2. The auxiliary cutter drum and the jack are arranged in an auxiliary frame having substantially the same width and thickness as the frame, and the auxiliary frame is connected to an appropriate position on the frame. The excavator according to claim 1, wherein the excavator is incorporated into the frame.