JPH08218379A - Hydrofraise excavator - Google Patents

Abstract

PURPOSE: To increase cutting depth of a key way and to promote cut-off efficiency and placing joint strength by making a cutting surface shape of an auxiliary cutter drum as small cutting resistance. CONSTITUTION: A shape of the circumferential cutting surface 20a of an auxiliary cutter drum 20 is formed in the shape of a roughly semi-circle or a trapezoid. As a result, a horizontal sectional shape of a key way P2 formed in an antecedent panel P is formed in the shape of a semi-circle or a trapezoid in accordance with the shape of the circumferential cutting surface 20a of the auxiliary cutter drum 20, and in that shape, since a circular surface or an oblique side of trapezoid is also utilized as the cutting surface simultaneously, cutting resistance is smaller than that of a rectangle. By the constitution, cutting depth can be increased, and cut-off efficiency and placing joint strength of panels can be promoted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydro-phrase excavator capable of performing suitable processing 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 construction methods for constructing a continuous underground wall is to construct a pair of preceding panels in the ground, excavate the intermediate ground between the preceding panels, and construct a trailing panel in the vertical hole formed. However, there is a construction method to continue.

In this case, since the splicing surface of each preceding panel has irregularities and if the succeeding panels are spliced as it is, good water-stopping properties cannot be obtained. Therefore, this is called a cutting joint construction method and a hydro phrase excavator is used. The cutter drum is excavating the intermediate ground and cutting the joint surface at the same time. In addition, depending on the model, there is one that further improves the water stopping performance by forming a key groove on the striking surface by using an auxiliary cutter drum projecting so that it can project and retract on both sides of the frame.

As shown in FIG. 4, this excavator has a pair of main cutter drums 2 rotatably arranged at the lower part of a frame 1 and an upper part of the main cutter drum 2 ,
Arms 3 arranged on both sides of the frame 1 so that they can appear and disappear.
And an auxiliary cutter drum 4 for cutting a key groove, which is rotatably supported at the tip of the arm 3, and a tip plunger that is horizontally arranged in the frame 1 and is connected to each arm 3 and rocks in the retracting direction. It is equipped with a hydraulic jack 5 for moving, and the preceding panel P is provided by the main cutter drum 2.
While excavating the intermediate ground E between, the cutting surface P1 of each preceding panel P is cut, and the jack 5 is driven to cause the arm 3 to project while the auxiliary cutter drum 4 is used to center the connecting surface of the preceding panel P. 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 longitudinal section of the key groove P2 is divided into rectangular concave portions as shown in FIG. 5, but in the case of this kind of shape, the rectangular side surface portion 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 depending on the width of the frame 1, the maximum limit is to form a key groove having a depth of about 5 to 10 cm.

On the other hand, since it is difficult to reliably maintain the vertical accuracy of the frame 1, even if the joining surface of the preceding panel P is cut by the main cutter drum 2 prior to the key groove cutting, the auxiliary cutter drum 4 If there is unevenness that exceeds the limit cutting depth of 5 to 10 cm, the depth of the key groove will be shallow, and especially if the cutting depth becomes deep, there will be a part where the key groove is not substantially formed, In addition, there was a fear of affecting the joint strength between the panels.

The present invention has been made to solve the above problems, and its purpose is to increase the cutting depth of the key groove by reducing the cutting resistance of the auxiliary cutter drum so that the cutting depth of the key groove is increased. The present invention provides a hydro phrase excavator with improved joint strength.

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

[0009]

In order to achieve the above object, a hydrophrase excavator according to the present invention is provided with a frame suspended between a pair of preceding panels so as to be able to move up and down, and to be rotatable below the frame. A pair of main cutter drums that are arranged and excavate the intermediate ground between the preceding panels, and cut the joint surface of each of the preceding panels, and a key groove for cutting that is arranged on both sides of the frame so as to be retractable. An auxiliary cutter drum and a jack for retracting the auxiliary cutter drum are provided, and the auxiliary cutter drum has a semicircular or trapezoidal cross-sectional shape (claim 1).

Further, the auxiliary cutter drum and the jack according to the present invention are arranged in an auxiliary frame formed to have substantially the same width and thickness as the frame, and the auxiliary frame is connected to an appropriate position of the frame. It is characterized in that it is incorporated in the frame by arranging it (claim 2).

[0011]

With the above structure, the cutting resistance of the key groove can be reduced by the cutting surface shape of the auxiliary cutter drum.
As a result, the driving depth of the auxiliary cutter drum can be reduced, and the cutting depth can be doubled from the conventional one.

With the structure of the second aspect, the auxiliary cutter drum and its driving mechanism can be incorporated into the frame in a unitized state. As a result of being able to make the drive mechanism of the auxiliary cutter drum small, replacement is easy.

[0013]

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 shows a hydrophrase excavator according to the present invention, which is a frame 10 having a pair of reaction plates 10a which are vertically long and which are arranged above and below and project in the left-right direction. A pair of main cutter drums 12 rotatably arranged at the lower part of 10 and upper and lower parts of the main cutter drum 12 are assembled into upper and lower joint parts formed at appropriate positions of the frame 10 so that a plurality of bolts, etc. A rectangular frame-shaped auxiliary frame 14 is detachably fixed via the auxiliary frame 14.

The auxiliary frame 14 constitutes a unit for cutting a key groove which is added to the excavator main body portion having a width and a thickness which are substantially equal to those of the frame 10. The auxiliary frame 14 has a structure as shown in FIG. As shown in detail in FIG. 2, a link arm 18 is supported symmetrically through a pin 16 so as to be swingable and protrudes to the outer side of the frame 10, and is rotatably supported at the swinging tip of the arm 18. The auxiliary cutter drum 20 for cutting the key groove is vertically arranged and fixed in the auxiliary frame 14 through the pin 22, and the tip plunger 24a is connected to the upper end side of each arm 18 through the pin 26. And a hydraulic jack 24, and a sludge pipe 30 connected to a sludge pump 28 (see FIG. 1) formed at the center of the lower portion of the frame 1 in the center thereof.
Is fixedly arranged, and further, openings and the like for inserting hydraulic hoses for driving various driving parts 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, and the shape of the outer peripheral cutting surface 20a is as shown in FIG. 3 (a). Has a substantially semicircular shape or a trapezoidal shape as shown in FIG.

Therefore, in the hydrophrase excavator having the above construction, the main cutter drum 12 excavates the intermediate ground E between the preceding panels P and cuts the joint surface P1 of each preceding panel P. In parallel with this, the hydraulic jack 24 is driven to project the arm 18, and the auxiliary cutter drum 20 cuts the center of the striking surface P1 of the preceding panel P to form a key groove P2.

Here, the horizontal sectional shape of the key groove P2 formed in the preceding panel P is the auxiliary cutter drum 2 described above.
The cutting surface 20a of 0 has a semicircular or trapezoidal shape depending on the shape, but in this shape, an arc surface or a trapezoidal hypotenuse portion is also used as a cutting surface at the same time, so that the cutting resistance is larger than that of a rectangular shape. Further, since the hydraulic jack 24 is vertically arranged, the stroke amount of the plunger 24a can be sufficiently obtained without being restricted by the width of the frame 10. Therefore, the cutting depth corresponding to the protrusion amount of the arm 18 can be obtained. Even if the driving force is the same, the cutting depth is about 10 to 20 cm, which is about twice as large as the conventional one.

Therefore, even if there is a cutting residue on the joint P1 of the preceding panel P by the main cutter drum 12 and there is unevenness, it is about 20 times at maximum, which is about twice as much as the conventional one.
A keyway P2 with a cutting depth of cm can be obtained.

When only the main cutter drum 12 is used or when it is replaced with another function, the unillustrated union of the hydraulic hose 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 joint portions of the frame 10 can be joined to each other, or the auxiliary frame 14 having another mechanism can be attached, and the replacement work can be simplified.

[0021]

As described above in detail with reference to the embodiments, in the hydrophrase excavator according to the invention of claim 1, the cutting surface shape of the auxiliary cutter drum reduces the cutting resistance of the key groove and the cutting depth. Since it can be about twice as large as that of the conventional one, it is possible to reliably improve the waterproofness and the joint strength between panels even at a deep cutting depth.

According to the structure of claim 2, the auxiliary cutter drum and its driving mechanism can be incorporated into the frame in a unitized state, and replacement work for multi-functionalization such as addition of an auxiliary function can be performed. It will be easy.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view of part A in FIG.

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 key groove shape of a preceding panel formed thereby.

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

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

[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 preceding panel P1 connecting surface P2 key groove

Claims (2)

[Claims] 1. A frame which is suspended between a pair of preceding panels so as to be able to move up and down, and a frame which is rotatably disposed below the frame and excavates an intermediate ground between the preceding panels. The auxiliary cutter drum is provided with a pair of main cutter drums for cutting the striking surface, an auxiliary cutter drum for cutting a key groove arranged on both sides of the frame so as to be retractable, and a jack for retracting the auxiliary cutter. A hydro phrase excavator having a semicircular or trapezoidal cross section. 2. The auxiliary cutter drum and the jack are arranged in an auxiliary frame formed to have substantially the same width and thickness as the frame, and the auxiliary frame is connected and arranged at an appropriate position of the frame. The hydro-phrase excavator according to claim 1, wherein the hydro-phrase excavator is incorporated into the frame.