JP4090598B2 - Continuous wall excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a continuous wall excavator for creating a continuous wall in the ground.
[0002]
[Prior art]
As a means for creating a continuous wall in the ground, the chain member is wound so as to endlessly rotate along the outer peripheral surface of the guide post that is suspended and supported by a base machine that can travel freely, and the outer peripheral surface of this chain member There is known a continuous wall excavator having rod-shaped excavating blades protruding at a predetermined pitch.
[0003]
In order to create a continuous wall using the excavator, a guide post is inserted and set in a previously excavated vertical hole, and the base machine is moved while rotating the chain member, so that a continuous hole is formed in the traveling direction. The chemical solution is poured while excavating the soil, and it is stirred and mixed with the excavated earth and sand to create a continuous wall.
[0004]
[Problems to be solved by the invention]
Therefore, in the above excavator, when the excavation work is interrupted for a long time and the guide post is left standing in the ground, the excavated sediment and the injected chemical solution are consolidated and solidified, and the guide post is moved vertically and horizontally. There are cases where the robot is restrained so that it cannot move, and a great deal of labor and time is spent on the work for solving this restrained state.
[0005]
[Means for Solving the Problems]
The present invention, continuous guide post is configured to be able to shift to excavation work to eliminate immediately be bound by solidification of the sediment and chemical when prolonged leave it crowded denominated the guide posts into the ground A wall excavator, which is supported by a movable base machine and extends vertically, a drive sprocket driven by a drive shaft provided above the guide post, and a shaft at the lower end of the guide post A worn guide sprocket, an endless chain member wound around the drive sprocket and the guide sprocket and running around the left and right end surfaces of the guide post, front and rear side surfaces of the guide post, and surrounding ground; The side cutter attached to the chain member and the drive sprocket are arranged coaxially so as to sandwich the drive sprocket back and forth A pair of guide wheels before and after that is, a, a guide member extending respectively between said guide post and said pair of front and rear guide wheels.
The side cutters have pivots extending in the running direction of the chain member, and are pivotally supported by a pair of front and rear hinges supported by the chain member and the pair of front and rear hinges, respectively. A pair of front and rear cutters that can be opened and closed between a closed state in which they are close to each other and an open state in which their tips are spaced apart from each other, and a spring that biases the pair of front and rear cutters in the closed state. is doing.
When the pair of front and rear cutters circulate as the chain member runs, the pair of front and rear cutters approach and contact the front and rear side surfaces of the guide post, respectively, and are closed to release contact with the surrounding ground. A pair of guide wheels and the guide member are configured to slide and follow an open state in which interference with the drive shaft is avoided.
[0006]
As a result, after the excavation operation is stopped, if the chain member is rotated when the excavation operation is resumed, the edge cutter side cutter circulates the guide post as the chain rotates, and the front and rear sides of the guide post Accordingly, the excavated earth and sand and the solidified chemical solution fixed to the guide post are peeled off, and the restraint state can be immediately released when restarting after the excavation operation is suspended.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0008]
FIG. 1 shows an overall side view of an embodiment of a continuous wall excavator according to the present invention. A crawler-type base machine 1 is provided with a portal frame 2, and the portal frame 2 is rectangular in cross section by a steel plate. A guide post 3 formed in a box shape is supported by guide rails 4 and 5 through a holder 6 so as to be movable up and down and laterally as is well known.
[0009]
The support means of the guide post 3 by the holder 6 connects the tip of the piston rod of a hydraulic cylinder (not shown) and the connecting pin holes provided on both sides of the guide post 3 with pins as in the conventional case. By replacing the pins, the guide posts 3 are sequentially press-fitted along the guide rails by a worm movement, or the guide posts 3 are suspended by wires and pushed by their own weight or a press-fitting cylinder.
[0010]
A guide sprocket 7 is pivotally attached to the lower end of the guide post 3, and the holder 6 has a drive sprocket 10 driven by a motor 8 through a speed reducer in a speed reducer section 9. Is wound so as to be endlessly rotatable, and is configured such that the chain member 11 travels along the left and right end surfaces 3a, 3a on the narrow side of the guide post 3.
[0011]
Excavation blades 12, 12,... Are fixedly projected on the outer peripheral surface of the chain member 11 with a constant pitch, as shown in FIGS. This excavation blade 12 has a structure in which a plurality of blade portions 14, 14... Project from the outer surface of the base portion 13 fixed to the chain member 11. The blade portions 14, 14. .., 12... Are different from each other, and the entire horizontal direction is covered by the blade portions 14, 14.
[0012]
As shown in FIGS. 2 and 3, a guide member 15 on the holder 6 side is provided from a spaced position on both sides of the drive sprocket 10 to the upper end of the guide post 3, and the guide on the shaft 16 of the drive sprocket 10. Disc-shaped guide wheels 17 and 17 are fixed to respective outer positions of the member 15, and the outer peripheral edge outer surface side of the guide wheels 17 and 17 is an inclined peripheral surface 17 a.
[0013]
Reference numeral 18 denotes a track roller provided for bridging the chain member 11 from the side surface region of the guide post 3 to the drive sprocket 10.
[0014]
The chain member 11 is provided with an edge cutting side cutter 20 for cutting an edge between the solidified material solidified by the excavated earth and sand, a chemical solution, and the like and the guide post 3. The side cutter 20 includes a plate 21 having a width outside is secured to the peripheral surface of the corresponding thickness of the guide post 3 of the chain members 11, openably pivoted by hinges 22 and 22 on both sides of the front and rear of the plate 21 The cutters 23 and 23 and springs 24 and 24 (plate springs) that urge the cutters 23 and 23 in the direction in which their tips approach each other, and the left and right end surfaces 3a and 3a of the guide post 3 are formed. It is formed to surround. The cutters 23, 23 are plate-shaped having a substantially trapezoidal shape with the hinge 22 as the bottom so that the tips are slightly narrower. The tips of the cutters 23, 23 are the guide member 15 on the holder 6 side and the front and rear sides. It extends to a position along the outer periphery of the pair of guide wheels 17, 17, and is configured to slide along the guide member 15 and the guide wheel 17 when the chain member 11 circulates as the chain member 11 rotates. Has been.
[0015]
In FIG. 2, three side cutters 20 are drawn, but this is shown for convenience in order to show the state of the side cutter 20 when it is moved, and at least one is actually provided. .
[0016]
That is, when the side cutter 20 is at the b position shown in Figure 2, the cutter 23 as shown in FIG. 4 the cutter 23 is placed along the inclined peripheral surfaces 17a of the pair of guide wheels 17 before and after the open Thus , the shaft 16 is avoided. The cutter 23, 23 when in the B position in a state where little open as in FIG. 5 is placed along the holder 6 side of the guide member 15, the cutter 23, 23 spring 24 when further in Ha position, 6, the cutter 23 is placed in a closed position as shown in FIG. 6. At this time, the cutters 23, 23 are brought close to or in contact with the front and rear side surfaces 3 b, 3 b of the guide post 3 by appropriate stoppers. .
[0017]
Inside the guide post 3, a chemical solution supply path (not shown) is provided in the same manner as in the prior art so that the chemical solution can be ejected into the ground from the lower end of the guide post 3 or near the lower end.
[0018]
Next, the operation of the above embodiment will be described.
[0019]
While the base machine 1 is moved to the continuous wall construction position, the guide post 3 is inserted into a pre-drilled vertical hole by a press-fitting cylinder or the like, and then the chemical liquid is supplied through the chemical liquid supply path while the chemical liquid is poured out into the ground. an endless chain member 11 is orbiting, by moving the base machine 1, the outer peripheral excavation digging edge 12, 12 ... ground is excavated by projecting the chain member 11 is formed in the lateral direction.
[0020]
During the excavation, the side cutter 20 is the guide post 3 orbiting the front and rear side 3b of always guide post 3 is the cutter 23, will be moved along the 3b, the front and rear guide posts 3 side 3b, The excavation groove is formed while exfoliating excavation earth and sand adhering to 3b .
[0021]
When resuming excavation work after leaving the excavator in the vertical hole for a long time, the side cutter 20 moves the guide post 3 by starting the motor 8 and rotating the endless chain member 11. Even if the guide post 3 is restrained in a state in which it cannot move in the left-right direction due to solidification of earth and sand or chemicals, the lap around and the contact between the front and back side surfaces 3b, 3b of the guide post 3 and the surrounding ground are released. Can be easily eliminated, and it is possible to immediately shift to excavation work.
[0022]
Even if the guide post 3 is not in a restrained state, the friction between the guide post 3 and the ground can be reduced and the excavation work can be started more smoothly.
[0023]
【The invention's effect】
As described above, according to the present invention, the side cutter for edge cutting that moves along the front and rear side surfaces of the guide post to the chain member for excavating the ground by projecting the excavating blade and circling the guide post Even if the guide post is solidified by excavating soil compaction or chemicals and restrained so that it cannot move when resuming excavation work, the restraint state can be canceled by starting the chain member, It is possible to immediately shift to excavation work without requiring manual restraint releasing work as in the prior art.
[0024]
Also, the side cutter can be opened and closed so as to avoid the drive shaft of the drive sprocket when rotating the chain member, so there is no need to remove it every time during excavation work, and excavation is always performed without any trouble. Work can be done.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the present invention.
FIG. 2 is an enlarged front view of a P portion in FIG.
FIG. 3 is a side view of the same.
4 is a cross-sectional view corresponding to AA in FIG. 2;
FIG. 5 is a cross-sectional view corresponding to BB in FIG. 2;
6 is a cross-sectional view corresponding to CC in FIG. 2;
[Explanation of symbols]
3 Guide post
3a, 3a Left and right end faces
3b, 3b Front and rear side surfaces 6 Holder 7 Guide sprocket 9 Reducer portion 10 Drive sprocket 11 Chain member 12 Excavation blade 15 Guide member
16 Shaft 17 Guide wheel 18 Track roller 20 Side cutter 23 Cutter 24 Spring

Claims (1)

A guide post supported in a freely movable base machine and extending in the vertical direction;
A drive sprocket driven by a drive shaft provided above the guide post;
A guide sprocket pivotally attached to the lower end of the guide post;
An endless chain member wound around the drive sprocket and the guide sprocket and running around the left and right end faces of the guide post;
A side cutter attached to the chain member for releasing the adhesion between the front and rear sides of the guide post and the surrounding ground;
A pair of front and rear guide wheels provided coaxially so as to sandwich the drive sprocket forward and backward,
A guide member extending between the guide post and the pair of front and rear guide wheels,
With
The side cutter is
A pair of front and rear hinges supported by the chain member, each having a support shaft extending in the travel direction of the chain member;
A pair of front and rear cutters that are pivotally supported by the pair of front and rear hinge shafts, and that can be opened and closed between a closed state in which their tips approach each other and an open state in which their tips are spaced apart from each other;
A spring for biasing the pair of front and rear cutters to the closed state,
When the pair of front and rear cutters circulate with the travel of the chain member, the front and rear side surfaces of the guide post approach or contact with the front and rear side surfaces, respectively, and are closed to release contact with the surrounding ground. A continuous wall excavator configured to take an open state in which the guide wheel and the guide member slide along each other to avoid interference with the drive shaft.

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