JP3830646B2 - Drilling blade structure in 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, and more particularly to the excavating blade structure thereof.
[0002]
[Prior art]
Conventionally, as a device for creating a continuous wall in the ground, a chain member is wound endlessly along the outer peripheral surface of a guide post erected on a movable base machine, and the chain member is wound around the outer surface of the chain member. A drilling blade is provided, the guide post is inserted into the vertical hole to rotate the chain member, the base machine is moved in the continuous wall formation direction, and the ground is cut by the chain member drilling blade. Some are designed to build a continuous wall by supplying and mixing with earth and sand.
[0003]
[Problems to be solved by the invention]
However, in the conventional apparatus, since the excavating blade functions only to advance and cut the ground, the excavating blade is provided only on the outer surface side of the chain member. On the other hand, there are problems that the wall surface of the excavation which is the left and right side surfaces is easily roughened and the side wall surface is easily collapsed.
[0004]
On the other hand, the conventional excavating blade protrudes with an equal length on the outer surface of the chain member, so the biting force into the ground during excavation often falls short and can not be excavated. There was a problem that it was necessary to take extra measures such as making it happen.
[0005]
[Means for Solving the Problems]
The present invention as well as enhance the excavation side wall during continuous wall reclamation was made for the purpose of achieving an increase in excavation capability of the excavation direction.
[0006]
In order to achieve the above object, the present invention provides a continuous wall in which a chain member is wound endlessly along an outer peripheral surface of a guide post erected so that it can run freely, and a drilling blade is provided on the chain member. In the excavator, the excavating blade for excavation protrudes on the outer surface side of the chain member, and the excavating blade for reinforcing the side wall surface having the tapered surface for pressing excavated earth and sand protrudes on the inner surface side. The excavation width is made larger than the excavation width by the excavation cutting blade.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
FIG. 1 shows an example of a continuous wall excavator to which the present invention is applied. FIG. 1 (A) shows an overall schematic side view, and FIG. 1 (B) shows a front view of only a chain portion. The basic structure of the machine has a guide post 3 erected on a frame 2 of a base machine 1 that can run freely like a conventional machine so that it can be raised and lowered, and a chain member 4 along the outer peripheral surface of the guide post 3. Is wound endlessly by the drive device 5, and a drilling blade is provided on the chain member 4. The ground is excavated by the rotation of the chain member 4, and the ground is moved by moving the base machine 1. A continuous wall can be created in the ground by mixing and agitating excavated earth and sand and chemicals such as cement milk.
[0008]
The chain member 4 includes a side view in which a part of the length region is enlarged in FIG. 2 (A), a partly enlarged view in FIG. 2 (B), and a guide post 3 in FIG. As shown in the horizontal sectional view, base plates 6, 6... Are fixed to the outer surface side of every other link 4a, 4a... Of the chain member 4, and excavation blades 7 and 7 for excavation are attached to the outer surface side of this base plate 6. However, side wall surface reinforcing excavating blades 8 and 8 are respectively provided at both end positions on the inner surface side of the base plate 6.
[0009]
For example, as shown in FIG. 6, the digging blade 7 is provided so that each digging blade provided on each base plate 6 is arranged so as to fill the entire width direction of the base plate 6 when viewed from the plane.
[0010]
The excavation blades for excavation within the required range in the rotational direction of the chain member 4 (range Y in FIG. 5) are excavated excavation blades 7 ₁ , 7 ₂ , 7 as shown in FIG. 2A. _{As shown in FIG. 3,} the projecting lengths are gradually changed by a and b, and this range is defined as a modified excavation blade region Y. In the example of FIG. 2 (A), the rotating direction of the chain member 4 forward, taking into account the case of adopting the second aspect of the reversal, its front and rear most protruding length long the excavation for digging edge 7 ₃ in the central The digging blades 7 ₂ and 7 ₁ for digging whose projecting length is gradually shortened are arranged. The deformed excavation blade region Y is preferably provided at about one or two places on the entire circumference of the chain member 4.
[0011]
The side wall surface reinforcing excavating blades 8 and 8 are provided so as to incline at both ends on the inner surface side of the base plate 6 so as to form tapered surfaces 9, and the cutting edge 8a thereof is excavated for excavation as seen in FIG. In order to obtain an excavation width L ₂ slightly wider than the excavation width L ₁ by the blade 7, the outermost excavation excavation blades 7, 7 are positioned so as to protrude slightly outward from the cutting edges 7 a, 7 a.
[0012]
When the above-described excavation blades 7 are viewed from above, a plurality of (three in the figure) excavation blades 7 ', 7', 7 'slightly protrude from the other excavation blades 7 as shown in FIG. 6B, a zigzag arrangement as shown in FIG. 6B, a valley-like arrangement where the center is short as shown in FIG. 6C and gradually increases toward both ends, as shown in FIG. In this way, it is possible to appropriately select a mountain-shaped arrangement in which the center is long and gradually decreases toward both ends.
[0013]
Further, in the guide post 3, a chemical liquid passage such as cement milk is provided in the same manner as in the past, and the chemical liquid is poured into the excavated earth from the chemical discharge port 11 opened at the lower end of the guide post 3. Has been made.
3 and 4, the hatched portion indicates the ground.
[0014]
Next, the operation of the above embodiment will be described.
[0015]
A vertical hole is drilled in advance in the ground where the continuous wall is to be formed, and after inserting the guide post 3 into this vertical hole, the chain member 4 is rotated endlessly and the chemical liquid discharge port 11 is used for cement milk, bentonite, etc. The base machine 1 is run in the continuous wall forming direction while supplying the chemical solution. As a result, the ground is excavated by the excavation cutting blade 7 projecting from the outer peripheral surface of the chain member 4, and excavation grooves are formed in the lateral direction.
[0016]
During the excavation, the ground is excavated by the excavation cutting blade 7 on the outer surface side of the chain member 4, and the side walls 10 and 10 of the excavated trenches are in a rough cut state and are in a rough state. However, the cutting edge 8a of the side wall surface reinforcing excavation blades 8 and 8 on the inner surface side of the chain member 4 hits the side wall surfaces 10 and 10 of the excavation groove and cuts the side wall surfaces 10 and 10, and the excavated earth and sand are side by side. As the taper surfaces 9 and 9 of the wall-strengthening excavating blades 8 and 8 are pushed so as to press the side wall surfaces 10 and 10, the excavation surface is compressed, thereby strengthening the excavation surface into a fine state, The collapse is prevented.
[0017]
In addition, since a certain range of the 7 excavation blades 7 on the outer surface side of the chain member 4 is defined as the deformed excavation blade region Y during the excavation, the excavation blades 7 ₁ , 7 ₂ , 7 ₃ in this region are short. Since the long one hits the ground sequentially, the tip of the tip is excavated in such a way that the ground becomes difficult to dig into the ground, and the force that digs into the ground is concentrated, so that efficient cutting can be performed.
[0018]
【The invention's effect】
As described above, according to the first aspect of the present invention, after excavating a groove in the lateral direction by the excavation cutting blade provided on the outer surface side of the chain member, the side wall surface of the excavation groove is used as the inner surface side of the chain member. Since the rough excavation surface is compressed by the tapered surfaces of the side wall surface reinforcing excavating blades provided at both ends, the excavation surface of the side wall surface is strengthened and can be prevented from collapsing later. Can be created.
[0019]
Further, according to the second aspect , the excavation blade for excavation can be bite into the ground during excavation, and efficient excavation can be performed.
[Brief description of the drawings]
FIG. 1 shows an example of a continuous wall excavator as an application target of the present invention, (A) is a schematic side view of the whole, and (B) is a front view of a guide post portion.
2A is a side view of a part of a chain member, and FIG. 2B is an enlarged cross-sectional view of a part.
FIG. 3 is an overall horizontal sectional view including a guide post.
FIG. 4 is an explanatory diagram showing an excavation state.
FIG. 5 is an explanatory view showing an arrangement example of excavation blades for excavating a chain member.
FIGS. 6A to 6D are explanatory diagrams showing examples of horizontal arrangement of excavation for excavation;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base machine 2 Frame 3 Guide post 4 Chain member 6 Base plate 7 (7 ₁ , 7 ₂ , 7 ₃ , 7 ') Excavation blade 8 for excavation Side wall surface reinforcement excavation blade 9 Tapered surface 10 Side wall surface 11 Chemical solution discharge port

Claims (2)

  In a continuous wall excavator in which a chain member is wound endlessly along an outer peripheral surface of a guide post erected so that it can run freely, and a drilling blade is provided on the chain member, on the outer surface side of the chain member A digging blade for digging is projected and a side wall surface reinforcing digging blade having a tapered surface for pressing digging earth and sand is projected on the inner surface side. Excavation blade structure in a continuous wall excavator characterized by being larger. At least one modified excavation blade region projecting with different cutting blade lengths is provided in the chain member so that the protruding length of the excavation blade gradually increases along the rotation direction of the chain member. The excavation blade structure in the continuous wall excavator according to claim 1, wherein the excavation blade structure has at least one location.

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