JP2004263529A - Excavation-direction underground sectional inverted t-shaped and l-shaped continuous wall work execution machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work execution machine for easily building a continuous wall, which cannot be manufactured by a conventional method or requires a high cost and in which an excavation-direction underground cross section is formed in an inverted T-shape and L-shape. <P>SOLUTION: A rotary driving device 3 is installed to the upper section of a self-propellent work execution machine body 1, and a rotating and driving screw rod 5 with an excavating blade is connected while horizontal-direction screw rods 6 and 6' with the excavating blades using the rotation of the screw rod 5 as a power source are juxtaposed. A work execution-section rotary function is added to a driving section, and a reaction receiver 8 to the rotating and driving screw rod 5 with the excavating blade is mounted. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a construction machine for forming a continuous wall in an inverted T-shape and an L-shape in a digging direction in a retaining wall, a retaining wall, a foundation pile, a ground improvement, and the like.
[0002]
[Prior art]
Conventionally, in order to construct an underground continuous wall, a soil-cement mixing method or the like in which a multiaxial auger drill or the like is used to reach a desired depth and a solidifying agent liquid is injected into an in situ soil and mixed and stirred. I have been.
[0003]
Such a construction method has problems of groundwater leakage and strength at a joint from excavation to the next excavation, and has a problem that a process is complicated and a construction period is long, such as excavation in which a part is overlapped. In order to construct a wall ditch having a substantially rectangular cross-sectional shape, the excavated cross-sectional shape was circular, so that a wasteful portion was inevitable.
[0004]
As a method of solving these problems, a number of excavating blades projecting outward in the radial direction are attached to the outer periphery of a screw blade (spiral blade) provided around the rotation axis of the auger working machine, Various methods have been devised for creating an underground continuous wall of a set width by continuously excavating a ground without reaching a destination (see Patent Documents 1 and 2).
[Patent Document 1]
JP-A-9-316919
[Patent Document 1]
JP 2001-336146 A
[0005]
[Problems to be solved by the invention]
However, these methods can form a continuous wall having a rectangular cross section perpendicular to the excavation direction and a constant width, but cannot construct a continuous wall having an inverted T-shaped or L-shaped cross section perpendicular to the excavation direction. At present, a method of cutting and performing installation of an inverted T-shaped or L-shaped panel (Japanese Patent No. 3306372) is employed.
[0006]
When digging and installing an inverted T-shaped or L-shaped panel, to dig and bury the stable ground of the ground, the ground becomes weaker than before digging the buried part, The ground behind it is also disturbed by a large area. Also, during construction of the inverted T-shaped or L-shaped retaining wall, it is necessary to temporarily store most of the earth and sand that has been removed from the ground, which requires a large space.
[0007]
Therefore, an object of the present invention is to provide a construction machine for easily constructing a continuous wall groove having an inverted T-shaped or L-shaped underground section in the excavation direction which cannot be obtained by the above-mentioned conventional method.
[0008]
[Means to solve the problem]
In order to achieve the above object, the present invention provides a construction machine for constructing an underground continuous wall, in which a rotary drive unit is provided on an upper part of a self-propelled construction machine body, and a screw rod with a drilling blade which is driven to rotate is connected. And a construction machine in which a horizontal screw rod with a cutting blade powered by rotation of the screw rod with a cutting blade is provided at a lower end thereof, and a rotation function of the construction unit is added to the driving unit. The construction machine further comprises a reaction force receiver for the above-mentioned screw rod with an excavating blade driven in rotation.
[0009]
As a result, the screw rod with the digging blade and the horizontal screw rod with the digging blade are erected along the leader to a predetermined depth while being driven to rotate, and the crawler is moved horizontally from there to excavate, thereby excavating the ground in the digging direction. A continuous wall groove having an inverted T-shaped and L-shaped middle section can be easily constructed.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. FIG. 1 shows an embodiment of a construction machine for an inverted T-shaped continuous wall underground in the excavation direction used for carrying out the present invention, and FIG. 1A is a side view and FIG. -2) is a front view thereof, and FIG. (1-3) is a cross-sectional view taken along each arrow in FIG. (1-2). FIG. 2 is an enlarged cross-sectional view of the vicinity of the gear box 10 as viewed from each arrow.
[0011]
As shown in FIG. 1, a rotary drive device 3 having a drive motor is provided which is engaged with a guide rail of a reader 2 erected at the front of a construction machine main body 1 and is connected to the rotary drive device 3. An elevating device 4 is provided. A screw rod 5 (screw rod with a cutting blade) having a cutting blade 16 attached to the outer peripheral edge of the screw blade is connected to the rotation driving device 3, and the rotation of the screw rod 5 with the cutting blade is used as a power source at the lower end thereof. In the same manner as described above, a horizontal screw rod 6 having an excavating blade 16 attached to the outer peripheral edge of the screw blade is attached.
[0012]
The screw rod 5 is rotated by the rotational force of the rotation drive device 3, and the rotation is transmitted to the horizontal screw rods 6, 6 ′ by the sprocket 14 through the lower end bevel gear 13. , 6 ′ are supported by the gearbox 10. Then, the reaction force receivers 8 of the upper and lower screw rods 5 and 6 are arranged along the screw rod 5.
[0013]
A rotation device 7 is provided below the rotation drive device 3 so that the horizontal screw rods 6 and 6 ′ can rotate together with the reaction force receiver 8 about the screw rod 5. This rotating device 7 is for preventing the horizontal screw rods 6, 6 'and the crawler 11 from intersecting with each other by setting the horizontal screw rods 6, 6' and the crawler 11 in parallel in the length direction at the time of installation. is there. The rotating device 7 is configured to rotate the construction section by pushing and pulling a cam with the hydraulic device 15.
[0014]
A pipe for feeding a liquid chemical such as a solidifying agent is provided in the reaction force receiver 8 so that the liquid liquid can be supplied to the horizontal screw rod 6 via a lower swivel and discharged into the ground. Has become. (Not shown)
[0015]
An excavating head 9 connected to the screw rod 5 is provided below the horizontal screw rods 6, 6 '. The excavating head 9 has a role of excavating the vertical projection plane of the reaction force receiver 8 and the gear box 10.
[0016]
Next, the operation of the above embodiment will be described. The horizontal screw rod 6 is set in parallel with the excavation direction by the rotation device 7, the construction machine body 1 is set at a predetermined position, the upper rotation drive device 3 is activated, and the screw is moved along the leader 2 while performing the rotation excavation. The rod 5 and the horizontal screw rods 6, 6 'are implanted to the set depth. At this time, the excavation blade 16 attached to the outer peripheral edge of the screw blade 12 excavates the ground by the rotation of the screw rods 5, 6, 6 'and the forward force of the crawler 11, and the excavated earth and sand is removed by the rotating screw blade 12 Is transported along the ground.
[0017]
Here, while rotating the horizontal screw rods 6, 6 ', the cam is pushed by the hydraulic device 15 to rotate the rotating device 7 by 90 degrees so that the cross section perpendicular to the excavation direction becomes an inverted T-shape.
[0018]
Next, a ground improvement chemical such as cement milk is fed from a solidification material plant on the ground via a chemical supply pipe (not shown) in the reaction force receiver 8 and discharged from a chemical discharge port (not shown) while the crawler 11 is discharged. Digging forward toward the destination. Since the excess mixed soil generated at this time is discharged to the ground along the screw blade 12 of the screw rod 5, the excess mixed soil is collected in the plant, and the ground improvement chemicals and the like in the excess mixed soil are collected and used. The direction of the screw blades 12 of the horizontal screw rods 6, 6 'is set in a direction in which surplus mixed soil (including excavated earth and sand) moves to the screw rod 5, which is the central axis, according to the rotation, and is discharged to the ground. .
[0019]
Then, when the screw rod 5 reaches the destination, the supply of the chemical solution is stopped, and the horizontal screw rods 6, 6 'are turned 90 degrees by pulling back the cam of the turning device 7 with the hydraulic device 15, and excavation is performed. After returning to the direction parallel to the direction, it is withdrawn along the leader 2 and collected on the ground. At this time, the crawler 11 is retracted to the starting side, the horizontal screw rods 6, 6 'are rotated 90 degrees by the rotation device 7 to return in parallel with the excavation direction, and then withdrawn along the leader 2 and collected on the ground. However, the construction part can be pulled up in a well-balanced manner without requiring new excavation on the upper surface of the horizontal screw rods 6, 6 '. In this way, a soil cement continuous wall having a desired excavation section in an inverted T-shape is formed.
[0020]
Although the method of forming the inverted T-shaped continuous wall has been described here, it goes without saying that the L-shaped continuous wall can be formed by performing the same operation as described above with the horizontal screw rods 6, 6 'only on one side. No.
[0021]
【The invention's effect】
As described above, according to the construction machine of the present invention, it is possible to construct a continuous wall having an inverted T-shaped or L-shaped cross section perpendicular to the excavation direction without performing excavation of the ground, and the shape and design conditions of the construction site In addition to the construction, the cost can be reduced and the construction period can be shortened.
[Brief description of the drawings]
FIG. 1 is a schematic view of an inverted T-shaped continuous wall construction machine according to the present invention (FIG. 1-1 is a side view, FIG. 1-2 is a front view thereof, and FIG. FIG. 2 is a cross-sectional view from each arrow).
FIG. 2 is a cross-sectional view of the vicinity of a gear box 10 in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Construction machine main body 2 Leader 3 Rotation drive device 4 Elevating device 5 Screw rod 6 Horizontal screw rod 7 Rotating device 8 Reaction force receiving 9 Excavation head 10 Gab box 11 Crawler 12 Screw blade 13 Bevel gear 14 Sprocket 15 Hydraulic device 16 Drilling blade

Claims (3)

In a construction machine that excavates a trench in the ground and supplies solidified material, mixes and mixes excavated soil and solidified material to construct an underground continuous wall, a rotary drive device is installed on the top of the self-propelled construction machine body In addition, a screw rod with a digging blade that is driven to rotate is connected, and a horizontal screw rod with a digging blade that uses the rotation of the screw rod with a digging blade as a power source is provided at the lower end thereof. Construction machine for inverted T-shaped and L-shaped continuous walls. 2. The construction machine according to claim 1, wherein a rotation function of a construction part is added to the drive part. 3. The construction machine according to claim 1, further comprising a reaction force receiver for the rotary screw screw rod with an excavating blade, wherein the excavation direction underground cross section has an inverted T-shaped or L-shaped continuous wall. 4.

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