JPH0565653B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a thin-wall underground excavator, and is particularly suitable for continuously constructing excavation holes for impermeable walls of a certain depth underground. Regarding excavators.

[Conventional technology]

A conventional excavator of this type will be explained with reference to FIGS. 5 and 6.

As shown in Fig. 5, the conventional excavator has two casings 2 arranged side by side, disk cutters 4 protruding from both sides of the body, and the disk surfaces thereof are arranged in the same plane, and excavation is carried out between them. A soil discharge device 6 (reverse bit in the figure) was provided, and a wing-shaped cutter 8 was provided at the lower end of the casing 2. Then, the wing-shaped cutter 8 is rotated to lower the casing 2 into the ground, and the two disk cutters 4 are lowered into the ground.
The excavated layer 10 was collected in the center by rotating in a counter-rotating manner, and the excavated layer 10 was discharged to the ground by a discharge device 6.

FIG. 6 schematically shows a longitudinal section of a conventional casing 2. As shown in FIG. In FIG. 6, a thin, large-diameter disk cutter 4 protrudes from a slit 12 provided in the casing 2, and its rotating shaft 14 is supported horizontally within the casing 2.
6 and is driven by a motor 18.

And at the lower end of casing 2, casing 2
A wing-shaped cutter 8 having a larger diameter is provided, and the casing 2 is lowered into the ground by rotating the wing-shaped cutter 8 while injecting water for removing excavated debris from an injection port 20.

[Problem to be solved by the invention]

However, in the conventional device, a wing-shaped cutter is provided further below the lower end of the disc cutter, and this wing-shaped cutter is separated from the central reverse bit suction port in both the horizontal and vertical directions. The excavated waste had to be pumped separately to the excavation section, liquefy the excavated layer, and then transported to the central reverse bit suction port.

For this purpose, a separate water pump is required, and the device becomes long due to the wing-shaped cutter. Furthermore, the wing-shaped cutter has no choice but to excavate more than the necessary excavation. In addition,
This wing-shaped cutlet has a weak stone crushing effect, and
There were problems such as difficulty in excavating bedrock.

The purpose of this invention was to solve the above-mentioned problems, and to provide an excavator that can prevent the negative effects of unnecessary excavation and water supply, and that can perform construction with high precision and efficiency with a simple device. It is to provide.

[Means to solve the problem]

In order to achieve the above object, the present invention has two vertical cylindrical casings arranged side by side, a rotation shaft supported horizontally in the body of the casing, and two rotating shafts protruding from both sides of the body. In a thin-walled underground excavator, the machine has a plurality of disc cutters, the respective disc faces of the disc cutters are arranged in substantially the same plane, and an excavated soil discharge device is provided in between. The lower end of the disc cutter is made to protrude, and a plurality of small-diameter cone cutters are provided at the lower end of the casing, and the cone surfaces of the small-diameter corn cutters are arranged so as to face both sides of the lower end of the disc cutter and to be inclined symmetrically. , the lower end of the small diameter cone cutter is located near the lower end of the disc cutter.

[Effect]

According to the above configuration, the excavated waste produced by the small-diameter cone cutter for lowering the casing into the ground can be transported to, for example, the central reverse bit device by the rotation of the disk cutter. becomes unnecessary. Furthermore, by symmetrically tilting the small-diameter cone cutter, the width of the excavation tip can be narrowed, so that a thinner excavation hole with a smaller amount of excavated soil can be formed.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a front view of this embodiment, in which two vertical cylindrical casings 30 are arranged side by side, and a rotating shaft is supported horizontally in the body of the casings 30, and each protrudes from both sides of the body. The excavated soil discharge device 34 (in this embodiment, a wet reverse bit type 36 and a dry type reverse bit type 36 and a dry type This is a thin-walled underground excavator equipped with a bucket type 38. The lower end portion of the disk cutter 32 protrudes from the lower end portion of each casing 30, and a small diameter cone cutter 40 is provided at the lower end portion of the casing 30. This excavator is lowered into the ground, and as shown in FIG.
This is the construction work.

FIG. 3 schematically shows the main parts of this embodiment, in which the cone surfaces of a pair of small-diameter cone cutters 40 are arranged to face both sides of the lower end of the disk cutter 32 and are symmetrically inclined. Its lower end 40A is located near the lower end 32A of the disk cutter 32, and its upper end 40B is located outside the outer diameter of the casing 30. That is, the rotating shaft 40C of the small-diameter cone cutter 40 is slightly inclined with respect to the rotating shaft 32B of the disk cutter 32.

By doing this, the cutting waste produced by the small-diameter cone cutter 40 is transported by the rotation of the disk cutter 32. As shown in the figure, if the lower end of the disc cutter is placed below the lower end 40A of the small diameter cone cutter, the efficiency of excavating gravel, rock, etc. is improved, but the lower end 40A of the small diameter cone cutter may be placed lower. Connect the lower end 40A of the small diameter cone cutter to the lower end 32A of the disk cutter.
By locating it near the tip, it is possible to excavate with a thin tip, and the amount of excess excavated soil is also reduced.

FIG. 4 is a schematic diagram for explaining the operation of this embodiment.
Equipped with:

According to this example, the excavated waste 46 produced by the small-diameter cone cutter 40 can be transported toward the suction port 44A of the central reverse bit 44 by the two counter-rotating disc cutters 32 even if it is not liquefied by water supply. I can do it. Further, for this purpose, a dry bucket-type soil discharge device can be used as the central excavated soil discharge device instead of a reverse bit.

By using this embodiment, the following excellent effects can be obtained.

(a) The two small-diameter cone cutters provided at the lower end of the disk cutter carry the excavated waste by the disk cutter running nearby, and are easily transported to the reverse slot together with the excavated waste from the disk cutter. In other words, the water pump required in the conventional method is no longer necessary.

(b) The width of the disc cutter can be made narrower by slightly tilting the small diameter cone cutter shaft with respect to the disc cutter shaft. This results in thinner holes with less excavated soil.

(c) In the conventional mechanism, a wing-shaped cutter was required under the disk cutter, which made the entire device longer. However, with this system, the lower end of the disk cutter becomes the lower end of the device, making it possible to shorten the length of the machine. be able to.

(d) Although it was difficult to excavate and discharge gravel using wing-shaped cutters and water conveyance, small-diameter cone cutters are effective in this respect as well, making it possible to excavate and remove even larger-diameter gravel.

(E) Furthermore, if a submersible pump is mounted on the upper part of the excavated soil discharge device in the center, a suction pump is not required, and excavated debris can be removed efficiently.

(f) In addition, if the central reverse bit is replaced with a bucket type cutter, so-called dry excavation can be performed without the need to remove excavation debris using muddy water.

〔Effect of the invention〕

As described above, according to the present invention, by tilting a pair of small-diameter cone cutters and narrowing the interval between their lower ends so that they are close to the lower end of the disk cutter, adverse effects such as liquefaction due to unnecessary excavation and water supply are avoided. The equipment is simplified, such as eliminating the need for a water pump, and the stone crushing efficiency is improved, allowing for dry earth removal, allowing for efficient construction.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
3 is a schematic vertical cross-sectional view of the casing of this embodiment, FIG. 4 is a schematic front view of this embodiment, and FIG. 5 is a front view of the conventional example.
FIG. 6 is a schematic vertical cross-sectional view of a conventional casing. 30...Casing, 32...Disk cutter, 34...Excavation soil discharge device, 40...Small diameter cone cutter.

Claims (1)

[Scope of Claims] 1. Two vertical cylindrical casings are arranged side by side, and two disc cutters that rotate with their rotating shafts supported horizontally within the bodies of the casings and protrude from both sides of the bodies are provided. In a thin-walled underground excavator, the disk surfaces of the disk cutters are arranged substantially in the same plane and an excavated soil discharge device is provided in the middle thereof, from the lower end of each of the casings to the lower end of the disk cutter. a plurality of small-diameter cone cutters are provided at the lower end of the casing, and the cone surfaces of the small-diameter cone cutters are arranged to face both sides of the lower end of the disk cutter and are symmetrically inclined; A thin-walled underground excavator, wherein the lower end is located near the lower end of the disc cutter.