JPH10219672A - Excavating agitating blade of ground improving excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To length a length of excavating agitating blades house in a housing body having a limited length, and produce an improved body having a large diameter by housing tip parts of the excavating agitating blades of an upper stage in a lapping shape on the outside of an opening-closing fulcrum of the excavating agitating blades of a lower stage. SOLUTION: Excavating agitating blades 11 to 14 are installed on an agitating shaft 2 of a ground improving excavator so as to be simultaneously freely openable and closable by 90 deg. with support shafts 18 as an opening-closing fulcrum. The excavating agitating blades 11 and 13 of a lower stage part and the excavating agitating blades 12 and 14 of an upper stage part are installed in a step difference shape on the agitating shaft 2, and tip parts of the excavating agitating blades 4 and 12 of an upper stage can also be housed in a lapping shape at the opening-closing fulcrum of the excavating agitating blades 13 and 11 of a lower stage, that is, on the outside of the respective support shafts 18. Therefore, a length of the excavating agitating blades 11 to 14 housed in a housing part H having a limited length can be lengthened, and a diameter D of an improved body to be created can be formed as a large diameter, and ground improving efficiency can be improved. A blade end part S' and a blade side end parts S of the excavating agitating blades 11 to 14 are formed in a sawtooth shape, and rotary excavation is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement excavation in which ground is improved by injecting grout such as a cement solidifying agent for ground improvement into a ground requiring improvement while stirring and mixing to form an improved body. Related to the drilling and stirring blades of the machine.

[0002]

2. Description of the Related Art Conventionally, the ground has been improved by constructing an improved body by stirring and mixing while pouring a ground improving material such as a cement-based solidifying agent into a ground area requiring improvement. However, depending on the ground, there is an improved ground area that requires ground improvement depending on its depth, and a relatively good improvement-free ground area that does not require ground improvement.
When the ground improvement is performed using a ground improvement machine with fixed stirring blades, an improved body will be created even in a relatively good and unnecessary ground area where the ground improvement is not necessary, and the ground improvement material and power cost etc. It is bulky and very uneconomical.

[0003] Therefore, in accordance with the unrequired ground area in the depth direction of the ground and the ground area requiring improvement, the excavating and stirring blades provided in multiple stages on the stirring shaft can be freely opened and closed to agitate and mix the ground area requiring improvement. Only when excavating agitating blades are open, grout for ground improvement such as cement solidifying agent is discharged to the ground,
Improvement of the ground area requiring improvement has been performed by mixing the grout with earth and sand in the ground and stirring the mixture.

In this case, the excavating and stirring blades provided on the stirring shaft in a multi-stage and openable and closable manner need to be compactly stored in a storage portion in a limited length direction of the stirring shaft.
It is necessary to make the length of the excavating stirring blade as long as possible in order to construct an improved body having a large diameter. Also,
The excavating agitating blade is a kind of consumable because it agitates the ground in the ground area requiring improvement.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a ground improvement excavator in which a multi-stage excavation agitating blade accommodated in a storage portion of a limited length excavating agitating blade has a length as long as possible. In addition, it is possible to create an improved body with a large diameter, and at the time of excavation of the ground where no improvement is required, the excavation agitating blades play the role of a pilot, so that the excavation resistance is reduced and the consumption of the excavation shaft is reduced. Provide a drilling stirring blade.

[0006]

In other words, the excavating and stirring blades of the ground improvement excavator of the present invention have multiple stages of excavating and stirring blades on a stirring shaft for stirring while injecting grout for ground improvement into soft ground. With the excavating and stirring blades of the ground improvement excavator that is freely openable and closable, the tip of the upper excavating and stirring blade is wrapped outside the opening and closing fulcrum of the lower excavating and stirring blade so that it can be stored. It is composed of

Further, in the excavating and stirring blade of the present invention, a blade end and a blade side end which come into contact with the ground when the excavating and stirring blade of the ground improvement excavator rotates are formed in a saw-tooth shape.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The ground improvement excavator shown in FIGS. 1 and 2 is a single-shaft type, and the stirring shaft 2 is provided with excavating and stirring blades 11 and 12 on one side of a flat portion 2a, and excavating and stirring on the other side. The wings 13 and 14 are provided.

These excavating and stirring blades 11, 12, 13, 1
As shown in FIGS. 1 and 2, as shown in FIGS. 1 and 2, the lower and upper flat portions of the stirring shaft 2 are provided in multiple stages. Similarly, the excavating and stirring blades 12 and 14 in the upper stage are also mounted on the stirring shaft 2 at different levels. As shown in FIGS. 3 and 4, these excavating and stirring blades 11 to 14 are provided to be freely openable and closable by 90 ° with respect to the stirring shaft 2 using the support shaft 18 as an opening and closing fulcrum. Drilling stirring blades 11 to 14 are usually
As shown by the solid line in FIG. 3, it is housed in the flat part of the stirring shaft 2 in a closed state, but in the ground requiring improvement, as shown by a two-dot chain line, it rotates together with the stirring shaft 2 in an open state and grout piping The grout sent through 33 is stirred into the ground through the discharge port 40 while being injected to form an improved body.

The opening and closing of the excavating agitating blades 11 to 14 with respect to the agitating shaft 2 is performed by driving a fluid cylinder (not shown) built in the agitating shaft 2 by levers 19 mounted on each support shaft 18.
, And at that time, the excavating and stirring blades 11 to 14 are simultaneously operated. In the closed state of the excavating and stirring blades 11 to 14 arranged in multiple stages, as shown in FIG.
, That is, wrapped around the outside of each support shaft 18 so as to be housed.

As described above, by forming the shapes of the excavating and stirring blades 11 to 14 so as to wrap up and down, FIG.
As in this embodiment, the excavating and stirring blades 11 to 14 are stored in two or more stages in a storage portion H of a limited length provided in the flat portion 2a on the side of the stirring shaft 2 of FIG. Can be as long as possible. As a result, the diameter D of the improved body to be formed can be increased, and the efficiency of ground improvement can be improved.

Further, in the present invention, each of the excavating and stirring blades 11 to 1 is provided.
Wing tip S 'and wing-side tip S which come into contact with the ground when rotating
Are formed in a saw-tooth shape, and not only function as a pilot when the excavating shaft 2 is rotated and excavated, but also have a function of preventing wear of the excavator body. In addition, as shown in FIGS. 1 and 2, this ground improvement excavator is provided with a drill bit 31 and a discharge port 30 for discharging grout at a lower end, and a relatively good improvement that does not require ground improvement is required. In the ground area, excavation is performed only by excavation by the excavation bit 31 and discharge of grout from the discharge port 30 in a state where the excavation stirring blades 11 to 14 are closed, and an improved body having a small diameter is formed.

In the above description, a case where the present invention is applied to a single-shaft type excavator has been described, but the present invention can also be applied to a twin-shaft type excavator.

[0014]

As described above, according to the present invention, the length of the excavating and stirring blade accommodated in the accommodating portion of the limited length excavating and stirring blade provided on the flat portion on the side surface of the stirring shaft is increased. it can. Therefore, it is possible to create an improved body having a larger diameter, and it is possible to improve the efficiency of the ground improvement work.

Further, according to the present invention, since the wing tip and the wing-side tip which come into contact with the ground when the excavating stirring blade rotates are formed in a saw-tooth shape, the excavation resistance is reduced while excavating the unnecessary improvement portion, and the excavation is simultaneously performed. Since it plays a role of a pilot at the time, the consumption of the drilling shaft can be reduced, and the life of the drilling shaft can be maintained long.

[Brief description of the drawings]

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

FIG. 2 is a side view of the ground improvement excavator according to the present invention.

FIG. 3 is an enlarged side view of a main part of the ground improvement excavator according to the present invention.

FIG. 4 is a cross-sectional view of the ground improvement excavator according to the present invention.

[Explanation of symbols]

 2 Stirring shaft 11 Drilling stirring blade 12 Drilling stirring blade 13 Drilling stirring blade 14 Drilling stirring blade S, S 'Serrated

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshio Watanabe 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Taichi Kusakari 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Kazuyoshi Uemura 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation Shimizu Corporation (72) Inventor Junnori Kitagawa 5-6-1, Tsukiji, Chuo-ku, Tokyo Mitsui Engineering & Shipbuilding Co., Ltd. (72) Inventor Masaru Nakamura 5-6-4 Tsukiji, Chuo-ku, Tokyo Mitsui Engineering & Shipbuilding Co., Ltd. (72) Inventor Nobuo Iida 15-17 Sakuragaokacho, Shibuya-ku, Tokyo Japan Basic Technology Co., Ltd. (72) Inventor Minaya Takeishi 15-17 Sakuragaoka-cho, Shibuya-ku, Tokyo Japan Basic Technology Co., Ltd. (72) Inventor Satoru Kawamoto 15-17 Sakuragaoka-cho, Shibuya-ku Tokyo

Claims (2)

[Claims] 1. A ground improvement excavator of a ground improvement excavator in which a plurality of excavation and stirring blades are arranged on a stirring shaft for stirring while injecting grout for ground improvement into soft ground while being openable and closable, in a closed state. The excavation and stirring blade of a ground improvement excavator in which the tip of the upper and lower excavation and stirring blade is wrapped outside the opening and closing fulcrum of the lower excavation and stirring blade so as to be stowable. 2. The excavating and stirring blade of a ground improvement excavator according to claim 1, wherein a blade end and a blade side end that come into contact with the ground when the excavating and stirring blade rotates are formed in a saw-tooth shape.