JPH086313B2 - Ground improvement machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement machine for stirring and mixing ground with powder of solidifying material or milk.

[0002]

2. Description of the Related Art Generally, ground improvement machines are used to form a foundation ground such as a ground surface. The ground improvement machine is integrally provided with an excavating device for descending into the ground to improve the ground, and a powder fluid pumping pipe for discharging powder of the solidifying material or milk into the ground.

[0003]

By the way, since the discharge port of the powder fluid pressure feeding pipe is formed to have a diameter substantially the same as the diameter of the powder fluid pressure feeding pipe, the powder of the solidifying material discharged into the ground is formed. The body or milk is not widely diffused from the discharge port, so that the ground to be agitated and mixed and the powder or milk of the solidifying material are not uniformly mixed, and the object of improving the ground cannot be sufficiently achieved. was there. Further, when the powder of the solidifying material is discharged, there is a problem that since the ground has a large amount of water, the cement is solidified at the discharge port and the discharge port is easily clogged, and the role of the powder fluid pumping pipe cannot be sufficiently achieved. there were. Therefore, the present invention provides a ground improvement machine having a powder / powder pressure-feeding pipe capable of uniformly mixing the powder or milk of the solidifying material with the ground and further preventing the powder of the solidifying material from being clogged at the discharge port. The purpose is to

[0004]

In order to achieve the above object, the ground improvement machine of the present invention has a drilling device that descends into the ground and stirs and mixes the ground with powder of solidifying material or milk into the ground. In a ground improvement machine integrally provided with a powder fluid pressure-feeding pipe for discharging, a tip discharge part of the powder fluid pressure-feeding pipe is formed in a V shape that gradually expands toward a discharge port, and is formed between the inner surfaces of the tip discharge part facing each other. A plurality of separation rods are laid horizontally with a certain gap. Further, a tip ejection portion of the highly compressed air ejection tube is provided in the vicinity of the tip ejection portion of the powder fluid pumping pipe, and the direction of the ejection port is made substantially the same as the ejection port of the tip ejection portion. is there.

[0005]

The powder or milk of the solidifying material, which is pressure-fed in the powder-fluid pressure-feeding pipe, spreads at the tip discharge portion, and is dispersed by the respective separating rods and discharged from the discharge port to the ground widely and uniformly. In addition, the highly compressed air is ejected from the ejection port of the highly compressed air ejection pipe in a direction substantially the same as the direction of the ejection port, and a cavity is formed in the vicinity of the ejection port of the tip ejection unit, so that the soil is ejected to the ejection port. Is less likely to adhere. With this, particularly when the powder of cement is discharged, the moisture around the discharge port and the cement react with each other and solidify, and the discharge port is not clogged.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the ground improvement machine according to the present invention will be described below with reference to the drawings. FIG. 1 shows a ground improvement machine for stirring and mixing the ground while excavating the ground. The ground improvement machine is provided with a movable arm 2 extending from a backhoe 1 which is capable of self-propelling, and an excavating device 3 attached to the tip of the arm 2 for descending into the ground and stirring and mixing the ground. .

As shown in FIGS. 2 and 3, the excavation device 3 is
A gate-shaped machine frame 4 is fixed to the tip of the arm 2,
A drive shaft 5 is mounted above the side plates 4a and 4b. A drive motor 6 is attached to the outer surface of the one side plate 4a to drive the drive shaft 5 to rotate. Further, the drive shaft 5 is provided with a pair of drive sprockets 7, 7. A pair of upper and lower horizontal frames 8 and 8 are horizontally installed in a lower portion between the side plates 4a and 4b. From the horizontal frames 8 and 8, the pair of support frames 9 and 8 are located at positions corresponding to the pair of drive sprockets 7 and 7, respectively. 9 hangs down. The driven sprockets 10, 10 are axially mounted on the lower ends of the support frames 9, 9.

Reference numerals 11 and 11 denote chains endlessly stretched between the pair of drive sprockets 7 and driven sprockets 10 and 10. The ground is excavated on the outer peripheral surfaces of the chains 11 and 11. Stirring blades 12, 12 for stirring and mixing ...
Are arranged in multiple rows. In addition, 13, 13, 13, 13
Is an auxiliary sprocket for tensioning the chains 11, 11.

Reference numeral 14 designates a powder fluid pumping pipe which is integrally provided along the excavation device 3 for pumping powder or milk of a solidifying material such as cement or lime and discharging it into the ground. , 15 are highly-compressed air ejection pipes for ejecting highly-compressed air. Both of these are L on the tip side.
The horizontal portions 14a and 15a are formed in a V shape and are fixed to one side of the pair of support frames 9 and 9. Further, a tip discharge portion 16 is provided at the tip of the horizontal portion 14a of the powder fluid pumping pipe 14. As shown in FIGS. 4 and 5, the tip end discharge portion 16 is formed in a V shape that gradually widens toward the discharge port 17.
A plurality of circular frame-shaped separation rods 18, 18 ... Are horizontally provided with a certain gap S between the facing inner surfaces of the tip discharge port 17.

Further, as shown in FIG. 6, the tip end ejection portion 19 of the highly compressed air ejection pipe 15 is provided in the vicinity of the tip end ejection portion 16, and its ejection port 20 is substantially the same as the ejection port 17. It has the same width and is formed in a flat shape. And
The direction is almost the same as that of the discharge port 17. The highly compressed air jet pipe 15 is used especially when the powder of the solidifying material is discharged by the powder fluid pressure feed pipe 14 as described later.

The present invention has the above-mentioned structure, and the operation will be described below. The chains 11, 11 are rotated to lower the excavation device 3 into the ground, and the ground is agitated and mixed while the powder or milk of the solidifying material is discharged from the powder fluid pressure feeding pipe 14. The powder or milk spreads in the tip discharge part 16 as shown in FIG.
Are dispersed by the nozzles 8, 18, ..., Pass through the gaps S between the separating rods 18, 18 ,. As a result, the ground and the powder of the solidifying material or milk are well mixed and become uniform.

When the powder of the solidifying material is discharged by the powder fluid pressure feeding pipe 14, the jet port 20 of the highly compressed air jet pipe 15 is used.
Highly compressed air should be jetted from at the same time. As a result, since the soil around the discharge port 17 of the powder fluid pumping pipe 14 is removed to form a cavity, the soil is less likely to adhere to the discharge port 17, and the solidified material solidifies by reacting with water around the discharge port 17. Will not do. Therefore, the discharge port 17 is not clogged, and the powder of the solidifying material can always be discharged normally.

[0013]

As described above, according to the ground improvement machine of the present invention, the tip discharge portion of the powder fluid pumping pipe is formed in the shape of a V that gradually expands toward the discharge port, and the tip discharge portion of the tip discharge portion is formed. Since a plurality of separation rods are laid horizontally with a certain gap between the facing inner surfaces, the powder or milk of the solidifying material can be widely and evenly discharged into the ground. Milk and the ground are evenly mixed, and the ground can be improved efficiently. Further, since the high-compression air jet pipe is installed in parallel with the powder fluid pumping pipe, even when discharging the powder of the solidifying material
The powder adheres around the discharge port and solidifies, and the discharge port is not clogged, and the discharge can be performed normally.

[Brief description of drawings]

FIG. 1 is a perspective view of a ground improvement machine of the present invention.

FIG. 2 is a front view of the excavation device.

FIG. 3 is a side view of the same.

FIG. 4 is an enlarged side view of a main part.

FIG. 5 is a sectional view of the same plane.

FIG. 6 is a front view of the same.

[Explanation of symbols]

 1 Ground Improvement Machine 3 Excavation Device 14 Powder Fluid Pumping Pipe 15 High Compressed Air Jet Pipe 16 Tip Discharge Portion 17 Discharge Port S Gap 18 Separation Rod 19 Tip Jet Portion 20 Jet Port

Claims (2)

[Claims] 1. A ground improvement machine in which a powder fluid pumping pipe for discharging powder or milk of a solidifying material into the ground is integrally provided in an excavating device that descends into the ground and stirs and mixes the ground. The tip discharge part of the pressure feed pipe is formed in a V shape that gradually expands toward the discharge port, and a plurality of separation rods are horizontally arranged with a certain gap between the inner surfaces facing each other of the tip discharge part. A ground improvement machine. 2. A tip ejection portion of a highly compressed air ejection tube is provided in the vicinity of the tip ejection portion of the powder fluid pumping pipe, and the direction of the ejection port is substantially the same as the ejection port of the tip ejection portion. The ground improvement machine according to claim 1, which is characterized in that.