JPH0542151Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-shaft kneading auger machine equipped with a plurality of rotary shafts each having a digging blade used for constructing a continuous wall underground.

[Conventional technology] A hole is drilled in the ground in the shape of a wall, a mixed liquid such as cement is discharged from the tip of a rotating shaft, and mixed with in-situ soil in the soil to create a continuous wall, which is used for underground construction and civil engineering. The in-situ soil mixing method for forming earth retaining walls in construction works, water-stop walls in sheet pile earth retaining works, etc., has been effectively and widely used in construction.

1 and 2 are drawings showing an embodiment of the present application, of which known parts will be explained in order to better understand the invention of the present application.

In the figure, a drive device 3 is attached to a guide post 2 erected on a self-propelled cart 1 so as to be movable up and down. A multi-axis device 4 is connected to the lower part of the drive device 3, and this multi-axis device 4 has a plurality of (three in the illustrated example) rotating shafts 5A, 5B, and 5C (hereinafter referred to collectively as 5). ) are mounted so as to rotate in mutually opposing directions, and are connected by connecting devices 9, 9 which also serve as bearings.

A digging blade 6 is provided at the lower end of these rotary shafts 5, and a screw-shaped moving blade 7 and a rod-shaped kneading blade 8 having the same diameter as the digging blade 6 are provided above the digging blade 6, and adjacent The tips of the kneading blades 8 cooperate with each other to mix the in-situ soil and the mixed liquid to form a continuous wall unit. If necessary, H-beams or sheet piles are installed in the continuous walls to improve earth retention and water-stopping properties.

[Problem to be solved by the invention] In the above conventional multi-shaft kneading auger machine, the fifth
As shown in the figure, the rotating surface A ₁ to A ₃ of the excavating blade 6
are overlapped with each other, and the shaded part B
remained unexcavated. It is desirable that this portion B be as small as possible. Therefore, the distance between the rotating shafts 5 cannot be increased beyond a certain limit, and therefore the excavation capacity is restricted to the above limit.

In addition, as shown by the chain line on the continuous wall, H-shaped steel H ₁
Alternatively, when reinforcing _H2 , it is necessary to do so on the axis of the rotating shaft 5 as shown in the figure, which is a constraint.

The object of the present invention is to provide a multi-shaft kneading auger machine that has improved excavation capacity and is free from restrictions on the standing position of H-section steel.

[Means for Solving the Problems] According to the present invention, in a multi-shaft kneading auger machine equipped with a plurality of rotary shafts each having a digging blade used for creating a continuous wall underground, a portion of the rotary shaft is A scraping device is provided, and the scraping device includes a support member installed horizontally on a part of the rotating shaft, and is supported by the support member so as to be movable up and down by a rod, and is arranged on a common tangent to the rotating surface of the excavating blade. a flat blade whose outer side is substantially located at the outer side thereof, a connecting member which connects the flat blade horizontally and has rollers at both ends, and a connecting member formed on the lower side of the disk provided on the rotating shaft and which engages with the roller. It is comprised of a cam that moves the flat blade downward, and a return spring provided on the support member so as to move the rod upward.

[Description of effects] Therefore, as the rotating shaft rotates, when the cam formed on the lower side of the disk engages with the roller, the roller is pressed downward and moves the flat blade downward via the connecting member. Then, cut the part of the common tangent line that could not be cut with the excavator blade. When the roller passes the convex portion of the cam, the flat blade moves upward via the rod due to the action of the return spring. This operation is then repeated.

Therefore, when the flat blade collides with hard ground, cobblestones, etc., according to the prior art, the cutting had to be done by the auger's own weight, which easily caused the hole to bend. However, in the present invention, since the flat blade moves up and down, it is possible to cut even hard ground and form a correct vertical hole.

[Examples] Examples of the present invention will be described below with reference to the drawings.

1 and 2, the area above the excavation blade 6 of the rotating shaft 5 (in the illustrated example, the lower coupling device 9
(immediately above) is provided a scraping device, generally designated by the reference numeral 10.

The scraping device 10 will be explained with reference to FIGS. 3 and 4. The scraping device 10 is provided with drive shafts 5a, 5c on both sides and a support shaft 5b in the center, whose upper and lower ends are respectively connected to rotating shafts 5A, 5C, and 5B via joints (not shown).
It is connected to the excavating blades 6, 6 and the portion of 6. These shafts 5a to 5c are provided with support brackets, which are support members and are generally designated by the reference numeral 11, above and below. This support member 11 has each shaft 5a,
5b and 5c are rotatably mounted, but are not moved in the axial direction. Four boss portions 12 are formed in the center portion between the shafts on both sides of the support bracket 11. A rod 13 is inserted through these upper and lower boss portions 12, 12, and the lower end of the rod 13 is connected to the rotating surface A1 or the rotary surface _A1 of the excavating blade 6.
A scraping flat blade 14 whose outer side is located on the common axis C (FIG. 5) of A ₃ is integrally formed. These flat blades 14, 14 are connected to a beam 15 which is a connecting member.
and the drive shaft 5a of the beam 15,
5c, there are rollers 1 on each side of the axis.
6 and 16 are provided to protrude inward.

On the other hand, disks 17, 17 are protruded above the beams 15 of the drive shafts 5a, 5c, respectively, and cams 18, 18 that engage with the rollers 16 are protruded from the disks 17 to face each other. . In addition,
Reference numeral 19 in the figure is a return spring interposed between the rod 13 and the upper support bracket 11.

Therefore, the drive shaft 5 is connected via the rotating shafts 5A and 5C.
When a and 5c rotate, the cams 18 to 18 rotate the flat blades 14 to 1 via the rollers 16 to 16 and the beam 15.
4 is pushed down, and the cams 18 to 18 move to the rollers 16 to 1.
6, the return springs 19 to 19 pull up the flat blades 14 to 14, thereby causing the flat blades 14 to
-14 are designed to move up and down to scrape off the ground in part B.

[Effects of the invention] As described above, according to the invention, the flat blade is moved up and down as the rotating shaft rotates to cut the portion between the excavating blade rotating surface and the common tangent to the rotating surface. ,
Even if the flat blade comes into contact with hard rocks or cobblestones, it can be excavated by the vertical movement of the flat blade, and the hole does not bend like in the conventional case.

Therefore, vertical holes can be dug regardless of ground conditions.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention;
FIG. 3 is a front view of the rotating shaft, FIG. 3 is a front view of the scraping device, FIG. 4 is a side view of FIG. 3, and FIG. 5 is a top view showing the excavation range. C... Common tangent of the drilling blade rotating surface, 5A, 5B,
5C... Rotating shaft, 5a, 5c... Drive shaft, 5b...
...Support shaft, 6...Drilling blade, 11...Support bracket, 13...Rod, 14...Flat blade, 15...Beam, 16...Roller, 17...Disk, 18
……cam.

Claims (1)

[Scope of utility model registration request] In a multi-shaft kneading auger machine equipped with a plurality of rotating shafts having excavation blades used to create a continuous wall underground, a scraping device is provided on a part of the rotating shaft, and the scraping device a support member installed horizontally on a part of the support member; a flat blade supported by the support member so as to be movable up and down by a rod, the outer side of which is approximately located on a common tangent to the rotating surface of the excavating blade; a connecting member that is connected to the rod and has rollers at both ends; a cam that is formed on the underside of the disk provided on the rotating shaft and engages with the roller to move the flat blade downward; and a cam that moves the rod upward. A multi-shaft kneading auger machine comprising a return spring provided on the support member so as to allow the multi-shaft kneading auger to move.