JPH033631Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a multi-axis ground improvement device.

Conventional technology and its problems A multi-shaft type has been proposed as a conventional ground improvement device. This multi-axis method increases the area to be improved per construction and improves work efficiency, but in the conventional method, each axis is essentially independent, and one drive system is required for each axis. Therefore, it had drawbacks such as heavy equipment, high price, and complicated operation.

The present invention was made with the aim of eliminating these conventional problems.

Means for Solving the Problems The present invention includes a rotary main shaft as a rotation drive system, and a plurality of rotary slave shafts for excavation agitation arranged below the main shaft as a center. The lower end of the main shaft is individually connected to the upper end of the rotating slave shaft via a rotational transmission mechanism, and the rotating slave shaft is provided with a fluid passage as a supply system for the improving agent, and the rotating slave shaft is provided with a fluid passageway as a supply system for the improving agent. is equipped with a protective box, in which the rotating slave shaft and the rotating main shaft are supported via bearings,
This invention relates to a multi-axis ground improvement device characterized in that a rotation prevention member that bites into the hard ground around the excavated ground is fixedly installed in the box.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

The multi-spindle ground improvement device according to the present invention has one rotary main shaft 2 as a rotational drive system, and a plurality of excavating and agitating shafts arranged below the main shaft 2, for example, four at 90° intervals. It includes a rotating slave shaft 1 for use.

The rotating slave shaft 1 has an excavating blade 11 at the bottom thereof, and an excavating blade 1
A stirring blade 12 is provided above the slave shaft 1, and the improving agent supplied from the upper end of the slave shaft 1 to the internal fluid passage 13 (see FIG. 1) is transferred to the slave shaft 1 and/or the stirring blade 1.
The structure is such that it can be injected into the ground after excavation from a nozzle (not shown) provided at 2. The lower end of the rotating main shaft 2 is connected to the upper end of the rotating slave shaft 1...
They are individually connected via a rotation transmission mechanism 3.

They are individually connected as a rotational transmission mechanism 3.

Although the rotational transmission mechanism 3 is shown in the figure as consisting of a bevel gear 31, various other known systems consisting of spur gears, sprockets, chains, etc. may be employed.

A protection box 4 is provided around the rotation transmission mechanism 3, and the rotation main shaft 2 and the rotation slave shafts 1 are supported by the protection box 4 via bearings 41.

A rotation preventing member 5 is attached to the protection box 4 so as to project slightly outwardly from the wings 11 and 12. Although the figure shows a case in which the rotation prevention members 5 are provided at four locations at 90° intervals, the number of rotation prevention members 5 installed is not particularly limited. A vertical blade-like portion 51 can be formed at the tip of the rotation stopper member 5 for the purpose of improving the biting into the ground.

Figure 1 shows the situation during ground improvement work using the device of the present invention. During this construction, the tip of the rotation preventing member 5 attached to the protection box 4 bites into the hard ground around the excavated ground and prevents the rotational movement of the rotating slave shaft 1 supported by the protection box 4. , the rotation of the rotating main shaft 2 is individually transmitted to the rotating slave shafts 1 . . . without any revolution movement.

When the rotating slave shaft 1 rotates (rotates), the excavating blade 11
And the part of the stirring blade 12 receives resistance from the ground,
Generates a reaction force in the direction of revolution. Therefore, the rotating slave shaft 1...
If it is not stopped, it will revolve while rotating. This revolving motion causes a decrease in the rotational speed of the rotary slave shaft 1, which makes it impossible to perform the desired excavation and stirring functions. In the present invention, such problems can be eliminated by preventing rotation of the rotating slave shafts 1 with the rotation prevention member 5.

According to the present invention, the purpose of ground improvement can be achieved by excavating the ground during the descent and injecting and mixing the improving agent into the excavated ground during the ascent.

Effects As described above, the device of the present invention has a single drive system even though it has a multi-axis configuration, so it has the advantages of being light and inexpensive, as well as being easy to operate. can get.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention and its construction situation, and FIG. 2 is a plan view of FIG. 1. In the figure, 1 is a rotation slave shaft, 2 is a rotation main shaft, 3 is a rotation transmission mechanism, 4 is a protection box, and 5 is a rotation preventing member.

Claims (1)

[Scope of utility model registration request] It includes one rotating main shaft as a rotational drive system and a plurality of rotating slave shafts for excavation and agitation arranged below around the main shaft, and the lower end of the rotating main shaft is the upper end of the rotating subordinate shaft. are individually connected via a rotation transmission mechanism, the rotation slave shaft is provided with a fluid passage as a supply system for the improving agent, and a protection box is provided around the rotation transmission mechanism,
The rotating slave shaft and the rotating main shaft are supported by the box via bearings, and a rotation preventing member that bites into the hard ground around the excavated ground is fixed to the box. Type ground improvement device.