JPH018585Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a kneading device used in a deep mixing treatment method on a soft ground improvement method.

[Prior art and problems]

In a conventional kneading device, a head 1 as shown in FIG. 1 is attached to the tip of a hollow auger shaft, and a shaft 3 is rotated and propelled while ejecting a caking agent from an opening in a bit 2 at the tip. At this time, the bit 2 cuts the ground at the tip, and the propulsion mixing blades 4 and kneading blades 5, which are kneading devices, mix earth and sand with the caking agent. It is known that grouting is continued while the grout is rotated in the opposite direction when being pulled out, completely filling the gap.

However, in the construction method using such conventional kneading equipment, the fluidized soil moves around the propulsion mixing blade and the mixing blade, or passes through the propulsion mixing blade and the mixing blade, making it difficult to ensure that the soil is finely divided. Ta.
Therefore, in this case, there were problems such as the distribution of the caking agent was not uniform and soil lumps entered the lathe after kneading, resulting in variations in strength.

[Purpose of invention]

This device was devised to solve the above-mentioned problems, and its purpose is to reliably break up soil nodules during mixing, ensure the effect of stirring and mixing with the caking agent, and The object of the present invention is to provide a kneading device capable of improving and uniformizing the processing quality.

[Structure of the idea]

According to this invention, a lattice-shaped stirring blade is installed at the lower end of the hollow auger shaft through which the soil lumps are forced to pass through by drilling holes, and this stirring blade prevents the fluidized soil lumps from migrating to the outside. This is provided with an outer casing pipe.

〔Example〕

This invention will be explained below with reference to illustrated embodiments.

The crane truck 6 includes a drive section 7 and a drive section 7.
Hollow auger shaft 8 provided at the lower end of
A kneading device 9 provided at the lower end of the hollow auger shaft 8 is attached. (Second
(See figure) The kneading device 9 includes an outer casing pipe 10 and a hollow auger shaft 8 within the outer casing pipe 10.
a stirring blade 11 attached to the upper and lower injection ports 12 and 12' for injecting the caking agent into the outer casing pipe 10, and a cutting blade attached to the hollow auger shaft 8 at the lower end of the stirring blade 11. It consists of a hole bit 16. (Refer to Figures 3 to 6) The stirring blades 11 are constructed by hollowing out a lattice plate 15 that is assembled in a lattice shape with vertical lattice blades 13 that are repeatedly inclined in opposite directions and horizontal lattice blades 14 that are inclined. It is formed by protruding from the auger shaft 8 in a cross shape.
This stirring blade 11 is connected to the outer casing pipe 10.
Welded inside.

The upper and lower injection ports 12 and 12' are attached to vertical horizontal lattice wings 14 provided at the upper and lower ends of the lattice plate 15 so as to be able to inject the solidifying agent into the outer casing pipe 10. . The caking agent sent from the hollow auger shaft 8 is
Upper and lower injection ports 1 via flow direction converter 17
2, 12'.

The drilling bit 16 protrudes in a cross shape from the hollow auger shaft 8, and is attached to the outer casing pipe 10.
Drilling cutting edge 1 that can drill an area equivalent to the lower end area of
It is formed of a 4-winged bit with a diameter of 8. A fish tail 19 is attached to the center.

When turning for soft ground improvement using a kneading device having such a configuration, first the drive section 7 is operated, and the hollow auger shaft 8 and the kneading device 9 are operated.
transmits rotational motion to. Then, the crane truck 6 is operated and the drive unit 7 is moved down along the leader 20 to start drilling with the drilling bit 16.

Next, the soil clods that have been largely crushed by the drilling bit 16 are mixed with the consolidating agent that is injected from the lower injection port 12 through the flow direction changer 17 from the hollow auger shaft 8. At this time, the soil clods are broken down into soil particles by the vertical and horizontal lattice blades 13 and 14 of the lattice plate 15 as drilling progresses, and the stirring and mixing with the caking agent is completed. At this time, the interval and angle of the grid plate 15,
Change the speed appropriately depending on the soil quality.

Next, when drilling to a predetermined depth is completed, the drive unit 7 gives reverse rotation and upward movement to the kneading device 9, and the kneading device 9 is pulled up. At this time, the caking agent is injected from the upper injection port 12 by the flow direction converter 17 and further mixed with the soil particles.

In this way, the kneading device 9 is pulled out of the drilled hole and the ground improvement is completed.

FIGS. 7 and 8 show another embodiment for use in particularly poor ground (humus-containing soil, highly viscous soil, etc.).

A donut auger 21 is used, and a lattice plate 15 that rotates in the normal direction is provided on the internal auger 21a, and a lattice plate 15 that rotates in the opposite direction is provided on the outer casing pipe 10 attached to the external auger 21b. This increases the effect of stirring and mixing, and improves turning speed and economic efficiency.

[Effect of idea]

This invention has the above configuration and has the following effects.

By rotating the stirring blades arranged in a lattice shape within the outer casing, it is possible to reliably break up the soil lumps without them moving around.

In addition, by providing injection ports at the upper and lower ends of the outer casing to inject the caking agent into the outer casing, the caking agent is reliably mixed within the outer casing during drilling and extraction. I can do it.

In this way, the soil and the caking agent can be mixed reliably and easily, and the turning quality can be improved and made more uniform.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional kneading device, Fig. 2 is a front view showing the kneading device of this invention attached to a crane truck, Fig. 3 is an enlarged view of section A in Fig. 2,
Figure 4 is a sectional view taken along line B-B in Figure 3, and Figure 5 is a cross-sectional view of Figure 3.
6 is a sectional view taken along line C-C in FIG. 3, FIG. 7 is a vertical sectional view showing the kneading device of another embodiment, and FIG. It is a sectional view taken along the line DD in FIG. 7. 1...head, 2...bit, 3...shaft, 4...propulsion mixing blade, 5...rehearsing blade, 6...
Crane vehicle, 7... Drive unit, 8... Hollow auger shaft, 9... Kneading device, 10... Outer casing, 11... Stirring blades, 12, 12'... Upper and lower injection ports, 13... Vertical Lattice blade, 14...Horizontal lattice wing, 15...Grate plate, 16...Drilling bit,
17...Flow direction converter, 18...Drilling cutting edge, 19...
...Fishitere, 20...Leader, 21...
Donut Auger, 21a... Internal Auger, 21
b...External auger.

Claims (1)

[Scope of utility model registration request] This is a kneading device installed at the lower end of the hollow auger shaft to which the vertical movement and rotation from the drive part is transmitted and the caking agent is sent. A stirring blade attached to the hollow auger shaft, a drilling bit provided at the lower end of the stirring blade and capable of drilling a hole in an area equal to the lower end area of the outer casing pipe, and a drilling bit sent from the hollow auger shaft. an injection port that injects a caking agent into the pipe from the upper end or lower end of the outer casing pipe;
A kneading device for improving soft ground, comprising a flow direction converter for switching the flow of the chemical to an upper end or a lower end.