JPH0419331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a ground improvement machine that mechanically mixes and stirs using stirring blades. This invention relates to a device for widening the stirring blades in a soil improvement machine, which performs mixing by opening the stirring blades within the necessary range, and allows the operator to visually confirm the open/closed state of the stirring blades.

In general ground improvement work, depending on the purpose, the upper layer is often left in a state close to its current state, and only the lower layer is improved.

In this case, we want to avoid obstacles that are common in the upper layer, make it easier to excavate and salvage areas that do not require improvement, and do not want to disturb areas that do not require improvement.
It is desirable to carry out this range with the blades closed, and only open the blades for the portion to be improved for mixing. In particular, if you try to leave railway sleepers and ballast under the trackbed as they are and improve the soil beneath them,
The deep mixing method requires expansion of the blades.

The present invention has been made in view of the above-mentioned circumstances.

The present invention provides a ground improvement machine that mechanically mixes and stirs soil and a soil improvement material such as a solidification material using stirring blades, which comprises: an excavation shaft consisting of a double pipe of an inner pipe and an outer pipe; an excavation head provided at the lower end; a stirring blade whose base end is pivotally attached to the lower part of the inside of the window of the excavation head; and which is housed and expanded inside and outside the window; and an inner tube whose upper end is located at the upper part of the inside of the window. The lower end comprises a link whose lower end is pivotally attached midway between the base end and the tip of the stirring blade, and which is located within the window regardless of whether the stirring blade is opened or closed, and which excavates the flow path of the inner and outer tubes. It is characterized in that it is connected to each discharge port through a separate flow path of the head.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 3 are schematic mechanical diagrams showing a stirring blade expansion device according to the present invention, and respectively show a front view, a side view, and a front view of the blades in a closed state and an open state.

In the figure, 1 is an inner pipe, 2 is an outer pipe, 3 is a link, 4 is a stirring blade, and 5 is an excavation head installed at the lower end of the outer pipe 2. The link 3 is connected to the inner pipe 1 and the stirring blade 4. The stirring blade 4 is connected by rotatable pins 6 and 7, and the base end of the stirring blade 4 is connected to the outer tube 2 and the rotatable pin 8.
It is pivoted by.

In addition, in the figure, the ground improvement machine has a head part H,
It consists of the rod R and the movement range L of the inner tube 1, and the closed blade state is performed with the outer tube 2 made of a double tube rod pushed down against the inner tube 1 as shown in Fig. 1, and the open blade state This is done by applying an external force to bring the outer tube 2 into a lifted state relative to the inner tube 1, as shown in FIG.

4 is a sectional view taken along the line AA in FIG. 2, and FIG. 5 is a sectional view taken along the line BB in FIG. When the inner tube 1 is pushed down, the stirring blades 4 are expanded outward from the window portion 5a via the link 3.

Further, the window portion 5a has an extremely small opening,
By reducing the loss of the shaft cross section in response to the shaft torque, by reducing the thickness of the link 3, and by pushing out the compaction of soil and the encroachment of gravel, etc. that occur when the blades are closed, in the opposite direction to the direction in which the blades close. , which facilitates closed-wing operation.

The link 3 is configured to be located within the window 5a regardless of whether the stirring blade is opened or closed.

Further, as shown in FIG. 4, a passage hole 9 for a soil improvement machine such as cement milk is provided at a position other than the window 5a of the excavation head 5, and a discharge port ( (not shown) is provided at an arbitrary position near the opening of the stirring blades 4.

The flow passage holes 9 are installed in two systems, an inner pipe and an outer pipe.
Two types of liquid soil improvement materials can be injected separately.

Next, the blade expansion operation of the stirring blade configured as described above will be explained.

6a to 6f are explanatory views of the operation when applying an external force to the inner tube 1 using the boring machine 10, and FIG. Part R
From this state, as shown in the closed-wing excavation state in FIG. As shown in Figure 6c,
When a predetermined excavation depth is reached, the stopper 12 and swivel 13 placed on the top of the boring machine 10 are attached to the upper end of the inner pipe 1, and as shown in FIG.
The stirring blades 4 are opened as shown in the blade opening operating state.

That is, in the open state of FIG. 6d, the rod portion R
When the outer tube 2 is pulled up while being rotated by the drill head 11, the inner tube 1 stops at the stopper 12 via the swivel 13, and as the outer tube 2 continues to be pulled up, the inner tube 1 is pushed down relatively. The stirring blades 4 are open.

When the expansion of the blades is completed in FIG. 6d, the inner pipe 1 is connected to the lower connecting portion 15 of the connecting rod 14 in order to stop the stirring blades 4 from closing due to the resistance of the soil.
As shown in the figure, a structure is adopted to suppress the increase.

Therefore, connect the required number of rods in the same manner and inject soil improvement material through the inner pipe 1 or, if necessary, through the outer pipe 2 during excavation or salvage, and apply this soil improvement material to the excavation head 5. Stirring blade 4 from the discharge port
Excavation and agitation is performed using the agitation blades 4 while ejecting in the vicinity of.

As mentioned above, when the mixing process in the predetermined depth range is completed, the rod part R is sequentially pulled up to the closed blade operating position shown in FIG. 6f, and the inner tube 1 is moved to the stopper 12, contrary to FIG. If the outer tube 2 is fixed and pushed down, the inner tube 1 will be in a relatively lifted state and the stirring blades 4 will be closed, so if the whole tube is pulled up in this state, it will be able to reach the required depth. A mixing process is performed.

FIG. 7 is an enlarged sectional view showing the connecting portion 15 of the rod portion R shown in FIG. 6e, and the inner tube 1 is connected to the outer tube 2.
A male threaded portion 1a for inserting a convex male threaded portion 16 fixed to the upper end and screwing a fixing nut 17 to the upper end.
is provided. When the fixing nut 17 is screwed onto the male threaded portion 1a at the upper end of the inner tube 1 and the concave female threaded portion 18 at the lower end of the connecting rod 14 is connected to the convex male threaded portion 16 of the outer tube 2, the concave portion 18a of the connecting rod 14 is connected.
is designed to prevent the fixing nut 17 from rising.

At this time, the lower inner tube 1 and the inner tube 1' of the connecting rod 14 are in communication via the connecting portion 1a, and the
It is sealed by a ring 19 etc. to prevent the soil improvement material from leaking.

In the case of this embodiment shown in Figs. 1 to 5, only one liquid is injected into one system through the inner pipes 1' and 1 as shown by the arrow a, and through the channel hole 9, but as shown by the arrow b Inner and outer tubes 2 are combined with a separate flow path passing through the outer tube.
It is also possible to separately inject two types of soil improvement materials consisting of two liquids into the system, and inject them respectively from the channel holes 9.

As explained in detail above, the blade expansion device for the stirring blades in the soil improvement machine according to the present invention has a simple structure in which the stirring blades can be opened and closed by simply moving up and down the inner pipe at the ground improvement machine position on the ground. The open/closed state of the stirring blades inside the rod, which cannot be visually confirmed, can be easily determined by checking the relative position of the inner tube and outer tube of the double tube rod, and the applied force can be adjusted. Work can be done without applying excessive force, and the wings can be easily fixed on the ground in an open state.

Furthermore, the link remains within the window of the excavation head regardless of whether the stirring blade is opened or closed, and only the stirring blade is exposed outside the excavation head, so failures are less likely.

Furthermore, since two liquids can be discharged from the drill head using the inner and outer pipes, two types of soil improvement materials can be separately injected into the ground.

Furthermore, the mechanism is simpler than the conventional wing-spreading method using water pressure, oil pressure, etc., and there are fewer failures, making the deep mixing method more effective for ground improvement.

[Brief explanation of drawings]

FIG. 1 is a front view showing a stirring blade expansion device according to the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a front view of FIG. 1 showing the blades in an open state, and FIG. 2, FIG. 5 is a sectional view taken along line BB in FIG. 3, FIGS. 6 a to f are explanatory diagrams showing the operating state of the wing spreading device according to the present invention, and FIG. FIG. 2 is an enlarged cross-sectional view showing the connecting portion of the inner and outer tubes according to the present invention. 1, 1'...Inner pipe, 2...Outer pipe, 3...Link,
4... Stirring blade, 5... Drilling head, 5a... Window, 6, 7, 8... Pin, 9... Channel hole.

Claims (1)

[Scope of Claims] 1. A ground improvement machine that mechanically mixes and stirs soil and a ground improvement material such as a solidification material using a stirring blade, comprising: an excavation shaft consisting of a double pipe of an inner pipe and an outer pipe; an excavation head provided at the lower end of the outer tube; a proximal end pivotally attached to the lower part of the window portion of the excavation head;
an agitating blade that is housed inside and outside the window and whose wings are expanded; and a link located within the window regardless of whether it is opened or closed, and the flow paths of the inner and outer pipes are connected to the respective discharge ports through separate flow paths of the excavation head. A device for expanding the stirring blades in a machine.