JP2002235322A - Ground improvement device and ground improvement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground improvement device and a ground improvement method capable of being rotated while revolving a rotary body for sufficiently stirring an earth and a paste and preventing the rotary body from being destroyed by a coarse substance such as gravel pebble or the like. SOLUTION: An excavtion hole H is excavaved by an excavator 4 located at the lower part of a shaft while rotating the shaft 1. The rotary body 9 on the side of the shaft l is rotated with an axis section 8 as the center while revolving around the shaft 1, and the earth and the paste are stirringly mixed. The rotary body 9 is positively rotated by joining frictional force of a first separable body 14 and a second separable body 16 respectively provided to a freely attached body 10 freely attached to the shaft 1 and the rotary body 9 to stirringly mix the earth with the paste. When the coarse substance such as gravel or the like hits against the rotary body 9 or cuts thereinto to increase soil resistance received by the rotary body 9, the first separable body 14 and the second separable body 16 are separated from each other to make the rotary body 9 get out of the soil resistance, and the rotation is stopped by joining frictional force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement apparatus and a ground improvement method for strengthening the ground by digging a drill hole in the ground.

[0002]

2. Description of the Related Art When a building is constructed, for example, the ground is strengthened. As a method of strengthening and improving the ground, a method of digging a drill hole in the ground and injecting a ground improving paste such as mortar into the drill hole has been widely practiced. The drilling hole rotates the upright shaft,
It is designed to excavate with an excavator mounted on the lower part of the shaft.

[0003] In order to improve the ground, it is desirable that the paste and the soil are sufficiently stirred and mixed in the borehole. The reason is that if the stirring and mixing of the paste and the soil are insufficient and the lump of the soil remains, the ground strength at that portion is significantly reduced locally. For this reason, it is known to stir the paste and the soil by providing a rotating body on the side of the shaft and rotating (rotating) the rotating body about its shaft.

[0004]

However, when there is a lot of coarse material such as gravel and pebbles in the soil, the coarse material is likely to hit the rotating body or bite to hinder its rotation (rotation).
In addition, the rotating body is easily broken due to this. Especially when demolishing old buildings and reclaiming the land to improve the ground, a large amount of concrete such as concrete fragments is mixed in the soil. The body is hindered from spinning and easily destroyed.

Therefore, the present invention can sufficiently stir the soil and the paste while rotating the rotating body for stirring the soil and the paste, even on the ground having a large resistance in the soil due to a coarse material or the like. An object of the present invention is to provide a ground improvement device and a ground improvement method that can eliminate the destruction of a rotating body.

[0006]

A ground improvement apparatus according to the present invention comprises a shaft which is driven by a driving unit and rotates, an excavator mounted on a lower portion of the shaft, and a shaft which is located on a side of the shaft. A rotating body that revolves around the periphery and rotates around the shaft to stir in the soil, a play portion rotatably attached to the shaft, and a laterally extending portion extending from the play portion to the side. An adhering body having an extending portion whose tip end bites into the peripheral wall of the excavation hole excavated by the excavator; a first contacting / separating body is provided on the adhering body; By providing an approaching / separating body and vertically moving the first approaching / separating body relative to the second approaching / separating body,
The first contacting / separating body and the second contacting / separating body are brought into contact with and separated from each other, and the rotating body is caused to rotate around the shaft portion by the joining frictional force.

Preferably, the first contacting / separating body is attached to the shaft so that the first contacting / separating body is vertically movable with respect to the rotating body. It is made to move up and down relatively with respect to the second contacting / separating body.

In the ground improvement method of the present invention, an excavation hole is excavated in the ground by an excavator attached to a lower portion of the shaft while rotating a vertical shaft by a driving unit and supplying a ground improvement paste. A ground improvement method in which a rotating body provided on the side of the shaft revolves around the shaft and rotates around its axis to mix and mix the soil and the paste. There is a loose body having a play portion rotatably mounted and an extension portion extending laterally from the play portion, and the extension portion is provided on a peripheral wall of a drill hole excavated by the excavator. The shaft is lowered and raised while preventing the rotation of the play body by biting the tip of the body, and provided on the play body by the relative height of the rotating body and the play body. Provided on the first contacting / separating body and the rotating body The rotating body is rotated about the shaft by the joining frictional force when the separated second contacting body is joined and separated from each other to mix and mix the soil and the paste. When it becomes difficult or impossible to rotate due to soil resistance, the second contacting / separating body is moved to the first
The rotating body was caused to run away from the soil resistance by rotating around the contacting / separating body.

Preferably, the first contact member and the second contact member are joined to and separated from each other by vertically moving the attached member relative to the rotating member. .

[0010] In the above configuration, the excavation hole is excavated while rotating the shaft. In this case, the first contact body and the second
When the contacting / separating bodies are joined to each other, the rotating body revolves around the shaft and the first contacting / separating body and the second
The rotating body positively rotates around its axis by the joining frictional force between the contacting / separating bodies and agitates the soil and the paste. Also, when the soil in the soil is large due to the contact with or digging into the rotating body due to soil, the first contacting / separating member and the second contacting / separating member are separated from each other, or the second contacting / separating member. Will idle around the first contacting / separating body. Therefore, the rotating body that is revolving does not forcibly rotate, but escapes from a large underground resistance, and is thus prevented from being destroyed. Then, when the first contacting member and the second contacting member separate from each other after escaping from the large soil resistance, the rotating member resumes rotation, and the soil and the paste are again stirred and mixed.

[0011]

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. 1 is a side view of the ground improvement device with the shaft lowered, FIG. 2 is a side view of the ground improvement device with the shaft raised, and FIG. 3 is a plan view of the lower part of the ground improvement device.

In FIG. 1, reference numeral 1 denotes a shaft, and a plurality of long plate-shaped stirrers 2 are provided to project sideways at a pitch. The stirrer 2 rotates integrally with the shaft 1 to stir the soil. The shaft 1 is in an upright posture,
Drive unit 3 provided in a working machine (not shown) such as a crane truck
And rotates in the forward and reverse directions about the axis thereof, and moves up and down.

An excavator 4 is mounted below the shaft 1. The excavator 4 is configured by projecting a plurality of excavating claws 4b downward on a protruding portion 4a that horizontally protrudes laterally from the shaft 1. In the lower part of the shaft 1, an outlet 6 for a paste for ground improvement is opened. The paste is pressure-fed from a paste supply unit (not shown) through the center hole 7 (FIG. 3) of the shaft 1 and discharged from the spout 6 into the excavation hole H and supplied.

In FIG. 1, a shaft portion 8 is provided upright on an upper surface of a projecting portion 4a of the excavator 4, and a rotating body 9 is mounted on the shaft portion 8 so as to be freely rotatable (rotated). ) Has been. The rotating body 9 is tapered slightly toward the outer end as shown in FIG. When the shaft 1 rotates,
The rotating body 9 is on the side of the shaft 1 and revolves around the shaft 1. In the first embodiment, the protruding portion 4a of the excavator 4 is also used as a mounting member for the shaft portion 8. However, a mounting member may be separately provided on the shaft 1, and the shaft portion 8 may be mounted on this mounting member. . In this case, the mounting member does not necessarily need to be provided at the lower portion of the shaft 1 and may be provided at a position considerably higher than the excavator 4. The mounting member is a shaft 1
May be provided in the length direction (height direction), and a rotating body may be mounted on each of the upper and lower tiers.

In FIG. 1, a tubular play portion 11 is mounted on a shaft 1 so as to be freely rotatable horizontally and vertically. An extension portion 12 that extends horizontally outward is connected to the play portion 11. The extension part 12 is a horizontal arm part 12a.
And a vertical portion 1 extending downward from the tip of the arm portion 12a.
2b. The play body 1 is composed of the play section 11 and the extension section 12.
0 is configured. Center of shaft 1 (axial line)
The extension length L1 of the attachment body 10 from the
Therefore, as shown in the figure, the tip of the vertical portion 12b bites into the peripheral wall S of the excavation hole H excavated by the excavator 4. The play body 10 is freely rotatably mounted on the shaft 1. When the tip of the vertical portion 12b bites into the peripheral wall S, the play body 10 is prevented from rotating.
As shown in FIG. 2 and FIG. 3, a plurality of extending portions 12 (two in the first embodiment, two on both sides) extend laterally.

In FIG. 1, the shaft 1 has a loose fitting portion 1
A stopper 13 is provided for defining the ascending limit of 1. A disc-shaped first contacting / separating body 14 is horizontally mounted below the play portion 11, and its outer peripheral surface is a tapered joining surface 15 having a thinner shape. Also, a disc-shaped second contacting / separating body 16 is horizontally mounted below the rotating body 9, and the outer peripheral surface thereof is a tapered joining surface 17 having an upper taper. The first contacting / separating member 14 moves up and down relatively to the second contacting / separating member 16, so that the joining surfaces 15 and 1
7 are joined and separated from each other. That is, the first contacting / separating member 14 and the second contacting / separating member 16 constitute a friction clutch.

The play body 10 can move up and down relatively with respect to the rotating body 9, and the play body 10 is slightly moved relative to the rotating body 9 as shown in FIG. When ascending (arrow a), the joining surface 15 of the first contacting / separating body 14 separates from the joining surface 17 of the second contacting / separating body 16 (see the gap G in FIG. 1). Further, as shown in FIG.
Is lowered relative to the rotating body 9 by its own weight (arrow b), the joining surface 15 of the first contacting / separating body 14 is joined to the joining surface 17 of the second contacting / separating body 16. By joining the joining surface 15 to the joining surface 17, the lowering limit of the play body 10 is regulated. That is, the second contacting / separating body 16 also serves as a stopper that defines the lower limit of the play body 10.

In FIGS. 1 and 2, the play body 10 is freely mounted on the shaft 1 so as to be vertically movable. Then, the attached body 10 is always going down due to its own weight, and as shown in FIG.
When the joining surface 15 and the joining surface 17 of the joint 16 are joined, the second contact / separator 16 revolves around the shaft 1 (arrow c). The rotating body 9 integral with the rotating body 9 positively rotates around the shaft 8 (arrow d), and the rotating body 9 stirs and mixes the soil and the paste.

Further, if a coarse substance K such as gravel or pebbles in the soil hits or digs into the rotating body 9 and the soil resistance received by the rotating body 9 increases, it is difficult for the rotating body 9 to revolve during rotation. Becomes impossible. In this case, the rotating body 9 is connected to the second contacting / separating body 16.
Revolves around the shaft 1 (arrow c) while rotating around the first contacting / separating body 14 (or with a small gap G between the joining surfaces 15 and 17 as shown in FIG. 1). Therefore, the rotating body 9 is not forcibly rotated by the joining frictional force, so that the rotating body 9 is prevented from being broken by the soil resistance (coarse material K). Alternatively, when the rotation of the rotating body 9 becomes difficult or impossible due to the soil resistance, the loose body 10 rises due to the soil resistance and the first contacting / separating body 14 is separated from the second contacting / separating body 16. Since it separates (the state shown in FIG. 1), the rotation of the rotating body 9 due to the joining frictional force is stopped, and the rotating body 9 is escaped from the destruction. And shaft 1
When the rotating body 9 passes through the soil resistance (coarse matter K) due to the lowering or rising of the floating body, the loose body 10 descends by its own weight, and the first contacting / separating body 14 is joined to the second contacting / separating body 16 again. (Fig. 2
), The rotating body 9 that is revolving restarts its rotation (arrow d) due to the joining frictional force, and again mixes the soil and the paste with stirring.

In short, the loose body 10 moves up and down relative to the rotating body 9 due to its own weight and the resistance received from the soil in the excavation hole. In this state, the rotating body 9 positively rotates by the joining frictional force, and stirs and mixes the soil and the paste. Further, in a state where the contacting / separating members 14 and 16 are joined to each other, when the soil resistance increases due to a rough object K hitting the rotating member 9 or the like, the second contacting / separating member 16 becomes the first contacting member. The rotation of the rotating body 9 is suppressed by revolving while rotating around the peripheral surface of the contacting / separating body 14.
Stopped and escaped from being forcibly rotated.

This ground improvement apparatus has the above-described configuration, and its operation will be described below. As shown in FIG. 1, the shaft 1 is held vertically, and is lowered while being positively rotated about its axis by the drive unit 3. Then, the excavator 4 also rotates together with the shaft 1 and excavates the excavation hole H in the ground.

When the excavation hole H has been excavated to a predetermined depth, the shaft 1 is raised while rotating in the reverse direction.
As described above, when the shaft 1 is lowered and raised to excavate the excavation hole H, as described above, the rotating body 9 that is revolving is the first rotating body 9.
The rotation of the soil and the paste is positively agitated by the joining frictional force between the contacting / separating body 14 and the second contacting / separating body 16. Further, when the underground resistance of the rotating body 9 is increased due to the impact of the coarse material K on the rotating body 9, the rotating body 9 is suppressed or stopped from rotating, and is prevented from being broken due to forcibly trying to rotate.

(Embodiment 2) FIGS. 4 to 6 are side views of a ground improvement apparatus according to Embodiment 2 of the present invention, and FIG. 7 is a partially exploded view of the ground improvement apparatus. 4 shows a state in which the contacting / separating body is free (neutral), FIG. 5 shows a state in which the shaft is moving down, and FIG. 6 shows a state in which the shaft is moving up. The same elements as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the present invention, the lowering / raising of the shaft means
In addition to the descent during excavation and the ascent after the end of excavation, it also includes the case where the shaft temporarily descends and rises for some reason.

In FIG. 4, a second contacting / separating body 16 'is horizontally rotatably mounted on a shaft portion 8' provided on the projecting portion 4a of the excavator 4, and is rotatably mounted on the shaft portion 8 '. A body 9 'is provided.

A tubular play portion 11 'is rotatably and vertically movablely attached to the shaft 1, and an extension portion 12' which extends horizontally outward is connected to the play portion 11 '. Have been. A play body 10 'is composed of the play part 11' and the extension part 12 '. The extension length L1 of the loose body 10 'from the center of the shaft 1 is longer than the extension length L2 of the excavator 4, so that the tip of the extension portion 12' bites into the peripheral wall S of the excavation hole H. .

The first contacting / separating body 1 is provided below the play portion 11 '.
4 'is provided. In FIG. 7, the first contacting / separating body 1
Reference numeral 4 'denotes a pulley having an outer peripheral surface inwardly concave, and has a tapered upper joint surface 15a' and a lower joint surface 15b '. The outer peripheral surface of the second contacting / separating body 16 ′ projects in a tapered shape, and has a tapered upper joint surface 17 a ′ and a lower joint surface 17 b ′. These two joint surfaces 17
a 'and 17b' also serve as stoppers for defining a relative lowering limit and a rising limit of the first contacting / separating body 14 'with respect to the second contacting / separating body 16'.

FIG. 4 shows a state in which the first contacting / separating member 14 'and the second contacting / separating member 16' are separated by a gap G, and the second contacting / separating member 16 'is the first contacting / separating member 16'. It is in a free (neutral) state with respect to the contacting / separating body 14 '. In this state, even if the rotating body 9 'revolves around the shaft 1', the second
Of the first contacting / separating body 14 'idles around the first contacting / separating body 14', so that the rotating body 9 'does not rotate and revolves (arrow c).
Only.

FIG. 5 shows a state in which the shaft 1 is lowered to excavate the excavation hole H. In this state, the play body 1
0 ′ and the first contacting / separating body 14 ′ integral therewith rise slightly relative to the second contacting / separating body 16 ′ due to soil resistance (arrow a), and the joining surface 15b ′ The second contacting / separating body 16 'and the rotating body 9' integral therewith are revolved around the shaft 1 while rotating (arrow d) around the shaft 8 'by the joining frictional force. (Arrow c) and stir the soil and mortar.

FIG. 6 shows a state where the shaft 1 is raised. In this state, the attachment surface 15a 'of the first contacting / separating body 14' is moved by the second contacting / separating body 1 'due to its own weight.
The second contacting / separating body 1 is brought into contact with the joining surface 17a 'of the 6'.
The rotating body 9 'revolves around the shaft 1 (arrow c) while rotating (arrow d) around the shaft portion 8' due to the joining frictional force between the two. ), Stir the soil and mortar.

Further, when a coarse substance K such as gravel or pebbles in the soil hits or digs into the rotating body 9 ', and the soil resistance received by the rotating body 9' becomes larger than the above-described frictional force, the rotating body 9 ''Becomes difficult and impossible to rotate. In this case, the second contacting / separating member 16 'idles around the first contacting / separating member 14' and the rotating member 9 'revolves around the shaft 1 (arrow c). The rotating body 9 'is not forced to rotate by the joining frictional force, so that the rotating body 9' is prevented from being broken by the soil resistance (coarse matter K).

The present invention is not limited to the above-described embodiment. For example, the first contacting member and / or the second contacting member can be made to have a positive friction surface by roughening the joining surface.
Thereby, a large joining frictional force may be generated to more positively rotate the second contacting / separating body.

[0032]

As described above, according to the present invention, while rotating the rotating body around the shaft, the rotating body is positively activated by the joining frictional force between the first contacting / separating body and the second contacting / separating body. By rotating around the shaft, the soil and the paste can be sufficiently stirred and mixed. In addition, when rough material such as gravel or pebbles hits or digs into the rotating body and the soil resistance received by the rotating body increases, the rotating body escapes from the soil resistance and stops rotation due to joining frictional force. By doing so, it is possible to prevent the rotating body from being forcibly rotated and destroyed by resistance in the ground.

[Brief description of the drawings]

FIG. 1 is a side view of a ground improvement device with a shaft descending according to a first embodiment of the present invention.

FIG. 2 is a side view of the ground improvement device in which the shaft is rising according to the first embodiment of the present invention.

FIG. 3 is a plan view of a lower portion of the ground improvement device according to the first embodiment of the present invention.

FIG. 4 is a side view of a ground improvement device in a free state according to the second embodiment of the present invention.

FIG. 5 is a side view of the ground improvement device with the shaft descending according to the second embodiment of the present invention.

FIG. 6 is a side view of a ground improvement device in which a shaft is rising according to a second embodiment of the present invention.

FIG. 7 is a partially exploded view of a ground improvement device according to Embodiment 2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft 3 Drive part 4 Excavator 8, 8 'Shaft part 9, 9' Rotating body 10, 10 'Playing body 11, 11' Playing part 12, 12 'Extension part 14, 14' 1st contact | separation Body 16, 16 'Second contact body

Continuation of the front page F term (reference) 2D040 AB05 BA08 CB03 DB07 EA01 EA11 EA16

Claims (4)

[Claims] A shaft that is driven by a drive unit to rotate; an excavator mounted on a lower portion of the shaft; and a shaft that is revolved around the shaft at a side of the shaft and rotates around the shaft. A rotating body that stirs in the soil by doing, a play portion rotatably attached to the shaft, and a peripheral wall of a drilling hole that extends laterally from the play portion and is excavated by the excavator. A first attachment / detachment body provided on the rotating body and a first attachment / detachment body provided with the first attachment / detachment body; Is moved up and down relatively with respect to the second contacting / separating body, thereby causing the first contacting / separating body and the second contacting / separating body to move toward and away from each other, and causing the rotating body to move by the joining frictional force. A ground improvement device characterized in that it rotates on the shaft. 2. The first contacting / separating member is attached to the shaft by vertically attaching the attaching portion to the shaft so as to be movable up and down with respect to the rotating member. 2. The ground improvement device according to claim 1, wherein the ground improvement device is moved up and down relatively with respect to the two contacting / separating bodies. 3. A drilling hole is excavated in the ground by an excavator mounted on a lower portion of the shaft while rotating a vertical shaft by a driving portion and supplying a ground improvement paste. Is a ground improvement method in which the rotating body provided in the orbit is revolved around the shaft and rotated around its axis to mix and mix the soil and the paste, wherein the soil is freely rotatably attached to the shaft. There is a loose body having a play portion and an extension portion extending laterally from the play portion, and the tip of the extension portion is cut into the peripheral wall of the drill hole drilled by the drilling element. A first contacting / separating body provided on the loose body according to the relative height of the rotating body and the loose body, wherein the shaft is lowered and raised while preventing rotation of the loose body; And the second provided on the rotating body
The rotating body is rotated about the shaft portion to mix and mix the soil and the paste by the joining frictional force when the contacting and separating bodies are joined to and separated from each other, and the rotating body is configured to have a resistance in the soil. When the rotation becomes difficult or impossible due to, the second contacting / separating body is caused to idle around the first contacting / separating body to allow the rotating body to escape from the soil resistance. Ground improvement method to do. 4. The method according to claim 1, wherein the first contact member and the second contact member are joined and separated from each other by vertically moving the play body relative to the rotating member. The ground improvement method according to claim 3, wherein: