JPH0593421A - Drilling rig - Google Patents

Abstract

(57) [Summary] [Purpose] In the hole drilled by the drilling head, the drilled earth and sand can be sufficiently mixed and stirred with the hardening agent and the soil improving agent, and these can be uniformly kneaded, and Provide a drilling rig capable of stable improvement and construction of foundation piles and continuous underground walls. [Structure] Drilling head 1 provided at the tip of excavation shaft 10
In the excavating device for excavating the ground 1 by 1 and injecting a hardening agent such as cement milk or a soil improving agent into the excavated hole 2 to mix and stir the excavated earth and sand with the hardening agent or the soil improving agent. The stirring shafts 20 provided with the stirring members 21 are arranged in parallel on both sides of the excavation shaft 10, and the stirring shafts 20 are higher than the rotation speed of the excavation shaft 10 and the excavation shaft 1
It was rotated in the direction opposite to 0.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention excavates the ground by a drilling head provided at the tip of an excavating shaft, and injects a hardening agent such as cement milk or a soil improving agent into the excavated hole to perform excavation. The present invention relates to an excavating device adapted to mix and stir the prepared earth and sand with the above-mentioned hardening agent and soil improving agent, and thoroughly mix and stir the earth and sand excavated in the drilled hole with the hardening agent and soil improving agent. Then, these are uniformly kneaded so that stable ground improvement and foundation construction can be performed.

[0002]

2. Description of the Related Art Conventionally, a ground is drilled by a drilling head provided at the tip of a drilling shaft, and a hardening agent such as cement milk or a soil improving agent is injected into the drilled hole,
By using an excavator that mixes and mixes excavated earth and sand with the above-mentioned hardening agents and soil improvers, it is performed to improve the ground and to construct foundation piles and underground continuous walls. It was

As such an excavating device, generally, an excavating shaft is vertically provided downward from a drive device, and a drilling hole for ejecting a hardening agent such as cement milk or a soil improving agent to the tip of the excavating shaft. A head was attached and a stirring member such as a stirring blade was provided at an appropriate position on the excavation shaft.

In this excavating device, the excavating shaft is rotated by the driving device, and the ground is excavated by the drilling head attached to the tip of the drilling device. The improver is ejected, and in the excavated hole, the excavated earth and sand and the hardening agent or soil improver are mixed and stirred by the stirring member provided on the drilling head and the drilling shaft to knead them. After that, the kneaded material was hardened to improve the ground, and foundation piles and underground continuous walls were constructed.

Here, when excavating the ground by the boring head attached to the tip of the boring shaft as described above, it is necessary to give a large turning torque to the boring bed. It was necessary to slow down the rotation speed of.

However, if the rotation speed of the excavating shaft is slowed in this way, the earth and sand excavated by the boring head and the agitating member cannot be sufficiently mixed and agitated with the hardening agent and the soil improving agent, and a particularly large amount is required. When drilling a hole, the rotation speed of the excavation shaft becomes slower, the mixing and stirring of these further decreases, and the kneading state of the excavated earth and sand with the hardening agent or soil improver deteriorates. When it is hardened, unevenness occurs, and there is a problem that it is not possible to stably improve the ground or construct stable foundation piles and underground continuous walls.

Further, in the excavation equipment as described above,
The drilling head and the stirring member are provided on the same excavating shaft, and since these only rotate in the same direction, the mixed stirring of the excavated earth and sand with the hardening agent or the soil improving agent is not sufficiently performed, There is also a problem that the kneading state of these becomes worse.

For this reason, in the prior art, an outer pipe that rotates in the opposite direction to the excavation shaft is provided so as to cover the outer periphery of the excavation shaft, and a stirring member is provided on the outer pipe to harden the excavated earth and sand. There were drilling rigs that were mixed and stirred with agents and soil conditioners.

However, even in such an excavating device,
Especially when excavating a large hole, mixing and stirring of the excavated earth and sand with a hardening agent or soil improver is not sufficiently performed, and stable ground improvement or stable foundation piles or underground continuous walls etc. are performed. There was a problem that it could not be built.

[0010]

SUMMARY OF THE INVENTION The present invention excavates the ground by a boring head provided at the tip of an excavating shaft and injects a hardening agent such as cement milk or a soil improving agent into the bored hole. It is an object of the present invention to solve the above-mentioned problems in an excavating device which mixes and agitates the excavated earth and sand with the above-mentioned hardening agent or soil improving agent.

That is, according to the present invention, when the excavated earth and sand and the hardening agent and the soil improving agent are mixed and stirred in the hole excavated as described above, the mixing and stirring of these are sufficiently carried out so that they are uniformly mixed. To be kneaded into
An object of the present invention is to make it possible to improve the ground stably and to construct foundation piles without causing unevenness in the hardened material when the kneaded material is hardened.

[0012]

In order to solve the above problems, the present invention excavates the ground 1 by means of a boring head 11 provided at the tip of an excavating shaft 10 and a drilled hole 2 A hardener such as cement milk or a soil improving agent is injected into the inside, and the excavating device is adapted to mix and agitate the excavated earth and sand with the hardening agent or the soil improving agent. Agitating shafts 20 provided with agitating members 21 for mixing and agitating the earth and sand excavated in the holes 2 with a hardening agent or a soil improving agent are arranged in parallel on both sides of the excavating shaft 10, and the agitating shafts 20 are provided. The rotation speed is higher than the rotation speed of 10, and the rotation is performed in the opposite direction to the excavation shaft 10.

Further, if necessary, it is preferable to provide a rotating device 30 for rotating the stirring shafts 20 arranged in parallel on both sides of the excavation shaft 10 as a center.

Further, when the stirring member 21 is provided on the stirring shaft 20, it is preferable to provide a stirring blade 22 protruding in a circular arc shape outward in the radial direction along the axial direction of the stirring shaft 20.

[0015]

In the excavating device according to the present invention, the excavating shaft 10 is rotated, and the stirring shafts 20 arranged on both sides of the excavating shaft 10 are rotated at a speed higher than the rotational speed of the excavating shaft 10.
While rotating in the opposite direction, lower this excavator,
The ground 1 is excavated by the boring head 11 provided at the tip of the boring shaft 10, and a hardening agent such as cement milk or a soil improving agent is injected into the bored hole 2.

Then, further excavation is performed while mixing and stirring the earth and sand excavated by the boring head 11 with the above-mentioned hardening agent and soil improving agent, and the agitating shafts 20 provided on both sides of the excavating shaft 10 are excavated. Guided into the bored hole 2 and excavated earth and sand and the above-mentioned hardening agent and soil improving agent are each agitating shaft 20.
By the stirring member 21 provided in the
Mix and stir at a high speed in the opposite direction.

The earth and sand thus excavated and the above-mentioned hardening agent and soil improving agent are excavated in the excavated hole 2 and a stirring member which rotates at a high speed in a direction opposite to the direction of the excavated head 11. By mixing with 21
These are sufficiently mixed and stirred so that they are uniformly kneaded.

While the earth and sand excavated in this way are mixed and stirred with the hardening agent and the soil improving agent, the hole 2 having the required depth is formed in the ground 1 by the boring head 11 provided at the tip of the boring shaft 10. After excavating, the excavating device is raised to pull up the excavating shaft 10 and the stirring shafts 20 provided on both sides thereof from the excavated hole 2 to excavate the excavated earth and sand and a hardening agent or a soil improving agent. The and the kneaded mixture is cured.

Even when the excavation device is raised as described above and the excavation shaft 10 and the stirring shafts 20 provided on both sides thereof are pulled up from within the excavated hole 2, the excavation shaft 10 and both sides thereof are When the stirring shaft 20 is rotated, the excavated earth and sand and the hardening agent and the soil improving agent are further mixed and stirred in the excavated hole 2 to be more uniformly kneaded.

Further, as described above, the rotating device 30 for rotating the agitating shafts 20 arranged in parallel on both sides of the excavating shaft 10 about the excavating shaft 10 is provided. When the provided stirring shaft 20 is rotated around the excavation shaft 10, the excavated earth and sand and the hardening agent or soil improving agent are used as described above to form the drilling head 11
The mixture is thoroughly mixed and stirred in the whole hole 2 drilled by the
The excavated earth and sand can be uniformly kneaded with the hardening agent and the soil improving agent.

Further, when the stirring shaft 20 is provided with a stirring blade 22 as an agitating member 21, the stirring blade 22 is projected in an arc shape outward in the radial direction along the axial direction of the stirring shaft 20.
The excavated earth and sand and the hardening agent and the soil improving agent are mixed and stirred while being dispersed in various directions by the rotation of the stirring blade 22, and the excavated earth and sand and the hardening agent and the soil improving agent are more uniform. To be kneaded.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An excavator according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings.

In the excavator of this embodiment, as shown in FIGS. 1 and 2, a speed reducer 4 is provided below the drive unit 3, and the excavation shaft 10 is suspended downward from the center of the speed reducer 4. At the same time, the agitating shafts 20 each having a shorter length than the excavating shaft 10 are hung downward from the speed reducer 4 on both sides of the excavating shaft 10. When rotating the excavation shaft 10 and the stirring shafts 20 provided on both sides of the excavation shaft 10 by the drive device 3, the speed of the stirring shafts 20 on both sides of the excavation shaft 10 is higher than that of the excavation shaft 10 by the speed reducer 4. It was made to rotate in the opposite direction to 10.

Further, in this embodiment, a rotating device 30 is provided below the driving device 3, and stirring shafts 20 arranged side by side on both sides of the excavation shaft 10 are located at 90 degrees to the left and right around the excavation shaft 10. ° It can be rotated.

Then, the excavating shaft 10 rotating as described above.
The ground 1 was excavated at the tip of, and a drilling head 11 for ejecting a hardening agent such as cement milk or a soil improving agent was attached.

On the other hand, in each stirring shaft 20 provided on both sides of the excavation shaft 10, the earth and sand excavated in the hole 2 excavated by the boring head 11 is mixed and stirred with the hardening agent and the soil improving agent. As the agitating member 21, each agitating shaft 20 is provided with an agitating head 23, and above the agitating head 23, the agitating head 23 is curved in a circular arc shape outward in the radial direction along the axial direction of the agitating shaft 20. A plurality of stirring blades 22 are provided so as to be alternately opposed to each other. When the agitation head 23 and the agitation blade 22 are provided on each agitation shaft 20, they are rotated in the hole 2 excavated by the hole-drilling head 11.

Further, in the excavating device of this embodiment,
In order to keep the distance between the excavation shaft 10 and the stirring shafts 20 provided on both sides thereof constant at all times, the excavation shaft 10 and the both sides thereof are connected by the connecting bands 5 at the upper end portion and the lower end portion of the stirring shaft 20, respectively. The stirring shaft 20 is rotatably connected.

When the excavation device of this embodiment is used to improve the ground or to construct foundation piles or continuous underground walls, the drive device 3 is driven and the drive device 3 is placed below the drive device 3. The excavation shaft 10 is rotated via the speed reducer 4 provided, and the stirring shafts 20 provided on both sides of the excavation shaft 10 are rotated at a speed higher than that of the excavation shaft 10 and in the opposite direction to the excavation shaft 10. In this way, the agitating shafts 20 arranged in parallel on both sides of the excavating shaft 10 by the rotating device 30 are rotated 90 degrees to the left and right around the excavating shaft 10.

Then, in this state, the excavation device is lowered, and as shown in FIG. 2, the ground 1 is excavated by the drilling head 11 provided at the tip of the drilling shaft 10, and the cement is cut from the drilling head 11. A hardening agent such as milk or a soil improving agent is ejected into the excavated hole 2, and the earth and sand excavated by the boring head 11 and the ejected hardening agent or soil improving agent are mixed and stirred for further excavation. Each stirring shaft 20 provided on both sides of the shaft 10 is guided into the excavated hole 2, and the excavation hole 2 is excavated by the stirring head 23 and the stirring blade 22 provided in each stirring shaft 20. The soil and sand and the hardening agent and the soil improving agent were further mixed and stirred.

In the hole 2 thus excavated, the excavated earth and sand, the hardening agent and the soil improving agent are mixed with each stirring shaft 20.
When the stirring head 23 and the stirring blade 22 provided in the mixing shaft are used for mixing and stirring, the stirring head 23 and the stirring blade 22 provided in each stirring shaft 20 are opposite to the drilling head 11 provided in the excavating shaft 10. Since it rotates at a high speed in the direction, the excavated earth and sand and the hardening agent and the soil improving agent are mixed with the boring head 11 and the drilled hole 2
They were sufficiently mixed and stirred in the inside so that they could be uniformly kneaded.

Further, in this embodiment, as described above, each stirring shaft 20 is rotated by the rotating device 30 so that the excavation shaft 1 can be rotated.
Since it rotates 90 degrees to the left and right around 0, the mixing and stirring as described above is performed in the entire hole 2 that has been excavated, and the excavated earth and sand and the hardener and soil improver are excavated. The whole inside of the prepared hole 2 was sufficiently mixed and stirred, and kneaded uniformly. Further, in the present embodiment, each stirring shaft 20 is provided with the stirring blade 21 as the stirring member 21 and the stirring blade 22 protruding in a circular arc shape outward in the radial direction along the axial direction thereof. The kneaded material of the earth and sand excavated by the stirring blade 22 and the hardening agent or the soil improving agent is further mixed and stirred while being dispersed in various directions, and the kneaded material of the excavated earth and sand and the hardening agent or the soil improving agent. The objects became more evenly distributed throughout the drilled holes 2.

While the earth and sand excavated as described above is mixed and stirred with the hardening agent and the soil improving agent, the hole 2 having the required depth is formed in the ground 1 by the boring head 11 provided at the tip of the boring shaft 10. After excavating, the excavating device was raised to pull up the excavating shaft 10 and the stirring shafts 20 provided on both sides thereof from the excavated hole 2. When pulling up the excavation shaft 10 and each stirring shaft 20 from the inside of the excavated hole 2, if they are rotated in the same manner as during excavation, the earth and sand excavated in the excavated hole 2 and The hardening agent and the soil improving agent are further mixed and agitated, so that the entire inside of the drilled hole 2 is kneaded more uniformly.

After the excavation shaft 10 and each agitation shaft 20 are pulled up from the excavated hole 2 as described above, the kneaded material in which the excavated earth and sand and the hardening agent or the soil improving agent are kneaded is excavated. It was made to cure in the formed hole 2. In addition, when hardening the kneaded material in which the earth and sand excavated in this way and the hardening agent and the soil improving agent are hardened, the whole hole 2 where the excavated earth and sand and the hardening agent and the soil improving agent are dug Since it was kneaded evenly in the building, unevenness did not occur in the hardened material, and stable ground improvement and foundation pile construction became possible.

Incidentally, in the excavating device of this embodiment,
Although the hardening agent such as cement milk or the soil improving agent is ejected only from the drilling head 11 provided at the tip of the drilling shaft 10, the stirring shafts 2 on both sides are provided in addition to the drilling head 11.
It is also possible to eject from the stirring head 23 provided at the tip of 0.

[0035]

As described above in detail, in the excavating device according to the present invention, the ground is excavated by the boring head provided at the tip of the boring shaft, and the cement milk or the like is hardened in the boring hole. Injecting agent and soil improver, mixing and stirring excavated earth and sand with the hardening agent and soil improver, agitating shafts provided with agitating members on both sides of the excavating shaft are provided in parallel, and each agitating Since the shaft was rotated at a speed higher than the rotation speed of the excavation shaft and in the direction opposite to the excavation shaft, the earth and sand excavated in the excavated hole, the hardening agent and the soil improving agent were sufficiently mixed and stirred, and Was uniformly kneaded, and when the kneaded product was cured, unevenness did not occur in the cured product.

As a result, when the excavation device according to the present invention is used to improve the ground or to construct foundation piles or continuous underground walls, etc., the excavated earth and sand and the hardening agent or soil improving agent are used. And are sufficiently mixed and stirred so that they are evenly kneaded, and there is no unevenness when cured, and the ground is improved and foundation piles and underground continuous walls are stably constructed. I was able to do it.

When the agitating shafts arranged on both sides of the excavating shaft are rotated about the excavating shaft by the rotating device, the excavated earth and sand and the hardening agent and the soil improving agent are excavated in the hole. The kneading became more uniform in the whole, and it became possible to further improve the ground and construct foundation piles and continuous underground walls.

In addition, when an agitating blade protruding in an arc shape is provided outward in the radial direction along the axial direction of the agitating shaft, the excavated earth and sand and the hardening agent and the soil improving agent form a part of the agitating blade. By rotating and mixing in a variety of directions while mixing and mixing, the excavated earth and sand and the hardening agent and soil improver will be kneaded more uniformly, improving the ground and building foundation piles and underground continuous walls. Became more stable.

[Brief description of drawings]

FIG. 1 is a front view of an excavating device according to an embodiment of the present invention.

FIG. 2 is a view showing a usage state of the excavating device of the same embodiment.

FIG. 2 is a view showing a state where a stirring shaft used in the excavating device of the embodiment is viewed from above.

FIG. 4 is a left side view of the agitating shafts on both sides of the hole in the hole excavated by the excavating device according to the embodiment.
It is a schematic plan view showing a state of being rotated by °.

[Explanation of symbols]

 1 Ground 2 Hole 10 Excavation Shaft 11 Drilling Head 20 Stirring Shaft 21 Stirring Member 22 Stirring Blade 30 Rotating Device

[Procedure amendment]

[Submission date] September 16, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief explanation of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a front view of an excavating device according to an embodiment of the present invention.

FIG. 2 is a view showing a usage state of the excavating device of the same embodiment.

FIG. 3 is a view showing a state where a stirring shaft used in the excavating device of the embodiment is viewed from above.

FIG. 4 is a left side view of the agitating shafts on both sides of the hole in the hole excavated by the excavating device according to the embodiment.
It is a schematic plan view showing a state of being rotated by °.

[Explanation of Codes] 1 Ground 2 Hole 10 Drilling Axis 11 Drilling Head 20 Stirring Axis 21 Stirring Member 22 Stirring Blade 30 Rotating Device

Claims (3)

[Claims] 1. The ground 1 is excavated by a boring head 11 provided at the tip of an excavating shaft 10, and a hardening agent such as cement milk or a soil improving agent is injected into the bored hole 2 to be excavated. In an excavation device adapted to mix and stir the earth and sand with the hardening agent or the soil improving agent, the earth and sand excavated in the hole 2 excavated by the boring head 11 is mixed and stirred with the hardening agent or the soil improving agent. Stirring member 2
The stirring shafts 20 provided with No. 1 are arranged side by side on both sides of the excavation shaft 10, and each stirring shaft 20 is rotated at a speed higher than the rotation speed of the excavation shaft 10 and in the opposite direction to the excavation shaft 10. Characteristic drilling equipment. 2. A rotating device 3 for rotating agitation shafts 20 arranged in parallel on both sides of the excavation shaft 10 about the excavation shaft 10.
The excavator according to claim 1, wherein 0 is provided. 3. When the stirring member 21 is provided on the stirring shaft 20, the stirring blade 22 is provided along the axial direction of the stirring shaft 20 so as to project in a circular arc shape outward in the radial direction thereof. The excavator according to claim 1 or claim 2.