JPH086104Y2 - Drilling rig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an excavating device, and particularly to excavating the ground by rotating a excavating shaft by a drive device and using a head tip provided at the tip of the excavating shaft. Injecting a soil improver such as cement milk into the excavated hole, and mixing and stirring the excavated earth and sand with the soil improver by a stirring blade provided to project outward at an appropriate position of the excavation shaft. The present invention relates to an excavator that is used to construct soil cement piles.

[Prior Art and Its Problems] Conventionally, for the purpose of ground improvement, etc., the ground is excavated by an excavating device, and a soil improver such as cement milk is injected into the excavated hole, and the excavated earth and sand and the above A soil cement pile and the like were constructed by mixing and stirring with a soil improver.

Here, in such an excavating device, generally, the excavating shaft is rotated by the driving device, and the ground is excavated by the head provided at the tip of the excavating shaft, and the soil improving agent such as cement milk is supplied from the excavating shaft. It was poured into the excavated hole, and the excavated earth and sand and the soil improving agent were mixed and stirred by a stirring blade provided at an appropriate position of the excavation shaft.

However, in such an excavating device, the soil improver such as excavated earth and sand and cement milk is simply mixed and stirred by the head and stirring blades provided on the rotating excavating shaft as described above, These were not sufficiently mixed, and it was difficult to construct a soil cement pile or the like in which the excavated soil and the soil improver were uniformly mixed.

Further, in such an excavating device, since the excavating shaft only rotates in a certain direction as described above, there is a problem that the excavating device shifts the excavating direction due to the rotational twist.

Further, in the conventional excavation device, there is also a device in which the excavation shaft is inserted into a fixed casing and the casing suppresses the displacement in the excavation direction due to the excavation shaft.

However, even in such an excavating device, the excavated earth and sand and the soil improving agent such as cement milk are simply mixed by the rotation of the head and the stirring blade provided on the excavation shaft, so that they are sufficiently mixed. However, since the excavation shaft only rotates in a fixed direction, there is still a problem that the rotational twist still occurs and the excavation direction shifts.

Further, in recent years, as shown in JP-A-57-96123, etc., a stirring blade is provided on the inner peripheral surface of a casing through which the excavation shaft is inserted, and the casing is rotated in the direction opposite to the excavation shaft. , The excavated earth and sand and the soil improving agent were mixed and stirred in a casing, and developed.

However, in the excavation device shown in the above publications, as the excavation proceeds, the mixture of the excavated earth and sand and the soil improving agent, the excavated rock, clay, etc. are clogged in the casing, These pressures in the ground become very strong, large power is required to rotate the casing and the excavation shaft, the equipment becomes large, and when excavating the ground deeply, the excavated soil and soil improver However, there are problems that it is impossible to sufficiently mix and stir the inside of the casing, and the excavation by the excavation shaft cannot be performed well.

[Problems to be Solved by the Invention] In this invention, an excavation shaft is rotated by a driving device, and the ground is excavated by a head provided at the tip of the excavation shaft, and a soil improving agent such as cement milk is excavated. The soil cement pile, etc. was constructed by injecting it into the hole and mixing and stirring the excavated earth and sand with the soil improver by the agitating blades protruding outward at appropriate positions on the excavation shaft. It is an object of the present invention to solve the above problems in the device.

That is, the present invention, in the excavation device as described above, when excavating the ground and mixing and agitating the excavated soil and the soil improving agent such as cement milk, the excavated soil and the soil improving agent are sufficient. Mixed and stirred into
Soil cement piles, etc., in which these are evenly mixed, can be easily constructed, and due to the rotation twist,
The excavation direction does not shift, and the excavated earth and sand and the soil improver are mixed and agitated, the air in the casing, the excavated rock or clay is clogged in the casing, and the casing Even when excavating the ground deeply, the excavated earth and soil improver, etc. are sufficiently mixed and agitated in the casing, and stable excavation is achieved by the excavation axis. The task is to be able to do.

[Means for Solving the Problems] In the present invention, in order to solve the above problems, the driving device (10) rotates the excavation shaft (20),
A head (21) provided at the tip of the excavation shaft (20) excavates the ground, and a soil improver such as cement milk is injected into the excavated hole to provide an appropriate position for the excavation shaft (20). In a drilling device that mixes and stirs the earth and sand excavated by a stirring blade (22) provided on the outer side of the excavator, the diameter is approximately the same as the diameter excavated by the head (21). The excavation shaft (20) is inserted into a casing (30) of a constant diameter that rotates in the opposite direction to the shaft (20), and the auxiliary stirring blade (31) protrudes inward from the inner peripheral surface of the casing (30). ) Is provided in the vicinity of at least a part of the stirring blades (22) provided on the excavation shaft (20), and the excavation shaft (20) is configured by connecting a required number of rotation shafts (23). , So that it corresponds to the connection point of this rotary shaft (23), Than is a plurality of openings (32) so as to open through the gap in the axial direction on the peripheral surface of the single (30).

[Operation] In the excavation device of the present invention configured as described above, the excavation shaft (20) is rotated by the drive device (10), and the casing (30) through which the excavation shaft (20) is inserted.
Is rotated in the direction opposite to the excavation axis (20).

Then, the ground is excavated by the head (21) provided at the tip of the rotating excavation shaft (20) as described above, and the soil improving agent such as cement milk is excavated from the excavation shaft (20) in the hole. To be injected into.

Here, when the excavation is performed as described above, the casing (30) having a diameter substantially equal to the diameter excavated by the head (21).
The excavation direction is regulated by and the excavation shaft (20) and the casing (30) rotate in opposite directions. Therefore, the rotation twist due to the rotation of the excavation shaft (20) causes the casing (30) to rotate.
It is canceled by the rotation of, and the deviation in the excavation direction due to the rotation twist is also suppressed.

When the ground is excavated by the head (21) as described above and a soil improver such as cement milk is injected into the excavated hole from the excavation shaft (20), the excavated earth and sand and the cement milk etc. And the soil improver are mixed and stirred by the head (21) provided at the tip of the excavation shaft (20), and the soil is lifted to be introduced into the casing (30).

Then, the kneaded material of the excavated earth and soil and the soil improving agent thus introduced into the casing (30) and the stirring blade (22) provided on the rotating excavation shaft (20) as described above, and this excavation The shaft (20) and the auxiliary stirring blade (31) provided on the inner peripheral surface of the casing (30) rotating in the opposite direction are sufficiently mixed and stirred.

Further, the kneaded material of the excavated earth and soil and the soil improver, which are mixed and stirred by the stirring blade (22) and the auxiliary stirring blade (31) which rotate in the opposite directions in this way, the air in the casing (30), and the excavation. Part of the removed rocks and clay is casing (30)
Through the openings (32) opened on the peripheral surface of the casing (30) to be discharged into the holes excavated,
Kneaded material of excavated soil and soil conditioner is casing (30)
The casing (30) and the excavation shaft (20) can always be stably rotated without being clogged inside and the pressure in the casing (30) becoming very strong, and excavated earth and sand and soil improvement The agent and the like are sufficiently mixed and stirred in the casing (30), and the excavation by the excavation shaft (20) can be stably performed.

Then, after excavating in this way, when the excavation shaft (20) and the casing (30) are pulled up from within the excavated hole, the excavated earth and sand and the soil improving agent such as cement milk are uniformly mixed. Soil cement piles will be built.

Further, in the excavator of this invention, the rotary shaft (23)
Are connected by the required number to form the excavation axis (20), and the rotation axis (2
3) Since the opening (32) is opened in the peripheral surface of the casing (30) corresponding to the place where they are connected to each other,
The rotating shafts (23) can be easily connected to each other through the opening (32).

[Embodiment] 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 FIG. 1, a speed reducer (11) is provided under the drive unit (10), and a casing (30) is hung from the speed reducer (11).
The excavation shaft (20) is inserted into the casing (30), and the head (21) provided at the tip of the excavation shaft (20) is made to project downward from the lower end of the casing (30).

Then, the power from the drive device (10) is passed through the speed reducer (11) to the excavation shaft (20) and the casing (30).
The excavation shaft (20) and the casing (30) are rotated in opposite directions.

Here, in this embodiment, as the excavation shaft (20), a required number of rotating shafts (23) are connected via connecting members (24), respectively, and are provided at the lower end. A stirring blade (22) protruding outward is provided at a suitable position above the head (21).

On the other hand, the casing (30) includes the head (2
Use a diameter slightly smaller than the excavation diameter according to 1), and use an auxiliary stirring blade (31) protruding inward from the inner peripheral surface of the stirring blade (22) provided on the excavation shaft (20). A plurality of them are provided on the peripheral surface of the excavating shaft (20) so as to correspond to the positions of the connecting members (24) that connect the rotating shafts (23) to each other while being provided in the vicinity of the stirring blades (22) located below. The opening portion (32) of (1) is opened.

Then, the rotating shafts (23) constituting the excavation shaft (20) are connected to each other through the openings (32) provided in the casing (30) in this way.

Next, a case of constructing a soil cement pile or the like using the excavating device of this embodiment will be described.

Here, in the excavation device of this embodiment, although not shown, the excavation device is attached to a leader erected on the ground by a crawler crane or the like so that the excavation device can be moved up and down.

Then, the drive device (10) is driven, and the excavation shaft (20) and the casing (30) are rotated in opposite directions via the speed reducer (11) provided under the drive device (10). At the same time, the excavator is lowered along the leader to excavate the ground by the head (21) provided at the tip of the excavation shaft (20), and the soil improving agent such as cement milk from the excavation shaft (20). Was injected into the drilled hole.

Here, in the excavator of this embodiment, since the excavation shaft (20) and the casing (30) rotate in opposite directions as described above, the rotation twist due to the rotation of the excavation shaft (20) is It is canceled by the rotation of the casing (30),
Straight excavation began.

Further, when the excavation is performed in this manner, the earth and sand excavated by the head (21) as described above and the soil improving agent such as cement milk injected into the hole are removed from the head (21).
It is mixed and stirred by the soil and the soil is excavated.
0) has been led to.

Then, the kneaded material of the excavated soil and the soil improving agent thus mixed and stirred by the head (21) is mixed in the casing (3
When introduced into the casing (30), the kneaded product is guided by the agitating blade (22) and the auxiliary agitating blade (31) provided in the excavating shaft (20) and the casing (30) and rotating in opposite directions. ), The mixture was sufficiently stirred and mixed.

In addition, the kneaded mixture of the excavated soil and the soil improving agent thus mixed and stirred in the casing (30) and a part of the excavated rock or clay is part of the agitation provided on the excavation shaft (20). The casing (3) is passed through the opening (20) provided on the peripheral surface of the casing (30) by the rotation of the blades (22) or the like.
The kneaded material and the like remaining in the casing (30) while being discharged into the hole excavated from inside (0) are guided further upward, and the stirring blade (2) provided further above the excavating shaft (20).
2) to be agitated, and a part of it is provided on the peripheral surface of the casing (30) at the upper opening (20).
Through the inside of the casing (30) into the drilled hole. Therefore, the kneaded material of the excavated soil and the soil improving agent is not clogged in the casing (30) and the pressure in the casing (30) does not become very strong, and the casing (30) and the excavation shaft (20) are prevented. ) Constantly rotated, and the excavated earth and sand, the soil improving agent and the like were sufficiently mixed and stirred in the casing (30), and the excavation by the excavation shaft (20) was also stably performed.

After excavating in this way, raise this excavator along the leader and pull out the excavation shaft (20) and casing (30) from inside the excavated hole, , Soil cement piles have been constructed in which excavated soil and soil improver such as cement milk are uniformly mixed.

[Advantages of the Invention] As described in detail above, in the excavating device according to the present invention, the excavating shaft is rotated by the driving device, and the casing having the same diameter as the excavating diameter of the head is installed in the direction opposite to the excavating shaft. When the ground is excavated by the head provided at the tip of the rotating excavation shaft as described above, the excavation direction by the excavation shaft is regulated by the casing and the rotation by the rotation of the excavation shaft is performed. The twist is canceled by the rotation of the casing, and the excavation direction of the excavation axis does not shift as in the conventional case, and straight excavation can be performed.

Further, in the excavating device according to the present invention, the soil is excavated as described above, and a soil improving agent such as cement milk is injected into the excavated hole from the excavation shaft to excavate the soil and the cement excavated by the head. In mixing and stirring the soil improving agent such as milk, the excavated earth and sand and the soil improving agent such as cement milk are mixed and stirred by the above head, and the soil is lifted and guided into the casing. The kneaded material of the excavated earth and soil and the soil improving agent is mixed and stirred in this casing by the stirring blade and the auxiliary stirring blade that rotate in mutually opposite directions. Was thoroughly mixed and stirred, and it became possible to construct a soil cement pile in which these were uniformly mixed.

Further, in the excavating device according to the present invention, the kneaded material of the excavated soil and the soil improver introduced into the casing as described above, the air in the casing, a part of the excavated rock or clay, etc. The pressure inside the casing is so strong that rotation of the casing and the excavation shaft is suppressed because the discharge is made from the inside of the casing into the hole that has been excavated through the multiple openings provided on the peripheral surface of the casing. Therefore, the excavated earth and sand, the soil improving agent and the like are sufficiently mixed and stirred in the casing, and the excavation by the excavation shaft can be stably performed.

In addition, in the excavating device according to the present invention, the required number of rotating shafts are connected to each other to form the excavating shaft, and the casing is provided with an opening corresponding to the place where the rotating shafts are connected to each other. The connection of the can now be easily made through this opening.

[Brief description of drawings]

FIG. 1 is a partially cutaway schematic front view of an excavator according to an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view of the excavator according to the same embodiment. Explanation of symbols (10) …… Drive device, (20) …… Excavation axis, (21) …… Head, (22) …… Stirring blade, (23) …… Rotary axis, (30)
…… Casing, (31) …… Auxiliary stirring blade, (32) ……
Aperture.

Claims (1)

[Scope of utility model registration request] 1. A drive device (10) rotates an excavation shaft (20), a head (21) provided at the tip of the excavation shaft (20) excavates the ground, and a soil improving agent such as cement milk. So as to mix and stir the earth and sand excavated by the stirring blade (22) provided at the appropriate position of the excavation shaft (20) so as to project outward. In the excavator, the excavation shaft (2) is installed in a casing (30) having a diameter substantially equal to the excavation diameter of the head (21) and rotating in the opposite direction to the excavation shaft (20).
0) is inserted through the auxiliary stirring blade (31) protruding inward from the inner peripheral surface of the casing (30), and at least a part of the stirring blade (22) provided on the excavation shaft (20).
Is provided in the vicinity of the rotary shaft (2), and the excavation shaft (20) is configured by connecting a required number of rotary shafts (23).
A plurality of openings (3) are formed on the peripheral surface of the casing (30) at intervals in the axial direction so as to correspond to the connecting points of (3).
2) A drilling rig characterized by having an opening.