JP2006274578A - Widening excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a widening excavator capable of easily and positively enlarging diameters of widening excavation blades and assisting the excavation biting force of the tip parts of the widening excavation blades even when the vicinity of the widening excavation blades is integrated into cylindrical shape due to clayey soil in an excavated layer. <P>SOLUTION: The widening excavator with the widening excavation blades 4 disposed through rocking shafts 3 at an excavating rod 2 with an excavating blade 1 disposed, opens the widening excavation blades 4 for diameter enlargement by changing the rotating direction of the excavating rod 2 from a normal rotating direction of the excavating blade 1 into a reverse rotating direction, wherein springs 5 are provided for energizing the widening excavation blades 4 in an opening direction, and an interlocking member 6 for interlocking the respective widening excavation blades 4 is laid across the widening excavation blades 4 provided in a lateral pair. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a widening excavator, and in particular, even when the vicinity of a widening excavation blade is integrated into a cylindrical shape by the clay of the excavation layer, the diameter of the widening excavation blade can be easily and reliably expanded, The present invention relates to a widening excavator that can assist in excavating biting force at the tip of a excavating blade.

When constructing piles in the ground or building ready-made hollow piles, a construction method that uses a mortar or the like to create an enlarged portion with a larger diameter than the pile at the lower end of the pile has been used conventionally. It has been broken.
This widened portion is obtained by attaching a widening excavator having a widened excavating blade configured to be able to expand and contract to the tip of the excavating rod, expanding the widened excavating blade at an arbitrary location, and rotating the excavating rod. Can be created by expanding digging.

As such a widening excavator, for example, there is a widening excavator disclosed in Japanese Patent Application No. 2004-26191 as one by the applicant of the present application.
As shown in FIG. 6 or FIG. 7, this widening excavator is provided with a widening excavation blade 4 via a swing shaft 3 on a excavation rod 2 provided with an excavation blade 1, and the rotation direction of the excavation rod 2 is changed. The widening excavation blade 4 is enlarged by changing the diameter, and the swing shaft 3 is provided with an inclination (θ1) with respect to the rotation axis L of the excavation rod 2 and the widening excavation blade 4 is closed. In this state, the base end of the widening excavation blade 4 is bent so as to be positioned along the longitudinal direction of the rotary shaft of the excavation rod 2, and is attached to the swing shaft 3, and widening excavation is performed with the widening excavation blade 4 opened. The tip end side of the blade 4 extends outside the excavation blade 1.
In addition, these widening excavation apparatuses are equipped with the widening excavation apparatus in the front-end | tip part of the excavation rod 2 penetrated in the hollow pipes 7, such as a steel pipe, as an example as a soil cement synthetic pile construction apparatus, Is provided with a stabilizer 8 for preventing the central axis of the excavation rod 2 and the hollow tube 7 from being eccentric.

  By the way, in such a widening excavator, by changing the rotation direction of the excavating rod, the diameter of the widened excavating blade is expanded using contact with excavated soil. In this case, it is conceivable that the vicinity of the widening excavation blade is integrated into a cylindrical shape by clay, and the widening excavation blade does not open even when the operation is expanded.

  In view of the problems of the widening excavator of the above-mentioned previous application, the present invention expands the widening excavating blade easily and reliably even when the vicinity of the widening excavating blade is integrated into a cylindrical shape by the clay of the excavation layer. It is another object of the present invention to provide a widening excavator that can support the excavation biting force at the tip of the widened excavating blade.

  In order to achieve the above object, the widening excavator of the first aspect of the present invention is provided by disposing a widening excavating blade on a excavating rod provided with an excavating blade via a swing shaft and changing the rotation direction of the excavating rod. In the widening excavator configured to widen the diameter by opening the widened excavating blade, a spring for biasing the widened excavating blade in the opening direction is provided.

  In order to achieve the same object, the widening excavator according to the second aspect of the present invention arranges the widening excavation blade through the swing shaft on the excavation rod provided with the excavation blade, and changes the rotation direction of the excavation rod. In the widening excavator configured to open the widened excavating blade to expand the diameter, a plurality of widened excavating blades are provided with an interlocking member that interlocks each widened excavating blade.

  According to the widening excavator of the first aspect of the invention, the widening excavation blade is disposed on the excavation rod provided with the excavation blade via the swing shaft, and the widening excavation blade is opened by changing the rotation direction of the excavation rod. In the widening excavator adapted to expand the diameter, by providing a spring for biasing the widened excavating blade in the opening direction, even when the vicinity of the widened excavating blade is integrated into a cylindrical shape by the clay of the excavation layer, The diameter of the widened excavation blade can be expanded easily and reliably by the force of the spring.

  According to the widening excavator of the second aspect of the invention, the widening excavation blade is disposed on the excavation rod provided with the excavation blade via the swing shaft, and the widening excavation blade is opened by changing the rotation direction of the excavation rod. In the widening excavator designed to expand the diameter, multiple interlocking members that link each widening excavation blade are bridged over multiple widening excavation blades, so that multiple widening excavation blades can be installed regardless of the influence of soil quality or earth pressure. By enlarging the diameter so as to synchronize, even if the vicinity of the widening excavation blade is integrated into a cylindrical shape by the clay of the excavation layer, the diameter of the widening excavation blade can be easily and reliably expanded by the action of the interlocking member. In addition, a plurality of widened excavating blades can be uniformly expanded in diameter. And since the diameter of a widening excavation blade can be expanded uniformly, a excavation rod can be rotated without eccentricity.

  Hereinafter, embodiments of the widening excavator of the present invention will be described with reference to the drawings.

1 to 3 show a first embodiment of the widening excavator of the present invention.
In this widening excavator, the widening excavation blade 4 is disposed on the excavation rod 2 on which the excavation blade 1 is disposed via the swing shaft 3, and the rotation direction of the excavation rod 2 is reversed from the normal rotation direction of the excavation blade 1. By changing the rotation direction, the widened excavating blade 4 is opened and expanded in diameter. A spring 5 is provided to bias the widened excavating blade 4 in the opening direction, and a pair of left and right widened excavations are provided. Interlocking members 6 that link the widening excavation blades 4 are bridged over the blades 4.

The excavation blade 1 is fixed to the tip of the excavation rod 2 and excavates a pile hole with a constant excavation diameter.
The widening excavation blade 4 has a pair of swing shafts 3 on the left and right of the excavation rod 2, and the pair of left and right widening excavation blades 4 are pivotally supported by these swing shafts 3 via a boss 41. Has been.
In this embodiment, the oscillating shaft 3 is provided in parallel with the rotating shaft of the excavating rod 2, and the oscillating range of the widened excavating blade 4 is closed so as to be within the excavating diameter of the excavating blade 1 when the diameter is reduced. When the diameter is expanded, it opens all the way to the left and right and stops by contacting a stopper (not shown).

In this embodiment, the spring 5 is a torsion spring wound around a shaft 31 coaxial with the swing shaft 3, and one end of the torsion spring extends from the excavation rod 2 and the other end extends from the widened excavation blade 4. For example, a torque of 50 kg · m to 100 kg · m is applied to the widened excavation blade 4.
In addition, the operating range of the torsion spring is about 100 to 200 mm with respect to the excavation diameter. For example, when the excavation diameter of the excavation blade 1 is 700 mm, the widened excavation blade 4 on the left and right sides has an excavation diameter of 900 mm to 1100 mm. To act during diameter expansion.
The torsion spring always urges the widening excavation blade 4 in the opening direction. However, when the excavation blade 1 rotates in the forward direction, the resistance of the excavating soil acts against the spring force of the torsion spring, and the widening excavation is performed. The blade 4 is reduced in diameter so that it falls within the range of the excavation diameter of the excavation blade 1.

Although the interlocking member 6 is not particularly limited, in this embodiment, the interlocking member 6 is composed of a ring-shaped wire installed on the boss 41 of the pair of widening excavation blades 4, and the wire is a rocker of the widening excavation blade 4. The fixing points 61 are fixed to the bosses 41 with bolts or the like as long as they do not affect the movement.
Usually, the widening excavator has two widening excavating blades 4 and it is ideal that the two widening excavating blades 4 move in synchronization during the diameter expansion operation.
Since the widening excavator of the previous application did not have the interlocking mechanism as described above, the two widening excavation blades sometimes did not synchronize due to the influence of soil quality and earth pressure when expanding the diameter. In the example, the diameter of the plurality of widened excavating blades 4 can be increased so as to synchronize, whereby the excavating rod 2 can be rotated without being eccentric.
The wire constituting the interlocking member 6 is formed in a ring shape as shown in the present embodiment, and, for example, as shown in the modification of the first embodiment shown in FIG. The end fitting 62 can be fitted into a groove 41a formed in the boss 41 of the wide excavation blade 4 and fixed by a stopper 63 from above.
In addition to the wire, the interlocking member 6 may be a linear member such as a chain or a belt-like member such as a flat belt.
Although not shown, a groove-like cut can be formed on the surface of the boss 41 or the excavation rod 2 with which the interlocking member 6 such as a wire is slidably contacted. Thereby, the shift of the interlocking member 6 can be prevented, and the amount of protrusion of the interlocking member 6 from the surface of the boss 41 or the excavation rod 2 can be reduced or eliminated, thereby smoothly moving the excavated sediment and increasing the excavation efficiency. In addition, it is possible to prevent the interlocking member 6 from being worn.

FIG. 5 shows a second embodiment of the widening excavator of the present invention.
In this widening excavator, the excavating blade 1 is disposed at the tip of the excavating rod 2, and the widened excavating blade 4 is disposed on the excavating rod 2 above the rocking shaft 3 so that the rotation direction of the excavating rod 2 is increased. Is changed from the normal rotation direction of the excavation blade 1 to the reverse rotation direction so that the diameter of the widening excavation blade 4 is increased, and the rotation direction of the excavation rod 2 is changed from the reverse rotation direction of the excavation blade 1 to the normal rotation direction. The widened excavation blade 4 is reduced in diameter by conversion.

  In this case, the rocking shaft 3 of the widening excavation blade 4 is provided at a predetermined angle with respect to the rotation shaft of the excavation rod 2 and the longitudinal direction of the rotation shaft of the excavation rod 2 with the widening excavation blade 4 closed. The base end portion of the widening excavation blade 4 is bent so as to be positioned on the inner side of the excavation diameter of the excavation blade 1, and is pivotally attached to the swing shaft 3, and the widening excavation blade 4 is opened. In the state, the distal end side of the widening excavation blade 4 is extended outside the excavation diameter of the excavation blade 1.

  In the second embodiment, in the widening excavator, a spring 5 for biasing the widened excavating blade 4 in the opening direction is provided, and each widened excavating blade 4 is arranged with respect to the widened excavating blade 4 provided on the left and right sides. The interlocking member 6 to be interlocked is bridged.

As in the first embodiment, the spring 5 is a torsion spring wound around a shaft 31 coaxial with the swing shaft 3, one end of the torsion spring being the excavation rod 2 and the other end being the widened excavation blade 4. And a constant torque is applied to the widened excavation blade 4.
Further, the operating range of the torsion spring is about 100 to 200 mm with respect to the excavation diameter, and when the excavation blade 1 rotates forward, the resistance of the excavation soil or the like acts against the spring force of the torsion spring, The widened excavation blade 4 is reduced in diameter so as to be within the excavation diameter range of the excavation blade 1.

  Similarly to the first embodiment, the interlocking member 6 is formed of a ring-shaped wire installed on the boss 41 of the pair of widening excavation blades 4, and the wire does not affect the swinging of the widening excavation blades 4. In a range, each boss 41 is fixed at a fixing point (not shown) via a bolt or the like.

Thus, the widening excavator of the present embodiment has the widening excavating blade 4 disposed on the excavating rod 2 on which the excavating blade 1 is disposed via the rocking shaft 3, and the rotation direction of the excavating rod 2 is changed. In the widening excavator that opens the excavation blade 4 and expands the diameter, the spring 5 that biases the widening excavation blade 4 in the opening direction is provided, so that the vicinity of the widening excavation blade 4 is cylindrical due to the clay of the excavation layer. Even when integrated, the widened excavation blade 4 can be easily and reliably expanded in diameter by the force of the spring 5.
Then, by linking an interlocking member 6 for interlocking each widening excavation blade 4 to a plurality of widening excavation blades 4, the plural widening excavation blades 4 can be synchronized and spread evenly regardless of the influence of soil quality or earth pressure. The excavation rod 2 can be rotated without being eccentric.

  As mentioned above, although the widening excavator of this invention was demonstrated based on several Example, this invention is not limited to the structure described in the said Example, The structure described in each Example is combined suitably. For example, as shown in FIG. 7, the configuration can be changed as appropriate without departing from the scope of the invention, such as being applicable to a widening excavator that opens a widening excavation blade from top to bottom.

  The widening excavator of the present invention can be easily and surely expanded in diameter even when the vicinity of the widening excavation blade is integrated into a cylindrical shape by the clay of the excavation layer, so that it can be applied to the foundation of a building. Embedded piles and cast-in-place concrete piles that have an expanded excavation or a partially enlarged diameter part, and that have been expanded after the construction of the piles and cast-in-place concrete piles. In addition, it can be suitably used for other excavation devices.

The 1st Example of the widening excavation apparatus of this invention is shown, (a) is a front view at the time of diameter reduction, (b) is the bottom view, (c) is the top view. The widening excavator of the Example is shown, (a) is a front view when the diameter is reduced, (b) is a cross-sectional view taken along the line AA of (a), and (c) is an A- when the diameter is enlarged (a). FIG. It is a front view of 2nd Example of this. The widening excavator of the Example is shown, (a) is a front view in the middle of diameter expansion, (b) is the bottom view, (c) is the same plan view, (d) is a front view during diameter expansion, (e ) Is a bottom view thereof, and (f) is a plan view thereof. The modification of 1st Example of the widening excavator of this invention is shown, (a) is a top view at the time of diameter reduction, (b) is a top view at the time of diameter expansion, (c) is description of an interlocking member (wire). FIG. The 2nd Example of the widening excavation apparatus of this invention is shown, (a) is a front view, (b) is a top view. It is a front view which shows an example of the widening excavation apparatus of a previous application. The other example of the widening excavator of a previous application is shown, (a) is a top view, (b) is a front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavation blade 2 Excavation rod 3 Oscillating shaft 31 Shaft 4 Widening excavation blade 41 Boss 41a Groove 42 Spring receiving bar 5 Spring 6 Interlocking member (wire)
61 Fixing point 62 End bracket 63 Fastener

Claims (2)

  In the widening excavator in which the widening excavation blade is disposed on the excavation rod provided with the excavation blade via the swing shaft, and the diameter of the widening excavation blade is increased by changing the rotation direction of the excavation rod. A widening excavator characterized in that a spring for biasing the widened excavating blade in the opening direction is provided.   In the widening excavator in which the widening excavation blade is disposed on the excavation rod provided with the excavation blade via the swing shaft, and the diameter of the widening excavation blade is increased by changing the rotation direction of the excavation rod. A widening excavator characterized in that an interlocking member for interlocking each widening excavation blade is spanned between a plurality of widening excavation blades.

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