JPH0821175A - Excavator for foundation work of building - Google Patents

Abstract

PURPOSE:To excavate the foundation pit of a building efficiently by mounting a spiral excavating blade on the outer circumference of a cylindrical body, in which a front end is opened, movably fitting the cylindrical body to a previously driven foundation pile, turning the cylindrical body and excavating the ground in the periphery of the pile. CONSTITUTION:When a pit for installing the footing of a building is dug around a foundation pile 4 driven into the ground, an excavator 1 with a spiral blade 3 having an excavating edge 6 and guide edges 7 on the outer circumference of a hollow shaft 2 is fitted movably on a pile head. The excavator 1 is rotated, the ground in the periphery of the pile 4 is excavated in specified depth, and the pit having a large diameter is formed. When the pit of the footing of the building is excavated by a power shovel, etc., the pile 4 is not a hindrance. Accordingly, a foundation pit can be dug out efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digging device for digging a hole around a foundation pile driven into the ground to provide a foundation for a building.

[0002]

2. Description of the Related Art In order to set up a foundation for a building, after driving a foundation pile into the ground with a building column car, digging around the pile to the depth at which the foundation should be provided, and cutting the exposed upper part (caps) of the pile, The foundation is provided in the hole.

[0003]

Conventionally, a hole for providing a foundation has been dug with a shovel car or the like. However, when a hole is dug around a foundation pile with an shovel car or the like, it takes time because the pile is an obstacle. However, the diameter of the hole becomes larger than necessary, and it takes time to backfill the hole after the foundation is provided.
In addition, the cost of introducing a shovel car is high and the construction cost is high.

An object of the present invention is to provide an excavating device capable of easily excavating a hole having a necessary and sufficient diameter for providing a foundation around a foundation pile.

[0005]

Means and Embodiments for carrying out the present invention are as follows.

<Means> A rotary shaft having spiral blades on the outer periphery and a connecting portion for connecting to the rotation driving means formed on the upper portion is a tubular shape having an opening at the lower end and is preliminarily driven into the ground. Consists of an inner diameter that fits into the stigma.

<Embodiment 1> On the outer periphery of the rotating shaft near the lower end in the above means, a vertical blade continuing from the lower edge of the blade is provided in a protruding manner.

[0008]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show a front view, a plan view and a bottom view, respectively, of an excavating device according to the present invention. In this excavating device 1, blades 3 are spirally provided on the outer circumference of a rotary shaft 2.

Therefore, the rotary shaft 2 of the excavator according to the present invention.
Has a cylindrical shape with an open lower end, and its inner diameter is slightly larger than the outer diameter of the foundation pile 4 that has been driven into the ground in advance, and the rotary shaft 2 is fitted to the stake of the foundation pile 4. I can do it.

A small-diameter head 5 is formed on the upper portion of the rotary shaft 2 as a connecting portion with a later-described rotary driving means, and claws 5a and 5a engaging with the rotary driving means are formed on the outer periphery of the upper end of the small-diameter head. Is provided. Reference numeral 5b in the drawing denotes a hole for inserting the lock pin so that the excavator does not come off from the rotation driving means.

An excavating blade 6 for excavating the ground is provided at a required angle according to the inclination of the blade on the lower end edge of the blade 3 provided on the outer periphery of the rotating shaft 2, and the lower end edge of the rotating shaft 2 is provided. A guide blade 7 is provided on the bottom of the guide blade 7 for making the rotary shaft bite into the ground.

As shown in FIG. 4, the excavation device 1 of this embodiment is used by attaching it to a building column car 8 into which, for example, a steel pipe pile is rotationally press-fitted, and is provided at the tip of an arm 9 of the building column car 8. The reduction gear 10 thus obtained is used as the rotation driving means of the excavator.

5 and 6 show a connecting portion between the excavating device 1 and the reduction gear 10. The reduction gear 10 is provided with a connection adapter 11. This connection adapter is for connecting the head of the pile and the reduction gear when the foundation pile is rotationally pressed in, and is used as it is for the excavator.

The connection adapter 11 is a disk-shaped member having a diameter that is substantially the same as the outer diameter of the small-diameter head 5, and a non-circular projection for fitting the reduction gear 10 is provided at the center of the upper surface.
Further, outer guides 11a, 11a that engage with the claws 5a, 5a of the small-diameter head 5 are provided on the outer peripheral surface.

An inner guide 13 is hung at the center of the lower surface of the adapter 11, and a hole 13a is formed in the inner guide 13 in the diametrical direction, and a hole 5b for communicating the small-diameter head 5 in the diametrical direction. The lock pin 14 for preventing the slip-out is inserted from above.

When the reduction gear 10 is rotationally driven while the arm 9 of the overhead cart 8 is tilted downward, the outer guides 11a, 11a of the connecting adapter 11 cause the claws 5a, 5 of the small-diameter head 5 to move.
The rotary shaft 2 is rotated by being caught by a.

The excavator 1 excavates the ground 16 by the excavating blade 6 provided at the lower end edge of the blade 3, and the guide blade 7 provided at the lower end of the rotary shaft causes the rotary shaft 2 to bite into the ground. The excavated earth and sand are carried upward along the blades 3 and discharged, and the area around the foundation pile 4 is excavated.

Next, a specific example of the procedure for providing the foundation of a building using the excavating device according to the present invention will be described with reference to FIGS. 7 (a) to 7 (d). (a) The foundation pile 4 is rotationally press-fitted with a column car, and the lower end of the pile is driven to the support ground 15. (b) The upper end of the foundation pile 4 is covered with the rotary shaft 2 of the excavation device 1 and fitted, and a hole having a depth for providing a foundation is excavated around the pile 4. (c) Remove the rotating shaft 2 from the pile 4 and cut the stigma of the pile protruding in the hole 16a. (d) The top of the pile is covered with a lid 17 such as an iron plate, and the foundation 1 is placed on it.
8 is provided and the base is filled with mortar 19 and earth and sand.

In the above-mentioned embodiment, the excavating blade 6 provided on the lower end edge of the blade 3 excavates the ground around the foundation pile 4, but the ground around the pile is, for example, clay or the like, which is particularly soft. If so, an excavator as shown in FIGS. 8 and 9 is used.

The excavator 20 has a blade 24 having a lateral width on the outer periphery of the cylindrical rotary shaft 21 having an open lower end near the lower end.
The vertical blades 22 having the same width as that of the rotary shaft 21 are provided so as to project to the left and right of the rotary shaft 21. The vertical blades 22 have a central recess 22a whose inner surface follows the outer circumference of the rotary shaft 21 and a fixed plate 23.
The rotary shaft 21 is sandwiched between and by bolts 23a and 23a, and the upper edge of one side of the vertical blade 22 is continued to the lower edge of the blade 24.

In this embodiment, when the rotary shaft 21 is rotated and press-fitted downward, the vertical blades 22 push the clay outward and upward of the apparatus, and the clay pushed outward is pushed horizontally. The clay that has been solidified and pushed upward is carried upward along the upper surface of the blade 24 and discharged out of the hole.

[0022]

Since the excavating device according to the present invention has the above-mentioned structure, the following effects can be obtained. Since the rotating shaft has a cylindrical shape with a lower opening and is configured to be used by fitting it to the stigmas of a foundation pile that has been driven into the ground beforehand, the foundation pile does not get in the way when digging holes, It is possible to easily dig a hole having a diameter that is necessary and sufficient to provide the hole.

Further, when the foundation pile is a rotary press-fit pile, the rotary power of the excavator can be directly used as the rotary power for placing the rotary press-fit pile, and a shovel car or the like can be used. Since it is not necessary, it is possible to reduce the construction cost.

[Brief description of drawings]

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

FIG. 2 is a plan view of the same.

FIG. 3 is a bottom view of the above.

FIG. 4 is a diagram showing a usage state of the excavator.

FIG. 5 is a partially cutaway front view showing a connection state between the excavator and the rotation driving means.

FIG. 6 is a plan view of the above.

FIG. 7 is a process diagram showing a construction procedure for foundation work.

FIG. 8 is a front view showing another embodiment of the excavating device according to the present invention.

FIG. 9 is a bottom view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavator 2 Rotating shaft 3 Blade 4 Foundation pile 5 Small diameter head 6 Excavation blade 7 Guide blade 8 Construction column car 9 Arm 10 Reduction gear 11 Connection adapter 11a Outer guide 12 Connection protrusion 13 Inner guide 14 Lock pin 15 Support ground 16 Ground 16a Hole 17 Lid 18 Foundation 19 Mortar 20 Excavator 21 Rotational axis 22 Vertical blade 23 Fixed plate 24 Blade

Claims (1)

[Claims] 1. A stilt of a foundation pile, which has a cylindrical shaft having a spiral blade on the outer periphery and a connecting portion for connecting to a rotary driving means formed on the upper portion and which has a lower end opening and is preliminarily driven into the ground. An excavation device for foundation work of a building, which is constructed with an inner diameter that fits into the.