JPS6024797Y2 - Positioning device in drilling rig - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a positioning device for an excavation rig.

The part of the pile where the horizontal stress that causes a negative star is most concentrated is the pile head, and in order to make the head sticky, it is possible to enlarge the head of the pile.

An object of the present invention is to provide a positioning device for an excavator that can accurately excavate a small-diameter shaft pile hole at the center of the bottom of a pre-drilled expanded pile hole with good workability when constructing an expanded pile. It is in.

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, for example, a packet (not shown) is placed on the ground W.

), the papilla 1 of the expanded pile hole is excavated.

The outer casing 2 is dropped and fitted in close contact with the inner wall of the teat 1, and the upper end opening 2a of the outer casing is connected to the ground W.
protrudes slightly from the ground surface.

A small-diameter inner casing 3 is located at the shaft center inside the outer gauging 2.
is inserted with a gap between it and the outer casing 2.

The inner casing 3 has a guide means attached to its outer wall surface.

In this example, this guide means has three arms 4. ... are protruded in three stages at equal intervals, and at the tip of each piece is a roller 5. ... is attached to the inner wall surface of the outer casing 2 so as to be removable.

Each piece 4. ... allows the axial center of the inner casing 3 to coincide with the axial center of the outer casing 2, and the inner casing can be positioned at the axial center of the outer casing.

In addition, the outer casing 2 is attached to the upper opening edge of the inner casing 3.
A cover plate 6 is provided to cover the upper end.
A locking piece 6a provided on the outer periphery of the outer casing engages with the upper opening edge of the outer casing to more reliably close the upper opening 2a.

The center of the lid plate 6 is an upper end opening 3a of the inner casing 3.

Next, a method of using the positioning device of the present invention will be explained with reference mainly to FIGS. 3 to 6.

First, a hole head 1 with an enlarged diameter of a predetermined depth is excavated as an enlarged pile hole in the ground W using a packet or the like, and an outer casing 2 is inserted into this head.
(Figure 3).

Next, on the ground, align the axis of the inner casing 3 with the outer casing 2.
When the inner casing is inserted into the outer casing 2 after being aligned with the axis of the roller 5.・・・
The inner casing 3 is gradually inserted into the axial center of the outer casing (Fig. 4), and the inner casing is eventually inserted into the inner casing as shown in Fig. 1, and the outer casing 2
The upper end opening 2a is closed with a lid plate 6.

Thereafter, as shown in FIG. 5, for example, a tower (not shown) is opened from the upper end opening 3a of the inner casing 3.

) is inserted and pulled down to the bottom of the expanded pile hole 1, and then the earth drill 7 is driven to rotate to drill a small diameter shaft hole 1a.

When this earth drill 7 has excavated a predetermined amount, the operation of lifting the earth drill and removing soil is repeated, and the discharged soil is prevented from falling into the teat 1 by a cover plate 6.

When the shaft hole 1a has been excavated to a predetermined depth, the reinforcement cage 8 is inserted into the pile hole 1a in a cylindrical shape as shown in FIG. 6, and the inner casing 3 is pulled up. A reinforcing bar cage 9 is inserted into 1, concrete is poured, and the pile is constructed.

Note that the guide means of the inner casing 3 is not limited to the upper one; for example, the same effect can be obtained even if the tip of the arm 4 comes into contact with the inner wall surface of the outer casing 2; The one having a roller at the tip has the advantage that it can be taken in and out of the outer casing 2 smoothly.

As described above, according to the present invention, by using a positioning device, it is possible to accurately center and drill a small diameter shaft hole at the center of the bottom of the papilla of an expanded pile hole with good workability. The effect is enormous.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional view showing the positioning device of the present invention in use, and FIG.
The cross-sectional view taken along the line ■--■ in the figure and FIGS. 3 to 6 are explanatory diagrams showing each process of constructing a pile using the device of the present invention. 1... Papilla of expanded pile hole, 2... Outer casing, 2a... Upper end opening, 3...
・Inner casing, 3a...Top opening, 4...
... Arm, 5 ... Roller, 6 ... Lid plate.

Claims (2)

[Scope of utility model registration request] (1) An outer casing that can be inserted into the inner wall of the papilla of a pre-drilled expanded pile hole, an inner casing that can be inserted into the outer casing with a gap, and an inner casing that is attached to the outer wall surface of the inner casing. and a guide means for positioning the inner casing at the outer casing axis by having its tip abut against the inner wall of the outer casing, and a guide means provided at the upper opening edge of the inner casing to close the upper opening of the outer casing. A positioning device in an excavation rig, characterized in that the positioning device is equipped with a cover plate that can be used; (2) Utility model registration Scope of claim 1, wherein the guide means is an arm whose one end is attached to the inner casing and whose tip is provided with a roller that transfers the inner wall of the outer casing. Device.