JP2590990Y2 - Hollow pile for drilling - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow pile for digging used in a digging method.

[0002]

2. Description of the Related Art Conventionally, a hollow pile 3 for excavation used in an excavation method.
No. 0, a cylindrical friction cutter 31 was fixed to the outer wall at the tip end in order to reduce friction between the pile hole wall and the outer wall of the pile and facilitate the insertion of the pile into the pile hole (FIG. 4 ). Also,
The tip of this friction cutter formed a projection 32 projecting downward from the bottom of the pile.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
Since the friction cutter 31 covers the entire periphery of the outer wall of the pile tip, when the pile is lowered in the pile hole, the problem that the liquid around the pile in the pile hole hardly enters between the side wall 20 of the pile and the side wall 30b of the pile. There was a point. Further, when the pile is lowered in the expanded bottom portion of the pile hole, there is a problem that the root compaction liquid does not easily enter the hollow portion 30a of the pile.

[0004]

However, this invention solves the former problem because the friction cutter pieces are fixed at predetermined intervals or grooves are provided in the friction cutter. In addition, since the leading end guide plate is attached to the friction cutter piece or the friction cutter, the latter problem is solved.

That is, in the present invention, a friction cutter piece is fixed at a predetermined interval to an outer wall of a tip of a hollow pile used in the excavation method , and the friction cutter piece is lowered from the tip.
Projecting in the direction of
At the same time, toward the center of the hollow pile,
It is a hollow pile for digging characterized by protruding a root compaction liquid guide plate .

Another invented is a hollow pile used in a digging method.
A groove extending over the entire length in the vertical direction on the surface
The fact that the friction cutter formed at the
A hollow piles for drilling in which the symptoms.

[0007]

[Function] When the pile is lowered into the pile hole, the pile periphery fixing liquid is sent upward from the gap between the adjacent friction cutter pieces or from the groove of the friction cutter, and is filled between the pile peripheral wall and the pile hole wall. You. Also, when the pile descends while rotating, the root compaction liquid is stirred by the tip guide plate,
The consolidation liquid is drawn toward the center of the pile and transported into the hollow part of the pile.

[0008]

Example 1 Based on FIGS. 1 and 2 illustrating the actual施例of this invention.

[0009] At the lower end of the hollow pile 1 used in the excavation method
A plate 2 is integrally fitted and fixed, and an end of the hollow pile 1
Three sheets bent on the side surface 3 of the plate 2 along the outer surface of the pile
During equal pretend action cutter pieces 4,4 at predetermined intervals
Secure with a gap. Friction cutter piece in the above
The gaps 6 and 6 are formed between 4 and 4. Also, friction
The lower ends of the cutter pieces 4, 4 project below the end plate 2.
7 are formed .

On the inner side 7a of the lower end protruding portion 7 of each of the friction cutter pieces 4, radially toward the center of the pile,
The flat roots solidifying liquid guide plates 8,8 projecting, the upper end of the root hardened liquid induction <br/> conductive plate 8, 8 fixed to the end plate 2, constituting the hollow pile 9 for medium Drilling ( Figure 1 ).

Next, the use of the hollow pile 9 for excavation based on the above embodiment will be described.

[0012] In the same manner as in the ordinary drilling method, the hollow pile 9 for drilling is used.
Auger (not shown) for drilling a pile hole in the hollow part
And, drilling Kuiana while injecting Kuishu fixative (cement milk) from the tip of the Kuiana drilling auger into the pile hole lowers the hollow pile 9 for medium drilling in Kuiana. At this time, the pile peripheral fixation liquid is sent upward from the gaps 6 and 6 and is filled between the peripheral wall 9 b of the pile and the pile hole wall 20. Next, when lowering the hollow stake 9 for digging in the expanded bottom portion 21 of the pile hole filled with the consolidation liquid, the hollow stake 9 for digging is lowered while rotating in the direction of the arrow 10, The pile consolidation liquid is stirred by the root consolidation liquid guide plates 8 and 8 and transferred into the hollow portion 9a of the pile.

[0013] In the embodiment, root solidified liquid guide plate 8 has a flat plate shape, FIGS. 2 (a) bent to one side (b), the and medium-drilling rotating direction of the hollow pile 9 ( With respect to (the direction indicated by the arrow 10), the shape may be twisted such that the distal end of the outer peripheral side 8a is on the front side (the proximal end of the inner peripheral side 8b is on the rear side). In this case, when the hollow pile 9a for drilling is lowered while rotating in a certain direction (the direction indicated by the arrow 10), the root compaction liquid can be more easily transferred to the hollow portion 9a of the pile. Further, in the above-described embodiment, the shape of the root compaction liquid guide plate 8 is square, but may be triangular.

In the above-described embodiment, the rooting liquid guide plate 8 is protruded from the friction cutter pieces 4, 4, but may be protruded from the end plate 2 of the pile. Furthermore, the end plate 2, the friction cutter 4, and the root compaction liquid guide plate 8 are formed in an integrated shape, and this is fitted to and fixed to the pile main body 1, or the pile main body 1 is centrifugally formed in a state where the pile main body is mounted. Thus, a hollow pile for digging can be integrally formed.

In the above embodiment, the other constructions of the friction cutter piece 4 and the pile main body 1 are the same as those of the first embodiment.

Further, in the above embodiment, projecting from the root solidified liquid guide plate 8 to the friction cutter piece 4, the lower end protrusion of the hollow pile cylindrical friction cutter drilling in the traditional shown in FIG. 4 of inward, toward the center of the pile, root compaction
The liquid guide plates 8 and 8 can be protruded (not shown).
No) In this case, there is no effect of filling the pile periphery fixing liquid between the pile peripheral wall and the pile hole wall, and the pile root fixing liquid is supplied to the pile hollow portion 9a.
Only has the effect of transferring to

[0017]

Embodiment 2 Next, referring to FIG. 3 illustrating another embodiment of this invention.

An end plate 2 is integrally fitted to and fixed to the lower end of the hollow pile main body 1 used for the excavation method, and a groove 12 having a predetermined length in the vertical direction (axial direction) from the end plate 2 to the lower end. 12 are formed. The upper edge 12a of the groove 12 is at least
The end plate 2 is formed to have a length that is located above the upper edge.

A bent portion 1 which bends a cylindrical body along the shape of the side surface of the end plate 2 of the hollow pile main body 1 and can be fitted in the groove 12.
The friction cutter 13 is formed by forming 4a and 14a over the entire length in the vertical direction. A groove 14 is formed on the surface of the friction cutter 13 by a bent portion 14a.

The end plate 2 of the hollow pile body 1 is provided with the groove 12
The friction cutter 13 is fitted and fixed so that the bent portion 14a fits with the bent portion 14a, thereby forming the hollow digging pile 15 (FIG. 3 ).

[0021] The the use of hollow pile 9 for drilling in this is based on examples, excavated Kuiana while injecting Kuishu fixative (cement milk) from the tip of the auger for pile holes drilled into the pile hole Medium The hollow pile 5 for excavation is lowered into the pile hole while rotating in the direction of arrow 10. At this time, the pile circumference fixing liquid is
It is sent upward from the gaps 16, 16 formed in 4, 12, and is filled between the pile peripheral wall 15 b and the pile hole wall 20.

In the above embodiment, similar to the first embodiment,
The rooting liquid guide plates 8, 8 may be protruded from the friction cutter 13.

[0023]

[Effects of the Invention] In this invention, since the friction cutter pieces are fixed at predetermined intervals or grooves are provided in the friction cutter, the pile can be easily lowered into the pile hole, and the pile periphery fixing liquid can be applied to the pile hole wall. Is filled in the pile peripheral wall, so that the frictional force between the pile peripheral wall and the pile hole wall can be increased. Also, the inside of the protrusion of the friction cutter piece
A fixing liquid guide plate having approximately the same height as the protruding portion is fixed toward the center of the empty pile, so that the fixing liquid can be easily transferred to the hollow portion of the pile quickly and easily. In addition, since the consolidation liquid is filled in the hollow portion, there is an effect that the supporting force at the tip of the pile can be increased.

[Brief description of the drawings]

[1] In real施例of this invention, is a cross-sectional view along line A-A of (a) <br/> front view omit part, (b) is (a).

FIG. 2 shows another embodiment of the present invention, in which (a) is partially omitted.
The front view, a sectional view taken along line B-B in (b) is (a).

FIG. 3 shows another embodiment of the present invention, in which (a) is partially omitted.
The front view, a sectional view taken along line C-C of (b) is (a).

4A and 4B are front views partially showing a conventional example of the present invention, and FIG. 4B is a cross-sectional view taken along line DD in FIG. 4A.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hollow pile main body 2 End plate 4 Friction cutter piece 6 Gap 8 Root consolidation liquid guide plate 9 Hollow pile for digging 12 Groove (pile) 13 Friction cutter 14 Groove (friction cutter) 15 Hollow pile for digging 16 Gap

Claims (2)

(57) [Scope of request for utility model registration] A friction cutter piece is fixed to an outer wall of a tip portion of a hollow pile used for a digging method at a predetermined interval , and
Protruding downward from the tip
Part, inside the protruding part, in the center of the hollow pile
The rooting liquid guide plate approximately the same height as the protrusion
A hollow pile for digging, characterized by being installed . 2. An outer wall at a tip end of a hollow pile used for a digging method,
Grooves are formed on the surface over the entire length in the vertical direction at predetermined intervals.
A hollow pile for digging, which is fitted with a traction cutter .