JP3057484B2 - Pile driving device for concrete pile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile driving device for a concrete pile which is a foundation of a building.

[0002]

2. Description of the Related Art Concrete piles, which are the foundation of buildings,
A vertical drill hole is drilled in the ground with a screw, and mortar is filled in the drill hole before being buried in the drill hole.

[0003]

The mortar solidifies together with the concrete pile in the borehole and supports the weight of the building. Therefore, it is desirable that the mortar solidified in the borehole has as large a supporting strength as possible.

Accordingly, an object of the present invention is to provide a pile driving device for a concrete pile capable of forming a mortar capable of securing a large supporting strength in an excavation hole.

[0005]

SUMMARY OF THE INVENTION A pile driving device for a concrete pile according to the present invention includes a screw shaft for excavating the soil and a head connected to a lower end of the screw shaft. projecting the fixed claw and a variable claw projecting, have a rotor projecting length increases open when the variable pawl projecting length is shortened also reverse rotation closed when the screw shaft rotates in the forward direction, Again before
Concrete pile holder consisting of a cylinder into which the head is inserted
It has a holding jig, and this jig has a lower claw of the head.
Mounted in a high position that protrudes downward and a low position where this claw is hidden
To be able to use this fixture with a concrete pile head
Forming an engaging portion for detachably engaging the
Ru der obtained by forming the blade portion to the lower surface of the body.

[0006]

[0007]

[0008]

[0009]

According to the present invention, the diameter of the excavation hole can be partially increased by changing the direction of rotation of the screw from forward rotation to reverse rotation to increase the protruding length of the variable claw. Therefore, the mortar solidified in the excavation hole has irregularities in the depth direction of the excavation hole, and the supporting strength of the building becomes extremely large. Also lower the head and dig in the soil
When drilling a drill hole in
Better not to hinder the excavation due to the claw of the head
And lower the jig following the claw of the head.
The inner wall of the borehole can be finished more cleanly
You. Drilling of concrete piles after excavation of drilled holes was completed
When embedding in a hole, lower the jig
Can be used as cleat pile holding means. Jig head
The drilling hole that the claw excavated while following the claw and descending
The inner wall surface of the borehole is shaved with a blade to clean the inner wall surface of the borehole.
Can be raised.

[0010]

[0011]

[0012]

[0013]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1A is a front view of a screw of a concrete pile driving device, FIG. 1B is a perspective view of the concrete pile holding jig, and FIG. Plan sectional view of the state attached to
2 (a) and 2 (b) are front views of a screw equipped with the concrete pile holding jig, FIG. 3 (a) is a perspective view of a fixed claw, and FIGS. 3 (b) and 3 (c) are views of a variable claw. FIG. 4 is a perspective view of the head of the concrete pile, and FIG. 5 is an explanatory view of a pile driving process of the concrete pile.

First, the structure of a screw for excavating underground will be described. In FIG. 1A, a screw 1 is configured such that fixed claws 3 and variable claws 4 are provided on a screw shaft 2 alternately at a pitch so as to protrude laterally. The head 5 is connected to the lower end of the screw shaft 2. The head 5 has a claw 6 at its lower portion, and the claw 6 excavates the soil. On both sides of the head 5, a vertical elongated rod-shaped mounting body 7
Is installed. Pin holes 8 in the upper and lower parts of the mounting body 7
a, 8b are formed.

1 (b) and 1 (c), the concrete pile holding jig 10 is formed of a cylindrical body. Jig 10
A saw-shaped blade 11 is formed on the lower surface of the device, and a key-shaped engaging portion 12 is cut out. A mounting piece 13 is mounted on the upper inner surface of the jig 10. Mounting piece 13
Are a set of two sheets, and are mounted at two locations facing each other. As shown in FIG. 1 (c), the mounting bodies 7 on both sides of the head 5 are inserted between the mounting pieces 13, and the pin holes 8a or 8b are inserted.
The jig 10 is inserted into the head 5 by inserting the pin 14 into the
Attached to.

FIG. 2A shows a state in which the pin 14 is inserted into the upper pin hole 8.
a, the jig 10 is mounted at a high position of the head 5, and in this state, the claw 6 of the head 5 is
Slightly projecting below the lower surface of the. FIG. 2 (b)
This shows a case in which the pin 14 is inserted into the lower pin hole 8 b and the jig 10 is mounted at a low position of the head 5. In this state, the blade 11 of the jig 10 is lower than the claw 6 of the head 5. Project to As will be described later, the screw 1 excavates in the soil in the state of FIG. 2A, and embeds the concrete pile in the excavation hole in the state of FIG. 2B.

Next, referring to FIG. 3, the fixed claw 3 and the variable claw 4
Will be described. In FIG. 3A, the fixed claw 3 is formed by twisting a plate. One end of the fixed claw 3 is fixed to the screw shaft 2 and protrudes laterally. L1
Is its protruding length. 3 (b) and 3 (c), the variable pawl 4 has a base 4a formed by twisting a plate body, and a mount 4b having a U-shaped cross section is fixed to the tip of the base 4a. At 4d, it is formed so as to be rotatable in the horizontal rotation direction. One end of the base 4a is fixed to the screw shaft 2 and protrudes laterally.

FIG. 3B shows a case where the screw shaft 2 is rotated forward (arrow A). At this time, the rotor 4c is in a posture orthogonal to the longitudinal direction of the base 4a,
The protruding length L2 of the variable claw 4 becomes shorter. This protrusion length L2 is
It is almost the same as the protrusion length L1 of the fixed claw 3. FIG.
(C) shows the case where the screw shaft 2 is rotated in the reverse direction (arrow B). In this state, the rotor 4c horizontally rotates about the pin 4d by 90 ° due to the rotational centrifugal force, and the protruding length L3 of the variable claw 4 increases.

Next, the concrete pile will be described with reference to FIG. The concrete pile 15 is a polygonal pillar or a cylinder, and a pin 16 is horizontally protruded from the head thereof.
As shown in FIG. 2B, the concrete pile 15 is detachably held on the jig 10 by engaging the pin 16 with the engaging portion 12 of the jig 10.

This pile driving device for concrete piles is constructed as described above. Next, a concrete pile driving method will be described with reference to FIG. 5 (a), (b),
(C), (d), (e), and (f) are shown in the order of steps.

First, as shown in FIG. 5A, the upper end of the screw 1 is connected to the power unit 17, and the excavation hole 20 is excavated while the screw 1 is rotated forward (arrow A).
At this time, the jig 10 is mounted at a high position of the head 5 (see also FIG. 2A), and the claw 6 protrudes below the jig 10 to excavate in the soil. Also, the jig 10 descends while rotating while following the claw 6 while the head 5 excavates and descends, and finishes and builds up the inner wall surface of the excavation hole 20. In this case, the jig 10 descends while rotating.
In step 1, the inner wall surface of the excavation hole 20 excavated by the blade 6 of the head 5 is cleanly removed. The power unit 17 is connected to the upper end of a crane of a working machine (not shown) such as a crane truck or a pile driver, and rotates the screw 1 forward and backward and moves up and down.

FIG. 5B shows a state in which the excavation of the excavation hole 20 has been completed. During excavation, the mortar 21 is discharged from the lower end of the head 5 and the excavation hole 20 is
Filled with. During excavation, the fixed claw 3 and the variable claw 4
Has a twisted shape, so that the drilling hole 2
Excavation can be performed while sufficiently stirring the mortar 21 discharged to zero.

When the excavation hole 20 has been excavated to a predetermined depth, the screw 1 is rotated in the reverse direction (arrow B). Then, as shown in FIG. 5C, the rotor 4c rotates, and the protrusion amount of the fixed claw 4 becomes longer (the state of FIG. 3C). Therefore, a plurality of enlarged diameter portions 22 are formed in the excavation hole 20 by the rotor 4c at intervals in the vertical direction. In this case, if the operation unit such as a crane truck is operated to cause the screw 1 to slightly move up and down (arrow Z), the rotor 4c rotates while moving up and down, and the width of the enlarged diameter portion 22 in the depth direction. D can be increased.

After the enlarged diameter portion 22 is formed as described above, the screw 1 is pulled up while rotating forward (FIG. 5D). In this case, the protruding length L2 of the variable claw 4 becomes as shown in FIG. 3A, and the screw 1 can be pulled up from the excavation hole 20 without difficulty. Also in this case, since the base 4a of the fixed claw 3 and the variable claw 4 has a twisted shape, the screw 1 can be pulled up while rotating the screw 1 forward and sufficiently stirring the mortar 21. Moreover, in this case, the amount of earth removal caused by the lifting (the amount of soil and mortar being scraped out of the excavation hole 20 to the surface of the ground when the screw 1 is raised) can be reduced.

Next, as shown in FIG. 5 (e), the head of the concrete pile 15 is held by the jig 10, and the concrete pile 15 is lowered into the excavation hole 20 and buried while rotating forward. In this case, the jig 10 is mounted at a low position of the head 5 as shown in FIG. 2B, and the pins 16 of the concrete pile 15 are locked by the engagement portions 12.

When the concrete pile 15 is completely embedded in the excavation hole 20, the jig 10 is detached from the pin 16 and the screw 1 is raised (FIG. 5 (f)). From the above,
The pile driving work of the concrete pile 15 is completed. Drilling hole 2
The mortar 21 in the solidified concrete 0
5, the mortar 21 has the enlarged diameter portion 22, so that a large supporting strength can be obtained.

[0027]

According to the present invention, the diameter of the enlarged portion can be partially formed in the excavation hole by changing the rotation direction of the screw from the normal rotation to the reverse rotation to increase the protruding length of the variable claw. . Therefore, the mortar solidified in the excavation hole has irregularities in the depth direction of the excavation hole, and the supporting strength of the building becomes extremely large. Also lower the head
When drilling a drill hole in the soil, raise the jig
By doing so, it will not interfere with excavation due to the claw of the head
And move the jig back down to the claw of the head.
This makes it possible to clean the inner wall of the borehole
it can. In addition, concrete stakes will be
When embedding in a borehole, lower the jig
It can be used as holding means for concrete piles. Also jig
As the claw excavates while following the head claw and descending
The inner wall surface of the drilled hole is cut with a blade to
You can finish it.

[0028]

[0029]

[0030]

[Brief description of the drawings]

FIG. 1A is a front view of a screw of a concrete pile driving device. FIG. 1B is a perspective view of a concrete pile holding jig. FIG.

FIG. 2A is a front view of a screw provided with a jig for holding a concrete pile. FIG. 2B is a front view of a screw provided with a jig for holding a concrete pile.

3A is a perspective view of a fixed claw, FIG. 3B is a perspective view of a variable claw, and FIG.

FIG. 4 is a perspective view of the head of a concrete pile.

FIG. 5 is an explanatory view of a pile driving process of a concrete pile.

DESCRIPTION OF SYMBOLS 1 Screw 2 Screw shaft 3 Fixed claw 4 Variable claw 4a Base 4b Attachment 4c Rotor 5 Head 6 Claw 10 Concrete holding jig 11 Blade 12 Engagement part 15 Concrete pile 20 Drilling hole 21 Mortar 22 Enlarged part

Continuation of front page (56) References JP-A-4-216716 (JP, A) JP-A-5-33342 (JP, A) JP-A-7-310313 (JP, A) JP-A-7-127055 (JP) , A) Japanese Utility Model Hei 2-132734 (JP, U) Japanese Utility Model Sho 58-69034 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 5/34-5/50

Claims (1)

(57) [Claims] 1. A screw shaft for excavating the soil,
And a head connected to the lower end of the screw shaft, the screw shaft, projecting a soluble Hentsume that protrudes laterally, the variable pawl protruding length closed when the screw shaft rotates forward short will also have a rotor projecting length open longer when the reverse rotation, also the head
For holding concrete piles consisting of a cylinder into which
Tool, and the jig at the lower part of the head projects downward.
It can be installed in the high position where it comes out and the low position where this nail is hidden
And attach and detach the head of the concrete pile to and from this jig.
Forming an engaging portion to be engaged with the lower surface of the cylindrical body;
A pile driving device for a concrete pile, characterized in that a blade portion is formed in the pile.