JPS6168924A - Method of burying-in pile - Google Patents

Abstract

PURPOSE:To highly precisely and easily drive-in a pile, by a method wherein an auger rod is inserted into a casing tube, an excavating head is protruded from the lower end of a tube, and excavation is effected with the rod and the tube rotated in a reverse direction to each other. CONSTITUTION:Excavation is effected in a way that an auger rod 1 and a casing tube 6 are lowered as they are rotated in a reverse direction to each other. A burying hole 11 for a pile is excavated by an excavating head 3, and excavated soil 12 is agitated and crushed with the aid of agitating baldes 4 and 5. When the excavating head 3 is lowered down to a given depth, lowering of the auger rod 1 is stopped, and the casing tube 6 is rotated for lowering, and lowering of the casing tube is stopped when the tube is lowered down to the same depth as that of the auger rod 1. After the auger rod 1 is pulled off, a pile 13 is inserted into a burying hole 11 to engage the pile with the casing tube 6. Further, the pile 13 is pressed down by means of the auger rod 1, and the casing tube 6 is lifted up.

Description

[Detailed description of the invention] The present invention involves digging a hole in the planned site for embedding a pile, crushing the excavated earth and sand, and inserting a cylindrical pile into the crushed earth and sand in the hole. Conventionally, in this type of embedding method, an auger rod with a drilling head attached to the lower end and stirring blades around the circumference is placed in the area where the pile is to be embedded. It descends while rotating, excavates the buried hole with the drilling head, and excavates the earth and sand inside the buried hole with the stirring blade? After stirring and crushing and digging the embedding hole to a specified depth, the auger rod P is extracted from the embedding hole, and a cylindrical ready-made concrete tube is inserted into the crushed earth and sand in the embedding hole and buried. Insert into the insertion hole.

However, if the ground into which the auger rod is digging is weak or strong, the auger rod will not move straight but will bend in the direction of the weaker ground, making it impossible to dig a straight buried hole.

If the ground where the hole will be drilled is prone to collapse.

The wall surface of the embedding hole collapses, making it impossible to excavate the embedding hole P with a predetermined diameter.

That is, in the conventional method, when the ground where the pile is to be buried is heterogeneous or soft, it is difficult to embed the pile in a predetermined position with high precision.

An object of the present invention is to improve the conventional method having the above-mentioned drawbacks, and to provide a method for embedding piles in which the piles can be easily and accurately placed.

The present invention uses casing chew No. 1 that slides into the auger rod in order to improve the straight-travel performance of the auger rod and prevent collapse of the embedded hole.

That is, in the first invention, an auger rod with a drilling head attached to the lower end and a stirring blade attached to the periphery is inserted into a casing tube, and the auger rod P is concentric with the casing tube by the nl stirring blade slidably fitted into the casing tube. This pile embedding method is characterized by placing the excavation head in the casing tube, protruding from the lower end opening of the casing tube, and excavating while rotating the inner and outer auger rods and the casing tube in opposite directions.

In this embedding method, the casing tube fitted into the auger rod torsion excavates while rotating in the opposite direction, so it has good straight performance, the auger rod is difficult to bend in the weak direction of the ground, and the embedding hole is straight. It is easy to excavate. Moreover, since the casing tube is inserted into the embedding hole dug by the auger rod, the embedding hole is prevented from collapsing.

Therefore, the stake can be easily embedded with high accuracy.

Further, in the second invention, after digging the embedding hole to a predetermined depth with a cutter in the same manner as in the first invention, the auger rod is extracted leaving the casing tube in the embedding hole, and the cylindrical pile is removed. This is a pile embedding method that is characterized by inserting the pile into crushed earth and sand inside the casing tube, fitting it into the casing tube, leaving the pile in the embedding hole, and pulling out the casing tube.

In this embedding method, the casing tube is inserted into the embedding hole throughout the entire process, from the time of drilling to the time of inserting the pile, so collapse of the embedding hole is prevented throughout the entire process. Moreover, as in the first invention, it is easy to drill a straight buried hole. Therefore, the stake can be easily embedded with high precision.

Next, examples of the present invention will be described.

The equipment used in the pile embedding method of this example is as follows.

The auger rod (1) is as shown in FIG.

A drilling head (3) is provided protruding from the lower end of the shaft (2), and the i! I
There are two screw-shaped stirring blades on the circumference of tll (21).
41, (with 41 installed around / a pair of unusual stirring blades (
51, (5) is provided protrudingly. This auger rod (1)
As shown in FIG. arranged in a shape.

The drilling head (3) protrudes from the lower end opening of the casing tube (6), and the upper end of the shaft (2) is inserted into the casing tube (6).
6) protrudes from the upper end opening. On the other hand, in the tower for embedding stakes (not shown), a motor with a reduction gear for the auger rod (7) and a donut-shaped motor with a reduction gear for the casing tube (8) are installed, as shown in FIG.

■It is installed so that it can be raised and lowered by placing it in the upper and lower positions. As shown in Figure 1, a donut-shaped motor (8) for the casing tube is attached to the rotating shaft of the motor (7) for the auger rod.
Connect the upper end of the shaft (2) of the auger rod that passes through the center hole 2 of the casing tube (6), and connect the upper end of the casing tube (6) to the IEJ rotation W of the motor (8) for the casing tube. [In the lower position of 81, the auger rod (1) and the caning tube (6) fitted to it
? It's hanging down.

This device? When carrying out the pile embedding method of this example, the auger rod (1) with the casing tube (6) is placed directly above the planned pile embedding site, and the inner and outer auger rods (
1) and the casing tube ((1), as shown by the arrows in Figure 7, descend at the same speed while rotating in opposite directions.
The drilling head (3), which protrudes from the lower opening of the casing tube (6) and rotates, excavates an embedment hole (tli) at the planned insertion site, and at the same time, inside the casing tube 1 (6). Rotating stirring blades (41, (5
1 inside the embedded hole aυ, that is, the casing tube (6)
The excavated earth and sand (one is planned to be mixed and crushed).

When the excavation head (3) reaches a predetermined depth, the auger rod (1), which continues to rotate and descend, stops descending, and the casing tube (6) continues to rotate and descend.
) reaches the same depth as the auger rod (1), as shown in Figure 2, then remove the casing tube (6).
Lowering and rotation of the auger rod (rotation of 11? Stop.

After the embedding hole (11) is drilled to a predetermined depth as shown in Fig. 2, the casing tube (6) is inserted into the motor (8).
The auger rod (1) is raised while rotating in the opposite direction to the direction in which it was lowered, and the embedding hole Q is removed as shown in Figure 3.
Leave the casing tube (6) on i and attach the auger rod (
Extract 1).

In short, cylindrical ready-made concrete pile Q3 E embedding hole (1
1) and descends while rotating, placing a cylindrical concrete pile into the embedding hole (b), that is, into the crushed earth and sand Q2 inside the casing tube (6), as shown in Figure ≠. into the casing tube (6).

After the cylindrical concrete pipe A3 is inserted into the casing tube (6) in the embedding hole 0υ to a predetermined depth, the auger rod (11e) extracted earlier is placed directly above the concrete pipe and excavated. Rod (3) concrete pile 03
The motor for the casing tube (
8) to the upper end of the casing tube (6),
While pressing the concrete pile 1 downward with the auger rod (1), raise the casing tube (6) by rotating it three times, leaving the concrete pile in the embedding hole Uυ, as shown in Figure S. Casing chip (6)
) onto the auger rod (1) again. Then, the concrete remains in the embedding hole αM, and is embedded in the planned pile embedding site.

In the embedding method of this example, the auger rod (1) and the casing tube (6) fitted into it dig while simultaneously rotating in the opposite direction, so curvature of the embedding hole (Il+) is prevented. Since the casing tube (6) is inserted into the embedding hole aη, collapse of the embedding hole OD is prevented.

In the illustrated embodiment above, the casing chew 7”
+6j) H-, when removing auger rod (1) 0, leave the embedding hole at 1°C, and remove it after inserting the stakes (1, 1).
The casing tube 3 may be removed at the same time as the auger rod is removed.

[Brief explanation of the drawing]

Figures 1 to 5 are kjf cross-sectional views showing each step of the pile embedding method according to the embodiment of the present invention. Figure 3 shows when the hole has been drilled and when the auger rod is removed. , Fig. 7 shows the concrete pile being inserted in the middle, and Fig. 5 shows the casing tube being removed. 1: Auger rod 3: Drilling head 4 Niscrew-shaped stirring blade 5: Late fall stirring blade 6: Casing tube 11: Buried hole 12: Earth Sand 13: Tubular ready-made concrete pile Patent applicant Tokai Concrete Kogyo Co., Ltd. Company Kumon Construction Co., Ltd. Representative Patent Attorney Katsura Mizuno Figure 1
Figure 2 Figure 3 Figure 2I'4 Figure 5

Claims (2)

[Claims] (1) Dig a hole in the area where you plan to bury the pile, crush the excavated soil, insert a cylindrical pile into the crushed soil in the hole, and embed it in the hole. In the pile embedding method,
Insert the auger rod into the casing tube, which has a drilling head for digging the buried hole at the bottom end and stirring blades for stirring and crushing the excavated earth and sand around it, and insert the auger rod into the casing tube. Therefore, the pile burial is characterized in that the auger rod is arranged concentrically with the casing tube, the excavation head is protruded from the lower end opening of the casing tube, and the excavation is carried out while rotating the inner and outer auger rods and the casing tube in opposite directions. Komi construction method. (2) An auger rod with a drilling head attached to the lower end and a stirring blade attached to the periphery is inserted into the casing tube, and the auger rod is arranged concentrically with the casing tube by the stirring blade fitted into the casing tube, The drilling head is protruded from the opening at the lower end of the casing tube, and the inner and outer auger rods and the casing tube are rotated in opposite directions as the drilling progresses.The drilling head is used to dig a hole in the planned embedding area that is difficult to reach. The excavated soil is stirred and crushed by a stirring blade, and the buried hole is excavated to a predetermined depth.The auger rod is pulled out, leaving the casing tube in the buried hole, and a cylindrical pile is inserted into the casing tube. A pile embedding method characterized by inserting the pile into crushed earth and sand, fitting it into the casing tube, leaving the pile in the embedding hole, and extracting the casing tube.