JPH0542528B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a pile erecting device that rotates and erects non-circular piles such as H-shaped steel or polygonal piles directly into the ground.

<Conventional technology> This type of pile erection device was developed by the Special Publication Corporation in 1973.
It is disclosed in Publication No. 23123.

In this device, a rotating body with a rotary table at the lower end is attached to a base that can be moved up and down, and while rotating in a fixed direction, it matches the cross-sectional shape of a pile such as a shaped steel attached to the lower rotary table. This is a device for erecting piles by supporting the pile with a frame that supports the pile, and adding the weight of the main body to the pile's own weight using a chuck mechanism installed on the upper frame to prevent back movement.

<Problems to be solved by the present invention> In the case of the above-mentioned erecting equipment, not only is the structure complicated, but also the lateral vibration cannot be controlled at the tip of the pile body, so it is necessary to ensure the verticality of erecting. It is difficult to do so.

<Object of the present invention> The present invention has been made in view of the above points, and provides a pile body erecting device that can control the lateral swing of the pile body and maintain high verticality while erecting the pile body. Our goal is to provide the following.

<Structure of the present invention> An embodiment of the present invention will be described below with reference to the drawings.

<A> Description of non-circular pile The present invention provides a digging blade at the tip of a non-circular pile body (hereinafter referred to as "pile 1"), and applies rotational force to the base end of this pile 1 to directly dig into the ground while excavating. This relates to the construction technology of the pile bodies to be built inside.

<B> Structure of the tip of the pile In this example, the case where the pile 1 is erected from H-shaped steel will be explained.

As shown in FIG. 1, the tip of the pile 1 is equipped with an excavation means, a means for preventing lateral vibration of the pile, and a fluid discharge means.

Further, a stiffener (reinforcing material) may be attached between the flanges 12 of the pile 1 to prevent twisting.

<B> Excavation means The tip of the pile 1 is equipped with a digging means.

As shown in FIG. 2, the excavation means is, for example, formed by cutting off the flange 12 and rib 13 at the lower end of the pile 1 at an acute angle.

[Drilling Blade] Two sets of digging blades 2 and 3 are fixed by welding or the like between the sharply formed flange 12 and the rib 13.

The excavating blades 2 and 3 are formed by carving a serrated blade on one side of a triangular plate, and are attached with the serrated blade part facing the rotation direction of the pile 1.

As shown in FIG. 3, when the pile 1 is rotated, the first excavating blade 2 passes through the trough and removes the remaining earth and sand from the second excavating blade 3. The grooves and peaks of both excavating blades 2 and 3 are formed so as to complement each other and excavate, such that the peaks pass through and scrape off.

In addition, there is a punch hole 1 in the flange surface 12 at the tip of the pile 1.
Open multiple 4.

This hole 14 was opened for the purpose of reducing the rotational resistance of the pile 1 by allowing mixed soil, etc., which is a mixture of excavated soil and other fluids (water, air, mortar, soil concrete, etc.), as described later. It is a hole.

In addition, a discharge hole 15 is provided on the surface of the rib 13 at the bottom of the pile 1.

<C> Lateral vibration prevention means A plurality of annular anti-shake rings 4 are attached to the outer periphery of the pile 1.

The anti-sway ring 4 is an annular body having a diameter that aligns and inscribes the center of rotation of the pile 1 and the center of the anti-sway ring 4.

The lower part of the pile 1 is also covered with a steadying ring 4.

A ring bit 41 is provided protruding from the lower surface of the steadying ring 4.

<D> Fluid discharge means Pile 1 contains bentonite liquid, pressure water, air,
Hose 5 for supplying various types of concrete, etc.
Attach it over the entire length.

The lower end opening of the hose 5 is located at the center of the discharge hole 15 and is attached so that various fluids can be discharged into both spatial regions partitioned by the ribs 13.

It is also possible to interpose a removable connector in the middle of the hose 5 and recover the hose 5 above the connector after the pile 1 has been erected.

As this connector, a known removable connector that can be easily removed from the ground can be used.

Next, the excavation method will be explained.

(1) Erecting the pile The head of the pile 1 is connected to the chuck part 61 of the auger device 6.
The excavation is started while rotating the pile 1.

During excavation, bentonite liquid 7 is discharged from hose 5.

Earth and sand existing in the rotation range (rotation plane) of the pile 1 is efficiently excavated by the two attached excavation blades 2 and 3 whose excavation trajectories complement each other.

Further, the outer peripheral area is excavated by a ring bit 41.

The excavated and fluidized earth and sand is pressed against the surfaces of the rib 13 and the flange 12 by the rotation of the pile 1.

The pressed earth and sand is discharged to the outside of the pile 1 through the hole 14.

Therefore, the excavated earth and sand are discharged out of the hole together with the bentonite liquid 7 and the like without becoming an obstacle to the rotation of the pile 1.

Additionally, there is generally a concern that lateral vibration will occur when non-circular piles are rotated.

However, by covering the outer periphery of the non-circular pile 1 with the anti-sway ring 4, the lateral vibration can be reliably controlled.

Therefore, the pile 1 is erected straight.

The hole wall of the hole opened by drilling pile 1 is
Collapse is prevented by the bentonite liquid 7.

(2) Completion of the pile After the pile 1 is extended and erected to the specified depth, the operation of the auger device 6 is stopped, and the chuck part 61 is
Then, the grip on the pile 1 is released and the erection work is completed.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

(b) Piles can be directly erected by simply modifying the existing tip to some extent, eliminating the need for pre-boring as in conventional construction methods.

Therefore, the construction period can be significantly shortened.

(b) The digging blades attached to the tips of the piles were formed into shapes that complemented each other so that no excavation was left behind.

Furthermore, by attaching a bit to the anti-sway ring to prevent the pile from swinging laterally, excavation performance is further improved.

(c) Since the piles are rotated for erection, there will be no impact noise or vibrations.

Therefore, it can be used for construction work in quiet residential areas, and there is no need to worry about noise pollution.

(d) Not only can H-shaped steel, box-shaped steel, and various non-circular piles be used, it can also be used for various types of construction work such as foundation piles and mountain retaining piles, making it highly versatile.

(E) Since the excavated and fluidized earth and sand passes through the holes made in the pile, the rotational resistance of the pile can be reduced.

(f) If a removable connector is inserted in the middle of the hose, the hose above the connector can be recovered and reused after the pile has been erected.

[Brief explanation of drawings]

Figure 1: An explanatory diagram of the tip of the pile, Figure 2: An explanatory diagram of the pile being erected, and Figure 3: An explanatory diagram of the excavation blade.

Claims (1)

[Scope of Claims] 1. A non-circular pile body having an excavating means at the tip of the pile, a fluid discharging means for discharging fluid onto the excavated surface, and an annular steadying ring encircled in the middle of the pile; A pile erection device consisting of a drive device that grasps the pile body and applies rotational force to directly erect it into the ground.