JPS60156821A - Construction of pile - Google Patents

Abstract

PURPOSE:To enable the titled work the main structure of the pile is made of concrete using casing alone, by a method wherein, on the top end of a steel tube casing, an excavating blade and a port for pouring-in and out a cement milk and the like is prepared while on the inner surface of the top and thereof, a screw is provided. CONSTITUTION:A casing 1 is rotated and pressed into a ground by a driving unit, while a hardening agent such as a cement milk is ejected out through a pouring-in and out port 6 via a passageway 5. Then, the excavated earth and sand cut by an excavating blade 2, 3 is stirred and mixed by and with the screw blade 7 and the hardening agent, forming a soil concrete, and filled in the casing 1. Said casing may be drawn out, however, if it is left buried, it functions as a steel pipe pile with soil concrete filled inside.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a construction method for constructing foundation piles used for earth retaining, water stopping, etc. in civil engineering construction work.

[Prior art and its problems]

When excavating a pile hole, by mixing the excavated soil and a hardened phase such as cement milk to create fill concrete, and forming the pile with this soil concrete, there is no need to remove the excavated soil, simplifying the process. It is known to do. Incidentally, steel pipe casings are often used to prevent the collapse of the hole wall during excavation, including the piles in soil concrete 1. However, in conventional construction methods, the casing is separate from the earth auger excavation means. The stirring means used when making fill concrete was an auger rod or the like equipped with stirring blades. If a device with a double structure of an auger or the like and a casing is used in this way, the entire device including the drive mechanism becomes complicated and difficult to handle.

[Purpose of the invention]

The purpose of the present invention is to eliminate the disadvantages of the conventional example, to create a pile made of soil concrete using only a casing, using inexpensive and simple equipment, simplifying the work process, and streamlining the construction process. - To provide construction methods.

[Key points of the invention]

However, according to the present invention, the purpose of the lever is to screw a screw along the tip of a steel pipe casing whose upper part is connected to a rotational drive device and which has a drilling blade and a spout for dispensing cement milk, etc. at the tip and along the inner wall surface at appropriate locations. This is achieved by providing a blade, and when rotating and inserting this casing into the ground, the inside of the casing is filled with fill concrete while mixing the excavated earth and sand with the excavation blade and cement milk, etc. with the screw blade. Ru.

[Embodiments of the invention]

First, the casing used in the construction method of the present invention will be explained first. Fig. 1 is a side view showing an example of the casing;
FIG. 2 is a side view of the essential parts of the same, and FIG. 3 is a bottom view, in which the steel pipe casing 1 is provided with a digging blade 2.3 at its tip.

Among these, a plurality of excavating blades 2 are provided symmetrically on the outer peripheral end, and the excavating blades 3 are planted in parallel to a beam 4 that has been removed so as to cross the tip opening. Further, a flow path 5 was provided in the length direction of the casing 1, and its tip was opened at the tip of the casing l as a spout 6. A plurality of these flow passages 5 (four in the figure) are also arranged at appropriate intervals.

A screw blade 7 is formed along the inner wall near the tip of the casing 1 with a large opening 8 in the center. This screw blade 7 is used not only at the tip of the casing 1, but also at the tip of the casing 1.
It may be provided at a midway point or over the entire length. In addition,
The upper end of the i-thing 1 is connected to a rotational drive device (not shown), and the upper end of the flow path 5 is also connected to an inflow hose or the like via a swivel mechanism.

Next, the construction method of the present invention using the above device will be described. The casing 1 is suspended from a leader mast provided on a construction vehicle via a drive device and set upright on the ground surface. The driving device is started, and the casing 1 is gradually cut into the ground while digging with the digging blade 2.3 at the tip. At this time, pouring out a hardening agent such as cement milk from the spout 6 will cause the casing 1 to cut into the ground. The excavated earth and sand created by the blades 2 and 3 are stirred by the screw blade 7 and transported upward. In this way, fill concrete is formed by the screw blades 7, and as the casing 1 is inserted, this fill concrete gradually fills the inside of the casing 1 from the tip.

The casing 1 may be left alone, but if it is buried as is, a steel pipe pile filled with fill concrete will be created.

In addition, the upper part of the casing 1 is cut off as appropriate or is removably joined with a flange from the beginning to prepare for the above-mentioned burial, and the part where the screw blade 7 at the tip and the excavation blades 2 and 3 are formed is separated from the other main body parts. It may be made detachable as a separate body.

As described above, the pile construction method of the present invention can create piles mainly made of fill concrete using only casings, the equipment used is simple and inexpensive, and the process is simplified. , which can streamline construction.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the steel pipe casing used in the construction method of the present invention, Fig. 2 is a side view of the main parts of the same, Fig. 3
The figure is a bottom view of the same as above. ■...Steel pipe casing 2, 3...Drilling blade 4...
Beam material 5...Flow path 6...Outlet 7...Screw blade 8...Opening Applicant: Morio Okanogami Applicant: Sanwa Kizai Co., Ltd. Figure 1 b3 z Figure 2 Figure 3

Claims (1)

[Claims] The upper part is connected to a rotary drive device, and screw blades are provided along the tip of the steel pipe casing, which has a drilling blade and a spout for pouring cement milk, etc., at the tip and along the inner wall surface at appropriate locations, and the casing is rotated into the ground. A method for constructing a pile, characterized in that when inserting the casing, the inside of the casing is filled with fill concrete while mixing the earth and sand excavated by the excavation blade with cement milk or the like using the screw blade.