JPS5927089A - Pit hole constructing method and auger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pile hole construction method using an earth auger and its construction using an earth auger. As the ground loosens, the pile bearing capacity inherent in the ground is inevitably reduced, and therefore piles constructed using the Earth-O 71 construction method do not necessarily have sufficient bearing capacity, especially in the case of friction piles. A large impact.

An object of the present invention is to provide a method of constructing a pile hole using an earth ocher with improved pile supporting capacity, and an earth ocher for the construction.

In the pile hole construction method of the present invention, when excavating a pile hole with an earth ocher, an airtight bag is inflated by zero injection of /711 pressure fluid into a space surrounded by auger spiral blades. A pile hole is dug in the ground using a wound P-suono j-, and the airtight bag body of the earth auger is inflated in the pile hole by injection of pressurized fluid to consolidate the area around the pile hole. 9 The Earth-O 75- used in the above construction method of the present invention is an airtight bag that is expanded by injecting pressurized fluid into an excavated pile hole and compresses the area around the pile hole, and is returned to a space surrounded by ocher spiral vanes. According to the present invention, a pile hole is dug in the ground by a ground wire around which an airtight bag body is wound by sliding around the space surrounded by the spiral blade. F, the ground in that pile hole)
3. Top of the airtight bag/11 Pressurized fluid is injected into the bag to expand it and consolidate the area around the pile hole, and this consolidation improves the geology of the pile hole. Moreover, in this case, the airtight bag body is a P-Sooker spiral blade and O7j-+i4t! 1t (11) is surrounded by them, so the airtight bag in the part facing the ground expands intensively and effectively, and this expansion causes effective ground improvement through consolidation around the pile hole. done to.

After that, if the airtight bag is deflated by draining the pressurized fluid inside, and pulled out of the pile hole along with the earth ocher,
Spiral F of air bag body exposed to auger spiral blade
This type of pile hole is particularly suitable as a pile hole for cast-in-place piles, since the expansion of the pile hole results in a pile hole with a spiral-shaped expansion hole around the periphery. That is, the cast-in-place pile obtained by driving the Sifreet into the pile hole has a spiral-shaped enlarged part on the circumference, and has a large supporting capacity. When the earth ocher is rotated and moved up and down while the airtight bag is inflated, a cylindrical pile with an inner diameter corresponding to the outer diameter of the spiral of the inflated airtight bag and whose peripheral surface is consolidated is formed. You get a hole. That is, in this case, the pile hole can be expanded by consolidation and then made into a cylindrical shape.

In this way, according to the present invention, the area around the pile hole can be consolidated and the ground can be improved, so the constructed pile hole is guaranteed to improve the pile bearing capacity. When a pile is constructed, concrete or the like is filled between the ready-made pile and the pile hole in the same way as when constructing a pile using the conventional earth auger method.

Still, in the present invention, the strata around the airtight bag of Earth Oats S- are pushed to the side of P-Suo 3- by the expansion of the bag, so soil gets stuck between the spiral blades of Earth Oats S-. Therefore, there is no need to remove the deposit-resistant soil between the spiral blades after pulling up the earth auger.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, (1) is a continuous screw set earth ocher, and the airtight bag body (3) is wound around the space surrounded by the spiral blades (2) of the earth ocher (1). It is possible to use one that is expanded by injection of pressurized fluid such as m0 air, for example, one that is made of a "mu-shaped" elastic body. To attach the airtight bag body (3) to the earth auger (1), bolt only the F end of the bag body (3) to the ocher shaft (4) and fix it with strong adhesive, etc., and fix the other parts with spiral blades. It is sufficient to wrap it around the auto-tS-shaft (4) in the space surrounded by (2).

Attach the earth ocher (1) with the airtight bag body (3) as an attachment to a base machine y such as a power shovel, dig a pile hole (5) in the ground (Fig. GFJ2), and inside the dug pile hole (5). Then, pressurized fluid is injected into the airtight bag body (3) of the earth auger (1) to inflate it (FIG. 3). In this way, the part of the pile hole (5) facing the airtight bag (3) is consolidated by the expansion of the bag, improving the geology to have a large pile-bearing capacity, and the consolidated part is expanded in a spiral shape. After the area around the stake hole (5), which becomes the hole (6), is compacted, the airtight bag (3) is reduced in pressure and contracted by discharging the pressurized fluid, and the earth ocher (1) is pulled up from the stake hole (5).

After inflating the airtight bag (3), rotate the Earth-O 71- (1) while keeping it inflated without lowering the pressure and deflate it to form a cylindrical pile hole with the surrounding area consolidated. (not shown) is obtained. Earth auger in this case (1)
The rotation of the earth ocher (1) may be similar to that of the conventional earth ocher during extraction, and the upward movement may generally be about one pitch of the spiral blade (2) of the earth ocher (1).

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the earth ocher of the present invention, and Figs. 2 and 3 are longitudinal sectional views showing the embodiment of the construction method of the present invention in the order of steps. (1) is an earth ocher (2). The ocher spiral blade (3) is the airtight bag body (4), the ocher shaft (5) is the pile hole (6), and the expansion hole part (see Figure 1 Figure 2 42 Figure 3)

Claims (1)

[Claims] ■ When excavating a pile hole using an earth auger, the earth auger, which was previously used to wrap an airtight bag that is expanded by injecting pressurized fluid into a space surrounded by ocher spiral blades, is used to dig into the ground. A pile hole construction method comprising: digging a pile hole, and inflating the earth ocher airtight bag within the pile hole by injecting m-pressure fluid to compact the area around the pile hole. ■ When excavating a pile hole using Earth Oats 73-, the earth oats J-, which is an airtight bag that is inflated by injection of pressurized fluid and wound around a space surrounded by ocher spiral blades, is used to attach the pile to the ground. A hole is dug, the airtight bag of the earth ocher is inflated within the pile hole by injection of pressurized fluid to compact the area around the pile hole, and then the earth auger with the expanded airtight bag is moved up and down while rotating. A pile hole construction method characterized by: ■ An airtight bag that is expanded by injecting pressurized fluid into the excavated pile hole and compacts the area around the pile hole is placed around the space surrounded by the auger spiral blades. Air-sword with pile hole-9