JPH0354176Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention makes soil mortar-like by excavating with the excavation head at the tip of the excavation shaft while squirting cement milk into the ground from the tip through the center of the excavation shaft. This article relates to foundation piles in which hollow pile bodies are screwed into the ground.

[Conventional technology] In conventional foundation piles, a shaft with a spouting passage for feeding cement milk in the center and a drilling screw provided from the upper end to the tip is inserted into a hollow part, and the cement milk is passed through the shaft to the tip. A construction method is used in which the soil is excavated using a digging screw, which is then injected into the ground, and the pile bodies are then sunk into the ground. In addition, as a pile press-in construction method, a screw body is attached to the outer periphery of the tip of the pile, and a torque tube with a screw is inserted inside the pile. There is a method in which ready-mixed concrete or cement milk is ejected from the tip and is integrally fixed around the tip of the pile and around the screw body to form an expanded foundation (Japanese Patent Application Laid-Open No. 1983-1999-
No. 43823).

[The problem that the idea attempts to solve]

In the conventional foundation pile, cement milk is ejected from the shaft, and the shaft rotates to excavate the soil and make it into a mortar-like form. Mud and muddy water spills into areas near the construction site and into roadside ditches, causing problems, and it is necessary to dispose of the large amount of excavated soil, which is transported by transport vehicle to a dumping site and disposed of. There is. Also, the drilling screw
When discharging mud and muddy water, the mud adheres to the excavation screw and rises to a high place, which can cause lumps of mud to fall and scatter, causing danger and accidents. In order to prevent this, the mud adhering to the excavation screw is manually removed, but if the mud is firmly adhered to the screw, it is not easy to remove all of it, and as mentioned above, There are such dangers and problems. In addition, in the latter pile press-fitting method, it is not easy to install a large screw body around the pile, and the slope of the collar of the screw body cannot be changed, so it is necessary to install ready-mixed concrete or cement along the screw body. Although the milk rises, it cannot be stirred, and since there is no side cutting blade at the bottom of the pile, it is not possible to dig a wide hole, and the fresh concrete or cement milk is pushed out to the outside of the pile, making it difficult to mix with the soil. There was a problem.

This idea excavates the side surface using the cutting edge at the bottom of the pile.
Cement milk is ejected from the central excavation shaft, mixed with the excavated soil by the excavation head, and the soil concrete made into a mortar is pushed to the outside of the pile body by the side excavation cutting blade, A large amount of mud and muddy water is discharged to the ground by stirring with the stirring vanes and filling the ground and the surrounding surface of the pile body, and some of the soil concrete is also filled into the hollow part of the pile body. To provide a foundation pile that facilitates work without the need for disposal of residual soil and without the rise of lumps of mud to high places.

[Means to solve the problem]

This idea was developed as a technical means to solve the problems of the conventional method by providing a spouting passage for feeding cement milk into a hollow pile body at the center, inserting a digging shaft with a digging head at the tip, and using a catch fitting as appropriate. A plurality of cutting blades for side digging are fixed radially to the pile body metal fittings at the lower end of the pile body, protruding outward from the circumferential surface of the pile body in a radial manner so that the pile body The foundation pile is constructed by attaching a plurality of stirring vanes to the peripheral wall of the pile in a staggered manner at arbitrary intervals and with appropriate inclination angles.

[Effect]

According to the foundation pile of this invention, cement milk is ejected through the center of the shaft to the excavation head at the tip, and at the same time, it is mixed with soil that has been excavated by rotation using the excavation head and side excavation cutting blade, creating a mortar-like soil concrete. The soil concrete is then pushed to the outside of the pile body with the digging cutting blade on the side, and pushed into the empty space between the circumferential surface of the pile body and the excavated hole, and the soil concrete is stirred on the side of the pile body. The soil concrete pushed in by the blades is stirred and filled into the void, and a part of the soil concrete is pushed into the hollow part from the opening at the lower end of the pile body to fill it.
The pile body is sunk to a predetermined depth, and then the shaft is rotated in the opposite direction and pulled out, and the surrounding surface and internal voids of the pile body are filled with 100% soil concrete and pseudo-hardened to integrate it with the ground. It is something.

〔Example〕

This invention will be explained below based on embodiments shown in the drawings. 1 is a pile body having a hollow part 1a, antibody metal fittings 2 are fixed to the upper and lower ends thereof, and a plurality of side digging cutting blades 3 are fixed radially to the pile body metal fittings 2 at the lower end, and the pile body is sunk. The side surface of the hole A is excavated and the soil concrete is pushed out to the outside of the pile body, and the peripheral wall 1b of the pile body 1 is provided with several stirring blades arranged at arbitrary intervals in different steps. 4 are fixedly installed at appropriate inclination angles, and the soil concrete is stirred in the gap B formed between the holes A and the excavated holes A. The side surface digging cutting blade 3 is made of several L-shaped steel pieces that project outwardly from the lower end of the pile metal fitting 2 in an inclined manner and are fixed by welding. Although the length and size of this digging cutting blade 3 are not particularly limited, it is provided so as to slightly protrude from the stirring vane plate 4.

Further, the stirring vane 4 has a width of several centimeters to several tens of centimeters, and the inner surface of the vane is connected to the edge of the peripheral wall 1b of the pile body 1.
The blade plate 4 is attached at an appropriate inclination angle with respect to the axis of the pile body so that the blade plate 4 is aligned with the pile body. Each stirring blade plate 4
The angle of inclination of the soil concrete is slightly changed so that the soil concrete can be stirred more effectively.

As a means for attaching the stirring vane plate 4 to the peripheral wall 1b of the pile body 1, in the embodiment, a cylindrical bolt insertion part 5 is fixedly installed on the central lower surface of the stirring vane plate 4,
The tightening nut 6 is pre-installed in concrete on b.
A reinforcing bar 8 is welded to the bottom of the nut to prevent the nut from rotating.
The nuts 6 are provided at several locations on the peripheral wall of the pile body 1 at appropriate intervals from the tip. Each nut 6 and the bolt insertion hole 5 of the stirring blade plate 4
Align and secure with bolts 7.

The mounting structure of the stirring vane plate 4 is not limited to that of the embodiment, and the stirring vane plate 4 may be held at both ends, or the inside of the stirring vane plate 4 may be directly embedded and solidified during manufacture of the pile body. It is also possible to set 9 is a spout passage 1 into which cement milk is press-fitted.
A drilling shaft is provided with the center at 0, and a drilling head 11 is provided at the tip of the shaft for digging in order to sink the pile body, and a screw is installed at the bottom of the shaft to fill the hollow part of the pile body with soil concrete. 12 is provided, and the digging shaft 9 is inserted into the hollow part 1a of the pile body 1,
The pile body metal fittings 2, 2 on the upper and lower sides of the pile body 1 are caught by pile body catch metal fittings 13, 13, and the excavating shaft 9 and the pile body 1 are integrally fixed to enable co-rotation.
When the shaft 9 is rotated in one direction, the shaft and the pile body are excavated and rotated as a unit when the shaft 9 is rotated in one direction, and when the shaft 9 is rotated in the opposite direction, the catch of the catch metal fitting 13 is released and the shaft 9 is moved into the pile body. 1 from the hollow part 1a.

Since this device has the above-mentioned configuration, cement milk is spouted into the ground from the tip of the excavation shaft 9, and at the same time, the excavation head 11 and the side excavation cutting blade 3 perform rotary excavation, and excavation is carried out with the cement milk. The soil is made into mortar-like soil concrete, the soil concrete is pushed outward with the cutting blade 3 for side excavation, and the empty space between the peripheral wall of the pile body 1 and the ground is filled with the soil, and the agitation blades on the peripheral surface of the antibody are used. The soil concrete is stirred by the plate 4 to densely fill the voids, and some of the soil concrete is removed by the screw 1 installed at the bottom of the shaft.
2 is filled into the hollow part 1a of the antibody 1, and the soil concrete is pseudo-hardened to integrate the antibody with the ground.

[Effect of idea]

According to the foundation pile of this invention, a plurality of cutting edges 3 for side drilling are provided at the lower end of the antibody so as to protrude outward from the antibody, so that the sides of the hole around the lower end of the antibody are It is possible to excavate a wide area, and the cement milk squirted from the excavation head is thoroughly mixed with the excavated soil using the excavation head and side excavation cutting blade to form mortar-like soil concrete, and this soil concrete is used for excavation. The cutting edge can be used to push the antibody to the outside and sufficiently push it into the gap between the circumferential surface of the antibody and the drilled hole. In addition, since the stirring blades are attached to the peripheral wall of the antibody in a stepped manner and the angle of inclination is changed as appropriate, the soil concrete that is pushed outward by the excavation cutting blade is sufficiently stirred and the gap between the antibody and the ground is filled. The soil concrete can be filled with high density and the antibody can be firmly integrated with the ground. In addition, the hollow part of the antibody can be filled with soil concrete, and the shaft is removed after being deposited and the soil concrete is left in the hollow part, so mud and water from the antibody are rarely discharged to the ground. Therefore, there is no need to treat mud and muddy water during antibody deposition work, and since mud does not rise to high places, accidents due to falling and scattering can be prevented. It is possible to eliminate the harmful effects of muddy soil and muddy water on neighboring areas and gutters at once, and furthermore, the construction period is quick, and it is possible to provide an excellent product in terms of economy and safety.

[Brief explanation of drawings]

Figure 1 is a front view of the foundation pile of this invention, Figure 2 is a bottom view of the same, Figure 3 is a vertical cross-sectional view with the excavation shaft attached, Figure 4 is a bottom view of the same, and Figure 5 is a FIG. 6 is a cross-sectional view showing an exploded state of the stirring blade, and FIG. 6 is a cross-sectional view showing the state of excavation. 1... Antibody, 2... Antibody metal fitting, 3... Cutting blade for side cutting, 4... Stirring vane plate, 5... Bolt insertion part,
6...Nut, 7...Bolt, 9...Drilling shaft, 10...Ejection passage, 11...Drilling head, 1
3...Catch metal fittings.

Claims (1)

[Scope of Claim for Utility Model Registration] A hollow pile body 1 is provided with a spouting passage 10 for feeding cement milk at its center, and a digging shaft 9 having a digging head 11 at its tip is inserted through the shaft and a catch fitting is used as appropriate. In a pile that is capable of being locked or released, a plurality of side-excavation cutting blades 3 are radially fixed to the pile body metal fitting 2 at the lower end of the pile body 1 so as to protrude outward from the circumferential surface of the pile body 1 in an inclined manner. And, pile body 1
A foundation pile characterized in that a plurality of stirring vanes 4 are attached to the peripheral wall of the foundation pile at arbitrary intervals and at different levels, each with an appropriate inclination angle. As a means for fixing the stirring vane plate 4 to the pile body 1, bolt insertion portions 5 are provided on the stirring vane plate 4, nuts 6 are buried in the peripheral wall of the pile body 1, and the blade plate 4 is
The foundation pile according to claim 1, which is a registered utility model, and can be attached to the peripheral wall of the pile body with bolts 7 at an appropriate inclination angle.