JPS6038494B2 - Spinning top pile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention comprises an inverted cone-shaped body that becomes narrower toward the bottom;
The present invention relates to a top-shaped pile consisting of a sea bream leg that projects vertically from the center of the lower end of the body.

(Prior art) Top-shaped piles balance the weight of the pile itself and the load it receives, and the combined force of the ground reaction force and frictional resistance generated in the body and shaft legs, thereby reducing the effects of stress. As disclosed in Japanese Patent Publication No. 56-50054 and Japanese Patent Publication No. 55-50527, it is used as a basic component in ground reinforcement and stabilization methods, coastal erosion prevention methods, etc. There is.

In each method, when installing top-shaped piles in soft ground or sand layers on the coast, a hole for embedding the piles is drilled in advance in the ground or sand layer, and the top-shaped piles are suspended and installed in the holes. are doing.
(Problems to be Solved by the Present Invention) However, in construction sites where the ground composition soil has excessive fluidity or is hit by waves, the hole may collapse and be shallowly rebuilt before the top-shaped piles are installed. One.

Therefore, taking into consideration backfilling due to the excessive fluidity of the soil and the sand-sand phenomenon, it is necessary to dig the pile burial hole deeper than the original pile installation level, or to scrape out the inflowing soil at the same time as installing top-shaped piles. Therefore, the work of burying top-shaped piles could not be carried out efficiently.

In addition, because the shape and dimensions of the pile burial hole change due to the inflow and outflow of earth and sand, it is not easy to install the legs of top-shaped piles vertically, and the body surface of top-shaped piles is arranged symmetrically with respect to the vertical line. If this is not possible, the original function of top-shaped piles, which is to divert the vertical component of the ground reaction force to buoyancy to prevent subsidence on the body surface of each pile and cancel out the horizontal components mutually, may not be fully achieved. became.

Accordingly, an object of the present invention is to provide a top-shaped pile that is not affected by excessive soil fluidity or waves and allows proper burying work to be carried out efficiently.

(Means for Solving the Problems) The gist of the top-shaped pile of the present invention will be explained below using reference numerals in the attached drawings.
is provided through the inverted cone-shaped body 1 and the wisteria leg 2, and the vertical hole 3
The lower end is closed at the center of the lower end of the rattan leg 2.

(Example) In the illustrated example, the top-shaped pile a is made of concrete with the body 1
and a wisteria leg 2 are integrally molded, and reinforcing bars 4 are arranged so as to surround the vertical hole 3.

The opening □ at the upper end of the vertical hole 3 is molded to have a slightly enlarged diameter in order to insert and connect the compressed water supply pipe 5 thereto. Compressed water is sent in from the direction of arrow V. Multiple top-shaped stakes a, a・
. . . are arranged horizontally side by side with the upper section sides of the fuselage 1 supporting each other, and the fuselage 1, 1 . . . of the first stage pile group are
...In the gap between the two piles of the second stage piles 2, 2...
・The cables are installed in two levels, upper and lower. In addition, materials other than concrete such as plastic can be used as the forming material for top-shaped piles, and as the fluid for jet drilling,
Air etc. can also be used.

In order to maximize the above-mentioned elutriation sinking characteristics of top-shaped piles,
It is best to install the fuselage 1 so that the side surfaces of the fuselage 1 form an angle of 45 degrees with respect to the upper surface of the fuselage 1, and the upper surface of the fuselage 1 is horizontal. (Function) When installing this top-shaped pile, the top-shaped pile a is lifted with the top-shaped pile 2 facing downward, and compressed water is injected onto the sandy soil 6 from the vertical hole 3 closed at the lower end of the top-shaped pile 2. be done.

This jet of water scatters the soil 6 in the vicinity of the pivot leg 2 and pushes it to the surrounding area, thereby excavating the hole. By sequentially lowering the top-shaped piles a in parallel with the excavation of this hole, the top-shaped piles a are sunk and buried to a required level with the ball legs 2 vertical. Burying the soil 6 around the top-shaped pile a can be done by taking advantage of the large fluidity of the soil 6 itself and the quicksand phenomenon of the waves 7. (Effects of the Invention) As described above, the present invention provides a top-shaped pile a consisting of an inverted cone-shaped body 1 that becomes narrower toward the bottom and a wisteria leg 2 that projects vertically from the center of the lower end of the body 1. A vertical hole 3 for jetting compressed air or water is provided to penetrate through the body 1 and the leg 2, and compressed air or water is jetted from the lower end opening of the vertical hole 3, which is opened at the center of the lower end of the rut chest 2. Since the top-shaped pile is submerged and buried while digging a hole in the soil 6, the work of properly burying the top-shaped pile a can proceed efficiently without being adversely affected by the excessive fluidity of the soil 6 or the quicksand phenomenon of waves. I can do it.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of a top-shaped pile, and FIG. 2 is a sectional view taken along line A--A in FIG. 1. FIG. 3 is a front view of the top-shaped piles shown in FIG. 1 installed in two stages. a... Top-shaped stake, 1...
... body, 2 ... pivot leg, 3 ... vertical hole,
4... Reinforcing bars, 5... Feeding pipes, 6... Soil, 7... Waves. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 Consists of an inverted cone-shaped body 1 that becomes narrower toward the bottom, and a pivot leg 2 that projects vertically from the center of the lower end of the body 1,
A top-shaped pile in which a vertical hole 3 for blowing out compressed air or water is provided through the body 1 and the shaft leg 2, and the lower end of the vertical hole 3 is opened at the center of the lower end of the shaft leg 2.