JPS6120107Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pile mainly made of steel, which is to be driven into so-called hard soil, such as a hard stratum or a soft rock layer.

Generally, when driving steel piles such as tubular, plate-shaped, H-type, I-type, etc., they are conventionally driven directly into the soil using a percussive or vibrating pile driver, but if the stratum becomes hard beyond a certain level, driving becomes difficult. For this reason, a method is used in which water is injected into the soil at ultra-high pressure from the tip of the soil.

However, with this method, the reaction force of ultra-high pressure water from the stratum at the driving tip acts on the pile, impairing the penetration force, and in order to compensate for this loss, it is necessary to prepare a vibro hammer with a large impact force.
Even if ultra-high pressure water is used, for example, if the geological formation is soft rock, it is still not sufficient to destroy the soft rock.
There were problems such as difficulty in driving in such places.

In addition, conventional devices that drive piles while spraying water into the soil often use the driving tooth piece itself as a nozzle to protect the water supply pipe, and in this case, the driving tooth piece itself becomes expensive. There was a problem.

This invention was developed in view of the above-mentioned problems, and it is possible to drive any type of material, whether shaped steel or tubular material, into hard soil using conventional water jets and a pile driver such as a vibrohammer. The purpose of this project is to provide a pile for hard soil that can be more easily carried out and the structure of the driven tooth piece can be simplified and made cheaper. A tapered driving tooth piece is attached to the driving tip of the pile making body so as to protrude further from the driving tip edge,
In a pile for hard soil that is configured to inject high-pressure water from the driving tooth piece, the driving tooth piece has a water supply pipe insertion hole from the upper end toward the tip side, and the water supply pipe insertion hole on the side surface. A high-pressure water supply pipe is inserted into the water supply pipe insertion hole from the upper end of the driving tooth piece, and an injection nozzle is provided protruding from the side surface of the water supply pipe, and the injection nozzle is connected to the injection hole. A pile for hard soil is characterized in that the window of the toothed piece protrudes toward the tip edge side of the steel pile body.

Next, an example of implementation of the present invention will be described with reference to the drawings. 1 in the figure is a steel pile body as a sheet pile. The pile body 1 is provided with a plurality of driving tooth pieces 2 on one side of its driving tip. This driven tooth piece 2
is made of a hard metal material such as high carbon steel and has a wedge-shaped tip. Then, the wedge-shaped tip is made to protrude further from the tip edge of the pile body 1.
It is fixed at

Further, this driving tooth piece 2 has a water supply pipe insertion hole 3 formed from its upper end toward the tip side, and windows 4 are opened on both sides of the tooth piece 2 in communication with the water supply pipe insertion hole 3.

The tip of the water supply pipe 5 is inserted into the water supply pipe insertion hole 3 . The water supply pipe 5 has a flat tip and is closed, and nozzles 6 are attached to both sides of the tip.
This nozzle 6 is opened obliquely upward on the side surface of the water supply pipe 5, and is located at the center of the window of the driving tooth piece 2, so as to jet water toward the tip edge of the pile body 1. Further, the upper side of the water supply pipe 5 is supported by supports 7 welded to the pile body 1 at regular intervals, and extends toward the upper end side along the pile body 1.

When using this pile body 1, as shown in FIG. The pipe is connected to a high-pressure pump 10, and high-pressure water is injected from the nozzle 6.

By driving in this way, as shown in FIG. 6, the driving tooth piece 2 is driven into the hard soil first. That is, since the driving tooth piece 2 protrudes from the tip edge of the pile body 1, the impact force of the pile driver is concentrated on the driving tooth piece, and the driving tooth piece easily penetrates into the hard soil in advance. The wedge effect of the driven tooth pieces causes cracks in the surrounding hard soil. At this time nozzle 6
If there is no high-pressure water jet from the pile body 1, it will no longer be possible to drive the pile body 1 into the hard ground beyond a certain level. However, since the nozzle 6 is directed toward the tip edge 1a of the pile body 1 rather than the driving tooth piece 2 driven in earlier, the high-pressure jet water is injected along the cracks in the hard soil base and the tip of the pile body 1. The tip of the pile body 1 is driven into the hard soil by weakening the portion up to the edge 1a side so that it can be driven into the hard soil. Further, during this driving, the hard soil slab pieces pushed away by the pile body 1 are swept upward by the jet from the nozzle, and this upward flow further assists driving. In this way, sequentially up to the desired depth,
The pile body 1 is driven.

The water supply pipe 5 and the driving tooth piece 2 may be made to be recoverable after driving the pile.

In the above example, a seal pile was used, but it goes without saying that piles using appropriate steel shapes such as H-type and I-type, or cylindrical steel pipe piles may also be used.

The hard soil pile of the present invention is constructed as described above,
By providing a driving tooth piece that protrudes further from the tip of the pile and making it possible to inject high-pressure water from the driving tooth piece toward the edge of the tip of the pile, it is possible to spray high-pressure water in the driving direction of the pile, unlike conventional methods. This makes it possible to drive into hard soil, which is much harder than those that spray water.

In addition, the hard soil pile of the present invention has a driven tooth piece protruding from the lower end that is formed separately from the water supply pipe, into which the water supply pipe with a nozzle is inserted, and the nozzle is inserted into the window on the side. By arranging the nozzle, the nozzle is well protected, and the structure of the driving tooth piece itself is simplified.
In addition, it can be constructed so that the water supply pipe can be removed and reused, making it possible to provide a device with excellent functionality at a low price.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a front view of the tip of the pile, FIG. 2 is an enlarged perspective view of the driving tooth piece, and FIG. 3 is a longitudinal sectional front view of the same. 4
The figure is a longitudinal side view of the same, Figure 5 is a perspective view of the state in use,
FIG. 6 is a sectional view showing the implanted state. 1... Pile body, 2... Driving tooth piece, 3... Water absorption pipe insertion hole, 4... Window, 5... Water absorption pipe, 6...
Nozzle, 7...Support, 9...Pile driver.

Claims (1)

[Scope of utility model registration request] A pile for hard soil, in which a tapered driving tooth piece is attached to the driving tip of a steel pile main body so as to protrude further from the driving tip edge, and high-pressure water is injected from the driving tooth piece. In the above, the driving tooth piece has a water supply pipe insertion hole from the upper end toward the tip side, and has a window on the side surface communicating with the water supply pipe insertion hole, and the driving tooth piece has a water supply pipe insertion hole from the upper end thereof to the water supply pipe insertion hole. A high-pressure water supply pipe is inserted into the insertion hole, and an injection nozzle is provided protruding from the side surface of the water supply pipe, and the injection nozzle protrudes toward the tip edge side of the steel pile main body from the window of the driving tooth piece. Piles for hard soil foundations.