JPS5950815B2 - How to remove columnar underground obstacles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing existing concrete columns using a high capacity earth auger.

Conventionally, as a method for removing existing foundation concrete piles,
Methods of pulling out directly by hooking a wire, using a vibro hammer, using a reverse diesel hammer, using a hydraulic puller, using a water jet, and digging several holes around the existing pile with an earth auger. There are methods to pull out the existing concrete piles, but these methods damage the ground around the existing concrete piles, and it is difficult to pull out the piles in long piles or in the ground where the ground is subject to a large amount of force, resulting in poor construction efficiency. There were disadvantages such as poor performance and the time it took to remove the piles.

If the existing concrete piles cannot be easily removed using the above method, the design of the piles for new construction work may be changed, or the roots of the above-ground portion of the building may be cut without going through the existing piles. The current method is to cut the piles into pieces according to the stages.

The present invention eliminates the above-mentioned drawbacks and makes it possible to easily and efficiently remove existing concrete piles in any long concrete pile and in any ground in a short period of time. It is something.

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

1 shown in Figure 1 is a foundation pile of an existing building, and the building has already been removed, and only the head of the foundation pile is exposed on the ground surface. 2 is the foundation pile of an existing building. A steel pipe as a guide casing with a diameter larger than that of a pipe is shown.

A vibro hammer 3 is used to drive the steel pipe 2 into the ground so as to surround the existing pile, as shown in FIG.

4 is a large-capacity earth auger, and as shown in FIG. 3, the guide casing 2 driven into the ground is used as a guide.
The auger screw 5 with a carbide tooth tip is rotated while controlling the lateral vibration, and the existing underground pile is crushed as shown in FIG. 3.

After that, the earth auger and guide casing are pulled out and backfilled with sandy soil, etc. to complete the process.

As mentioned above, the present invention relates to a method for crushing and removing existing foundation piles and the like as columnar underground obstacles,
Naturally, if the existing shaft is long, the auger screw 5 will also be long, and this is the most suitable removal method in such a case.

That is, a long columnar underground obstacle 1 is connected to a long auger screw 5.
When the blade fractures while rotating, its insufficient rigidity and lateral vibration result in a decrease in crushing force.

Therefore, by preventing the lateral vibration of the long auger screw 5 using the guide casing 2, there is an advantage that the lack of rigidity can be compensated for and the crushing force can be maintained.

As mentioned above, a steel pipe is suitable for the guide casing 2 of the earth auger screw 5, but it is not necessarily limited to a steel pipe.

When carrying out the present invention, after crushing the columnar underground obstruction, backfilling is performed with the guide casing 2 installed, and by pulling out the guide casing 2 with a vibro hammer 3 or the like, the backfilling soil is removed. There is also the advantage of compaction to a certain extent.

In this way, the same effect as that obtained by crushing and backfilling columnar underground obstacles and removing them can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side view of the method of removing columnar underground obstacles according to the present invention in preparation for implementation, Fig. 2 is a view with the guide casing driven in, Fig. 3 is a view of the auger screw being rotated, and Fig. The figure shows a fractured columnar underground obstacle. 1 = columnar underground obstacle, 2 = guide casing, 3 - vibro hammer, 4 - earth auger, 5 = auger screw.

Claims (1)

[Scope of Claims] 1. A columnar underground obstacle in which a steel material 2 is driven into the ground so as to surround the columnar underground obstacle 1, and then the columnar underground obstacle 1 is crushed with an earth auger excavator 4. How to remove. 2. The method for removing a columnar underground obstacle according to paragraph 1, in which a steel pipe 2 having a larger diameter than the obstacle 1 is driven into the ground.