JPS6017899B2 - Method and equipment for removing existing concrete piles - 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 pipe hammer, method of using a reverse diesel hammer, method of using a hydraulic puller, method of using a water jet, and methods of pulling out several piles with an earth auger around the existing pile. There are methods such as digging in places and pulling out existing piles. However, with these methods, the ground around the existing concrete piles is damaged or long, and it is difficult to pull out the piles in the ground where the piles and piles are subjected to great force, resulting in poor construction efficiency and difficulty in removing the piles. It had drawbacks such as being time consuming. If the existing concrete piles cannot be easily removed using the above methods, the design of the piles for new construction work may be changed, or the above-ground portion of the building may be cut without removing the existing piles, and the dimensions may be adjusted according to each stage of root cutting. Currently, we are looking for a way to cut the pile into chunks. The present invention eliminates the drawbacks and allows any long concrete pile to be
Furthermore, existing concrete piles can be easily and efficiently removed in a short period of time on any ground. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. As shown in Figure 1, the existing foundation concrete piles 10' driven into the ground, or in the case of concrete piles according to JIS standards, are all hollow piles, and the diameter of the hollow part 11 is the outside diameter of the pile. Since the diameter is more than 1/2, the hollow portion 11 has a considerably large diameter. Therefore, the present invention utilizes the hollow portion 11 of the existing concrete pile 10 as described below. That is, as shown in FIG. 2, a guide jig 13 is attached to the central tip of the auger screw 12 of the large-capacity earth auger, and a carbide tooth tip 14 is provided at the lower end of the rotary blade of the auger screw 12.

Since the guide 13 comes into contact with the hollow part 11 of the hollow concrete pile 10 and guides the tip of the auger screw, it has a tapered side surface like a trapezoidal shape as shown in FIGS. 2 and 3. It is a simple columnar body, and has a diameter that is approximately 1/2 of the diameter of the auger screw 12.
The auger screw 12 is lowered and the guide jig 13 is applied to the hollow part 11 of the hollow concrete pile 10 that has already been driven into the ground and is to be removed.

After that, the auger screw 12 is connected to the earth auger 15.
The carbide tooth tip 14 provided at the tip of the rotary blade of the screw 12 is rotated by the hollow concrete column 10.
Crush the thick part of the In this way, auger screw 1
Since the auger screw 12 is rotated while the guide jig 13 attached to the tip of the concrete column 12 is kept in contact with the hollow part 11 of the concrete column 10 to be removed, even if a fairly long auger screw is used. However, since no lateral play occurs at the tip, the crushing efficiency of the screw at a predetermined position does not decrease.

In addition, since the tip of the screw is held constant at a predetermined layer by the guide jig 13 when the screw rotates, there is no need to plan for an excessive crushing load, so the design of the screw 12 to be used is easy. , it has great advantages such as no need to increase the drive source when implementing it. As described above, the present invention lowers the auger screw 12, which is equipped with a guard holder 13 at the center tip and has a rotary blade of the screw or a tip 14 of high hardness made of cemented carbide metal or the like at the lower end. , the guide odor pickup 13 is attached to the existing concrete pile 10
This is a method in which the existing concrete pile is crushed and removed by contacting the hollow portion 11 and then rotating the screw 12 while maintaining the contact state, so that the existing concrete pile can be removed by the above-mentioned action. For the size of the concrete pile 10, there is an advantage that the removal work can be carried out using a relatively rigid 4mm auger screw and a relatively small drive source. The shape of the guide pick-up tool 13 attached to the central tip of the auger screw 12 is designed so that it fits the tip of the hollow part 11 of the concrete pile 10 to be removed, and does not come off easily even when the screw is rotated. ,
The shape does not matter as long as it has a conical trapezoidal tip that does not get stuck in, and a base that has the required outer diameter. That is, the present invention provides a hollow obstacle 1 to be crushed at the tip of an auger screw 12 having a carbide tooth tip 14.
The side surface is tapered as a guide according to the hollow part 11 of 0.
The auger screw 12 is equipped with a guide shell 13 which is formed into a tapered columnar body and has a base diameter approximately 1/2 of the diameter of the auger screw 12.

In this way, the tip has a tapered guide deodorizing tool 13, and the guide pick-up tool 13 is attached to the hollow part 11 of the existing concrete pile 10.
Since it is possible to prevent the tip of the auger screw 12 from moving in the horizontal direction by inserting the auger screw into the auger screw 12, it is possible to easily crush a target with high strength such as concrete by using the carbide tooth tip 14.

In this way, the present invention provides that when an existing concrete pile driven into the ground impedes subsequent construction on the land, the existing concrete pile functions as a concrete pillar in the ground. The purpose is to remove the concrete pile 10, and it is not intended to remove the concrete pile 10 as if the concrete pile 10 is pulled out.

In other words, by crushing the concrete pile and thereby discarding the fact that the concrete pile maintains its function as an existing concrete pile at that location, the same effect as removing the concrete pile can be obtained in the case of extraction and removal. than,
This can be achieved with very easy work.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an existing concrete pile driven into the ground, and FIGS. 2 and 3 are sectional views of an embodiment of the removal method according to the present invention. Figure 4 shows the completed work. 10... Existing concrete pile,
11... Hollow part, 12... Auger screw, 13
... Guide jig, 14... Hard tooth tip, 15... Earth auger. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A guide jig 13 is attached to the center tip, and an auger screw having a tip 14 of high hardness provided at the lower end of the rotary blade of the screw 12 is lowered, and the guide jig 13 is lowered.
is brought into contact with the hollow part 11 of the existing concrete pile 10, and then the screw 12 is rotated while maintaining the contact state, thereby crushing the existing concrete pile 10. Removal method. 2. A tapered columnar body with a tapered side surface is formed at the tip of the auger screw 12 having the carbide tooth tip 14 as a guide corresponding to the hollow part 11 of the hollow obstacle 10 to be crushed.
The diameter of its base is approximately 1/1/1 of the diameter of the auger screw 12.
2. Auger screw 12 equipped with guide jig 13
.