JPS63103122A - Driving of pile into rubble layer - Google Patents

Abstract

PURPOSE:To permit the construction work with piles of low strength to be performed by driving piles with high driving accuracy without the needs for operations to remove great rocks, etc., by a method in which a pit is excavated in the rubble layer by using an auger screw with casing. CONSTITUTION:An auger screw 1 and a casing 2 are mutually turned in the opposite direction, and a pit is excavated in a rubble layer 5 by means of a cuter 3 and a blade 4 to remove rubble in the place where a pile is to be driven. Only the auger screw 1 is pulled out, a pile 6 is driven into the casing 2, and a filler 7, e.g., sand, cement mortar, etc., is packed into the space between the inner surface of the casing 2 and the periphery of the pile 6 from the ground's surface. The casing 2 is then drawn out. The pile 6 can thus be exactly driven to the lower part of the rubble layer 5 so excavated, permitting even piles 6 of low strength to be constructed and any kind of the filler 7 to be selected to obtain piles of high strength.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for driving piles into a rubble layer.

[Prior art]

When driving piles into normal ground, use a diesel hammer,
Piles are driven using a driving machine such as a vibro hammer, but if the ground is a rubble layer containing large rocks, it is impossible to drive piles using the above-mentioned driving machine as is. It is.

Conventionally, when driving piles into such a rubble layer, large rocks are removed using a grab bucket, etc.
Thereafter, the piles were driven using the above-mentioned driving machine.

Additionally, if it was impossible or extremely difficult to remove large rocks, consideration had to be given to driving piles elsewhere in the design.

However, removing large rocks requires a great deal of effort, and especially when a large number of piles are to be driven, the effort required is enormous.

Further, if the design allows driving the piles in other locations, there is no problem, but such a design change is not always allowed.

Therefore, in order to solve the above problem, a vertical hole was excavated in the rubble layer using a rotatable cylindrical casing with a ground excavation blade formed at the tip and an auger screw fitted inside the casing. Then, only the auger screw is removed, replacement sand is poured into the remains to form a sand pile, and then the casing is removed and the pile is driven into the sand pile to remove large rocks. Japanese Patent Publication No. 17972/1983 has been made regarding a method for driving piles into a rubble layer using a conventional driving machine such as a diesel hammer or a vibro hammer.

However, in the above method, after putting replacement sand into the casing to form a sand column, the casing is removed,
Since the piles are driven into the sand piles, both sand pile construction accuracy and pile driving accuracy are required, making it difficult to obtain accurate pile driving accuracy, and using filler materials other than sand. There was a problem that it was difficult to use mortar etc.

[Purpose of the invention]

The present invention solves the above-mentioned conventional problems, and makes it possible to easily drive piles into the rubble layer using a normal driving machine without the need for removing large rocks using a grab bucket or the like. The purpose of the present invention is to provide a pile driving method for a rubble layer that enables pile driving membranes with high driving accuracy, allows changing the filling material, and allows construction even with piles with low member strength. This is what I did.

[Structure of the invention]

In order to achieve the above object, the method of driving piles into a rubble layer according to the present invention involves excavating a vertical hole in a rubble layer using an auger screw with a casing having a cutter for ground excavation at the tip, and then extracting only the auger screw. , a driven pile is driven into the driven pile, a filler material is filled between the casing and the driven pile, and then the casing is removed.

〔Example〕

The present invention will be described in detail below with reference to the drawings, and FIGS. 1 to 8 are a series of steps illustrating an embodiment of the piling membrane method of the present invention for piling membranes on rubble layers. FIG.

First, on the desired ground G of the rubble layer 5 where the piling membrane is to be applied,
Set the auger screw 1 and casing 2, rotate the auger screw 1 and casing 2 in opposite directions,
As shown in FIG. 1, the cutter 3 at the tip of the auger screw l and the blade part 4 at the tip of the casing 2 cut into a rubble layer 5.
A vertical hole is excavated in the area, and rubble from the pile driving area is removed as shown in Figure 2.

Next, as shown in FIG. 3, leave the casing 2 as it is and remove only the auger screw 1, and drive the driving pile 6 into the casing 2 as shown in FIG.
As shown in FIG. 5, between the inner periphery of the casing 2 and the outer periphery of the driven pile 6, sand, mortar, or other predetermined filler 7 is filled from the ground G, resulting in the state shown in FIG.

Then, as shown in FIG. 7, the casing 2 is removed, and the piling membrane shown in FIG. 8 is completed.

According to the pile driving method consisting of the above-mentioned steps, when the driven pile 6 is driven, the casing 2 remains, and the filler material 7 is not yet filled, and the driven pile 6 is placed under the previously excavated rubble layer 5. This allows for reliable and accurate driving.

Furthermore, in this case, since the filler 7 is filled after driving the driven pile 6, construction can be performed even with the driven pile 6 having a low member strength, and the outer periphery of the driven pile 6 can be filled with any type of filler 7 other than sand. ,
For example, filling with mortar is also possible, and high-strength piles will be driven.

〔Effect of the invention〕

As explained above, if the pile driving method of the present invention is adopted, it is not necessary to remove large rocks using a grab bucket or the like even in the rubble layer, and piles can be piled using a normal driving machine. It is possible to easily drive piles with high driving accuracy, and the filling material can be changed, and even piles with low member strength can be used for construction.

Furthermore, in the pile driving membrane method of the present invention, the outer periphery of the driven pile is filled with sand after driving the pile, so the advantage is that the amount of sand used for filling can be reduced by the amount of the driven pile. There is.

[Brief explanation of the drawing]

FIG. 1 to FIG. 8 are a series of side sectional views illustrating the steps in one embodiment of the method for driving piles into a riprap layer according to the present invention. 1... Auger screw, 2... Casing, 3
... cutter, 4 ... blade part, 5 ... rubble layer, 6.
... Driven pile, 7... Filling.

Claims (1)

[Claims] After drilling a vertical hole in the rubble layer using an auger screw with a casing that has a cutter for ground excavation at the tip, remove only the auger screw, drive a driven pile into it, and fill it between the casing and the driven pile. A method of driving piles into a rubble layer where the casing is removed after filling with material.