JPH0235187A - Execution device for foundation pile - Google Patents

Abstract

PURPOSE:To make a rigid pile easily executable by connecting an auger head, provided with a screw blade piece additionally, to the lower part of an auger rod, and further connecting a leading cutter with a drilling screw to the lower side. CONSTITUTION:A conical auger head B, whose outer circumferential surface is conical, provided with a screw blade piece additionall, is connecting to the lower part of an auger rod A of almost regular triangle form in cross section, slightly bulging each surface part outward, free of separation and connection. In addition, a leading cutter C with a drilling screw 11 is connected to the lower side. Then, the auger rod A is rotated, and a pile hole is drilled by the screw blade piece of the auger head B as excavating the ground with the leading cutter C, and digged soil is spread and pressed to a hole peripheral wall at a conical incline. In addition, this hole peripheral wall is yet more pressed strongly on a triangular bulged surface of the auger rod A. In this connection, a combination of those of auger rod A, auger head b and leading cutter C is properly changed according to conditions of excavated ground or the like.

Description

[Detailed description of the invention] [Industrial application field] The present invention is a foundation ground improvement method that firmly compacts the soil around the excavation hole, and can form an excavation hole of any depth or depth without removing soil and without sound or vibration. This is a foundation pile construction device that can be used to easily and reliably excavate foundation piles.

[Conventional technology]

Conventionally, when constructing foundation piles in the ground silently and without vibration, a hole is first drilled in the ground using an auger drilling machine, and a ready-made pile is driven into the pile hole, or The ground was being improved by adding coagulant.

[Problem to be solved by the invention]

In the case of the above-mentioned ground drilling method, since the ground is drilled with a large-diameter auger, not only does the soil around the pile hole unnecessarily loosen and collapse, but also a huge amount of soil is thrown onto the ground during drilling. Lifting up, accumulating, and disposing of the soil required considerable labor and expense.

In order to solve this drawback, the inventor first proposed patent number 1.
In No. 136177 and No. 1153361, a construction device was invented in which an extrusion edge is formed in a local part of the screw blade, and the excavated soil is compressed against the circumferential wall of the hole during excavation to solve the problem of soil discharge to the ground. It is already well known that this is widely used in the industry.

However, in such a construction method, the softness and hardness of the geology.

Depending on depth and shallowness conditions, it may be able to effectively function as a screw extrusion edge, but on the other hand, the purpose of the extrusion edge around the screw is to extrude the circumference of the hole. It was found that considerable load resistance was generated during rotation.

The present invention attempts to solve the above-mentioned drawbacks to a large extent, and
The main purpose is to immediately adapt to deep and shallow conditions and provide reliable ground improvement construction.

[Means to solve the problem]

In order to achieve the above object, in the foundation pile construction device of the present invention, a connecting portion is provided below the auger rod A having a substantially equilateral triangular cross section with each surface portion slightly bulging outward,
An auger head B having a conical outer circumferential surface and attached with screw blades having an outer circumferential edge having approximately the same diameter as the rotation locus of the auger rod A is connected to the connecting portion so as to be separable and joinable, and further The auger rod A and the auger rod B are connected to the lower part of the auger head B with a screw wing piece and a tip cutting blade C having a tip digging cutting blade.

It is characterized in that the pre-digging blades C are arbitrarily changed and connected up and down according to the conditions of the excavated ground, etc., so as to excavate a predetermined ground.

[For production]

Advantages of the present invention With a device having the above configuration, the loft is rotated, and while the ground is pre-dug with the pre-digging blade C, a pile hole is dug with the screw blade of the auger head B, and at the same time, the pile hole is shaped into a conical shape. The soil in the borehole is expanded and compacted on the circumferential wall of the hole using the inclined surface, and the circumferential wall of the hole is more strongly compressed using the triangular bulging surface of the upper auger rod A.

〔Example〕

The following is a detailed explanation of the drawings illustrating embodiments of the present invention.The apparatus of the present invention can be roughly divided into auger rods A1, A1, and A1 having an ejection function. It is composed of a digging hole, a pile hole, an auger head B for pressing out, and a cutting blade C for digging into the ground, each of which can be separated and connected as necessary.

As shown in the cross-sectional view, the auger rod A is formed of a steel rod (1) with a substantially equilateral triangular cross-sectional shape over its entire length, with each triangular surface portion (1) extending slightly outward in a circle. The rod (1) is formed in a bulge shape and is integrally provided with a connecting portion (2) having a substantially conical tapered surface (2) below the rod (1).

Further, the connecting portion (2) has a connecting hole and mortar.

There are several injection holes (3) for air, water, etc.

In the above embodiment, the wood (1) is triangular in shape, but it may be considered to have a polygonal modified shape such as a square or a triangle in some cases.

In the illustration, the reference numeral (4) is a water hole that runs vertically through the rod and communicates with the injection hole (3), and Q43 is the rod (1).
The upper connecting part is shown. The auger blade B has a head (5) whose entire lower part is formed by a tapered surface (5) having a substantially conical shape, and the upper head portion <d is formed in a triangular shape between the shape of the wood (1) and the groove. A connecting portion (6) with the rod (1) is provided in the inner shaft center portion.

In addition, screw blades (7) with approximately the same diameter on the top and bottom are attached over the entire length of the conical exterior, and a tip-boring blade (8) is attached to the lower part of the head.
A connecting portion (9) is provided.

The pre-drilling portion C has a connecting portion DI with the auger head B (9) formed at the top, and a hole screw αη having approximately the same outer circumference as the head scree blade (7) at the local part of the shaft. In addition, several pre-digging blades (8) are formed below to propel the ground.In addition, (2).

@ is a joint hole for connecting each part.

The foundation ground construction device according to the present invention has the above-mentioned structure, and the auger rod A
1 Auger rod B, each connection part of the previous JIC (2), (6
), (9), α1, α-shank, etc. are used by separating and connecting them arbitrarily, for example, as shown in the first diagram, auger rod A, auger rod B1 and tip cutting blade C are attached below, or auger rod A is used. Directly attach the tip cutting blade C to the top of the auger rod A, or attach the auger head B to the top of the auger rod A.
Furthermore, as shown in FIG. 4, it is also possible to connect several auger heads B, B below the auger rod A depending on the hardness of the ground or the like.

In addition, these connection and separation operations are performed at each connection part (2) and (9).
, (13), it goes without saying that this is done through the joint holes (3), 4, and (13) using fastening fittings such as bold metal fittings.

〔Effect of the invention〕

In the above configuration, the present invention connects each of the above parts,
This is connected to a pile driver (not shown) in a hanging manner to combine the power, and the tip of the ground is propelled by the tip digging blade C.

In addition, as the excavation progresses, the screw blade αη on the upper part of the pre-excavation blade C
The holes are drilled using the screw blades (7) of the auger head B, but these excavated soil are affected by the action of the conical tapered surface (5) of the auger head B and the conical tapered surface (2) below the rod (1). The circumferential wall of the hole is expanded and pressed firmly, and at the same time, the circumferential wall of the hole to be compressed is pressed by the rotating action of the triangular surface portion (1) formed on the head upper part (5) and the curved surface of the rod (1). Furthermore, it is possible to form a strong pile hole in the ground with a strong coining and with almost no resistance, very simply and easily.

By separating and connecting each mechanical part depending on the ground conditions, it is not only possible to create a strong hole circumference only in the parts that are needed each time, but it is also possible to construct pile holes of any depth or shallowness. It also has some tremendous effects.

[Brief explanation of the drawing]

The drawings show a foundation pile construction device according to the present invention, where Figure 1 is a front view, Figure 2 is the same as above, a slope view, Figure 3 is a cross-sectional view of the rod part, and Figure 4 is another application example of the connected body. This shows that.・】゛Mill 1.4 2nd Me 1 u! 4', A Code explanation A Auger rod B Auger head C Tip cutting blade

Claims (1)

[Claims] A connecting portion is provided below the auger rod A, which has a substantially equilateral triangular cross section with each surface slightly bulging outward, and the connecting portion has a conical outer peripheral surface, and the auger rod A is rotated. An auger head B having screw blades having an outer circumferential edge having approximately the same diameter as the locus is connected so as to be separable and joinable, and further has a screw blade and a pre-excavation cutting blade below the auger head B. The foundation is characterized in that the auger rod A, auger head B, and tip cutting blade C are connected in arbitrary vertically changing combinations according to the conditions of the excavated ground, etc., so as to excavate a predetermined ground. Pile construction equipment.