JPH0542527B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a pile construction technique in which non-circular piles such as H-shaped steel or polygonal piles are erected directly into the ground while being rotated. .

<Conventional technology> For example, when constructing a foundation pile made of H-shaped steel,
First, holes are drilled to insert the foundation piles.

Next, after a foundation pile is erected into this hole, the head of the foundation pile is driven with a pile driver or the like.

<Problems to be Solved by the Present Invention> The above-described pile driving technology has the following problems.

(b) The process of opening the hole is completed first, and then the process of erecting the pile into the hole is carried out.

In this way, the hole opening process and the pile erecting process must be performed independently, which takes a long time.

(b) When the auger was removed, the hole wall of the hole that had been opened to erect the foundation pile collapsed.
Insertion of piles may become impossible.

(c) During pile driving work, the construction environment is restricted due to the generation of loud impact noise and vibrations.

(d) It is difficult to drive the piles made of H-shaped steel so that one side of the piles is aligned on the same line because the piles are likely to rotate and be driven.

(e) The work time for erecting piles on the bed of a track in use is limited to the short period from when the last train passes until the first train passes.

However, if the excavation work by the auger is not completed by the time the first train passes, the auger cannot be cut halfway, and the excavation must be repeated the next time.

(f) Japanese Patent Publication No. 53-23123 discloses a method of erecting a pile body made of H steel using a erecting device that has a function of grasping the pile and a function of preventing the pile from swinging in the horizontal direction. .

However, with this erection technique, even if it is possible to control the lateral deflection only at the top of the pile, it is not possible to control the lateral deflection at the tip of the pile body, so it is difficult to ensure the verticality of the erection.

<Object of the present invention> The present invention was made in order to solve the above-mentioned problems, and an object of the present invention is to provide the following pile construction technique.

(b) Pile erection technology that can significantly shorten the construction period.

(b) Pile construction technology that can prevent the generation of noise and vibration.

<Structure of the present invention> An embodiment of the present invention will be described below with reference to the drawings.

The present invention relates to a technique for erecting a pile body, which is directly erected into the ground by applying rotational force to a pile body provided with a digging blade at the tip.

In this embodiment, a case will be explained in which a foundation pile 1 made of H-shaped steel is erected.

First, the foundation pile 1 will be explained.

<A> Drilling blade (excavation means) The tip of the foundation pile 1 is equipped with an excavation means.

As shown in FIG. 2, the excavation means is, for example, formed by cutting off the flange 12 at the lower end of the foundation pile 1 at an acute angle.

A digging blade 13 having a saw-shaped blade formed on one side of a triangular plate is attached to the flange 12 formed at the tip by welding or the like.

In this embodiment, a case will be described in which two excavating blades 13 are attached so as to complement each other's excavating ranges.

That is, the valleys of the first excavating blade 13 pass through and the remaining soil is scraped off by the peaks of the second excavating blade 13, and so on.
Attach so that the troughs and peaks complement each other.

As the excavation means, it is also possible to employ other excavation equipment.

<B> Steady ring There is an annular steady ring 11 on the outer periphery of the foundation pile 1.
Attach multiple exteriors.

A bit 14 is provided protruding from the lower surface of the lowest steady ring 11.

<C> Discharge means for fluid such as water Bentonite liquid 4, air, etc. are placed on the foundation pile 1.
A hose 2 for supplying fluid such as mortar, various types of concrete, or a mixture thereof is attached over the entire length.

The lower end opening of the hose 2 is exposed at the tip of the foundation pile 1 to which the excavation blade 13 is attached, and discharges various fluids such as mortar and soil concrete toward the excavation surface during rotary excavation of the foundation pile 1 as described later. Configure it so that it can be done.

Note that the discharge liquid is selected depending on the purpose of construction.

<d> Driving device In order to grip and rotate the foundation pile 1, for example, an auger device 5 is used.

This auger device 5 is a known device that moves up and down while applying rotational force.

Furthermore, the chuck portion 51 for gripping the non-circular foundation pile 1 needs to be one that matches the shape of the foundation pile 1.

<E> Erecting method (1) Rotary excavation of the foundation pile The head of the foundation pile 1 is gripped by the chuck part 51 of the auger device 5, and rotation is applied to the foundation pile 1.

At this time, the bentonite liquid 4 is discharged from the tip of the foundation pile 1.

The foundation pile 1 is drilled by a drilling blade 13 and a bit 14.

In general, there is a concern that lateral vibration will occur when non-circular piles are rotated.

In the present invention, lateral vibration is regulated by covering the outer periphery of the non-circular foundation pile 1 with the anti-sway ring 11.

Therefore, even if the foundation pile 1 is rotated, it will be erected straight without causing sideways vibration.

The hole wall of the hole 3 opened by excavating the foundation pile 1 is prevented from collapsing by the bentonite liquid 4.

(2) Extension of the foundation pile After the specified size foundation pile 1 is erected to the vicinity of the erecting head, the extension pile 15 made of H-beam steel is connected via the connecting plate 16, and the work of erecting the foundation pile 1 is continued. .

Therefore, even if there is an obstacle such as a viaduct above the construction site of the foundation pile 1,
The foundation pile 1 having a length longer than the limit height can be erected while being extended.

(3) Completion of the foundation pile After the foundation pile 1 is extended and erected to a predetermined depth, the operation of the auger device 5 is stopped, and the grip on the foundation pile 1 is released from the chuck portion 51 to complete the erection work.

<Other Examples> In order to prevent the foundation pile 1 from twisting during excavation, a stiffener 17 such as a truss reinforcing bar or a short plate may be attached to an appropriate position of the foundation pile 1 in some cases.

The stiffeners 17 are installed at appropriate intervals between the flanges of the foundation pile 1, between the ribs and the flanges, etc., so as not to cause rotational resistance to the foundation pile 1.

Further, it is also possible to reduce the rotational resistance of the foundation pile by providing a hole in the plate surface of the foundation pile 1 and allowing fluidized excavated earth and the like to permeate through the hole.

Moreover, if a detachable connector is interposed in the middle of the hose 2, the hose 2 can be recovered and reused after the construction is completed.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

(b) In the conventional construction method, the building was built on piles after pre-boring.

The present invention makes it possible to directly erect piles without the need for this pre-boring process.

Therefore, the work time required for assembling and disassembling the auger is no longer necessary, so the construction period can be significantly shortened.

(b) Since the piles are erected by rotating them, impact noise and vibrations are not generated as in the conventional method.

Therefore, it can be used for construction work in quiet residential areas, and there is no need to worry about noise pollution.

(c) When it is desired to build a building with one side of non-circular piles aligned, it is easy to align the sides because the piles can be rotated freely.

(d) It can be used for erecting H-shaped steel, box-shaped steel, and various types of non-circular piles, making it highly versatile.

(e) In railway construction, if pile erection is not completed within the working time, the piles may be cut midway and the erection work may be interrupted so as not to affect the running of trains.

Further, even if the pile is cut midway, the pile erection work can be continued without any hindrance when restarting the pile erection work.

[Brief explanation of drawings]

Figure 1: Explanatory diagram when erecting foundation piles, Figure 2:
Explanatory diagram of the tip of the foundation pile, Figure 3: Explanatory diagram of the extension of the foundation pile.

Claims (1)

[Claims] 1. A non-circular pile body is provided with an excavation means at the tip of the pile and is surrounded by an annular steadying ring along the longitudinal direction of the pile, and fluid is discharged from the tip of the pile body. At the same time, the pile body is rotated to excavate at the tip of the pile, and an extension pile body is connected to the base end of the pile body, and the pile itself controls lateral vibration through a steadying ring and reaches a predetermined level. A pile installation method that involves drilling a hole to the depth and erecting the pile.