JP2001152449A - Reaction body for pile and burying construction method for the pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reaction body for a pile, by which the pile can obtain reaction in the lateral direction, even from a disturbed ground after the pile is placed and the tensile strength of the pile can be displayed effectively especially when the pile is made of steel, and the burying construction method of the pile. SOLUTION: The reaction body for the pile has a pipe body 21 for fitting onto an outer circumference at the upper end of the pile 11, and a plurality of reaction plates 22 fixed to the external surface of the pipe body, so as to be extended in the axial direction for obtaining reaction in the lateral direction from a ground, and a reinforcing plate 31 is welded at the upper ends of the pipe body and the reaction plates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile reaction body and a method of burying a pile so that the pile can obtain a lateral reaction force from the ground.

[0002]

2. Description of the Related Art Steel materials have strong physical properties with respect to both tensile force and compressive force, and are also suitable for pile materials because of their high viscosity. Conventionally, steel materials have been used as steel pipe piles. However, in particular, in a small steel pipe pile having a diameter of about 100 to 300 mm, although the steel pipe pile is used mainly for the purpose of bearing the vertical supporting force by paying attention to the compressive strength, the steel pipe pile has the tensile strength. It is rarely used in applications. This is because, in many cases, a steel pipe pile is provided with an excavation blade for rotary press-fitting on the outer periphery, and the excavation blade excavates the ground around the steel pipe pile, and the pile has a small apparent cross-sectional area. Therefore, it was difficult to obtain a lateral reaction force from the ground where the pile was disturbed.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to enable a pile to obtain a reaction force in the lateral direction even from the disturbed ground after the pile has been cast. In some cases, it is an object of the present invention to provide a pile reaction body and a pile burying method capable of effectively exerting the tensile strength of a pile.

[0004] Another object of the present invention is to provide a reaction member for a pile capable of obtaining a good adhesion to the foundation concrete and increasing the transmission efficiency of a vertical load from the foundation to the pile. The aim is to provide a method of burying piles.

[0005]

According to the present invention, there is provided a pipe for fitting around the upper end of a pile driven into the ground and an outer surface of the pipe for obtaining a lateral reaction force from the ground. There is provided a pile reaction body including a plurality of plate bodies as reaction force plates fixed so as to extend in the axial direction.

[0006] The reaction member for a pile according to the present invention may include a reinforcing plate fixed to an upper end surface of the tube and an upper end surface of the plate. By arranging the reinforcing plate in this way, the reinforcing plate is buried in the foundation concrete, so that the reaction member for the pile can obtain a good adhesion to the foundation concrete, and the foundation can be reinforced through the reinforcement plate. The transmission efficiency of vertical load from pile to pile also increases.

Here, the plurality of reaction force plates may be arranged in such a number and number that a reaction force from the ground can be obtained irrespective of the force transmitted from the pile in any direction. It is preferable to fix the plate members to the tube so as to be located in two directions orthogonal to each other.

Further, according to the present invention, a pile is driven into the ground,
A pile reaction body, in which a plurality of plates are extended in the outer surface axial direction of the pipe, is fitted on the outer periphery of the upper end of the pile, and pressed into the ground without rotating the pile reaction body, There is provided a pile burying method including a step of casting concrete to form a basic footing so that an upper end of the pile and an upper end of the pile reaction body are integrated.

In the pile burying method according to the present invention, the pile reaction body may be a pile reaction body having a reinforcing plate fixed to an upper end surface of the pipe and an upper end surface of the plate body. Can be.

The embedding method and the reaction member for piles of the present invention can be applied to a steel pipe pile having an excavation blade at the lower end. As such a steel pipe pile, for example, approximately の of the lower end cross section of the pile body made of a steel pipe is formed at a different inclination angle, and at an inclination angle that is not orthogonal to the pile body axis direction but intersects, A plate body is welded so as to extend coaxially at substantially the center of the lower end section of the pile body to form an axially projecting blade, and each of the two rectangular plate bodies larger than the substantially half lower end section is formed. About half on the surface
The steel pipe pile may be characterized in that the lower end cross sections of the steel pipe piles are welded to each other to form radial projecting blades on both sides of the axial projecting blade.

The pile to which the burying method and the pile reaction body of the present invention can be applied is not limited to a steel pipe pile.
It is also applicable to concrete piles.

[0012]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of a reaction member for a pile according to the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 and 2, a pile reaction body 20 includes a tube 21 made of a steel pipe and four reaction plates 2 fixed to the outer surface of the tube 21 so as to extend in the axial direction.
Each reaction force plate 22 is made of a steel plate, and is fixed to the tube 21 by welding so as to be positioned in two orthogonal directions.

FIG. 3 is a front view of a pile reaction body 30 different from the above, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. Here, in addition to the configuration of the tube 21 and the reaction force plate 22 in the pile reaction force body 20, the pile reaction force body 30 includes a reinforcing plate 31 made of a steel plate, The power plate 22 is fixed to the upper end surface by welding.

Next, a method of burying a pile using a pile reaction member will be described with reference to FIG. First, the pile 10 is driven into the ground while rotating. Then, the pipe 21 of the pile reaction body 30 is fitted to the outer periphery of the upper end of the pile 10, and the pile reaction body 30 is pressed into the ground without rotating. Next, concrete is poured so as to surround the upper end of the pile reaction body 30, thereby constructing the basic footing 40 as shown by the dashed line in FIG. Thereby, the reaction member 30 for piles and the footing 40
And are integrated. When a digging blade is provided on the outer periphery of the pile 10, prior to the press-fitting of the pile reaction body 30,
A cement liquid may be injected into the ground disturbed by the excavation blade to improve the ground strength.

In the above-mentioned pile 10, when a lateral external force acts on the structure via the foundation footing 40, the reaction plate 22 of the pile reaction member 30 obtains a lateral reaction force from the ground. Therefore, the earthquake resistance of the structure can be improved. Also, a pile 1 provided with the above-mentioned pile reaction member 30.
At 0, the concrete of the foundation footing 40 is filled particularly below the reinforcing plate 31, so that the adhesive force between the pile reaction force body 30 and the foundation footing 40 is increased, and the pile reaction force body 30 is removed from the structure. The transmission efficiency of the vertical load to the pile 10 via the pile is also increased.

Next, a steel pipe pile 10 will be described with reference to FIGS. 6 and 7 for an embodiment of a pile to which the reaction member 20 or 30 for piles is attached. FIG. 6 is a front view showing the steel pipe pile 10 on which the pile reaction body 30 is fitted, and FIGS.
(C) is the front view, the side view, and the figure seen from the lower part of the steel pipe pile 10, respectively. 6 and 7, the steel pipe pile 10
Is a pile main body 11 made of a steel pipe, an axial protruding blade 14 extending coaxially from the center of the lower end of the pile main body 11, and welding on both sides of the lower end of the pile main body 11 sandwiching the axial protruding blade 14. And the radially extending protruding blades 12 and 13.

The pile body 11 has lower end sections 11a and 11a.
b is different from each other by approximately 1/2, and
It is not perpendicular to the axial direction of the pile body, but is formed by cutting at two intersecting inclination angles. That is, the lower end sections 11a and 11b have
When the surfaces of the steel plates constituting the radially projecting blades 12 and 13 are abutted and fixed, these radially projecting blades 12 and 13
The lower end cross sections 11a and 11b are formed so as to have the inclination angles α and β as shown in FIG.

The radial projecting blades 12 and 13 are arranged as shown in FIG.
As shown in FIG. 3, two rectangular steel plates having a long side almost twice as long as the steel pipe diameter D and a short side almost the same length as the steel pipe diameter D are used, and the lower end cross sections 11a and 11b of the pile body 11 are shown in FIG. In the arrangement shown by the dotted line in FIG. 3, each of the steel plates is brought into contact with the surface of the steel plate and fixed by welding 15, and the central portion of the long side of each steel plate is brought into contact with both surfaces of the axially projecting blade 14, respectively. And fixed by welding 16. The axially projecting blade 14 can also be formed of a rectangular steel plate.

When the steel pipe pile 10 is driven into the ground, the radial protruding blades 12 and 13 receive a resistance force from the ground.
Since the lower end sections 11a and 11b are fixed, the radially protruding blade 1 is formed by the reaction force from the lower end sections 11a and 11b.
2, 13 are supported, and their deformation is suppressed. Therefore, relatively good straight running performance is obtained in the steel pipe pile 10.

[0020]

According to the present invention, there is provided a pile reaction body in which a plurality of reaction plates are fixed so as to extend in the axial direction on the outer surface of the pipe, and the pile reaction body is driven into the ground. If the pile is driven by being fitted around the upper end of the pile, the pile can obtain a reaction force in the lateral direction from the ground. In particular, the pile can obtain a lateral reaction force even from the ground that was dug up and disturbed by driving the pile,
In particular, when the pile is made of steel, the tensile strength of the pile can be effectively exhibited.

[Brief description of the drawings]

FIG. 1 is a front view of a reaction member for a pile according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a front view of a pile reaction body different from FIG. 1;

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a front view of a reaction member for a pile that is externally fitted to an upper end of the pile.

FIG. 6 is a front view showing a steel pipe pile on which a pile reaction body is fitted.

7 (a) to 7 (c) are a front view, a side view, and a view seen from below, respectively, showing an embodiment of the pile in which the pile reaction body of FIG. 3 is externally fitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Steel pipe pile 11 Pile main body 20 and 30 Reaction body 21 for pile 21 Pipe 22 Reaction plate 31 Reinforcement plate

Claims (4)

[Claims] 1. A pipe for fitting around the upper end of a pile driven into the ground, and a pipe fixed to an outer surface of the pipe so as to extend in an axial direction on an outer surface of the pipe to obtain a lateral reaction force from the ground. A reaction member for a pile comprising a plurality of plate members as force plates. 2. The pile reaction member according to claim 1, further comprising a reinforcing plate fixed to an upper end surface of the tube and an upper end surface of the plate. 3. A pile reaction device, in which a pile is driven into the ground and a plurality of plates are extended in the axial direction of the outer surface of the pipe, is fitted on the outer periphery of the upper end of the pile, and the pile reaction device is mounted on the pile. Embedding a pile including a step of forming a foundation footing by pressing concrete into the ground without rotating a force body and casting concrete so as to integrate an upper end of the pile and an upper end of the reaction body for the pile. Construction method. 4. A pile reaction force body in which a reinforcing plate is fixed to an upper end surface of the pipe and an upper end surface of the plate body is used as the pile reaction force body. Pile burial method.