JPH1072825A - Construction method of footing pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient and economical construction method with low vibration and low noises by making the best use of the function and characteristics for a footing pile adding a knotted pile to a steel pipe pile. SOLUTION: In this construction method of a footing pile, a knotted pile 1 and a steel pipe pile 2 are connected in the longitudinal direction in the head section of the knotted pile 1. A hitting device such as hammer 4, etc., is inserted into the steel pipe pile 2, and the head section of the knotted pile 1 is hitted from the inside of the steel pipe pile 2 to drive the knotted pile 1 and the steel pipe pile 2 connected thereto simultaneously in the ground 10. In the case of driving, the circumference of the footing pile consisting of the knotted pile 1 and steel pipe pile 2 is filled with a filler 3 such as sand, gravel, crushed stone, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a foundation pile formed by joining a nodal pile and a steel pipe pile in a longitudinal direction.

[0002]

2. Description of the Related Art As a construction method for constructing a knotted pile having knotted protrusions on the outer periphery of a pile, a method of hammering the knotted stone into the ground with a hitting means such as a diesel hammer while filling the knotted pile with the crushed stones is used. It is the easiest and most economical way to go by. However, due to problems such as vibration and noise, a method of digging and embedding a hole in advance has become mainstream.

[0003] On the other hand, the use of a double-pipe type casing, drilling by a casing that also serves as an auger, and hitting in the casing together with low vibration and low noise are intended to prevent liquefaction. A method called the crushed stone crushed stone drain method has been developed.

[0004] On the other hand, when adding a pre-made pile in the longitudinal direction,
Conventionally, the same type of ready-made stakes were usually added. However, Japanese Patent Application Laid-Open No. Hei.
No. 6 discloses a structure in which a cylindrical pile such as a steel pipe pile is joined to the upper part of a concrete knotted pile. This is a longitudinal connection between piles with different pile performance, such as steel pipe piles that cannot be expected to have large peripheral bearing capacity but have large bending strength, and knotted piles that cannot be expected to have much bending strength but have excellent peripheral bearing capacity. It is.

[0005] Although different depending on the condition of the ground and the relationship with the upper structure, in the most common form, a relatively large bending strength is required in the upper ground against an earthquake or the like, and the peripheral bearing capacity in the lower ground is required. Vertical support capacity is required,
In that sense, the foundation pile according to the invention has a reasonable structure.

[0006] In this publication, as an example of the construction method,
There is described a case in which the foundation pile is added by a hitting means such as a diesel hammer while being added, and a case in which the foundation pile is constructed by a pre-drilling method such as a cement milk method.

[0007]

A knotted pile made of concrete or the like is the simplest construction method because it is strong against a vertical load and a hitting force in the vertical direction. There is a problem of vibration and noise, and construction in residential areas is restricted.

[0008] Further, in a state where a steel pipe pile is added upward,
If a striking force is applied to the head, a portion of the steel pipe pile may be deformed, and it may become impossible to drive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a low-vibration, low-noise efficient and economical low-noise and low-noise foundation pile made up of a joint pile and a steel pipe pile. The purpose is to provide an efficient construction method.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a method for constructing a foundation pile in which a knotted pile and a steel pipe pile are joined in the longitudinal direction at the head of the knotted pile. Into the steel pipe pile connected to the knotted pile, and hitting the head of the knotted pile from inside the steel pipe pile, thereby simultaneously casting the knotted pile and the steel pipe pile connected to it into the ground It is characterized by.

In the present invention, the impact for driving the pile is such that the steel pipe pile is hit on the bottom and the knot pile is hit on the head, but the hitting force is directly applied to the head of the knot pile. However, the present invention is not limited to this case, and there may be something intervening.

There are various types of joints between the knotted pile and the steel pipe pile, but the simplest one is to provide an end plate made of a steel plate or the like at each pile end and connect the end plates by welding. Formats can be used. In addition, a screw type joining means or the like can be used.

Although these piles can be joined in advance before driving, they can be added sequentially as the driving of the pile proceeds. In the latter case, prior to the joining of the steel pipe piles, the construction of the knotted piles is simply performed, and various conventionally known construction methods for knotted piles can be used and used together.

In the case of knotted piles, sand, gravel, crushed stones, and other fillers are provided on the outer periphery of the pile for the purpose of ensuring workability, securing the frictional force on the peripheral surface, and forming drainage channels for preventing liquefaction. Is often filled, and claim 2 of the present application limits that case.

[0015]

1 (a) to 1 (d) show a construction procedure in one embodiment of a method for constructing a foundation pile according to the present invention.

First, the knotted pile 1 is sanded, gravel,
It is poured into the ground 10 to a predetermined depth while filling the filler 3 such as crushed stone. It is possible to use a hammer such as a diesel hammer or a drop hammer for this casting.However, in places where low noise and low vibration are required, the casting is performed by embedding, excavation, or crushed stone drainage method. (See FIG. 1 (a)).

Next, a steel pipe pile 2 is joined to the head of the knotted pile 1 which has been driven to a predetermined depth, and the head of the knotted pile 1 is hit with a hammer 4 such as a drop hammer inserted into the steel pipe pile 2. Into the ground 10 (see FIGS. 1 (b) and 1 (c)).

By driving to a predetermined depth, the knots 1
The construction of the foundation pile 1 composed of the steel pipe pile 2 and the steel pipe pile 2 is completed (Fig. 1
(d)).

In the above-mentioned example, only the knotted pile 1 is first set and then the steel pipe pile 2 is connected. However, the steel pipe pile 2 is connected in advance and the ground pile 10 is set. It is also possible to do.

Although FIG. 1 shows a case where each of the joint pile 1 and the steel pipe pile 2 is one, a plurality of joints are added in the longitudinal direction as necessary.

FIG. 2 shows an example of a foundation pile used in the present invention. A lower knot pile 1 has a plurality of knot-like projections 1a formed on the outer peripheral surface, and end plates 1b and 1c are provided at lower and upper ends. It is attached. The illustrated example is made of concrete, but may be a composite pile or the like. The upper steel pipe pile 2 is provided with an end plate 2a for connection with the knotted pile 1 at the lower end of a normal steel pipe pile so that it can be joined by welding, but the structure of the joint is not limited to this. .

FIGS. 3 (a) and 3 (b) show the form of the foundation pile used in the present invention, and FIG. 3 (a) is similar to FIGS.
This is a case where the outer diameter of the knot-like projection 1a of the knot 1 is larger than the outer diameter of the steel pipe pile 2. FIG. 3B shows a case where the outer diameter of the knot-like projection 1a of the knotted pile 1 and the outer diameter of the steel pipe pile 2 are substantially equal. ing.

[0023]

According to the present invention, a hitting force is applied to a joint pile and a steel pipe pile connected in the longitudinal direction by a striking means inserted into the inside of the steel pipe pile. Since the pile has sufficient compressive strength against vertical load, it can be driven efficiently without breaking. On the other hand, since the upper steel pipe pile has a shape of being pulled into the ground by driving in a nodal pile or a bottom striking shape, the force acting on the steel pipe pile is a tensile force, and there is no possibility of breakage.

Since the impact is performed at the inner bottom of the steel pipe, low noise and low vibration can be performed.

From the relation between the striking force or the number of striking times and the pushing amount, etc., it is possible to confirm the supporting force for each foundation pile.

Since the pile is driven by the impact force, a large supporting force can be obtained as compared with the embedding method or the like.

[Brief description of the drawings]

1 (a) to 1 (d) are vertical sectional views showing a construction procedure in an embodiment of a method for constructing a foundation pile according to the present invention.

FIG. 2 is a vertical sectional view showing an embodiment of a foundation pile used in the present invention.

3 (a) and 3 (b) are vertical sectional views showing different forms of a foundation pile used in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Knotted pile, 1a ... Knotted projection, 1b, 1c ... End plate, 2 ... Steel pipe pile, 2a ... End plate, 3 ... Filler, 4 ... Hammer, 5 ... Connection pipe, 10 ... Ground

Claims (2)

[Claims] 1. A knot pile and a steel pipe pile each having a knot-shaped protrusion formed on the outer periphery of the pile, and joined in a longitudinal direction at a head of the knot pile,
By inserting a pile hitting means into the steel pipe pile and hitting the head of the node pile from inside the steel pipe pile, the node pile and the steel pipe pile connected to the node pile are simultaneously driven into the ground. Construction method of foundation pile characterized by going. 2. The method for constructing a foundation pile according to claim 1, wherein a filler such as sand, gravel or crushed stone is filled in the outer peripheral portions of the joint pile and the steel pipe pile joined in the longitudinal direction.