JPS61250230A - Method and apparatus for breaking prefabricated concrete pile - Google Patents

Abstract

PURPOSE:To easily remove defective piles by a method in which a breaker whose tip is attached to the lower end of its stirring rod is penetrated into the hollow of a defective pile to break and stir concrete, and reinforcing bars, etc., are removed. CONSTITUTION:The tip 2 of breaker, consisting of a claw 2a for crushing a pile and a penetration guide for the hollow the pile, is provided to the lower end of a stirring rod 1 with a stirring blade 1a to form a breaker A. The tip 2 of the breaker is set on the head of a defective concrete pile B, and the pile B is broken by the claw 2a while guiding the center of the pile with the guide 2b, and the broken pieces are stirred by the rod 1. The breaker A is pulled up after being advanced to the tip of the pile, and cement milk is injected from a discharge port 2c when pulling up the breaker A as needed. Reinforcing bars, PC steel wires, etc., entangled with the stirring blade 1a, etc., are cut off by gas for removal.

Description

[Detailed description of the invention] Industrial field of application The present invention is used to remove defective piles such as piles that remain high in the pile embedding method, or twisted and broken piles in the rotary embedding method. This article concerns a method for crushing ready-made concrete piles and its equipment.

Conventional technology In the past, defective piles that occurred after construction, such as pile embedding, etc., due to pile embedding, pile twisting, etc., were fixed by changing the pile core position due to design changes or by pulling out defective piles. .

Problems to be Solved by the Invention All of the above conventional methods involve extensive work that requires a great deal of expense and labor.

Means for Solving the Problems The present invention provides a special ready-made concrete pile having a stirring rod having an appropriate number of stages of stirring blades in the upper part, and a crusher tip part consisting of a pile crushing pawl and a pile hollow entry guide in the lower part. A crusher is used to crush Nera's ready-made concrete using a regular pile driver.

The above-mentioned ready-made concrete crusher can be operated by a normal pile driver, and the crusher enters the hollow part of the Nera pile using the pile hollow entry guide and crushes the ready-made concrete with the pile crushing pawl. , the fragments are stirred by the stirring blades of the stirring rod.

Embodiment FIG. 1 is a front view showing one example of the ready-made concrete crusher of the present invention. The tip of the crusher consists of a pile crushing pawl 2a and a pile hollow entry guide 2b at the lower end of a stirring rod 1 having a stirring blade 1a. 2 is provided. 2c is a tip milk discharge port, and 1b is a bottle fixing hole.

FIG. 2 shows an example of the ready-made concrete pile crushing device of the present invention, where A is the crusher of the present invention, B is a defective concrete pile, C is an auger drive device, and D is a pile driver main body.

Figure 3 shows the order of the crushing process. 2) The tip of the crusher is set on the top of the pile.

(B) Guide the center of the pile using the pile hollow entry guide and destroy it using the pile crushing pawl.

(q. Stir the debris with a stirring rod.

(b) Pull up the crusher after reaching the tip of the pile.

In this case, in order to prevent the inner wall of the crushing hole from collapsing, a poorly mixed cement milk may be injected from 2C in FIG. 1 to fill the hole when it is pulled up.

(g) Reinforcing bars, PC steel wires, etc. are tightly attached to stirring blades, etc., so remove them by gas cutting.

Effects of the Invention According to the present invention, it is possible to dispose of defective piles by simply replacing the tip of the crusher using an ordinary pile driver at the site without requiring extensive pile extraction. arise.

[Brief explanation of the drawing]

The drawings show one example of carrying out the present invention, and FIG. 1 is a front view of the main parts, the tiz diagram is a schematic diagram of the apparatus, and FIG. 3 is an explanatory diagram of the process order. The symbols in the drawings indicate the following members, respectively. 1: Stirring rod 2: Crusher tip A: Crusher
B: Defective concrete pile C: Auger drive device
D: Pile driver body 5 Patent applicant: Nippon Concrete Industry Co., Ltd. Yari 3Wi

Claims (1)

[Claims] 1. A special ready-made concrete pile crusher consisting of a stirring rod and a crusher tip at its lower end is operated by an ordinary pile driver via an auger drive to remove hollows of defective piles. The pile body is crushed and the fragments are stirred while guided by the center, and after advancing to the tip of the pile, the crusher is used as is or while cement milk is injected from the tip, it is pulled up and the wrapped reinforcing bars etc. are removed by gas cutting. This is a ready-made concrete pile crushing method that is characterized by: 2.Equipped with a stirring rod having an appropriate number of stages of stirring blades at the top and a crusher tip consisting of a pile body crushing pawl and a pile hollow entry guide at the bottom, operated by a normal pile driver,
A ready-made concrete pile crushing device characterized in that a defective pile is crushed by a pile body crushing pawl while the center is held by a pile hollow entry guide, and the fragments are stirred by a stirring blade.