JPH062330A - Pile cement extracting tool - Google Patents

Abstract

PURPOSE:To make it possible to use a pile cement extracting tool for a cement milk method and to execute work efficiently for the pile cement extracting tool for opening a post erecting longitudinal hole in the upper part of a concrete pile buried into the ground as foundation of a structure. CONSTITUTION:A pair of reinforced frames 1 and 1 formed of metal flat bars bent in an inverted U-shape are so arranged symmetrical positions on an upper edge of a paper cylinder 3 that they straddle and outside of the paper cylinder 3 of cardboard. A stop plate 2 formed of a metal flat is fixed on a bending section of the upper edge of the reinforced frames 1 and 1 by welding, and the peripheral surface of the paper cylinder 3 is covered with an aerated plastic film 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for extracting cement in a pile for forming a vertical hole for establishing a pillar in an upper portion of a concrete pile buried in the ground as a foundation of a building.

[0002]

2. Description of the Related Art A cylindrical paper cylinder is fixedly attached to an upper part of a hollow concrete pile, and the concrete pile is rotated and buried in the ground. After hardening of the cement, the paper cylinder is lifted by a digging heavy machine. It has been conventionally known that a vertical hole for establishing columns is formed in the upper part of the concrete pile by removing the vertical hole from the inside of the concrete pile.

However, the conventionally used cylindrical paper cylinders may be torn off due to a large frictional force acting on the boundary with the hardened cement during pulling up. Note that the outer surface of the paper cylinder was treated by applying a release agent to prevent it from adhering to the cement, but the above-mentioned problems still exist, and once such a problem occurs, the paper cylinder should be removed. There was a drawback that the process for extracting was rather labor intensive.

Therefore, the present invention was first applied for a utility model registration application (Actual Application No. 3-16664) and a patent application (Patent Application No. 4-84).
480) The device for extracting cement in a pile, which is obtained by wrapping the outer peripheral surface of a paper cylinder with a bubble-containing plastic film, does not deform the paper cylinder because expansion of cement during curing is absorbed by the plastic film, and when the paper cylinder is pulled up. The plastic film is peeled off so that it can be flipped inward from the lower edge so that it can be easily pulled out.

[0005]

By the way, the cement extracting device for piles according to the above-mentioned application was developed for use in the rotary burying method in which concrete is gently pushed into the ground while rotating. Therefore, the upper end of the reinforcing frame for protecting the paper tube is attached in a protruding state from the upper end surface of the concrete pile. However, when the cement extraction method in the pile is used in the conventional cement milk method (press-fitting method) in which the upper end surface of the concrete pile is struck by the hammer of the pile driver to embed the pile in the ground, the protrusion of the reinforcing frame Since a stopper or the like for protecting the portion or the protruding portion is sandwiched by the hammer and destroyed, the above-mentioned cement extracting tool in the pile is not suitable for a hammer hit type so-called cement milk method.

[0006]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and a pair of reinforcing frames formed by bending a metal flat bar in an inverted U shape are provided inside and outside a cardboard paper tube. Arranged in a symmetrical position on the upper edge of the paper tube so as to straddle,
A stop plate made of a metal flat bar is horizontally fixed by welding on the upper edge bent portion of the reinforcing frame, and the outer peripheral surface of the paper cylinder is wrapped with a bubble-containing plastic film. is there. Further, the present invention is characterized in that, in the above-mentioned pile cement removing tool, a block formed of an easily deformable material such as sponge or styrofoam is fixed to the lower surface of the stop plate.

[0007]

Operation: By mounting a stop plate composed of a flat bar horizontally fixed by welding on the upper end surface of the concrete pile, even if it is hit with a hammer, there is no risk of damage and it can be attached. Further, by fixing the block to the lower surface of the stop plate, it is possible to easily form the through hole of the rope for pulling out in the stop plate only by shrinking the block after hardening the cement or breaking the shape. Like

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numerals 1 and 1 denote a pair of reinforcing frames formed by bending an iron flat bar having a width of several centimeters and a thickness of several millimeters into an inverted U shape, and the upper ends of the reinforcing frames 1 and 1 are bent. Part 1a
A stop plate 2 also made of an iron flat bar is horizontally fixed to the upper part by welding, and the reinforcing frames 1 and 1 are connected to each other. It should be noted that the reinforcing frames 1 and 1 are provided with burrow holes for bolts and screws to be described later.

Reference numeral 3 denotes a paper cylinder made of thick paper having a thickness of about 3 to 5 mm. The reinforcing frames 1, 1 are arranged so as to extend inside and outside the paper cylinder 3.
Over the upper edge of the paper cylinder 3, and a wood screw-shaped screw 4 having a sharp tip is screwed into the paper cylinder 3 from the outside of the reinforcement frames 1 and 1 for temporary fixing, and then the reinforcement frame A through hole is opened in the paper tube 3 by passing a drill through a stupid hole previously formed in the cylinders 1, 1, and a cylindrical spacer 5 is interposed between the inner surface of the paper cylinder 3 and the reinforcing frames 1, 1 to attach the bolt 6 The reinforcing frames 1, 1 are fixed to the paper tube 3 by penetrating the through hole and the spacer 5 and tightening a nut 7 on the bolt 6 inside.

Reference numeral 8 denotes a partition ring which is fixed in advance to the lower ends of the reinforcing frames 1 and 1 by welding so as to connect the reinforcing frames 1 and 1, and the partition ring 8 connects the reinforcing frames 1 and 1 to the paper tube 3 When it is fixed on the paper cylinder 3, it is horizontally arranged in the lower part of the paper tube 3.

As shown in FIG. 4, a plurality of sealed air chambers 9 are provided between two plastic films (polyethylene, nylon, etc.) by heat-sealing them by inserting air between them. It is a well-known aerated plastic film that is commercially available as a cushioning material for packaging formed.

The plastic film 9 is attached to the paper tube 3
The outer peripheral surface of the paper tube 3 is wrapped around the outer peripheral surface of the tape 1 to several times, and both ends of the plastic film 9 are fixed by the gum tape 11. Then, a vertical cut is made in the lower edge of the plastic film 9 to form a strip shape, which is folded back into the opening of the lower end of the paper tube 3 and the folded portion 12 is hit with a hook 13 by a tool such as a tacker. 1
2 is fixed to the inner surface of the engagement hole 2.

The reference numeral 10 is formed of a material such as sponge or styrofoam that is easily broken, and a gum tape 15 is formed on the lower surface of the stop plate 2.
It is a block that is fixed by.

As shown in FIG. 5, the device for extracting cement in a pile constructed as described above is inserted into the upper part of a hollow concrete pile 14 and the stop plate 2 is attached to the concrete pile 1.
Mount on the top surface of No. 4. Then, the hammer of a pile driver (not shown) is dropped to strike the upper end surface of the concrete pile 14 through the stop plate 2 to drive it into the ground as shown in FIG. At this time, the uncured cement filling the ground rises in the hollow holes of the concrete pile 14 and fills the pile and the paper tube 3. Therefore, after the cement is cured and hardened, the block 10 is deformed to form a hole 17 for rope passage under the stop plate 2, and a rope 18 is passed through the hole 17 to lift the stop plate 2. Then, the cement in the paper cylinder 3 can be detached at the lower end of the partition ring 8 and pulled up from the concrete pile 14.

At this time, the plastic film 9 fixed by the hook needle 13 is peeled off from the cement so that it can be flipped up inward as shown in FIG. it can.

Since the plastic film 9 can absorb the expansion of the cement at the time of curing the cement due to the contraction of the air bubbles, it is possible to prevent the paper cylinder 3 from being deformed by applying an excessive pressure to it. Even when the paper tube 3 is pulled up, its frictional resistance is reduced so that the paper tube 3 can be pulled up smoothly. And by this, concrete pile 1
Vertical holes 16 can be formed in

Since the outer diameter can be freely adjusted by changing the number of windings of the plastic film 9, vertical holes having an arbitrary diameter can be formed in the concrete pile 14.

As described above, the inverted U-shaped reinforcing frames 1 and 1 sandwich the paper cylinder 3 from both inside and outside, and the bolts 6 are penetrated to fix the reinforcing frames 1 and 1 to the paper cylinder 3.
Even if the engaging hole 2 absorbs water and loses its strength, the paper tube 3 can be reliably removed by pulling up the reinforcing frames 1 and 1 without coming off.

In this embodiment, the spacer 5 is interposed to separate the inner surface of the paper tube 3 from the reinforcing frames 1 and 1, but the reinforcing frames 1 and 1 are bent into a hairpin shape so as to be in close contact with each other and the spacer 5 is eliminated. May be.

Another embodiment of the present invention shown in FIG. 8 is a stop plate bisected on the upper end bent portion 1a of the reinforcing frames 1 and 1 according to the shape of the impact surface of the hammer of the pile driver to be used. 2a, 2b
Are fixed horizontally by welding, and when a space for loosely fitting the hammer of the pile driver is required between the stop plates 2a and 2b, the stop plate 2 may be divided into two.

[0021]

As described above, the device for extracting cement in a pile according to the present invention comprises a stop plate made of a flat bar which is fixed to the upper end bent portion of the reinforcing frame by welding, and the stop plate is attached to the upper end surface of the concrete pile. By mounting on the pile, the cement extracting tool in the pile can be supported in the concrete pile. Therefore, the hammer can strike the upper end surface of the concrete pile through the stop plate, and the striking force of the hammer does not substantially deform the stop plate or the reinforcing frame made of the metal flat bar, and the striking force of the hammer remains unchanged. It can be transferred to a concrete pile and can be used not only in the conventional rotary burying method but also in the cement milk method of driving type.

Further, by attaching a block which is easily deformable to the lower surface of the stop plate and deforming it after the cement is hardened, the rope for lifting can be easily passed through, and it can be pulled out. There are beneficial effects such as making the work easier.

[Brief description of drawings]

FIG. 1 is a perspective view of a reinforcing frame showing an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the pile cement removing tool according to the embodiment of the present invention.

FIG. 3 is a vertical sectional view of the above.

FIG. 4 is an enlarged sectional perspective view of a bubble-containing plastic film.

FIG. 5 is a usage state diagram.

FIG. 6 is a usage state diagram.

FIG. 7 is a usage state diagram.

FIG. 8 is a perspective view showing another embodiment of the in-pile cement extraction tool according to the present invention.

[Explanation of symbols]

 1 Reinforcement frame 2 Stop plate 3 Paper cylinder 6 Bolt 7 Nut 8 Partition ring 9 Air-filled plastic film 10 Block 12 Folding part 13 Hook needle 14 Concrete pile

Claims (2)

[Claims] 1. A pair of reinforcing frames formed by bending a metal flat bar in an inverted U shape are arranged at symmetrical positions on the upper edge of the cardboard so as to straddle the inside and outside of the cardboard. In addition, a stop plate made of a metal flat bar is horizontally fixed by welding on the upper edge bent portion of the reinforcing frame, and the outer peripheral surface of the paper cylinder is wrapped with a bubble-containing plastic film. A tool for extracting cement from piles. 2. The pile cement removing tool according to claim 1, wherein a block formed of an easily deformable material such as sponge or styrofoam is fixed to the lower surface of the stop plate.