JPS61176716A - Concrete breaker - Google Patents

Abstract

PURPOSE:To prevent the occurrence of noise and vibration as well as secure the safety of operations by a method in which an expandible part attached with a blade is expanded or contracted in concrete by application of pressures. CONSTITUTION:An expandible part 4 with a superhard blade 5 is attached to reinforcing bars 3, and ready-mixed concrete is placed to form a foundation pile 2. A pressing machine 7 is operated to supply a pressure fluid through a hose 6 into the concrete, whereupon the part 4 is expanded and the blade 5 is cut into the concrete to break the concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to construction work in which when a hole is drilled into the ground and ready-mixed concrete is placed to construct a foundation pile, surrounding earth and sand etc. are mixed in and the strength is reduced. This invention relates to a concrete crushing device used to remove hardened concrete from pile heads that have deteriorated.

Conventional technology In the past, when constructing foundation piles in construction work, in order to remove the hardened concrete at the head of the pile whose strength has decreased due to the mixing of surrounding earth and sand, it is necessary to remove the hardened concrete from the head of the foundation pile. The hardened concrete is separated from the reinforcing steel by crushing it with a jackhammer or by inserting a foam tube before pouring fresh concrete into the reinforcing steel that is about 1 m long from the head of the foundation pile to be removed. Then, a wedge is driven into the bottom of the removed part to create a crack, and the removed part is lifted up with a crane and removed, or a special lime-based inorganic compound is applied to the removed part of the foundation pile before pouring ready-mixed concrete. The expansion pressure (several hundred centimeters / cd) generated by the temperature rise due to hydration during concrete hardening is charged.

), the heads of foundation piles were removed.

Problems that the invention aims to solve: When the head of a hardened concrete foundation pile is crushed and removed using a rock jack, it is accompanied by noise and powder scattering, and the vibration of the rock jack has a negative impact on workers. At the same time, the working environment is also poor, and if a foam tube is inserted into the head of the foundation pile and the part to be removed is lifted up with a crane, the part to be removed cannot be lifted up with a crane unless all the reinforcing bars are straight. , which, like the former, requires the use of a jackhammer.

In addition, devices that utilize the expansion pressure generated by the temperature rise due to hydration during concrete hardening are disposable after each use, so the equipment cost is relatively high and the temperature is 0.
There is a drawback that it cannot be used unless the temperature is in the range of ℃ to 40℃.

The present invention eliminates these drawbacks of the prior art, and
There is no noise, no dust, no vibration, and the working environment is good. Even if the reinforcing bars at the foundation pile head are bent, they can be crushed. The object of the present invention is to provide a new concrete crushing device that can be used even when the temperature is outside the range of 0°C to 40°C.

Means for Solving the Problems The present invention is a concrete crushing device, and is characterized in that it expands and contracts the expansion material by applying pressure to the expansion material equipped with a blade.

Function The present invention has taken the above-mentioned measures, so if ready-mixed concrete is poured by inserting or attaching it to the reinforcing bars at the head of the foundation pile, and the expansion material is pressurized after it has completely hardened or when it is not completely hardened, it will expand. The blade attached to the material digs into the concrete, eventually causing cracks in the concrete and eventually causing it to shatter.

Embodiments Hereinafter, a more detailed explanation will be given based on embodiments shown in the drawings.

What is shown in FIGS. 1 and 2 is a first embodiment,
It consists of the following items.

(a) A hose 6 is connected to the other end of the expansion member 4 with one end of an elastic body such as a rubber tube closed, and the hose 6 is connected to a pressurizer 7.

(b) A super-hard blade 5 is attached to the expansion member 4.

(c) Insert or attach the expansion material 4 to the reinforcing bar 3.

(d) Attach the expansion material 4 to the reinforcing bars 3 and pour ready-mixed concrete.

Note that a thin wall portion is provided in the thick wall portion of the expansion member 4, and the blade 5 is attached to the thin wall portion.
may be attached.

When this embodiment is attached to the head of a foundation pile, fresh concrete is cast, and pressure is applied with a pressurizer 7 after it is completely cured or when it is not completely cured, the expansion material 4 is expanded by the elastic material. .

When the internal pressure is increased, the blade 5 attached to the expansion member 4 bites into the concrete, eventually causing cracks in the concrete.

When increasing and decreasing the internal pressure is repeated alternately, incompletely hardened concrete will be crushed in a short period of time, and fully hardened concrete will be crushed in a longer period of time.

When internal pressure is applied to the expansion material 4, only the thin walled portion expands quickly, so the directionality of cracks in the concrete can be accurately determined.

What is shown in FIG. 3 is a second embodiment, in which a plurality of annular expansion members 4 made of an elastic material with blades 5 attached to the outer periphery are arranged in series, and a bolt (rod) 8 is inserted into the center of the annular expansion members 4. A nut 9 is fitted to one end.

When the nut 9 is not tightened, the outer diameter is as shown in Figure A, but when the nut 9 is tightened, the outer diameter expands as shown by B in the figure, and the blade 5 attached to the outer periphery bites into the concrete. The same effects as in the example can be obtained.

In addition, in these embodiments, concrete etc. can be crushed and removed by drilling a hole with a drilling machine, inserting the expansion material 4 into the hole and pressurizing it, so it is possible to demolish and remove dilapidated buildings. It can also be used for excavating bedrock, removing underwater structures, etc.

effect The present invention has the following remarkable effects.

(b) There is no noise, dust scattering, or vibration, so the working environment is good and workers are safe.

(b) Hardened concrete can be crushed even if the reinforcing bars at the head of the foundation pile are bent.

(c) - It is not disposable every time, but can be used repeatedly many times.

(d) It can be used even when the temperature is outside the range of θ°C to 40°C.

(e) Able to work underwater and underwater.

(f) Total cost is lower than conventional technology.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a longitudinal cross-sectional view of a second embodiment of the present invention. . 1. Ground 2. Concrete foundation pile 3. Rebar 4. Expansion material 5. Blade 6. Hose 7. Pressurizer 8. Bolt 9. Nando.

Claims (1)

[Claims] 1. Expanding the expansion material by applying pressure to the expansion material equipped with the blade part,
Concrete crushing equipment characterized by shrinkage. 2. The concrete crushing device according to claim 1, wherein the expansion material expands and contracts by internal pressurization of gas or liquid. 3. The concrete crushing device according to claim 1, wherein the expansion material expands its outer diameter by applying pressure in the thickness direction.