JP2001219092A - Method for crushing concrete structure using expandable material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for crushing a concrete structure of using an expandable material capable of improving the efficiency of crushing work. SOLUTION: A tubular member 12 having prescribed strength is previously embedded in a segment (an opening 11) to be crushed of concrete. When the segment to be crushed is going to be crushed, the expandable material 16 is packed into the tubular member 12 to expand or destroy the tubular member 12 and to generate cracks in the concrete around the tubular member 12 by the expansion of the expandable material 16. Crushing force is applied toward the cracked segments from the front surface side 15 of the concrete by crushing means, by which the concrete is crushed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the use of an expansive material suitable for the case where the whole or a part of concrete is to be crushed in advance at the time of construction, such as dismantling of a temporary structure or forming an opening in a concrete wall. To the crushing method of concrete structures that have been damaged.

[0002]

2. Description of the Related Art Conventionally, when breaking a whole or a part of a massive concrete structure, such as when dismantling a temporary concrete structure or forming an opening in a concrete wall, a mechanical impact is applied to the concrete by a breaker or the like. There have been methods of drilling concrete, drilling holes in concrete, filling the holes with an expansive material to generate cracks, and exploding explosives in concrete.

[0003]

However, any conventional crushing method has a problem that the working efficiency is very poor. That is, since the breaker can only give a local impact to the concrete, the amount that can be crushed at one time is limited, and the work efficiency is poor.

In the method of drilling a hole in a concrete and filling the hole with an intumescent material to generate a crack, since a crack generated from one hole is relatively small, a large number of holes are formed in the concrete. Therefore, the work efficiency was poor.

Furthermore, in the method of explosive explosives in concrete, holes for packing explosives in the concrete must be provided, and the number of holes must be reduced so as not to crush more than necessary. In addition, the arrangement, the amount of explosives to be charged, and the like must be finely controlled, which is troublesome and inefficient in work efficiency.

Accordingly, an object of the present invention is to provide a method of crushing a concrete structure using an expandable material capable of improving the efficiency of crushing work.

[0007]

SUMMARY OF THE INVENTION The present invention is a method for crushing a concrete structure, and is constituted as follows in order to solve the above-mentioned technical problem. That is, the present invention is a method for crushing a concrete structure in which a portion to be crushed of concrete is determined in advance, wherein a tubular member having a predetermined strength is previously embedded in the portion to be crushed of the concrete, When crushing a portion to be crushed, the tubular member is filled with an intumescent material, and the expansion of the intumescent material causes the tubular member to expand or break, and the concrete surrounding the tubular member is filled with the tubular member. Generating substantially parallel cracks, crushing the concrete by applying crushing force from the surface side of the concrete toward the portion where the crack has occurred by a crushing means, or peeling off at the portion where the crack has occurred. It is characterized by the following.

The present invention is characterized in that the tubular member is bent and disposed entirely within substantially the same area as the portion to be crushed, and the bent tubular member is buried in a state substantially parallel to the concrete surface. It is characterized by.

[0009] The present invention also relates to a method of embedding a plurality of the bent tubular members in multiple stages in the thickness direction of the concrete,
It is characterized in that a series of operations of filling the expansive material, forming the cracks, and crushing are repeated one by one from the tubular member on the surface side of the concrete.

Next, the configuration of each section will be described. (Concrete structure) It can also be applied to a case where a reinforcing bar is buried in concrete. (Tubular member) To the extent that it withstands the side pressure of concrete acting upon concrete and is broken or expanded by the expansion pressure of the expandable material filled therein, and does not hinder the transmission of the expansion pressure of the expandable material to the concrete. A tubular member having the strength described above and capable of flowing the expandable material over its entire length even when bent is used.

As the tubular member, for example, a cardboard cylindrical sleeve used for forming a round hole for equipment piping in concrete during construction of a concrete form during construction, or a member having a prestressed concrete structure is used as a post. In the case where the tension method is used, a sheath (sheath) that covers the tendon can be used so that the concrete and the tendon do not adhere to each other.

The tubular member can be bent, for example, in a wavy shape, so as to spread the entirety of the portion to be crushed. (Expandable material) For example, a static crushing agent which expands by reacting with water can be used. This static crushing agent reacts when water is added, expands with the passage of time, and develops an expansion pressure sufficient to cause cracks in concrete.

According to the present invention, by appropriately setting the embedding position of the tubular member in the concrete, the thickness of the concrete to be crushed can be easily crushed by cracks generated around the tubular member. It can be divided into various thicknesses.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a concrete structure crushing method using an expansive material according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, in which an opening 1 is formed in a concrete wall 10 of a concrete structure.
FIG. 4 is a cross-sectional view illustrating a case of forming No. 1. FIG. 1 shows only the concrete wall 10.

This crushing method can be performed, for example, when it is determined that an opening 11 is to be formed in the concrete wall 10 as a portion to be crushed in advance. In this case, at the time of placing the concrete in the concrete wall 10, a tubular member 12 formed of, for example, a cardboard tubular sleeve is embedded as a tubular member having a predetermined strength in a range where the opening 11 is formed.

It is preferable that the tubular member 12 is disposed so as to be entirely widened in a range to be crushed. For this reason, in the present embodiment, the tubular member 12 is bent substantially in a wavy shape and buried slightly inside the range where the opening 11 is to be formed. Both end portions 13 and 14 of the tubular member 12 are bent in a substantially perpendicular direction to a portion which is bent and spread in a wave shape and is extended by a predetermined size. The one end 13 serves as a filling port for the inflatable material 16 as will be described later, and the other end 14 serves as an air vent hole for bleeding the air 17 in the tubular member 12.

The tubular member 12 spread in a plane is shown in FIG.
As shown in FIG. 5, the concrete wall 15 is located at a position away from the concrete surface 15 to which the crushing force is to be applied by an appropriate dimension, that is, the concrete thickness between the concrete surface 15 and the tubular member 12 is a thickness that facilitates crushing. It is buried in such a position as to be substantially parallel to the concrete surface 15.

At this time, a sealing plug (not shown) is attached to the filling port 16 and the air vent hole 17 of the tubular member 12,
Either leave the concrete surface 15 or bury it in a position where it can be immediately exposed.

When the opening 11 is formed by crushing the concrete after the completion of the concrete wall 10, as shown in FIG. 1, the filling port 13 and the air vent hole 14 of the tubular member 12 are opened, and the filling port 13 is opened. Fill the expandable material 16 from 13.

As the expandable material 16, for example, a static crushing agent which expands by reacting with water can be used. This static crushing agent is a powdery mixture of a quicklime-based inflating substance, which undergoes a chemical reaction when water is added, expands, and develops an expanding pressure to the periphery.

[0022] Static crushing agents are used for crushing rocks and concrete. In this case, usually, a hole is drilled in rock or concrete, and a mixture of a static crushing agent and water is poured into the hole, and the mixture is expanded over time to crack the rock or concrete. To be generated.

When the entire tubular member 12 is filled with the expandable material 16, as shown in FIG. 3, the expandable material 16 expands with the passage of time.
Are expanded or destroyed. Then, the surrounding concrete is pressed outward by the expansion pressure F of the expandable material 16.
As a result, cracks 18 occur around the tubular member 12.

At this time, as described above, since the tubular member 12 is bent in a wave shape and spreads in a plane, a large number of cracks 18 generated around each portion of the tubular member 12 as shown in FIG. Are connected to form a cracked surface 19 having substantially the same size as the opening 11. In order to form the cracked surface 19 by connecting the cracks 18, the tubular member 1
It is necessary to appropriately set the interval between the two linear portions.

Thus, the portion of the concrete wall 10 where the opening 11 is to be formed is divided into 22 thin concretes 10a and 10b. Therefore,
On the concrete surface 15, for example, a breaker (not shown)
By applying the crushing force H by a suitable crushing means such as the one shown in FIG. 5, the concrete on the concrete surface 15 side can be easily crushed and removed as shown in FIG.

Thereafter, since the remaining concrete 10b is also thin, the concrete can be easily crushed by applying a crushing force H by a breaker from the cracked surface 19 side or the opposite side. In this manner, as shown in FIG. 6, the opening 11 which has been determined to be formed in the concrete wall 10 in advance can be formed easily and without crushing unnecessary portions.

As described above, according to the present invention, the tubular member 1
2 is filled with the expansive material 16, the thickness of the concrete can be divided into thicknesses that can be easily crushed. By applying a crushing force H to this portion with a breaker or the like, crushing can be easily performed, and work efficiency can be reduced. Can be greatly improved. Moreover,
Only necessary portions can be crushed without crushing unnecessary portions.

In the above embodiment, the tubular member 12 is
Although the case where only the steps are buried has been described, as shown in FIG. 7, when the concrete wall 20 to be crushed has a considerably large thickness, the tubular members 22a to 22n may be buried in a plurality of steps. it can.

Here, the tubular members 22a to 22n are shown in FIG.
These tubular members 22 have the same shape as the tubular members 12.
a to 22n are arranged in multiple stages in a state substantially parallel to the concrete surface 25 at a predetermined interval from each other.

The interval between the tubular members 22a to 22n is
As will be described later, the thickness of concrete between the cracked surfaces 30a, 30b,... Generated by the tubular members 22a to 22n is set so as to be easily broken. This may be, for example, about 20-40 cm, depending on the performance of the breaker and the like. The filling ports 23a to 23n and the air vent holes 24a to 24n of the tubular members 22a to 22n are exposed when the front concrete is crushed and removed.

When the opening 21 is formed by crushing the concrete wall 20, first, the concrete surface 2
The expandable material 26 is filled in the first-stage tubular member 22a located closest to the position 5. At this time,
Air 27 escapes from 4a to 24n. by this,
As shown in FIG. 8, a cracked surface 30a substantially parallel to the concrete surface 25 is generated around the tubular member 22a, and the thickness of the concrete from the concrete surface 25 to the cracked surface 30a is reduced. Therefore, this portion can be easily crushed by a breaker or the like.

Thus, the first-stage tubular member 22a
After crushing and removing the concrete in front of the cracked surface 30a generated around the periphery, the second-stage tubular member 22b is filled with the expansive material 26 to generate the cracked surface 30b, and the front-side concrete is broken into breakers. Crush with.

Hereinafter, in the same procedure as described above, from the third-stage tubular member 22c to the last-stage tubular member 22n, filling of the expansive material 26, formation of the cracked surfaces 33c to 33n, and concrete crushing by the breaker are performed. Work,
By repeating the process one by one from the concrete surface 25 side, the opening 21 can be formed at a predetermined position of the concrete wall 20, as shown in FIG.

In the above-described embodiment, the crushing process is sequentially performed on the plurality of tubular members 22a to 22n one by one. However, the crushing process may be performed simultaneously on all the stages or on a plurality of stages. Further, the present invention relates to the concrete wall 10,
This can be done even when rebar is buried in 20,
Further, the present invention is not limited to the concrete walls 10 and 20,
It is applicable when crushing concrete of various concrete structures.

[0035]

As described above, according to the present invention,
Since the thickness of the concrete to be crushed can be divided into thicknesses that can be easily crushed by cracks, crushing is easy and work efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a method for crushing a concrete structure using an expansive material according to the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a diagram illustrating cracks in concrete caused by an expansive material.

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a diagram illustrating a work procedure of the crushing method of the present invention.

FIG. 6 is a diagram illustrating a work procedure of the crushing method of the present invention.

FIG. 7 is a perspective view illustrating another embodiment of the present invention.

FIG. 8 is a diagram illustrating a work procedure according to another embodiment of the present invention.

FIG. 9 is a diagram illustrating a work procedure according to another embodiment of the present invention.

[Explanation of symbols]

 10,20 Concrete wall 11,21 Opening (part to be crushed) 12,22a-22n Tubular member 16,26 Expandable material 18 Crack 19,30a-30n Cracked surface

Claims (4)

[Claims] 1. A crushing method for a concrete structure in which a portion to be crushed of concrete is determined in advance, wherein a tubular member having a predetermined strength is buried in a portion to be crushed in the concrete in advance, and When crushing a portion to be crushed, the tubular member is filled with an inflatable material, and the inflatable material expands or breaks the tubular member, and the concrete surrounding the tubular member is substantially similar to the tubular member. By generating parallel cracks, crushing the concrete by applying crushing force from the surface side of the concrete toward the cracked portion by crushing means, or peeling off at the cracked portion. A crushing method for concrete structures using a characteristic expansive material. 2. The method according to claim 1, wherein the tubular member is bent and disposed entirely inside the portion to be crushed, and the bent tubular member is embedded in a state substantially parallel to the concrete surface. A method for crushing a concrete structure using the expandable material according to claim 1. 3. A plurality of the bent tubular members are buried in multiple stages in the thickness direction of the concrete, and each of the tubular members on the surface side of the concrete is filled with the expansive material one by one from the tubular member on the surface side of the concrete to reduce the cracks. 3. The method for crushing a concrete structure using an intumescent material according to claim 2, wherein a series of operations of forming and crushing are repeatedly performed. 4. The method for crushing a concrete structure using an expandable material according to claim 2, wherein the tubular member is bent in a substantially wave shape.