JP2003307038A - Demolishing method for concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a demolishing method for a concrete structure capable of very efficiently executing a demolishing work while removing adverse effects to the surroundings. <P>SOLUTION: The internal region of a concrete structure 2 is divided into a plurality of sections A, B, C, D, by broken lines (1), (2), (3) and these sections are demolished by blasting in succession one by one. After columns 12, 38 or partition walls 36, 42, 46, 49 in the inside of the respective sections A, B, C, D have been blasted previously, the outer peripheral walls 40, 43, 47, 50 constituting the peripheries of the sections A, B, C, D are blasted respectively. By such a demolishing procedure, the demolishing work can be rapidly and efficiently promoted, further, since the inside columns 12, 38 and partition walls 36, 42, 46, 49 can be blasted prior to the outer peripheral walls 40, 43, 47, 50, the blasting sound, vibration, blasting wind, dusts, etc., resulting from blasting can be prevented so as not to leak to the outside and hence, adverse effects giving to the surroundings can be prevented. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete structure capable of suppressing the adverse effects of noise, vibration, dust and the like on the surrounding environment and improving the working efficiency. Related to the dismantling method. Conventionally, as a method of dismantling a concrete structure, there is a method of sequentially crushing the structure using a dismantling work device such as a large breaker or a concrete crusher. For large-scale structures with large cross-sectional areas such as nuclear facilities and bridges, first disassemble them as large blocks using a large breaker, and then crush the blocks using a concrete crusher.
A stage system is adopted. However, it is very inefficient and time-consuming to directly dismantle large structures using such dismantling equipment. [0003] However, in the case of the above-mentioned dismantling work apparatus, loud mechanical noise, vibration, dust and the like are generated, and there is a concern that the surrounding area may be adversely affected. In addition, for large-scale structures with large cross-sectional areas, although a two-stage method using a large breaker and a concrete crusher is adopted as described above, when the amount of reinforcing steel is extremely large and the scale is large,
There was a problem that the dismantling work did not proceed. Particularly in a nuclear power plant, the internal structure is made extremely rugged, so that it takes a very long time to disassemble it, and there is a fear that the cost will increase. On the other hand, as a method of dismantling a structure, there has been conventionally known a method of dismantling by explosion using an explosive without using the above-described dismantling work device. The method of dismantling by blasting has the advantages that even a large-scale structure can be dismantled in a very short time, and that the structure can be crushed into pieces by a method of setting explosives. However, since the entire structure is dismantled by a single blast, there is a problem in that loud explosions, vibrations, and blasts are generated, and at the same time, dust and debris are scattered. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a concrete structure capable of performing demolition work very efficiently while eliminating adverse effects on the surroundings. To provide a dismantling method. [0006] In order to achieve the above object, in the method of dismantling a concrete structure according to the present invention, a concrete wall defined inside a concrete structure is provided. Dividing the inside area of the concrete structure into a plurality of sections with the enclosed area as a section unit,
Each section is dismantled by blasting sequentially, and when disassembling each section, after first blasting structural parts such as pillars and walls inside each section, forming the outer periphery of the section. Blasting other walls of the concrete wall other than the walls constituting the outer periphery of the undismantled section (claim 1). In this dismantling method, the inside of a concrete structure is divided into a plurality of sections and each section is sequentially dismantled by blasting. Therefore, even a large-scale structure having a large cross section is crushed by concrete. Since the post-processing can be performed only by the machine, disassembly becomes easier and the time required for disassembly is shortened as compared with the case where a dismantling device such as a conventional large breaker is used. Also, defined inside the concrete structure,
The area surrounded by concrete walls is divided into sections, and when dismantling each section, the pillars and partition walls inside each section are blasted first, and the walls constituting the outer periphery of each section are blasted later. Therefore, it is possible to prevent the explosion sound, blast, dust and the like caused by the blast from leaking too much, and it is possible to suppress the adverse effects on the surroundings as much as possible. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a concrete structure dismantling method according to the present invention will be described below with reference to the accompanying drawings. 1 to 6 show an embodiment of a concrete structure dismantling method of the present invention. FIG.
Is a plan view showing the internal structure of the concrete structure to be dismantled, FIG. 2 is a cross-sectional view showing the internal structure of the concrete structure, and FIG. 3 is a diagram showing a method of installing explosives. is there. 4 to 6 are views showing a procedure for dismantling a concrete structure. The structure 2 to be dismantled is shown in FIGS.
As shown in FIG. 1, the structure has a ground floor 4 and a basement floor 6 extending over a plurality of floors 8 and 10, respectively, and is constructed of a reinforced concrete structure, a reinforced steel frame concrete structure, or the like. Inside this structure 2, as shown in FIG.
The large space portions 13 and 14 and the middle space portion 15 in which only the pillar portion 12 is present and the inside of which is not partitioned by the wall portion, and the small space portion 16 without the pillar portion 12 therein are defined. Further, in the present embodiment, as constructed in a nuclear power generation facility,
Thick concrete wall 17 and concrete floor 1
A very rugged space 19 surrounded by 8,
A space portion 20 without a pillar portion is defined inside. In disassembling the structure 2, in the present embodiment, an area inside the structure 2 is divided into a plurality of sections. This division is for sequentially dismantling the structure 2 by blasting for each section, and each section is set so that the demolition work can be smoothly performed.
In the present embodiment, the partitioning is performed such that each partition is a region whose outer periphery is surrounded by a concrete wall. The reason why the area surrounded by the concrete wall is set as one section is that when the section is dismantled, the surrounding area is so badly affected by blasting noise, vibration, dust, blast and the like. In order not to give them. In other words, in the state where the outer periphery of the section is surrounded by the concrete wall section, by blasting the structural section such as the pillar section and the wall section inside the section in advance, the surrounding is covered by the concrete wall section at the time of the blast, The explosion noise, vibration, dust, and blast associated with the blast do not leak out much. Then, by blasting the concrete wall portion, the demolition work can be performed very efficiently without much adverse effect on the surroundings. In the present embodiment, in the plane cross section of the structure 2, the four sections A, B, C, and D are divided by broken lines as shown in FIG.
In the vertical cross section of FIG.
,,, The ground floor 4 and the basement floor 6 are classified into the respective layers 8, 10. Then, the disassembly order of the sections A, B, C, and D is determined, and the sections A, B, C, and D are sequentially dismantled by blasting according to the order. The explosive is supplied to the columns 12, 38 and the partition walls 36, 42, 46, 4, 4 inside the large cross section which cannot be directly crushed by the concrete crushers in the sections A, B, C, D.
9, outer peripheral wall portion 4 surrounding the outer periphery of each section A, B, C, D
0, 43, 47, 50 and the ceiling floor (not shown) of each of the sections A, B, C, D, and the like. FIG. 3 shows an example in which an explosive is set. As shown in FIG. 3A, holes 28 are provided at a plurality of locations in the wall 22, the pillars 24, the ceiling floor 26, and the like at appropriate intervals along the height direction or the lateral direction. Each of the holes 28 is provided with an explosive 30. Thereby, the wall part 22, the pillar part 24, the ceiling floor part 2
Cracks can be evenly generated in 6 and can be smoothly dismantled using a concrete crusher. Here, as for the wall portion 22 and the pillar portion 24 constituting the outer periphery of the section 32 and the ceiling floor section 26 of the section, the hole 28 is formed from the inside of the section 32 to 1 / th of its sectional thickness. It is provided at a depth of about 2/3. This is to prevent explosions, vibrations, dust, and the like accompanying the blast from leaking to the outside when the outer peripheral wall portion 22 and the ceiling floor portion 26 of the section 32 are blasted. Part 2
4. Crush the inside of the ceiling floor 26 so as to collapse from the inside. When charging the explosive 30 into the ceiling floor 26, a hole 28 is provided so as to penetrate the ceiling floor 26, as shown in FIG. The explosive 30 is loaded from above, and the upper opening of the hole 28 may be closed with a suitable plug 34. Thus, the work of installing the explosive 30 on the ceiling floor 26 can be performed from the floor on the upper floor, so that it is very simple and the work time can be shortened. Next, a procedure for dismantling the structure according to the present embodiment will be described. 4 to 6 show a dismantling procedure of the structure. First, the explosive set on the partition wall portion 36 and the column portion 38 (see FIG. 1) inside the section A is ignited,
As shown in FIG. 4 (a), the portion 3 is left with the outer peripheral wall portion 40 and the ceiling floor portion (not shown) constituting the outer periphery of the section A left.
Bombs 6 and 38 are dismantled first. Next, the explosive set on the ceiling floor is ignited. Then, the explosive set on the outer peripheral wall 40 is ignited. Thus, the partition wall portion 36 and the column portion 38 inside the section A are blasted first,
After that, by exploding the ceiling floor portion and the outer peripheral wall portion 40 of the section A, it is possible to prevent explosions, vibrations, blasts, dusts and the like accompanying the blast from leaking to the outside as much as possible. Thereby, as shown in FIG. 4B, the dismantling work of the section A is completed. The walls 43 and 47 constituting the outer peripheries of the sections B and C, which are undismantled sections, are left as they are without being blown up. Next, the section B is dismantled. In the section B, as in the case of the section A, the explosive set on the pillars 12 and 38 and the partition wall 42 inside the section B is ignited, and FIG.
As shown in FIG. 5, after the relevant parts 12 and 42 are blasted and dismantled in advance, the outer peripheral wall 43 and the ceiling floor (not shown) constituting the outer periphery of the section B are blasted, and as shown in FIG. Section B is dismantled as shown. Note that the walls 47 and 50 that constitute the outer peripheries of the sections C and D, which are undismantled sections, are left without being blown up. Next, as shown in FIG. 5 (e), similarly, as shown in FIG. 5 (e), the columns 12, 38 and the partition wall 46 inside the section C are blasted first, and then FIG. As shown in (b), the outer peripheral wall 47 and the ceiling floor (not shown) of the section B are blasted to complete the disassembly of the section C. In addition, the wall part 50 which comprises the outer periphery of the section D which becomes an undismantled section is left as it is without blasting. Similarly, for the section D, as shown in FIG. 6 (g), the pillars 12, 38 and the partition wall 49 inside the section D.
, And then the outer peripheral wall 50 and the ceiling floor (not shown) of the section D are blasted to complete the disassembly of the section D. According to the above procedure, the demolition work is performed by sequentially blasting each section so as to prevent explosions, vibrations, blasts, dusts and the like caused by the blast from having a bad influence on the surroundings. can do. The concrete mass and crushed pieces generated by the dismantling are further divided into smaller pieces by a concrete crusher or the like, and then disposed of after being subjected to a separation process or the like. The floors 8 and 10 of the structure 2 are dismantled by blasting from the upper floor to the lower floor for each of the floors 8 and 10. As a result, the entire structure is sequentially dismantled. Further, when an opening such as a door or a window is formed in a wall constituting the outer periphery of the section, it is preferable to close the opening by pouring concrete into the opening upon blasting. good. Further, at the time of the blast, as shown in FIG. 7, the main reinforcements 56, 5 and 5 embedded in the outer peripheral wall 54 of the section 52 are provided.
It is preferable that a portion corresponding to the root portion of the outer peripheral wall of the section 52 (the position indicated by the symbol △ in the figure) is cut by a concrete cutter or the like with respect to the main reinforcement 56 disposed outside of the section 7. Further, of the main reinforcing bars 59, 60 buried in the ceiling floor 58 above the section 52, a portion corresponding to the outer edge of the section 52 is also located at the portion corresponding to the outer edge of the section 52 (▲ in the figure).
(The position of the mark) is preferably cut with a concrete cutter or the like. If the main reinforcements 56 and 59 are cut in this way, when dismantled by blasting, the blasted floor material hangs down to a low position as shown by the broken line in FIG. Will be able to do it. In the dismantling method described above, since each section inside the structure 2 is sequentially dismantled by blasting, the work becomes very easy and the work time required for dismantling is reduced. Moreover, here, the area surrounded by concrete walls defined inside the concrete structure is taken as a unit of division, and at the time of dismantling each section, the pillars and partition walls inside each section are blown up first, The walls that make up the outer perimeter of each section will be blasted later, so it is possible to prevent the explosion noise, blast, dust, etc. from leaking too much, thereby minimizing adverse effects on the surroundings. can do. According to the concrete structure dismantling method according to the present invention, the inside of the concrete structure is divided into a plurality of sections, and each section is sequentially dismantled by blasting. Disassembly becomes easier and the time required for disassembly is shortened as compared with the case where a disassembly device such as a large breaker is used. In addition, the area surrounded by concrete walls defined inside the concrete structure is divided into sections, and when dismantling each section, the pillars and partition walls inside each section are blown up first, The walls that make up the outer perimeter of each section will be blasted later, so it is possible to prevent the explosion noise, blast, dust, etc. from leaking too much, thereby minimizing adverse effects on the surroundings. (Claim 1).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan sectional view showing the inside of a concrete structure to be demolished in one embodiment of the concrete structure demolition method according to the present invention. FIG. 2 is a longitudinal sectional view showing the inside of the concrete structure to be demolished in one embodiment of the concrete structure demolition method according to the present invention. FIG. 3 is an explanatory diagram showing how to set explosives in one embodiment of the concrete structure dismantling method according to the present invention. FIG. 4 is an explanatory diagram showing a demolition procedure in one embodiment of the demolition method of a concrete structure according to the present invention. FIG. 5 is an explanatory diagram showing a demolition procedure in one embodiment of the demolition method of a concrete structure according to the present invention. FIG. 6 is an explanatory view showing a demolition procedure in one embodiment of the demolition method of a concrete structure according to the present invention. FIG. 7 is an explanatory diagram showing an embodiment in which the outer peripheral wall portion and the ceiling floor portion of the section are dismantled in the concrete structure dismantling method according to the present invention. [Description of Signs] 2 Structure 4 Ground floor 6 Basement floor 8, 10 Floors 12, 38 Columns 36, 42, 46, 49 Partition walls 40, 43, 47, 50 Peripheral wall 54 Peripheral wall 58 Ceiling floor Sections 56, 57, 59, 60 Main bars A, B, C, D Section

Claims (1)

Claims: 1. A method for dismantling a concrete structure, comprising: an inner area defined by an area surrounded by a concrete wall defined inside the concrete structure as a unit of division. Is divided into a plurality of sections, and each of the sections is sequentially dismantled by blasting, and when disassembling each of the sections, after blasting a structural portion such as a column or a wall inside each of the sections in advance. A method for demolition of a concrete structure, comprising blasting other walls of the concrete wall constituting the outer periphery of the section except for the wall constituting the outer periphery of the undismantled section.