JPH11236769A - Breaking method for increase of reinforced concrete building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily expose reinforcements by making a notch in a body without reinforcements along the main reinforcements thereof to separate the body without reinforcements from the main reinforcements part and remove the body and take out the main reinforcements from the main reinforcements part. SOLUTION: When exposing main reinforcements K of an existing structure, a notch 7 is cut along a row of distributing bars 4 and the body 9 without reinforcements separated from main reinforcements part is forced to bend it at the notch 7. The body 9 without reinforcements includes cut stirrups 5 but it does not substantially include any rods. Hence, it can be easily removed. Subsequently, concrete in the arranged part 10 of main reinforcements is broken. When this part 10 is thin, it is crushed by a clamping crusher or the like. When the part 10 is thick, holes H having a specified size are formed at every appropriate pitch and the periphery of the holes is Weakened and crushed by a crusher such as a hydraulic crusher by making use of the holes H. Accordingly, the reinforcements of an increased part in an existing reinforced structure can be simply and efficiently exposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete structure crushing method for adding a new reinforced concrete structure to a reinforced concrete structure such as a subway passage, a building, or the like and adding the reinforced concrete structure.

[0002]

2. Description of the Related Art Subway stations, passageways, train tracks and the like are provided inside a reinforced concrete structure such as a ramen structure. When a part of this type of reinforced concrete structure is expanded, a part of the existing structure is removed and a new structure is added. In the construction of such a reinforced concrete structure, it is necessary to expose the ends of the reinforced structure, which is the framework of the existing structure, to join and integrate the reinforced structure of the newly added portion. In this case, of the existing reinforced concrete structures, a new main reinforcement is joined by exposing a main reinforcement serving as the center of the frame, and a desired reinforced concrete structure is constructed based on the new main reinforcement.

[0003]

In order to join an additional reinforcing bar to an existing reinforcing bar, it is necessary to expose a reinforcing bar (usually only the main reinforcing bar) of an existing structure. The reinforcing bars of the structure are composed of a plurality of relatively thick main bars arranged along the cross section, a large number of force bars arranged in a direction crossing the main bars (generally at right angles), and a plurality of ribs connected to the main bars. Since it has a complicated structure with muscles (some other structures, but all include the main muscle)
It was extremely difficult to crush the concrete cast in this and expose the rebar.

[0004] That is, in the conventional rebar exposing work, concrete around the rebar to be exposed was crushed and removed by a breaker or the like, but this work requires a great deal of labor and is inefficient. In addition, there is a problem that much noise, dust and vibration are generated. The present invention solves the above-mentioned problems of the conventional method, and relatively easily exposes a reinforcing bar (usually only a main bar) necessary for joining an existing structure,
It is an object of the present invention to provide a construction method capable of expanding and renovating a new structure.

[0005]

The crushing method for a reinforced concrete structure according to the present invention is a method for crushing an existing reinforced concrete structure having a main reinforcement portion in which a plurality of main reinforcements are embedded and an abdomen in which the main reinforcements are not embedded. A crushing method for expanding a structure, wherein a cut is made in a reinforced concrete abdomen along a main reinforcement of reinforced concrete in the existing reinforced concrete structure, thereby separating the abdomen from the main reinforcement and removing the abdomen. The main rebar is pulled out from the main rebar, and the reinforcing bar of the additional portion is joined to the main rebar.

According to the present invention having the above structure, a cut is made along the main reinforcement of the existing structure to separate the portion including the main reinforcement (main reinforcement) from the abdomen not including the main reinforcement, and then the concrete portion is crushed. Therefore, the concrete is easily crushed. The muscles and ribs exposed with the main muscles
It can be easily removed by a method such as gas cutting.

[0007] When the abdomen is large, it is preferable to make a plurality of cuts in the abdomen and remove them sequentially. Also, a hole of a predetermined size is drilled at an appropriate interval in the abdomen, and after using the hole to weaken the peripheral portion with a crushing device such as a hydraulic crusher, the reinforcing bar is pulled out with a hanging tool, Easy to crush. And if you use these methods together,
Large reinforced concrete structures can be easily crushed and the reinforcing bars can be pulled out.

When a part of an existing reinforced concrete structure is crushed and a new structure is added to the crushed concrete structure, a main bar having a predetermined length is exposed by the above-described method, and then the frame of the extension portion is formed. The end of the new main bar is joined (usually welded) to the exposed main bar, and a new rebar structure is constructed and hardened with concrete. As a result, a new structure integrated with the existing concrete structure can be obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments of the present invention shown in the drawings.

FIG. 1 is a sectional view showing a construction for widening the width of a passage by breaking a side wall W (a shaded portion in the figure) of a reinforced concrete structure C in which a subway passage is installed. This is a construction to add a new structure N to widen the passage width. In this construction, first, a protection wall G for construction is installed inside the side wall W to be removed (the existing passage side), and the side wall is crushed and removed within a predetermined range.

Next, the concrete of the end of the existing structure C to be left, that is, the connecting portion Ca of the new structure is crushed to expose the reinforcing bars (main bars) K,... By a predetermined length. This rebar exposure method will be described with reference to FIGS.

FIG. 2 shows a reinforced concrete structure 1 having a rigid frame structure, in which a hatched portion 2 is removed. The double-hatched portion 3 represents a lap portion where old and new reinforcing bars overlap. A line S in the figure is a line representing a cut surface obtained by separating the existing structure.

The main bars K,..., Which are the basis of the reinforcing bar structure at the ends where unnecessary portions of the existing structure are cut off, are exposed. The exposed length is the length A of the wrap portion 3 and is usually about several tens cm to one hundred and several tens cm. In this part,
For example, as shown in FIG.
mm) are arranged at predetermined pitches in parallel with each other along the vicinity of the surface of the structure (in a direction perpendicular to the plane of FIG. 2), and the distribution muscles (for example, having a diameter of 1 mm) cross each other.
6mm) 4, ... are arranged in large numbers. Then, the ribs (for example, having a diameter of 10 m)
m) 5,...

In exposing the reinforcing bars, first, as shown in FIG. 3, cuts 7,... Of a predetermined depth are formed along the rows of the distribution bars 4,. The cut 7 is efficiently formed by using, for example, a wall saw or a core boring having a diamond blade. In the case of a wall saw, cutting is performed while moving along the plane of the drawing. However, when the depth of the cut 7 is large, a method of forming the cut 7 by drilling holes h,... Having a predetermined depth as shown in FIG. Adopted. FIG. 4 is a detailed view of the cut 7 as viewed in the direction of the arrow X. The ribs 5,... That bundle the main muscles K,.

Next, the reinforced concrete abdomen 9 separated from the main bar arrangement portion by the cuts 7 is folded with a wedge, an abutment arrow or the like. This portion 9 includes the cut ribs 5,..., But can be easily removed because it is substantially unstrained. In the case where the thickness D of the reinforced concrete structure is large, the number of cuts 7 in this portion 9 may be increased as many as necessary, and the portions 9 may be sequentially removed.

Subsequently, the concrete in the main bar arrangement section 10 is crushed. When the thickness of this portion is small, it can be easily crushed by a known crusher, chipper or the like. When the thickness of the portion 10 is large,
Are formed at appropriate intervals as shown in (1), and a working member (pressure plate in the illustrated example) 21 such as a hydraulic crusher 20 is inserted into the holes to apply a force in the direction of expanding the inner diameter to concrete. It can be easily crushed by weakening. In addition, it can be broken by using the hydraulic crusher and the like together with a crusher, a chipper and the like. FIG. 6 shows an example of the above-mentioned crusher, and FIG. 5 shows an example of a hydraulic crusher. In addition, crushing can also be performed using a so-called rock cutter or the like that pushes and opens a pair of rods (seed arrows) inserted into the holes with a wedge-type wedge that is hydraulically advanced.

According to the above-described method, the main reinforcement at the joint end of the existing structure can be easily exposed. According to this method, it is not necessary to repeatedly apply a large impact, so that noise, dust, vibration and the like are less generated. In addition, since a cut is made along the main bar to separate into blocks having a small thickness and then crushed, crushing can be performed efficiently with a relatively small force. The main bars K,... Provided for joining are hardly damaged.

When a new structure is to be added to an existing structure, the main bars K,... At the joints of the existing structure are exposed, and the main bars which are the basics of the newly constructed reinforcing bars are added to the exposed main bars. Connecting. This connection is performed by a known joining method such as pressure welding or welding. Then, a reinforcing bar structure of a new structure is constructed on the basis of the joined and integrated main reinforcing bars, and concrete is poured into that portion. As a result, an additional reinforced concrete structure integrated with the existing structure can be obtained.

In the above description, the ramen structure of a subway has been described as an example. However, the present method can be applied to the extension of various reinforced concrete structures such as bridge piers, buildings, tunnels, and structures for nuclear reactors. Needless to say.

[0020]

As described above, according to the method of the present invention, it is possible to easily and efficiently expose the reinforcing bars of the existing reinforced concrete structure to the expanded portion. According to this method, it is not necessary to repeatedly apply a large impact, so that noise, dust, vibration and the like are less generated. In addition, since a cut is made along the main bar to separate into blocks having a small thickness and then crushed, crushing can be performed efficiently with a relatively small force. Therefore, it is possible to relatively easily and safely construct a new reinforced concrete structure by adding a new reinforced concrete structure to an existing reinforced concrete structure, and to reduce noise, dust, vibration, and the like. .

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a construction example of the method of the present invention.

FIG. 2 is a schematic explanatory view illustrating a construction procedure.

FIG. 3 is an explanatory diagram of a main part.

FIG. 4 is an explanatory diagram of a cut formed by a continuous hole.

FIG. 5 is a side view illustrating a usage example of the hydraulic crusher.

FIG. 6 is a front view of the pressure crusher.

[Explanation of symbols]

 K Main reinforcement 2 Existing part 3 Extension part 4 Distributor 5 Rib 7 Cut

Claims (3)

[Claims] 1. A crushing method for adding a new structure to an existing reinforced concrete structure having a main reinforcing bar portion in which a plurality of main reinforcing bars are buried and an abdomen in which the main reinforcing bars are not buried, the crushing method comprising: By making a cut in the abdomen of the reinforced concrete along the main bar of the reinforced concrete in the reinforced concrete structure, the abdomen is separated from the main bar portion, the abdomen is removed, the main bar is pulled out from the remaining main bar portion, and the main bar is expanded. A crushing method for adding reinforced concrete structures, characterized by joining reinforcing bars. 2. The crushing method according to claim 1, wherein a plurality of cuts are made in the reinforced concrete abdomen and the abdomen is sequentially removed. 3. A hole of a predetermined size is drilled at an appropriate interval in the abdomen, and the peripheral portion is weakened by a breaking device such as a hydraulic crusher using the hole. A crushing method according to the extension of the reinforced concrete structure according to claim 1 or 2.