JPH11222812A - Changing method of height of structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change the height of a structure by demolishing an easily breakable part of the vertical concrete part of the structure and vertically connecting the reinforcing members in the inside of the concrete body and placing concrete in the periphery of the connection part of the reinforcing members. SOLUTION: An easily breakable part 2 constituted of low strength concrete is formed at a part of a vertical concrete member 1 such as a column of an elevated bridge, a pier of a bridge, or a column of a concrete building. When changing the height of a structure, after the structure upper than the easily breakable part 2 has been temporarily supported by a lifter 4, the low strength concrete of the easily breakable part 2 is chipped off and the height of structure is changed by extension or contraction of the lifter 4. Further, when the structure is raised up, additional reinforcing members are added and the upper and lower reinforcing members are integrally unified and then, the connection part of the reinforcing members are surrounded by forms to place aditional concrete in the forms. In this way, the height of a structure can be easily changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for changing the height of a structure.

[0002]

2. Description of the Related Art For example, when a railway is elevated, there is a demand that a vehicle be passed at a certain height for a period of time, and that the height be changed as the construction of related facilities progresses thereafter. In order to change the height of such existing structures,
Conventionally, a temporary structure has been constructed and used, and at the time of change, a method has been adopted in which the temporary structure is completely removed and a new structure is constructed in its place.

[0003]

The above-mentioned method is a method of constructing a completely different structure before and after changing the height. Therefore, construction of a temporary structure and subsequent removal work are required, which significantly increases construction costs. Furthermore, even in the case of a temporary structure, even if the actual use period is short, simply constructing the temporary structure requires a long construction period, which is uneconomical. The above problems are
Similar problems were encountered not only with temporary construction of railway viaducts, but also with general civil engineering and reinforced concrete structures in buildings.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and a structure can be constructed at a certain height for a while, and then the height can be easily changed. It is an object of the present invention to provide a method for changing the height of a structure.

[0005]

In order to achieve the above object, a method of changing the height of a structure according to the present invention comprises a portion which is easily broken in a concrete vertical portion of the structure. At the time of changing the height, disassemble the easily breakable part, change the height of the structure above the easily breakable part, connect the reinforcement inside the concrete up and down, and then around the reinforcement joint It features a method of changing the height of a structure by casting concrete.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for changing the height of a structure according to the present invention will be described below with reference to the drawings.

<A> Structure of the structure. The structure used in the height changing method of the present invention adopts a special configuration in advance. That is, in the structure of the present invention, a vertical portion 1 made of concrete of the structure, for example, a pillar portion of a viaduct, a pier of a bridge, or a part of a pillar, a wall, etc. of a concrete building is planned for a future height change. And easily breakable part 2
Is configured. All parts other than the vertical part 1 can be used for structures made of concrete, or the other parts can be used for structures made of steel or the like.

<B> Configuration of the breakable portion. The easily breakable portion 2 is made of, for example, low-strength concrete. When the reinforcing material inside the easily breakable portion 2 is a reinforcing bar, the reinforcing bar at that portion is formed by a lap joint. Alternatively, as shown in FIG. 13, as the easily breakable portion 2, the edge cutting members 9 are horizontally arranged at two upper and lower portions, and concrete equivalent to the other position of the vertical portion 1 is poured between them. As a trimming member for trimming the vertical portion 1, a member obtained by applying a release agent to a steel plate, paper, a synthetic resin plate, a sheet, or the like can be used. Since the holes other than the steel plate are easily drilled, they can be opened in accordance with the position of the reinforcing bar group to form a horizontal marginal cross section. In the case of a steel plate, the opening can be formed in accordance with the position of the reinforcing bar group, or it can be disposed so as to avoid the center of the reinforcing bar group and other positions of the reinforcing bars.

<C> Surrounding by a steel plate. If a part of a bridge pier or the like supporting a structure is made of low-strength concrete, or if the reinforcing material is a reinforcing bar, it is a lap joint, or if a rim material 9 is arranged, naturally the concrete vertical portion 1 can be formed. The strength is reduced at that point. Therefore, the periphery of the easily breakable part 2 is surrounded by the steel plate 3,
Close and restrain concrete deformation. (FIG. 3) As a result, it is possible to secure the adhesive force between the reinforcing bar and the concrete required for transmitting the tensile force of the reinforcing bar and the axial compressive strength of the concrete. Although illustration of the strip reinforcing bars is omitted in the figure for simplicity of description, construction is possible even if strip reinforcing bars are installed.

<D> Dismantling of the easily breakable portion 2. When changing the height, a support base 41 such as a scaffold is assembled around the structure, and a lifting device 4 such as a jack is mounted thereon.
Is installed. Then, when it is time to change the height, the structure above the easy-to-break portion 2 is temporarily received by the lifting device 4 such as a jack. Then, the steel plate 3 surrounding the periphery of the easily breakable portion 2 is cut off by a gas burner or the like and removed. (FIG. 4) After the steel plate 3 is removed, the low-strength concrete is hung with a pick or the like and removed (FIG. 5). Then, the reinforcing material 5 such as a reinforcing bar or a steel frame inside the concrete is exposed. If necessary, the reinforcing material 5 is cut with gas. Alternatively, the concrete 91 between the upper and lower edge cutting members 9 is broken. In this case, since the edging material 9 exists above and below the fractured portion, the demolition can be performed reliably without affecting the concrete of the vertical portion 1 that should not be removed. In this case, if the surrounding concrete is dismantled and the reinforcing material 5 is cut as necessary, the concrete in the central portion can be removed in the state of the block 92. (FIG. 14)

<E> Change in height. After that, the height of the structure above the disassembled easy-to-break portion 2 is changed by extending or shortening the lifting device 4 supporting the structure. (FIGS. 2, 6) Lifting device 4
Is extended, the structure above the easily breakable portion 2 can be raised. If the lifting device 4 is shortened, the structure above the easily breakable portion 2 can be lowered.
In addition, as the lifting device 4, a lifting device such as a crane can be used depending on the weight of the structure other than the jack.

<D> Reinforcement material 5 connection. After changing the height, the reinforcing members 5 exposed from the upper and lower portions are connected. (FIG. 7) When the upper structure is raised, the length of the reinforcing member 5 is insufficient, so the additional reinforcing member 6 is added. When the reinforcing member is a reinforcing bar, one end of the additional reinforcing member 6 is pressed against the upper reinforcing bar, and the other end of the additional reinforcing member 6 is welded to the lower reinforcing bar. Thus,
It is possible to secure the same tensile and adhesive performance as a single seamless reinforcing bar. In the part where additional reinforcement 6 is added,
Arrange the reinforcing bar before the above-mentioned welding. It should be noted that the same effect can be achieved by adding the additional reinforcing member 6 to a structure such as steel frame concrete instead of reinforced concrete.

<E> Casting of additional concrete. After the upper and lower reinforcing members 5 are integrated, the periphery of the connecting portion of the reinforcing members 5 is thereafter surrounded by the formwork 7, and additional concrete 8 is cast inside the formwork 7. (Fig. 8) Normal concrete is used for most of the concrete 8 to be added, and finally the non-shrink mortar 81 is injected in the state of being surrounded by the auxiliary formwork 82 to prevent the volume of the concrete 8 from decreasing upon hardening. And integrate. (FIG. 9)

<F> Another embodiment. In the above embodiment, the case where the easily breakable part 2 is installed at one place has been described. However, as shown in FIG. 11, it is also possible to form the easily breakable portions 2 at the vertical portion 1 made of concrete of the structure, for example, at two places above and below the pillar. When it is time to lower the height, 2
Dismantle the easily breakable parts 2 at the places. Thereafter, the vertical part 1 between the upper and lower easily breakable parts 2 disassembled is removed. (The right side of FIG. 11) Then, after descending the portion above the easy-to-break portion 2, the reinforcing material 5 is connected up and down and concrete is poured around the periphery.
In the above embodiment, a structure in which all parts are made of concrete has been described. However, as shown in FIG. 12, a structure other than the vertical part 1 may be similarly used in a structure made of a steel material structure 2. Can be.

[0015]

As described above, the method for changing the height of a structure according to the present invention does not require a temporary structure when changing the height, and the height of the structure itself to be used in the future is not required. It is a method of ascending or descending. Therefore, the following effects can be obtained. <B> The construction and removal work, cost, and construction period of the temporary structure are not required, and a great economic effect can be expected as compared with the conventional method. <B> This is a method in which a portion that is easy to dismantle is arranged in advance, and at a predetermined time, that portion is disassembled and the structure is raised and lowered. Therefore, the required height can be easily changed by a simple operation. <C> Since the disassembled portion is sufficiently reinforced and the reinforcing members can be securely connected after disassembly, the safety of the structure before and after changing the height can be ensured. <D> Since a temporary structure to be used temporarily is not constructed, environmental pollution caused by disposal of the temporary structure can be suppressed. <E> In general, it is difficult to take measures against noise for temporary structures for economic and construction reasons. In this regard, the method of the present invention does not use a temporary structure, but uses a structure that is less likely to generate noise from the beginning and that will be used in the future. Therefore, the noise given to the surrounding environment can be minimized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a state before a height of a structure according to the present invention is changed.

FIG. 2 is an explanatory diagram of a state in which the height of a structure is changed.

FIG. 3 is an explanatory view of a construction order.

FIG. 4 is an explanatory view of a construction order.

FIG. 5 is an explanatory view of a construction order.

FIG. 6 is an explanatory view of a construction order.

FIG. 7 is an explanatory view of a construction order.

FIG. 8 is an explanatory view of a construction order.

FIG. 9 is an explanatory view of a construction order.

FIG. 10 is an explanatory view of a construction order.

FIG. 11 is an explanatory view of another embodiment.

FIG. 12 is an explanatory diagram of another embodiment.

FIG. 13 is an explanatory diagram of a state in which a trimming material is installed.

FIG. 14 is an explanatory view of a state in which a trimming member is installed and disassembled.

Continuation of front page (72) Inventor Riaki Oyato 2-2-2 Yoyogi, Shibuya-ku, Tokyo East Japan Railway Company

Claims (6)

[Claims] An easily breakable portion is formed in a concrete vertical portion of a structure, and when the height is changed, the easily breakable portion is disassembled, and the height of the structure above the easily breakable portion is reduced. A method of changing the height of a structure by connecting the reinforcement inside the concrete up and down after changing the height, and then pouring concrete around the connection of the reinforcement. 2. An easily breakable portion is formed in a vertical portion made of concrete of a structure, and when the height is changed, the easily breakable portion is disassembled, and the structure above the easily breakable portion is raised. A method of changing the height of a structure, in which the reinforcement inside the concrete is connected vertically and then concrete is poured around the connection of the reinforcement. An easily breakable portion is formed in a vertical portion made of concrete of the structure, and when the height is changed, the easily breakable portion is dismantled, and the structure above the easily breakable portion is lowered. A method of changing the height of a structure, in which the reinforcement inside the concrete is connected vertically and then concrete is poured around the connection of the reinforcement. 4. An easy-to-break portion is formed at two locations above and below a concrete vertical portion of the structure, and at the time of changing the height, the two easy-to-break portions are dismantled and dismantled. A method of changing the height of a structure by removing the members between the easy parts, connecting the reinforcement inside the concrete up and down, and then pouring concrete around the reinforcement connection. 5. The structure according to claim 1, wherein the easily breakable portion is filled with low-strength concrete, and the periphery thereof is surrounded by a steel plate and closed to restrain the deformation of the concrete. How to change the height of the structure. 6. In the easily breakable part, a member for cutting off the vertical part of the concrete is installed horizontally at two places, and the periphery thereof is surrounded by a steel plate and closed to restrain the deformation of the concrete. The method for changing the height of a structure according to claim 1, wherein the method is configured.