JPH07286374A - Construction of expansion joint - Google Patents

Abstract

PURPOSE:To improve the efficiency of placing operation, and to shorten the term of works by mounting metal lath forms on the expansion joint section of a concrete wall, a beam, etc., and bearing the forms by an air tube located under an adjacent state. CONSTITUTION:Forms consisting of a metal lath are installed at the end face of an expansion joint section (a space section) ensuring the expansion allowance of a concrete structure while being borne by an air tube 18 arranged in the space section under an adjacent state. Concrete 11 and 13 on both sides are placed simultaneously, concrete is hardened, air in the air tube 18 is extracted as the metal lath forms are left as they are, and the air tube 18 is drawn out. Accordingly, placing operation is simplified, thus improving workability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for constructing an expansion joint for structurally separating adjacent buildings. More specifically, when mutual structures are subject to expansion / contraction due to temperature change or vibration due to earthquake, etc. The present invention relates to a construction method of an expansion joint for preventing a crack and a deformation of a building from exerting harmful effects on each other mechanically.

[0002]

2. Description of the Related Art Conventionally, as a method for constructing an expansion joint of this type, for example, Japanese Patent Laid-Open No. 4-854 has been proposed.
The construction method disclosed in Japanese Patent No. 29 is known as a conventional example.

FIG. 7 shows the construction method of the expansion joint of this conventional example. First, after forming the first concrete structure 1, the reinforcing bars 3 such as beams are assembled from the joint end surface 2 of the concrete structure 1 at a predetermined distance. Next, the form 5 of the second structure 4 is arranged so as to accommodate the reinforcing bar 3. Then, a partition plate 6 is inserted between the joint end face 2 and the bar arrangement 3, and sand 7 is poured between the partition plate 6 and the joint end face 2 to fill the space. Further, concrete is placed in the mold 5 of the second structure 4, and after the concrete is hardened, the partition plate 6 and the sand 7
Is a construction method for forming an expansion joint by removing the.

In addition, as another conventional construction method of the expansion joint, which is different from the above-mentioned one, the form frames of the adjacent structures are arranged by interposing a cushioning material such as styrofoam, and the structures of the respective structures are arranged. A construction method is known in which concrete is poured substantially simultaneously in a mold to form a portion where the cushioning material is interposed as an expansion joint. In this case, a cushioning material such as expanded polystyrene remains in the expansion joint even after the structure is completed.

[0005]

However, in the construction method of the expansion joint of this conventional example, since the concrete of the second structure 4 is poured after the first concrete structure 1 is formed, the construction period is increased. There is a problem in that the work is undesirably extended by unnecessarily extending the work, and that the work of removing the partition plate 6 and the sand 7 after the concrete hardens is complicated and requires a lot of manpower and labor.

Further, in the construction method of the conventional expansion joint, since the cushioning material such as styrofoam is left in the expansion joint, when the structure shakes, the styrofoam or the like is squeezed. There is a problem that sound is generated and it is uncomfortable.

Therefore, in the construction method of the expansion joint in the conventional example, the concrete of the structures adjacent to each other is poured substantially at the same time to shorten the construction period and improve the workability, and the buffer is provided in the expansion joint. There is a problem that must be solved in that the structure does not remain and does not generate an unpleasant squeaking noise when the structure shakes.

[0008]

As a concrete means for solving the above-mentioned problems of the conventional example, the present invention provides a mold for a first concrete structure and a mold for a second concrete structure in a predetermined space portion. In the space of the first and second concrete structures after the plurality of air tubes are arranged adjacent to each other in the space and the air tubes are filled with air to support the frame. In order to provide a construction method of an expansion joint, which is characterized in that concrete is poured into, and after the cast concrete is cured, the air tube is removed to leave a space portion,
The mold facing the space is a metal lath mold, the air tubes arranged in the adjoining state are in a mutually connected state, and the air tube has an air valve. It is provided.

[0009]

In the construction method of the expansion joint according to the present invention, the formwork of the first concrete structure and the formwork of the second concrete structure are formed with a predetermined space, and a plurality of spaces are formed in the space. The air tubes are arranged adjacent to each other, the air tubes are filled with air to support the mold, and then concrete is poured into the molds of the first and second concrete structures, and the concrete is poured. After the concrete has hardened, by removing the air tube and leaving a space, it is possible to place concrete in adjacent structures at approximately the same time, shortening the construction period, simplifying the work, and saving labor. Can be realized. Also,
Since no buffer is left inside the expansion joint, no unpleasant squeaking noise is generated when the structure shakes.

Further, since the formwork facing the space is a metal lath formwork, after the concrete in the formwork is hardened, the metal lath formwork can be left as it is, and the work of disassembling the formwork can be performed. It is not necessary to carry out, and workability can be improved.

Further, since the air tube is provided with an air valve, air can be filled or exhausted from this air valve.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an example for carrying out the present invention will be described in the order of steps with reference to the drawings. First, FIGS. 1 to 6 explain a method of constructing a concrete wall of a concrete structure such as a building or an expansion joint portion such as a beam.

FIG. 1 is a vertical cross-sectional view showing a state in which molds of concrete structures adjacent to each other are formed, and a mold 12 of a first concrete structure 11 and a second concrete structure 13 are formed. The mold 14 and the frame 14 are formed with a predetermined space 15. The width of the space portion 15 is such a width that the first concrete structure and the second concrete structure do not affect each other when the first concrete structure and the second concrete structure expand or contract due to temperature change or vibrate due to an earthquake or the like. .

Further, the mold 12a facing the space 15 is
Each of the metal lath molds 14a uses a metal lath mold, which allows the metal lath molds 12a and 14a to be left as they are without being removed after the concrete, which will be described later, is poured into the mold and hardened. Therefore, it is not necessary to dismantle the formwork, which not only simplifies the work and saves labor, but also protects the concrete as a surface layer.

Further, each concrete structure 11, 1
3 opposing molds 12, 12a and 14, 14a
Are held apart from each other by hook separators 16, and the hook separators 16 support a plurality of single tube pipes 17 outside the mold.

Next, a plurality of air tubes 18 which are not filled with air are hung in the space 15 and arranged in a substantially vertical state, and the air tubes 18, 18 ... To support. At this time, air tube 1
The tip portion 18a of 8 is disposed so as to be located about 30 cm to 50 cm above the upper surface 20 on which concrete will be poured later (see FIGS. 2 and 3). By arranging in this way, the air tube 18
The work of filling and exhausting air into the inside can be easily performed, and the concrete to be placed does not enter the space portion 15.

The air tube 18 has a substantially cylindrical shape and has a predetermined length. An air valve 21 is attached to the tip of the air tube 18, and air is filled or exhausted from the air valve 21. Can be made.

Next, as shown in FIGS. 4 and 5, air is filled from the air valve 21 of the air tube 18 by an appropriate compressor or the like, and the air tube 18 is expanded to support the mold. Then, concrete is poured into the molds 12 and 12a of the first concrete structure 11 and the molds 14 and 14a of the second concrete structure 13 at substantially the same time.

Further, after the cast concrete is cured and hardened, the air valve 21 is opened and the air in the air tube 18 is exhausted and contracted. Then, by removing the air tube 18 in a contracted state from the space portion 15, the space portion 15 formed between the concrete structures 11 and 13 adjacent to each other is formed as an expansion joint portion ( (See FIG. 6).

Then, the single pipe 17 and the hook separator 16 are removed, and the metal lath frame 12a,
By dismantling the formwork 12, 14 other than 14a,
Construction of a structure having an expansion joint structure according to the present invention is performed.

[0021]

As described above, in the construction method of the expansion joint according to the present invention, the formwork of the first concrete structure and the formwork of the second concrete structure are formed with a predetermined space portion, A plurality of air tubes are arranged in a substantially vertical state in the space, and the air tubes are filled with air, and then in the formwork of the first concrete structure and the formwork of the second concrete structure. By pouring concrete, and after the concrete has hardened, by removing the air tube, it is possible to perform the concrete pouring of the structures adjacent to each other substantially at the same time, which shortens the construction period and simplifies the work. It is possible to save labor, improve workability, and reduce costs. Further, since the buffer is not left inside the expansion joint, there is an excellent effect that an unpleasant squeaking noise is not generated when the structure shakes.

Further, since the formwork facing the space is a metal lath formwork, after the concrete in the formwork is hardened, the metal lath formwork can be left as it is, and the work of disassembling the formwork can be performed. It is not necessary to perform the above, and it is possible to achieve an excellent effect that the work can be simplified, the labor can be saved, and the workability can be improved.

Further, since the air tube is provided with the air valve, air can be filled or exhausted from the air valve, so that the air tube can be expanded to support the mold or contract. Thus, various excellent effects can be obtained in that it can be easily removed from the space.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a state in which a mold is formed in a construction method for an expansion joint according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a state in which an air tube is arranged in the construction method for the expansion joint according to the present invention.

FIG. 3 is a front view of an essential part showing a state in which an air tube is arranged in the construction method for the expansion joint according to the present invention.

FIG. 4 is a vertical cross-sectional view showing a state where concrete is placed in a formwork in the construction method of the expansion joint according to the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a vertical cross-sectional view showing a state in which the air tube is taken out in the construction method for the expansion joint according to the present invention.

FIG. 7 is a vertical cross-sectional view showing a construction method of an expansion joint according to a conventional example.

[Explanation of symbols]

 1 1st concrete structure 2 Joint end surface 3 Bar arrangement 4 2nd structure 5 Formwork 6 Partition plate 7 Sand 11 1st concrete structure 12 Formwork 12a Metal lath formwork 13 2nd concrete structure 14 Formwork Frame 14a Metal lath formwork 15 Space part (expansion joint part) 16 Hook separator 17 Single tube pipe 18 Air tube 18a Tip part 19 String 20 Top surface 21 Air valve

Claims (4)

[Claims] 1. A formwork of a first concrete structure and a second formwork.
Forming a concrete structure formwork with a predetermined space part, arranging a plurality of air tubes in the space part in an adjacent state, filling the air tubes with air, and then supporting the formwork, A method for constructing an expansion joint, characterized in that concrete is placed in the formwork of the first and second concrete structures, and after the placed concrete is hardened, the air tube is removed to leave a space. . 2. The method for constructing an expansion joint according to claim 1, wherein the mold facing the space is a metal lath mold. 3. The air tubes arranged adjacent to each other are connected to each other.
Construction method of expansion joint described in. 4. The method for constructing an expansion joint according to claim 1, wherein the air tube is provided with an air valve.