JP2671754B2 - Construction method of steel reinforced concrete structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention not only reduces the work of formwork by using an embedded formwork made of reinforced concrete, but the reinforcing bars used in the embedded formwork are an embedded formwork and a steel-framed reinforced concrete structure. The present invention relates to a method for constructing a steel-framed reinforced concrete structure that functions as a reinforcing bar for a main body.

[0002]

2. Description of the Related Art Reinforced concrete buried formwork has been used conventionally, but most of the rebars for reinforcing the buried formwork are housed in the buried formwork. Examples of the type of projecting outside the formwork include a projecting form for anchoring on the main body concrete pouring side of the buried formwork (see FIG. 3 (a)) and the buried formwork side adjacent to the buried formwork side. Projected for mechanical connection (Fig. 3
(See (b)) is only known.

[0003]

The conventional reinforced concrete buried formwork has the following drawbacks. (1) In the type in which the buried formwork is not connected to each other by the reinforcing bar, the reinforcing bar in the buried formwork cannot be considered as a reinforcing bar of the main body concrete after the main body concrete structure is completed. (2) Even in the type in which the buried formwork is connected to each other by a reinforcing bar, the integrity of the buried formwork and the concrete body is dependent only on the adhesion due to the unevenness of the inner surface of the buried formwork and the placement of the dowel. It was unreliable to use the reinforcing bars in the buried formwork to reinforce concrete. (3) Since the embedded formwork must sufficiently resist the concrete pressure when pouring concrete into the main body, many foam ties, corrugated materials, columns, etc. were required. (4) An anchor was required to prevent the embedded formwork from coming off after the main concrete structure was completed.

[0004]

DISCLOSURE OF THE INVENTION The present invention has improved the above-mentioned drawbacks of the conventional reinforced concrete embedded formwork, and the reinforcing bar used in the embedded formwork is used as a reinforcing bar for the embedded formwork and the steel frame reinforced concrete structure body. A method of constructing a functional steel reinforced concrete structure is provided.

The present invention uses a reinforced concrete embedded formwork in which horizontal reinforcing bars are projected from the end faces and bent at substantially right angles to the concrete placing side of the main body, and the ends of the horizontal reinforcing bars are made of steel reinforced concrete structure. Insert and fix it in the hole drilled in the steel frame embedded in the main body, attach the diversion formwork to the outside between the adjacent reinforced concrete embedded formwork connections, and then place the main body concrete on the formwork Is a method for constructing a steel-framed reinforced concrete structure.

[0006] The present invention has an important point in that it uses an embedded formwork made of reinforced concrete of a type that has not been known so far, and uses the reinforcing bar to fix it to the steel frame embedded in the steel frame reinforced concrete structure body. The reinforced concrete buried formwork used in the present invention is of a type in which horizontal reinforcing bars project from the end face and are bent at a substantially right angle to the concrete placing side of the main body. It is used to fix to the steel frame embedded in the steel frame reinforced concrete structure body. Then, a conversion form is attached to the outside at the connecting portion between adjacent embedded forms made of reinforced concrete, and this conversion form is fixed to the steel frame by sharing the embedded form and the corrugated material.

Since the present invention is constructed in this way, it has the following effects. (1) Since the reinforcing bar of the embedded formwork is fixed to the steel frame of the main body, the reinforcing bar of the embedded formwork can be used as a main structure by combining the measures to ensure the adhesion between the embedded formwork and the concrete body. It can be considered as a part in design. (2) Since the reaction force of the corrugated material that is shared by both the divert form and the buried form can be applied to the steel frame,
The columns supporting the embedded formwork can be omitted, and the number of foam ties and corrugated materials can be significantly reduced.
(3) Since the reinforcing bar of the embedded formwork is fixed to the steel frame of the main body, there is no risk of the embedded formwork coming off after the completion of the main body.
(4) The steel frame of the main body is protected against corrosion by the concrete that fills the joints between the embedded forms.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a buried form used in the present invention in an upright state, (a) is an elevation view, (b) is a plan view, and (c) is a side view.

A horizontal reinforcing bar 1 projects from a rectangular buried formwork concrete 3, and the reinforcing bar 1 is bent at about 90 ° toward the concrete side of the main body. The number and position of the reinforcing bars 1 are determined in consideration of the size and weight of the embedded formwork, the weight and shape of the concrete body.

A case where the construction method of the present invention is used to construct a box-shaped concrete pier will be described as an example.

FIG. 2 (a) is a cross-sectional view showing the arrangement of formwork for constructing a box-shaped concrete pier, and FIG. 2 (b).
[Fig. 2] is a cross-sectional view of the concrete-embedded formwork joint at that time, and Fig. 2C is a cutaway perspective view of the concrete-embedded formwork joint.

The steel frames 5 are built at predetermined positions at predetermined intervals. The reinforced concrete buried formwork 4 manufactured in a separate process is installed on both sides so that the space between the steel frames 5 is filled.
The horizontal reinforcing bar 1 is inserted into the hole formed in the flange of the steel frame 5 and fixed. In order to fill the gap of the connection part of the buried form 4, the diversion form 7 is installed on the outside, and the corrugated material 9 is used to fix it together with the buried form 4 to the flange of the steel frame 5. To fix the embedded formwork 4 to the steel frame 5, as described above, the horizontal reinforcing bar 1 of the embedded formwork 4 is inserted into the hole formed in the flange of the steel frame 5 to secure the necessary fixing length on the back surface thereof. However, if it is desired to fix it more adequately, it is sufficient to use a screw-reinforcing bar as the reinforcing bar 1 and insert it into the hole and then fix it with a nut. It may be welded. When inserting the reinforcing bar 1 into the hole formed in the flange of the steel frame 5, a large number of reinforcing bars 1 are simultaneously inserted into a large number of holes at the same time. A jig having a funnel that is easy to assemble and disassemble may be used, or a large number of reinforcing bars 1 may be previously passed through the holes of the strip plate at predetermined intervals and the strip plate may be attached to the steel frame 5 together.

In addition to the steel frame 5, a reinforcing steel frame or reinforcing bar is usually arranged in the cast portion of the main body concrete. In particular, it is preferable to provide a reinforcing bar that intersects with the reinforcing bar 1 at the connection portion of the embedded formwork 4. The embedded formwork 4 may be joined with foam ties to make the structure more rigid. Steel frame 5 to strengthen the cover concrete reinforcement
A stat dowel may be provided on the concrete cover.

Main body concrete is placed in the main body concrete placing portion 6 in the form frame constructed as described above. Naturally, the main body concrete is also filled in the connection portion of the embedded form 4, and the embedded form 4 is firmly integrated with the main body and the adjacent embedded form 4. After the main body concrete hardens, the diversion form is removed from the mold to complete the work.

In the present embodiment, the construction method of the present invention has been described by taking as an example the case where it is used to construct a box-shaped concrete pier. However, the construction method of the present invention can be applied to general structural members such as walls, columns and beams. Can be used for construction. Although H-shaped steel is used as the steel frame 5 in the embodiment, a steel frame truss or the like composed of a plurality of members may be used.

[0017]

【The invention's effect】

(1) By using the buried formwork made of reinforced concrete, not only the work of arranging the reinforcing bars at the construction site of the main body is reduced, but also the work of removing, transferring and cleaning the formwork is reduced. (2) Since the embedded formwork made of reinforced concrete can be manufactured in parallel with the construction of the main body, the construction becomes faster.
(3) Since the reinforcing bar of the embedded formwork is fixed to the steel frame of the main body, the reinforcing bar of the embedded formwork can be used as a main structure by combining the measures to ensure the adhesion between the embedded formwork and the concrete body. It can be considered as a part in design. (4) Since the reaction force of the corrugated material, which is shared by both the diverting form and the buried form, can be exerted on the steel frame, it is possible to omit the pillars that support the buried form, and to eliminate foam ties and The number can be significantly reduced.

[Brief description of the drawings]

FIG. 1 shows an example of a buried form used in the present invention in a standing state, (a) is an elevation view, (b) is a plan view, and (c) is a side view.

FIG. 2 (a) is a horizontal cross-sectional view showing an arrangement of a formwork for constructing a box-shaped concrete bridge pier, and FIG. 2 (b) is a cross-sectional view of a concrete-embedded formwork connection portion at that time. (C)
[Fig. 4] is a cutaway perspective view of a concrete-buried formwork connection portion.

[Fig. 3] Fig. 3 shows a conventional reinforced concrete embedded formwork in which reinforcing bars project outside concrete, (a) shows one projecting to the main body concrete pouring side for anchors, (b).
Indicates the one projecting to the adjacent buried form side for mutual mechanical connection.

[Explanation of symbols]

1 ・ ・ Horizontal reinforcement of buried formwork, 2 ・ ・ Vertical reinforcement of buried formwork, 3 ・ ・ Buried formwork concrete, 4 ・ ・ Buried formwork, 5 ・ ・ Steel frame, 6 ・ ・ Main body concrete pouring Facility,
7 ・ ・ Diversion formwork, 8 ・ ・ Main body concrete reinforcing bar, 9 ・
・ Corrugated material, 10 ・ ・ Anchor bars, 11 ・ ・ Mechanical joints

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kumiko Suda 2-19-1 Tobita-Su, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (56) Reference Japanese Patent Laid-Open No. 50-133626 (JP, A) Kaihei 4-55549 (JP, A)

Claims (1)

(57) [Claims] 1. An embedded formwork made of reinforced concrete, in which horizontal reinforcing bars are projected from the end faces and bent substantially at right angles to the concrete pouring side of the main body, and the ends of the horizontal reinforcing bars are used for the steel frame reinforced concrete structure main body. It is characterized by inserting it into the hole drilled in the steel frame to be fixed and fixing it, attaching a diversion formwork to the outside at the connection part between adjacent reinforced concrete embedded formwork, and then placing the main body concrete on the formwork Method of constructing steel-framed reinforced concrete structure