JPS61165450A - Outer contour body for constructing reinforced concrete beam - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an outer shell for constructing a reinforced concrete beam, and more specifically, to constructing a reinforced concrete beam in cooperation with a portion of a core formed by horizontally suspending upper and lower main reinforcements in cast-in-place concrete. It relates to an outer shell that constitutes a beam.

[Conventional technology]

In the precast concrete construction method, pillars and the like in addition to wall plates and floor plates are manufactured in advance from concrete, and the respective joints are sequentially connected by welding or bolts to construct the desired building.

[Problem that the invention seeks to solve]

However, as a matter of course, compared to the cast-in-place concrete construction method, this requires various improvements, especially in the joints, and is also structurally more complex, making the work extremely inconvenient. That is, for example, when processing the ends of upper and lower main bars for beams that have been pre-inserted into pre-cast concrete, it is necessary to correct the position to the correct position, which is very troublesome. .

Therefore, the present invention seeks to provide an outer shell made of precast concrete that enables the construction of reinforced concrete beams that can obtain the required degree of freedom in the end treatment of upper and lower main reinforcements in the same way as in conventional cast-in-place concrete construction methods. It is something to do.

[Means for solving problems]

In order to achieve the above object, the present invention has a configuration in which shear reinforcing bars for beams are installed in a concrete trough-like body having a U-shaped cross section, in a direction perpendicular to the longitudinal direction of the trough-like body, and in an upper part thereof. The trough-like body is made to protrude upward, and the left and right side parts and the lower part are buried within the wall thickness of the trough-like body, with the inner peripheral edge of each shear reinforcing bar aligned with the inner peripheral surface of the trough-like body. By this, the elements are arranged in a line at a predetermined interval,
The upper and lower main bars for dyeing are not buried within the wall thickness of the trough-like body.

The above-mentioned shear reinforcing bars are so-called starasopic bars, and in addition to those formed into an endless frame shape, they can also be wound in an 'IX spiral shape and stretched so that each loop is at the required spacing. good.

[Effect]

As described above, the outer shell of the present invention only has shear reinforcing bars for dyeing embedded in the concrete trough-like body, but does not have upper and lower main bars for medicinal purposes embedded therein. Therefore, it is possible to construct the desired reinforced concrete beam by using this as a formwork in the construction of a part of the core formed by horizontally suspending the upper and lower main reinforcement for the beam in cast-in-place concrete, and the beam can be constructed with a part of the core having the above-mentioned shear. It has a predetermined strength constrained by reinforcing bars, eliminating the need for assembling and dismantling formwork on site and arranging shear reinforcing bars, making full use of the advantages of the precast concrete construction method. Regarding the end treatment of the upper and lower main reinforcements, we have made it possible to easily construct reinforced concrete beams that have the same degree of freedom as the cast-in-place concrete method.

〔Example〕

a shows an example of the outer shell of the present invention, and the outer shell a
The top surface and front 11t (or left and right) ends are open,
It consists of a trough-like body 1 made of concrete and having a so-called U-shaped cross section, and a plurality of endless frame-shaped beam shear reinforcing bars 2 embedded in the wall thickness of the trough-like body 1 and forming a square shape.

This shear reinforcing bar 2 is oriented perpendicularly to the longitudinal direction of the trough-like body 1, that is, vertically, and has an upper portion 2° projecting above the trough-like body 1, and the inner peripheral edges of the left and right side portions and the lower portion. In a state where is aligned with the inner circumferential surface of the gutter-like body 1,
They are lined up at the required intervals. In addition, a large number of small irregularities are formed on the inner circumferential surface of the trough-like body l to improve the bite of post-cast concrete.

b is an outer shell constituting a reinforced concrete column constructed together with a reinforced concrete beam constructed using the above outer shell a; Square tube body 3,
It is made up of a plurality of pillar shear reinforcing bars 4 in the shape of an endless frame, each having a rectangular shape and buried within the wall thickness of this rectangular cylinder 3.

The shear reinforcing bars 4 are oriented perpendicularly to the longitudinal direction of the rectangular cylinder 3, that is, horizontally, and the inner circumferential edge of each shear reinforcing bar 4 is aligned with the inner circumferential surface of the rectangular cylinder 3. They are arranged at intervals. Further, a large number of small irregularities are formed on the inner circumferential surface of the rectangular cylinder 3 to improve the adhesion of post-cast concrete, which is similar to the outer shell a.

In order to manufacture the above-mentioned outer shell a, as shown in FIG.
A sheet-like cushioning material 6 is wrapped around the outer circumference of the inner mold 5,
Shear reinforcing bars 2 are fitted on the outside of the reinforcing bars 2 and aligned at required intervals, and are positioned inside the outer mold 7.
, 7, shear the fresh concrete between the upper part of the reinforcing bar 2 2°
The mold is cast and filled into a U-shaped cross section until it protrudes, and is removed from the mold after hardening.

If a release sheet is used as the cushioning material 6, which is made by bonding two synthetic resin films with a large number of air pockets formed between them, the above-mentioned release operation can be easily performed, and the release sheet can also be air-filled. This makes it possible to form the small irregularities on the inner circumferential surface of the rectangular cylinder 1. The manufacture of the outer shell A is different from that of the outer shell a in that the fresh concrete is filled up to the opening surface of the outer mold 7 and the upper part of the shear reinforcing bars 4 is not protruded, but the other aspects are the same.

Next, the situation in which a reinforced concrete beam is constructed using the above-mentioned outer shell a will be explained with reference to FIG. 4, together with the situation in which a reinforced concrete column is constructed using the outer shell.

Reference numeral 8 denotes a residential main reinforcement installed in advance on a predetermined foundation or slab, and the outer shell is suspended and fitted onto the main reinforcement 8 from above, with the upper part of the main reinforcement 8 protruding from the upper end opening. Keep standing.

In this way, the outer shell a is horizontally suspended across the upper opening edges of the adjacent outer shells held upright.

In this outer body a, more precisely, in the shear reinforcing bars 2 aligned with the outer body a, the tip portions of the upper and lower main reinforcements 9 for beams, which are inserted before or after the horizontal mounting of the outer shell a, are inserted. In addition to performing necessary end treatments such as inserting the outer shell into the upper end opening, a ready-made floor template C is placed between adjacent ones of the horizontally suspended outer shell A, and the required reinforcement is arranged. do.

After that, from above on the floor template C, the outer shell a,
Pour ready-mixed concrete from each opening inside b.

As a result, the concrete slab, reinforced concrete beams, and studs are constructed in an integrated state.

〔Effect of the invention〕

As is clear from the above description, in the outer shell of the present invention, the shear reinforcing bars on the beam side are simply buried in the wall thickness of the concrete gutter-like body in aligned rows at the required intervals.
In particular, unlike beams that form a solid body by burying the upper and lower main reinforcements on the beam side, the beams are installed horizontally between the required columns at the site and inserted into the shear reinforcing bars installed in rows before or after the horizontal installation. After horizontally placing the main reinforcements in the upper and lower predetermined positions,
The desired reinforced concrete beam can be constructed by pouring and filling fresh concrete through the opening on the top surface.

In other words, the outer shell of the present invention can be used to construct a reinforced concrete beam in place of a formwork in the construction of a part of a core formed by horizontally suspending upper and lower main reinforcements on the beam side in cast-in-place concrete, and the beam can be A portion of the core is restrained by the shear reinforcing bars and has a specified strength, eliminating the need for assembling and dismantling formwork on site and arranging shear reinforcing bars, thereby leveraging the advantages of precast concrete construction. This makes it possible to construct reinforced concrete beams that can be fully utilized and have the same degree of freedom as the cast-in-place concrete construction method when it comes to end treatment of the upper and lower main reinforcements.

[Brief explanation of drawings]

Drawings 1 (A) and (B) are perspective views and sectional views of the outer shell for constructing concrete beams of the present invention, and Figures 2 (A) and (B) are concrete columns that can be used together with the outer shell for constructing concrete beams of the present invention. A perspective view and a cross-sectional view of the main parts of the construction shell, FIG. 3 is a cross-sectional view explaining the manufacturing status of both shells, and FIG.
B) and (C) are explanatory diagrams for explaining the situation of constructing a concrete beam using the outer shell of the present invention, together with the construction of a concrete column using the above-mentioned outer shell for constructing a concrete column. 1... Concrete gutter-like body, 2...
・Shear reinforcement on the beam side, 2°...the upper part,
a: Outer body for constructing reinforced concrete beams. Figure 1 Figure 3 Figure 2 (A) (B) (C)

Claims (1)

[Claims] 1. Shear reinforcing bars for beams are installed in a concrete trough-like body with a U-shaped cross section, in a direction perpendicular to the longitudinal direction of the trough-like body, with the upper part protruding above the trough-like body, and on the left and right sides. By embedding the inner peripheral edge of each shear reinforcing bar within the wall thickness of the trough-like body with the inner peripheral edge of each shear reinforcing bar aligned with the inner peripheral surface of the trough-like body, the reinforcing bars can be arranged in a line at a predetermined interval. An outer shell for constructing reinforced concrete beams.