JPS61165453A - Reinforced concrete pillar and its construction - 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] [Industrial Field of Application] The present invention relates to a core portion formed by main reinforcing bars in cast-in-place concrete, and a shearing system for columns that surrounds and restrains this core portion. This article relates to a reinforced concrete column consisting of an outer shell with embedded reinforcing bars, and its construction method.

[Conventional technology]

In the precast concrete construction method, pillars and the like are manufactured in advance from concrete on the walls and floorboards, and the respective joints are successively 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, which is extremely inconvenient in terms of work. That is, for example, when connecting column main reinforcements that have been previously inserted into precast concrete, it is necessary to perform so-called resetting to correct the position to the normal position, which is very troublesome.

Therefore, the present invention aims to easily obtain a reinforced concrete column using a precast concrete outer shell that allows the required degree of freedom for connecting main reinforcements in the same manner as in the conventional cast-in-place concrete construction method. .

[Means for solving problems]

The configuration of the present invention for achieving the above object is as follows.

That is, in the reinforced concrete column of the present invention, a plurality of main reinforcements are erected in a core portion formed of cast-in-place concrete, and the shear reinforcement of the column layer is placed horizontally within the wall thickness of the concrete cylinder. The core portion is surrounded by an outer body which is buried in rows at required intervals.

In addition, the method for constructing a reinforced concrete column of the present invention involves the process of planting multiple main bars in the required arrangement, and horizontally installing shear reinforcing bars in the column layer within the wall thickness of a concrete cylinder with open ends at both the top and bottom. a step of suspending the outer shell from above the main reinforcing bars so that the outer shell is buried in rows at a predetermined interval so that the upper part of each main reinforcing bar protrudes above the outer shell; It consists of the step of pouring and filling concrete through the upper end opening of the outer shell to form a core portion in which the main reinforcing bars are buried.

In the above, the emphasis is on the fact that the outer body made of a concrete cylinder only buries the shear reinforcement of the column layer, but does not bury the main reinforcement of the column layer. This is a so-called loop thread, and in addition to being formed into an endless frame shape, it may also be one wound in a spiral shape and stretched so that each loop is at a required interval.

[Effect]

In this way, in the present invention, the outer body only has the shear reinforcing bars of the column layer buried in the concrete cylinder, but does not embed the main reinforcement of the column layer. By constructing a core part with main reinforcements erected, and at the same time using the above-mentioned outer shell as a formwork, the desired reinforced concrete column can be constructed, and the core part of the column can be It has a predetermined compressive strength constrained by reinforcing bars.

In other words, while making full use of the advantages of the precast concrete construction method, it is possible to construct the desired reinforced concrete column with the same degree of freedom as with the cast-in-place concrete construction method regarding the connection of main reinforcements.

〔Example〕

Examples of the reinforced concrete column and its construction method according to the present invention will be described below, together with a reinforced concrete beam and its construction method.

A is an outer shell for constructing columns, and this outer shell a is a rectangular cylinder 1 made of concrete with openings at both ends in the longitudinal direction, that is, at both the top and bottom ends.
and a plurality of endless frame-shaped pillar shear reinforcing bars 2 embedded in the wall thickness of this rectangular cylindrical body.

The shear reinforcing bars 2 are oriented perpendicularly to the longitudinal direction of the rectangular cylinder l, that is, horizontally, and the inner peripheral edge of each shear reinforcing bar 2 is aligned with the inner circumferential surface of the rectangular cylinder 1. They are arranged at intervals. Further, a large number of small irregularities are formed on the inner circumferential surface of the rectangular cylinder 1 to improve the adhesion of post-cast concrete.

b is an outer shell for beam construction constituting a reinforced concrete beam constructed together with a reinforced concrete column constructed using the above outer shell a; It consists of a trough-like body 3 made of concrete and having an open U-shaped cross section, and a plurality of endless frame-shaped beam shear reinforcing bars 4 buried in the thickness of the trough-like body 3 and forming a square.

The shear reinforcing bars 4 are oriented perpendicularly to the longitudinal direction of the trough-like body 3, that is, vertically, and have the upper portion 4″ projecting above the trough-like body 3, and the inner peripheral edges of the left and right side portions and the lower portion are They are aligned at required intervals in a state where they are aligned with the inner circumferential surface of the gutter-like body 3. Also, on the inner circumferential surface of the gutter-like body 3,
As with the square tube body 1, a large number of small irregularities are formed to improve the adhesion of post-cast concrete.

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, pour and fill fresh concrete until it reaches the upper surface of the outer mold 7, and remove 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 the case of the outer shell A in that the filling of fresh concrete is not filled until it reaches the upper surface of the outer mold 7, that is, until the upper part 4'' of the shear reinforcing bar 4 protrudes. However, everything else is the same.

Next, the situation of constructing a reinforced concrete column using the above-mentioned outer shell a will be explained with reference to FIG. 4, together with the situation of building a reinforced concrete beam using the above-mentioned outer shell.

Reference numeral 8 denotes a column main reinforcement installed in advance on a predetermined foundation or slab, and the outer shell a 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 shells a held upright are horizontally suspended over the upper end opening edges of the adjacent ones.

Inside this shell, more precisely, inside the shear reinforcing bars 4 which are added in rows to the shell, insert the tip portions of the upper and lower main reinforcements 9 for the beams, which are inserted before or after the shell is laid horizontally. , perform the necessary end treatment such as inserting it into the upper end opening of the outer shell a, and place the ready-made floor template C between the adjacent ones of the horizontally suspended outer shells, and make the required reinforcement arrangement. do.

After that, from above on the floor template C, the outer shell a,
Fresh concrete is poured from each opening in b to create core parts 10 and 10'.

As a result, the reinforced concrete column of the present invention (FIG. 5), in which the core portion IO is surrounded by the outer shell a, becomes the same as the reinforced concrete beam (FIG. 6), in which the core portion 10' is surrounded by the outer shell a, and the concrete slab 11.
It is constructed in a state where it is integrated with.

〔Effect of the invention〕

As is clear from the above description, the reinforced concrete column according to the present invention has an outer shell in which shear reinforcing bars of the column layer are buried in aligned rows at required intervals within the wall thickness of the concrete cylinder. Unlike the case where the main reinforcing bars of the column layer are also buried to form a solid body, this outer shell is fitted and erected on the main reinforcing bars planted on the required foundation or slab at the site, and then the upper end opening is installed. It can be easily constructed by pouring and filling fresh concrete through.

In other words, in the present invention, the outer body only embeds the shear reinforcing bars of the column layer in a concrete cylinder, and does not embed the main reinforcement of the column layer. The desired reinforced concrete column can be constructed by constructing a core portion with main reinforcements erected, and using the outer shell as a formwork, and the column is reinforced by shearing the core portion as described above. It has a predetermined compressive strength that is constrained by reinforcement, eliminating the need for assembling and dismantling formwork on site and arranging shear reinforcing bars.
While making full use of the advantages of the precast concrete construction method, it is possible to construct reinforced concrete columns that have the flexibility of connecting the main reinforcements compared to the cast-in-place concrete construction method.

[Brief explanation of drawings]

Figures 1 (A) and (B) are perspective views and cross-sectional views of the main parts of the outer shell that constitutes the reinforced concrete column of the present invention, and Figures 2 (A) and (B) are reinforced concrete constructed together with the concrete column of the present invention. A perspective view and a cross-sectional view of an outer shell for beam construction that can be used for beams, FIG. 3 is a cross-sectional view for explaining the manufacturing status of both the above-mentioned outer shells, and FIG. 4 (A)
(B) and (C) are explanatory diagrams for explaining the construction of the reinforced concrete column of the present invention together with the construction of the reinforced concrete beam using the above-mentioned outer shell for beam construction. Cross-sectional view, Figure 6 is a cross-sectional view of a reinforced concrete beam constructed at the same time. 8... Main reinforcement, 10... Core part, ■
・・・・・・Concrete cylindrical rectangular cylinder, 2...
... Shear reinforcing bars for columns, a ... Outer body for constructing columns.

Claims (1)

[Scope of Claims] 1. A plurality of main reinforcements are erected in a core portion formed of cast-in-place concrete, and shear reinforcement bars for columns are provided within the wall thickness of the concrete cylinder, A reinforced concrete column characterized in that the core portion is surrounded by an outer shell which is buried in a horizontal state and arranged in rows at a required interval. 2. The process of planting multiple main reinforcements in the required arrangement, and aligning the shear reinforcing bars for the columns at the required intervals in a horizontal state within the wall thickness of a concrete cylinder with both upper and lower ends open. The buried outer shell is suspended from above the main reinforcing bars, and the upper part of each main reinforcing bar is projected above the outer shell, and concrete is poured into the outer shell through the upper end opening. A method for constructing a reinforced concrete column, comprising the steps of forming a core portion in which the main reinforcing bars are buried.