JPH0688377A - Method for connection between slab and concrete column - Google Patents

Abstract

PURPOSE:To provide the title method wherein the lower opening of each sleeve joint is not shut with mortar injected from the outside of a column into a clearance between the column and a slab, before grouting material is injected into the sleeve joints. CONSTITUTION:This is a method of connecting a precast concrete column, which has a plurality of sleeve joints at the lower end part thereof, to a plurality of column-reinforcing bars for the lower floor, which bars project above a concrete slab. A hooped reinforcing bar 22 is located on the slab so as to surround the peripheral part of the projecting parts of the column-reinforcing bars. The column is stood on the slab in the condition that the projecting parts of respective column-reinforcing bars are placed in the sleeve joints 18 and mortar 26 is placed at the outside part of the hooped reinforcing bar 22 of clearance parts between the upper surface of the slab and the lower surface of the column, from around the hooped reinforcing bar 22. After that, grouting material 28 is injected into both the sleeve joints and a space provided with the mortar 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete column having a plurality of sleeve joints opening downward, and a plurality of lower-column pillar rebars projecting upward from a concrete slab to be received by the sleeve joint. On how to connect to.

[0002]

2. Description of the Related Art As one of the methods for connecting a precast concrete column to a concrete floor slab, a spacer for maintaining a gap between the column and the floor slab is arranged on the floor slab, and then the precast A concrete column is built on the floor slab in such a manner that the column reinforcing bars projecting upward from the floor slab are received by the plurality of downwardly-opening sleeve joints provided on the column, and then between the column and the floor slab. There is a method of injecting mortar into the outer peripheral portion of the gap from the outer peripheral side of the column, and then injecting grout material into the sleeve joint and the rest of the gap (Japanese Patent Laid-Open No. 2-248)
543).

However, according to this method, when mortar is injected into the outer peripheral portion of the gap between the column and the floor slab from the outer peripheral side of the column, the lower end opening of the sleeve joint is closed by the mortar, resulting in grouting. Voids may form in the sleeve joint due to the material not being injected into the sleeve joint from below and not being filled with grout material.

[0004]

SUMMARY OF THE INVENTION The present invention prevents the lower end opening of a sleeve joint from being blocked by mortar which is injected into the gap between the pillar and the slab from the outside of the pillar prior to the injection of grout material into the sleeve joint. The purpose is to

[0005]

The present invention provides a precast concrete column having a plurality of sleeve joints at its lower end,
A method of connecting to a plurality of pillar rebars of a lower floor projecting above a concrete slab, wherein hoop-shaped rebars are arranged on the slab so as to surround the outer periphery of the projecting portion of the pillar rebars, and the columns are Building on the slab with the protrusion of the column rebar received in the sleeve joint,
Of the gap between the upper surface of the slab and the lower surface of the pillar,
Mortar is arranged at a portion outside the hoop-shaped reinforcing bar from a side around the hoop-shaped reinforcing bar, and then pouring grout material into the sleeve joint and the space defined by the mortar. And

The hoop-shaped reinforcing bars arranged so as to surround the projecting portions of the column reinforcing bars are injected from the outside of the columns into the gap between the columns and the floor slab. The mortar is injected into the space defined by the hoop reinforcing bars. The opening of the sleeve joint is prevented from being blocked by the mortar. As a result, the remaining portion of the gap and the sleeve joint are reliably filled with the grout material, and there is no possibility of forming a void in the gap and the sleeve joint due to the injection of the grout material.

According to the present invention, after the hoop-shaped reinforcing bars are arranged on the slab in such a state that the protruding portion of the column reinforcing bars is inside the space defined by the hoop-shaped reinforcing bars, the hoop-shaped reinforcing bars are placed between the upper surface of the slab and the lower surface of the pillar. Since the mortar is arranged in the gap from the side around the hoop-shaped reinforcing bar, there is no possibility that the opening of the sleeve joint is blocked by the mortar.

[0008]

1 to 3, a concrete floor slab 10 is provided with a plurality of pillar rebars 12 on the lower floor, one end of which projects upward from the upper surface of the slab 10. On the other hand, the precast concrete pillar 14 includes a plurality of pillar rebars 16 extending in the vertical direction, and a plurality of sleeve joints 18 individually connected to the lower ends of the pillar rebars 16. The sleeve joints 18 individually correspond to the column rebars 12 on the slab 10 side, and are opened on the lower surface of the column 14 so as to receive the protrusions of the corresponding column rebars 12. Pillar 1
A plurality of holes 20 communicating with the sleeve joints 18 from the outer peripheral surface of the pillar 14 are formed in the column 4.

When connecting the post 14 to the slab 10, as shown in FIG.
As shown in FIG. 2, the slab 1 is formed so that the hoop-shaped reinforcing bar 22 surrounds the protruding portion of the column reinforcing bar 12 on the slab 10 side.
0, and a plurality of spacers 24 for adjusting a gap between the slab 10 and the pillar 14 are arranged on the slab 10 in a space defined by the hoop-shaped reinforcing bar 22.

The hoop-shaped reinforcing bar 22 is, as shown in FIG.
The protrusion of the column reinforcing bar 12 from the slab 10 is the hoop-shaped reinforcing bar 2.
Slab 1 so that it is inside the space defined by 2
It is arranged at a distance from the column rebar 12 on the 0 side. In the illustrated example, the hoop-shaped reinforcing bar 22 has a circular cross-sectional shape, but may have another cross-sectional shape such as a quadrangle. Each spacer 24 has a plate shape, and has a thickness dimension slightly larger than the height dimension (diameter dimension in the illustrated example) of the hoop-shaped reinforcing bar 22.

Next, as shown in FIGS. 4 and 5, the pillar 14 is erected on the slab 10 with the protruding portion of the pillar rebar 12 received in the sleeve joint 18. As a result, the pillar 14 is arranged such that the opening of each sleeve joint 18 is within the space defined by the hoop-shaped reinforcing bar 22. In addition, a gap of a predetermined size is maintained by the spacer 24 between the slab 10 and the pillar 14.

Next, as shown in FIG. 6, the mortar 26
However, in the gap between the upper surface of the slab 10 and the lower surface of the column 14, the hoop-shaped reinforcing bar 2 is provided at a portion outside the hoop-shaped reinforcing bar 22.
Placed from the side around 2. The mortar may be arranged on the outside of the hoop-shaped reinforcing bar 22 by pushing the mortar 26 into the gap between the slab 10 and the column 14 with a trowel or the like.

When the mortar 26 is placed outside the hoop-shaped reinforcing bar 22, the hoop-shaped reinforcing bar 22 prevents the mortar 26 from moving into the space defined by the hoop-shaped reinforcing bar 22. Therefore, there is no possibility that the opening of each sleeve joint 18 is blocked by the mortar.

Then, as shown in FIG. 6, the hose 28 is connected to the optional hole 20 of the optional sleeve joint 18, and the grout material 28 is connected from the hose 30 to the hole 20.
Is injected into the rest of the gap and all sleeve joints 18 via. As a result, the pillar 14 is connected to the slab 10 by the grout material 28, and the pillar rebar 12 on the slab 10 side is connected to the pillar rebar 16 on the pillar 14 side via the grout material 28 and the sleeve joint 18.

When the grout material 28 is injected, the hose 3
The hole 20 that is not connected to 0 is closed by the plug 32 because the grout material is pushed out from the hole 20.
As a result, the remaining portion of the gap and all the sleeve joints 18 are surely filled with the grout material 28, so that there is no possibility that voids due to the grout material not being filled are formed in the gaps and the sleeve joint 18. .

According to the above method, after the hoop-shaped reinforcing bar 22 is arranged on the slab 10 in a state where the protruding portion of the column reinforcing bar 12 is inside the space defined by the hoop-shaped reinforcing bar 22,
Since the mortar 26 is arranged in the gap between the upper surface of the slab 10 and the lower surface of the column 14 from the side around the hoop-shaped reinforcing bar 22, there is no risk that the opening of the sleeve joint 18 is blocked by the mortar 26, and therefore the grout material is used. 28 reliably fills the remainder of the gap and the sleeve joint, and there is no risk of voids being formed in the remainder of the gap and in the sleeve joint 18 due to the grout material 28 not being injected.

In addition to the hoop-shaped reinforcing bar, a spacer 24
If the column 14 is arranged, it is possible to maintain the column 14 in the correct vertical state by the spacer 24. However, when the column 14 is maintained in the correct vertical state by performing predetermined processing on the upper surface of the slab 10 or the lower surface of the column 14. Does not need to use the spacer 24.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a column building portion on the upper surface of a slab.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a cross-sectional view showing a state in which a pillar is built on a slab.

FIG. 4 is a cross-sectional view showing a state where columns are built on a slab.

5 is a cross-sectional view showing a part of FIG.

FIG. 6 is a cross-sectional view showing a state after completion of connection.

[Explanation of symbols]

 10 Slabs 12 Slab-side column rebars 14 columns 16 Column-side column rebars 18 Sleeve joints 20 holes 22 Hoop-shaped rebars 24 Spacers 26 Mortar 28 Grout materials 30 Hoses 32 Plugs

Claims (1)

[Claims] 1. A method of connecting a precast concrete column having a plurality of sleeve joints at its lower end to a plurality of column reinforcing bars of a lower floor projecting above a concrete slab, the method comprising: A hoop-shaped rebar is arranged on the slab so as to surround the outer periphery, and the column is built on the slab in a state where the protrusion of the column rebar is received by the sleeve joint, and the upper surface of the slab. In the gap between the lower surface of the column, mortar is arranged at a portion outside the hoop-shaped reinforcing bar from the side around the hoop-shaped reinforcing bar, and then a grout material is defined by the sleeve joint and the mortar. A method of connecting concrete columns to a slab, including pouring into the space.