JPH08105118A - Precast concrete column member - Google Patents

Abstract

PURPOSE: To fill a grounting material in the whole recessed place to connect a column member and a floor slab with a sufficient strength, by connecting the recessed part at the underface of the column member to the side of column body through grooves. CONSTITUTION: A recess 22 in which a grouting material is injected is provided at the underface of the column body 12 of a precast concrete column member 10. And a groove 24 connecting the recess 22 to the side of the column body 12 is provided at the underface of the column body 12. When the column member 10 is assembled with the floor slab 26 and a grouting material is injected, the air within the recess 22 is pushed out through the clearance 30, the groove 24, the sleeve joints 18, and air passages 20, to the outside of the column body 12. Accordingly, the grouting material is filled in respective air passages 20, the recess 22, grooves 24 sleeve joints 18, and the clearance 30 and hence the column member 10 is connected to the slab 26 at a sufficient strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column member made of precast concrete having a recess into which a grout material is poured, on the lower surface of the column main body.

[0002]

2. Description of the Related Art A column member made of precast concrete of this type is generally composed of a concrete pillar main body and a plurality of pillars which are mostly embedded in the pillar main body and partially project upward from the pillar main body. It includes a main bar, a plurality of hoop bars embedded in the column main body at intervals in the vertical direction, and a plurality of sleeve joints in the column main part that respectively receive the lower ends of the column main bars. The column main body has a cotter, that is, a recess, in the center of the lower surface, into which the grout material for joining is injected.

In such a column member, a spacer for maintaining a gap between the floor slab and the column member is arranged on the floor slab, and each column main bar protruding upward from the floor slab is received in the sleeve joint. A column member is built in the floor slab, and a formwork for closing the gap between the column member and the floor slab is arranged around the lower end of the column main body, and the grout material is formed from at least one sleeve joint to the column member. Between the floor and the floor slab,
And to the floor slab by pouring into each sleeve joint. Thereby, the pillar and the floor slab are integrally joined by the grout material, and the positional relationship between the pillar and the floor slab is maintained by the grout material injected into the recess.

However, in this type of column member, since the recess only opens downward, a portion of the air in the recess cannot escape to the outside when the grout material for joining is injected, resulting in the recess. The pouring of the grout material into the place becomes incomplete, and a void is formed above the recess. When such a void is formed,
The connection between the pillar and the floor is incomplete and sufficient joint strength cannot be obtained. In particular, the voids as described above are often formed in a pillar member used as an intermediate pillar without a pillar main bar in the central portion.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to allow grout material to be injected into the entire recess of the lower surface of the column member.

[0006]

The precast concrete member according to the present invention has at least one groove on the lower surface of the pillar main body for communicating the recess on the lower surface of the concrete pillar main body to the side of the pillar main body. Is characterized by.

The air in the recess is pushed out of the column main body through the groove as the grout material is injected into the recess. Therefore, the grout material is injected into the entire recess, and there is no risk of leaving voids in the recess, and the pillar and the floor are joined with sufficient strength.

According to the present invention, since at least one groove for communicating the recess on the lower surface of the pillar main body to the side of the pillar main body is provided on the lower surface of the pillar main body, the air in the recess is directed to the recess. Along with the pouring of the grout material, the grout material is extruded through the groove to the outside of the pillar main body, and the grout material is poured into the entire recess of the lower surface of the pillar member.

It is preferable that the groove is opened to the lower surface of the column main body. As a result, the groove itself also acts to maintain the positional relationship between the pillar and the floor slab.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a precast concrete pillar member 10 is a pillar main body portion 12 formed of concrete and having a rectangular prism shape, and a pillar main body portion 12 extending vertically in the pillar main body portion 12. A plurality of pillar main bars 14 protruding further upward from the pillar main body portion 1 at intervals in the vertical direction.
2 and a plurality of hoop muscles 16 embedded in the column main body 1
2 is a precast reinforced concrete column member that includes a plurality of sleeve joints 18 that each receive the lower end of the column main bar 14 in 2.

Most of the column main bars 14 are embedded in the column main body portion 12, and a part of each column main bar 14 projects upward from the column main body portion 12. Each sleeve joint 18 has a pillar main body 1
It is arranged in the lower part of 2 so as to extend in the vertical direction, and opens downward. Each sleeve joint 18 is communicated with the column main body 12 around or laterally by a plurality of air vent holes or passages 20.

The pillar main body 12 has a cotter or recess 22 for joining and a plurality of air vent grooves 24 for communicating the recess 22 to the outside or side of the pillar main body 12 and the lower surface of the pillar main body 12. Have. The recess 22 is formed in the center of the lower surface of the pillar main body 12 and opens below the pillar main body 12.

The recess 22 is formed virtually inside the loop connecting the column main bars 14 when viewed two-dimensionally. Each groove 24
Extends continuously from the recess 22 to the side surface of the column main body 12 and opens downward. Each groove 24 has substantially the same depth dimension as the recess 22 or more over its entire length.

The floor slab 26 on which the pillar member 10 is built has the same number of pillar main bars 28 as the pillar main bars 14 of the pillar member 10. Each pillar main bar 28 extends from the pillar on the lower floor, and the upper end thereof projects upward from the floor slab 26. The floor slab 26 may be the floor itself or a part of the lower pillar.

The pillar member 10 includes a pillar member 10 and a floor slab 26.
One or more spacers 3 for maintaining a gap 30 between
2 is arranged in the floor slab 26, the pillar member 10 is built in the floor slab 26 in a state where the protrusions of the respective column main bars 28 are received in the sleeve joint 18, and a gap 30 between the pillar member 10 and the floor slab 26 is provided. A closing mold 34 is arranged around the lower end of the pillar body 12 and a high strength cement-like grout material is provided from at least one passage 20 to the corresponding sleeve fitting 1.
8 to be assembled to the floor slab 26.

The grout material has at least one passage 20.
From the gap 30, the recess 22, the grooves 24, the sleeve joints 18, and the other passages 20. With the injection of the grout material, the air in each sleeve joint 18 is pushed out of the column main body 12 through the corresponding passage 20, and the air in the gap 30 is also passed through the groove 24 and the sleeve joint 18 and the passage. The air in the recess 22 is pushed out of the column main body 12 through the groove 20 and the gap 3 is formed through the groove 24.
0, the sleeve joint 18 and the passage 20 are pushed out of the column main body 12. Therefore, the grout material includes the passages 20, the recesses 22, the grooves 24, the sleeve joints 18,
And the gap 30 is filled.

When the grout material is injected to the height position of the passage 20 which is not used as an inlet for the grout material, a part of the grout material flows out from the passage 20 and a predetermined amount of the grout material communicates with the passage 20. It means that it has been injected into the sleeve joint 18. Therefore, the passage 20 that is not used as an inlet for the grout material is closed by the cap 36 after a part of the grout material flows out.

When all the passages 20 not used as the grout material inlet are closed by the cap 36, the passages 20 used as the grout material inlet are also closed by the cap 36. As a result, the grout material becomes
0, the recess 22, the grooves 24, the sleeve joints 18, and the passages 20. Column member 10 and floor slab 26
The above state is maintained until the injected grout material is solidified.

The upper and lower column main bars 14 and 28 are sleeve joints 1.
The column members 10 are connected by the grout material solidified in
The floor slab 26 and the floor slab 26 are integrally joined by solidification of the injected grout material. Column member 10 and floor slab 2
The positional relationship with 6 is maintained by the grout material solidified in the recess 22.

According to the column member 10 having the groove 24 as described above, the air in the recess 22 is injected into the grout material, and a slight gap is formed between the groove 24 and the column main body 12 and the mold 34. Since it is pushed out of the pillar main body 12 through
The grout material fills every corner of the recess 22, and voids that are not filled with grout material are not formed in the upper corners of the recess 22, and the pillar member 10 and the floor slab 26 are joined with sufficient strength.

On the other hand, if the groove 24 is not formed, the recess 22 is not communicated with the outside of the column main body 12,
Air remains in the upper corner of the recess 22, thereby forming a void in the upper corner of the recess 22 that is not filled with grout material,
The connection between the pillar member and the floor slab becomes incomplete, and the joint strength between the pillar member and the floor slab becomes an insufficient value.

As in the illustrated embodiment, by forming a plurality of grooves 24 extending from the recess 22 to different parts of the outer surface of the column main body 12, the grout material is injected into the gap 30 from any of the sleeve joints 18. However, the air in the recess 22 is not in the recess 2
2 is surely pushed out of the pillar main body portion 12, and the recess 22
There is no risk of voids remaining inside.

The present invention is not limited to the above embodiment. For example, as long as the bottom surface of the groove 24 does not have a step, the depth dimension of the portion on the side of the recess 22 is substantially the same as or greater than the depth dimension of the recess 22, and the groove 24 of The outer surface may have a bottom surface that is inclined such that the depth dimension of the recess 22 side is smaller or larger than the depth dimension of the recess 22.

[Brief description of drawings]

FIG. 1 is a bottom view showing an embodiment of a precast concrete pillar member of the present invention.

2 is a cross-sectional view taken along line 2-2 of FIG.

[Explanation of symbols]

 10 Precast Concrete Column Member 12 Column Main Part 14 Column Main Bar of Column Member 16 Hoop Bar 18 Sleeve Joint 20 Air Venting Channel 22 Recess 24 Groove 26 Floor Slab

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoaki Tsujimura 2-1, Tsukudocho, Shinjuku-ku, Tokyo Kumagai Gumi Tokyo Head Office

Claims (1)

[Claims] 1. A precast concrete pillar member having a recess into which a grout material is injected, on the lower surface of a pillar main body, wherein at least one groove for communicating the recess to the side of the pillar main body is provided. A precast concrete pillar member that is provided on the lower surface of the main body.