JP3113158B2 - Precast concrete column members - Google Patents

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 injected, on a lower surface of a column main portion.

[0002]

2. Description of the Related Art In general, a column member made of precast concrete of this kind includes a pillar main portion made of concrete and a plurality of pillars mostly embedded in the column main portion and partially projecting upward from the column main portion. It includes a main bar, a plurality of hoop bars buried in the column main portion at intervals in the vertical direction, and a plurality of sleeve joints in the column main portion each of which receives the lower end of the column main bar. The pillar main portion has a cotter, that is, a concave portion into which a grout material for bonding is injected, in the center of the lower surface.

[0003] 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 projecting upward from the floor slab is received in a sleeve joint. The pillar member is built into the floor slab, a formwork for closing the gap between the pillar member and the floor slab is arranged around the lower end of the pillar main body, and the grout material is removed from at least one sleeve joint by the pillar member. Between the floor slab and the recess,
And by being injected into each sleeve joint, it is joined to the floor slab. Thus, 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 part of the air in the recess cannot escape to the outside when the grout material for bonding is injected. Injection of the grout material into the place becomes incomplete, and a void is formed in the upper part of the recess. When such a gap is formed,
The connection between the column and the floor is incomplete, and sufficient joint strength cannot be obtained. The above-mentioned gap is often formed particularly in a pillar member used as a middle pillar that does not have a pillar main bar at the center.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to allow grout material to be injected entirely into a recess in the lower surface of a column member.

[0006]

The precast concrete member according to the present invention has at least one groove in the lower surface of the column main portion, which connects the recess on the lower surface of the column main portion to the side of the column main portion. The recess is formed in a rectangular shape inside a virtual loop connecting the main pillars in plan view, and the groove has a depth dimension of the recess over the entire length thereof. It is characterized in that it has the above-described depth dimension and is opened at the concave portion corresponding to the corner of the square.

[0007] 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. For this reason, the grout material is injected into the entire recess, and there is no possibility that a void remains 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 portion to the side of the pillar main portion is provided on the lower surface of the pillar main portion, the air in the recess flows into the recess. As the grout material is injected, the grout material is extruded through the groove to the outside of the column main portion, and the grout material is injected into the entire recess in the lower surface of the column member.

Preferably, the groove is opened to the lower surface of the column main body. Thereby, the groove itself also functions to maintain the positional relationship between the column and the floor slab.

[0010]

Referring to FIGS. 1 and 2, a precast concrete column member 10 includes a quadrangular column-shaped column main portion 12 made of concrete, and a column main portion 12 extending vertically in the column main portion 12. And a plurality of pillar main bars 14 projecting further upward from the pillar main body 1 at intervals in the vertical direction.
2 and a plurality of hoop streaks 16 embedded in
2 is a precast reinforced concrete column member including a plurality of sleeve joints 18 each of which receives a lower end of the column main bar 14.

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

The pillar main portion 12 includes a joining cotter or recess 22 and a plurality of air vent grooves 24 for connecting the recess 22 to the outside of the pillar main portion 12, that is, to the side. To have. The recess 22 is formed at 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 inside an imaginary loop connecting the pillar main bars 14 in plan view. 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 a depth equal to or greater than the depth of the recess 22 over the entire length thereof.

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

The column member 10 includes a column member 10 and a floor slab 26.
One or more spacers 3 to maintain a gap 30 between
2 are arranged on the floor slab 26, and the column members 10 are erected on the floor slab 26 with the protrusions of the main bars 28 of the columns received in the sleeve joints 18, and the gaps 30 between the column members 10 and the floor slab 26 are formed. A closing formwork 34 is arranged around the lower end of the pillar body 12 and a high-strength cement-like grout is removed from at least one passage 20 through the corresponding sleeve joint 1.
8 to assemble into the floor slab 26.

The grout material is provided in at least one passage 20.
Are injected into the gaps 30, recesses 22, grooves 24, sleeve joints 18, and 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 released through the groove 24 and the sleeve joint 18 and the passage. The air in the recess 22 is pushed out of the pillar main body 12 through the groove 20 and the gap 3
0, it is pushed out of the pillar main body 12 through the sleeve joint 18 and the passage 20. For this reason, the grout material is provided in each passage 20, recess 22, each groove 24, each sleeve joint 18,
And the gap 30 is filled.

When the grout material is injected to the level of the passage 20 which is not used as an inlet for the grout material, a part of the grout material flows out of the passage 20 and a predetermined amount of the grout material communicates with the passage 20. It means that it was injected into the sleeve joint 18. For this reason, the passage 20 not used as the grout injection port is closed by the cap 36 after a part of the grout flows out.

When all the passages 20 not used as the grout inlet are closed by the cap 36, the passages 20 used as the grout inlet are also closed by the cap 36. As a result, the grout material is removed from the gap 3
0, recesses 22, grooves 24, sleeve joints 18, and passages 20 are filled. Column member 10 and floor slab 26
Means that the above state is maintained until the injected grout material is solidified.

The upper and lower column main reinforcements 14 and 28 are the sleeve joint 1
8, connected by the grout material solidified in the
The floor grout and the floor slab 26 are integrally joined by solidification of the injected grout material. Column member 10 and floor slab 2
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 concave portion 22 is filled with the grout material and the gap between the column main body 12 and the mold 34 is slightly reduced from the groove 24. Is pushed out of the pillar main body 12 through
The grout material is filled to every corner in the recess 22, and a gap not filled with the grout material is not formed in the upper corner of the recess 22, and the column 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 does not communicate with the outside of the column main body 12.
Air remains in the upper corners of the recess 22, thereby forming voids in the upper corners of the recess 22 that are not filled with grout material,
The connection between the column member and the floor slab becomes incomplete, and the joint strength between the column member and the floor slab becomes an insufficient value.

If a plurality of grooves 24 are formed from the recess 22 to different portions on the outer surface of the column main body 12 as in the illustrated embodiment, grout material is injected from any of the sleeve joints 18 into the gap 30. However, the air without the recess 22 is
2 is securely pushed out of the pillar main body 12 and the recess 22
There is no danger of voids remaining inside.

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

[Brief description of the drawings]

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

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

[Explanation of symbols]

 DESCRIPTION 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 vent passage 22 Depression 24 Groove 26 Floor slab

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tomoaki Tsujimura 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Co., Ltd. Kumagaya Gumi Tokyo headquarters (56) References JP-A-6-57819 (JP, A) JP-A-5-179758 (JP, A) JP-A-6-733893 (JP, A) JP-A-4-203148 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1 / 21 E04C 3/00-3/46 E04G 21/12 105

Claims (1)

(57) [Claims] 1. A precast concrete column member having a recess into which a grout material is injected on a lower surface of a column main portion, wherein at least one groove communicating the recess with a side of the column main portion is formed in the column. The concave portion is formed on the lower surface of the main body portion, and the concave portion is formed in a rectangular shape inside a virtual loop connecting the main pillars in plan view, and the groove is formed over the entire length direction thereof. A precast concrete column member having a depth dimension equal to or greater than the depth dimension of the recess, and being opened at a site of the recess corresponding to a corner of the square.