JP3504305B2 - Precast pillar joining method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a precast column and a main bar projecting upward from a slab surface.

[0002]

2. Description of the Related Art A conventional joining method of this type is known, for example, from JP-A-4-52815. This joining method will be described with reference to FIGS. 5A and 5B. Reference numeral 1 is a precast column (hereinafter abbreviated as a column) having a square cross section, and a large number of joint sleeves 2 (in the inside thereof). Only a few coupling sleeves 2 are shown,
Illustration of the other joint sleeves 2 is omitted. )
Are arranged along the outer peripheral surface of the pillar 1. The lower end of the joint sleeve 2 is open to the lower end surface of the column 1. On the other hand, the main bar 3 is fixed to the upper end of the joint sleeve 2 by means such as screwing and a nut 4.

A main bar 5 is fixed to a concrete slab (hereinafter abbreviated as slab) 4 to which the pillar 1 is joined, with its upper end protruding from the upper surface of the slab 4. The respective main bars 5 are arranged corresponding to the positions of the respective joint sleeves 2 so as to fit into the respective joint sleeves 2.

When the pillar 1 is joined to the slab 4, the pillar 1 is placed on the upper surface of the slab 4 via a plurality of spacers 6. At this time, the main bar 5 is inserted into each joint sleeve 2. By mounting the pillar 1 on the slab 4 via the spacer 5, a gap 7 is formed between the slab 4 and the pillar 1. The gap 7 is formed by a mold 8 arranged along the outer circumference of the pillar 1.
Seal with.

Next, a large number of injection holes 8 formed in the mold 8
Inject the mortar material from a. The injected mortar material is filled in the gap 7 and at the same time as the joint sleeve 2
It enters and is filled inside. Then, the pillar 1 is joined to the slab 4 by solidifying the filled mortar material. The joint sleeve 2 is formed with a discharge hole 2a communicating with the outer surface of the column 1, and the air inside the gap 7 and the joint sleeve 2 is discharged to the outside through the discharge hole 2a. Further, the joint sleeve 2 is formed with an injection hole 2b at a lower end portion thereof. The injection hole 2b is used for filling the mortar material when the joint sleeve 2 is unitarily joined. In the example joining method, the mortar material is closed before or during the injection.

[0006]

In the above-mentioned conventional joining method, a large air pool 9 is generated in the central portion of the gap 7 facing the lower surface of the column 1, and as a result, the joining strength may be reduced. Then, when the cause of generation of the air pocket 9 was sought, it was found that the cause was that the mortar material was injected from a large number of injection holes 8a.

The reason for this will be described with reference to FIG. 4. Now, for convenience of explanation, it is assumed that the mortar material 10 is injected into the gap 7 from the four corners of the mold 8. The mortar material 10 injected from each corner into the gap 7 spreads concentrically, and
As shown by the solid line in FIG. As a result, an air pool 9 is formed in the center of the gap 7. At the beginning of the formation of the air pocket 9,
The contact portion between the mortar materials 10 is close to each side of the column 1 and faces the joint sleeve 2 arranged therein. Therefore, the air in the air reservoir 9 is discharged from the joint sleeve 2.

However, when the mortar material 2 is further injected, as shown by the imaginary line in FIG. 4, the contact portion between the mortar materials moves to the central portion side of the column 1. Then, since the joint sleeve 2 is not arranged on the central portion side of the pillar 1 but only on the peripheral portion thereof, the air reservoir 9 is separated from the joint sleeve 2 and the air in the air reservoir 9 is separated from the joint sleeve 2. It is no longer discharged from the sleeve 2. As a result, the air reservoir 9 may remain in the center of the gap 7.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 (hereinafter referred to as the first invention) has a plurality of joint sleeves opening at the lower end surface along the outer peripheral surface. When joining a precast column having a quadrangular cross-section provided with a plurality of main bars projecting upward from the slab surface, the precast column is above the slab surface, and in the precast cross-sectional shape between them. Correspondingly
A square shaped gap is created, and the main bars are placed in the joint sleeve respectively.The gap is sealed with a formwork arranged along the outer peripheral surface of the precast column, and the mortar material is injected into the gap. Thus, in the method of joining the precast column in which the gap and the inside of the joint sleeve are filled with the mortar material, an injection hole is formed in one corner of the mold, and the mortar material is introduced from the injection hole into the clearance. By injecting the mortar material into the gap so as to concentrically spread from the one corner to other corners diagonally located with respect to the one corner. It is characterized in that the mortar material is sequentially filled from the one corner side to the other corner side.

The invention according to claim 2 (hereinafter, referred to as the second
Invention. ), When joining a plurality of joint sleeves having a square cross section provided along the outer peripheral surface with a plurality of joint sleeves opening at the lower end surface and a plurality of main bars protruding upward from the slab surface, Above the slab surface, between them the cross section of the precast columns
A quadrangular gap corresponding to the shape is formed, and the main sleeves are arranged in the joint sleeve respectively, and the gap is sealed with a mold arranged along the outer peripheral surface of the precast column outside the precast column. Injecting mortar material into the gap to join the mortar material into the gap and the inside of the joint sleeve, in a method for joining precast columns, precasting to one joint sleeve arranged at one corner of the precast column. An injection hole communicating with the outer surface of the pillar was formed, and a mortar material was injected from the injection hole into the gap through a joint sleeve having the injection hole, and the mortar material was arranged in the corner in the gap. by spread concentrically to other corners located diagonally with respect to the corner portion around the joint, the gap and the joint Mortar material is characterized by sequentially filled from the one corner side to the other corner portion side in the sleeve.

[0011]

In the first aspect of the invention, the mortar material injected from the injection hole of the mold spreads concentrically around one corner of the mold, and goes to the other corner located diagonally to one corner. And proceed. As a result, the mortar material is concentrically filled inside the gap, and the mortar material is sequentially filled from the joint sleeve located on one corner side to the joint sleeve located on the other corner side. The air in the gap is discharged to the outside from the joint sleeve that is not filled with the mortar material and is pushed to the other corner side. At the other corner, the gap and the air in the joint sleeve are discharged from the joint sleeve located at the corner.

The second invention is similar to the first invention, except that the mortar material is injected from the injection hole of the joint sleeve located at one corner of the column instead of the injection hole of the mold. The gap and each joint sleeve are filled with the mortar material, and the air in the gap is discharged to the outside.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. In the following examples,
Only the parts different from the above-mentioned conventional example will be described, the same parts are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 shows an embodiment of the joining method according to the first aspect of the invention. In this embodiment, injection is performed only in one corner of the mold 8 (upper left corner in FIG. 1B). Hole 8
b is formed, and the injection hole is not formed in other portions. Note that a hole 8c is also formed at one corner where the injection hole 8b is formed and at another corner located on the diagonal line (the lower right corner in FIG. 1B). There is no exhaust hole.

When the pillar 1 is joined to the slab 4, the mortar material is injected through the injection hole 8b. Then, as shown in FIG. 3, the mortar material 10 spreads concentrically around the one corner where the injection hole 8b is formed. As a result, the mortar material 10 is concentrically filled inside the gap 7 and also filled inside the joint sleeve 2 located midway. The fact that the joint sleeve 2 is filled with the mortar material 10 can be understood by discharging the mortar material 10 from the discharge hole 2a of the joint sleeve 2. Mortar material 10
The discharge hole 2a of the joint sleeve 22 filled with is closed by a plug (not shown).

In this way, the mortar material 10 has the gap 7
And while the joint sleeve 2 is being filled, it advances toward one corner and the other corner diagonally located. At this time, the air inside the gap 7 is discharged from the discharge hole 2a of the joint sleeve 2 which is not filled with the mortar material and is pushed to the other corner side. Therefore, no air pocket is formed in the center of the gap 7. At the other corner, the gap 7 and the air in the joint sleeve 2 are discharged from the joint sleeve 2 located at the corner. Therefore, air pockets do not occur in other corners. In particular, in this embodiment, since the exhaust hole 8c is formed in the other corner of the mold 8 and the air in the gap 7 is exhausted also from this exhaust hole 8c, an air pocket is generated. Can be prevented more reliably.

Next, the second invention will be described. In the second invention, the injection hole for the mortar material is usually formed in the joint sleeve in consideration of the case where the joint sleeve is used alone. When the mortar material is injected into the gap, only the injection hole of the joint sleeve located at one corner of the column is used.

An embodiment of such a joining method according to the second invention will be described with reference to FIG. 2. In this embodiment, one corner of the pillar 1 (upper left corner in FIG. 2B) is used.
Only the injection hole 2b of the joint sleeve 2 located at the position is communicated with the outer surface of the column 1, and the mortar material is injected through this injection hole 2b.

Although the injection hole is not formed in the other joint sleeve 2 in this embodiment, a joint sleeve having the injection hole may be used. Of course, the injection hole may be closed before the filling of the mortar material or may be closed during the filling of the mortar material.

When the mortar material is injected from the injection hole 2b of the joint sleeve 2 located at one corner of the column 1, the mortar material is filled inside the joint sleeve 2 and
From the lower end opening of the joint sleeve 2 enters the gap 7,
It is concentrically spread in the gap 7 around the joint sleeve 2. Therefore, similarly to the first aspect, it is possible to prevent a large air pocket from being formed in the central portion of the gap 2. Further, since the injection hole 2b formed in the joint sleeve 2 is used, it is not necessary to form the injection hole in the form 8, and the labor of processing can be reduced accordingly.

The present invention is not limited to the above-described embodiments, but can be modified as appropriate without departing from the spirit of the invention. For example, in the above example,
Although the lower end surface of the joint sleeve 2 is aligned with the lower end surface of the column 1, the lower end surface of the joint sleeve 2 may be located above the lower end surface of the column 1. In that case, a hole that is the same as or larger than the inner diameter of the joint sleeve 2 is formed in the lower end surface of the column 1.

Further, in the embodiment according to the second aspect of the invention, as shown by the imaginary line in FIG.
The exhaust hole 8 is provided at one corner of the mold 8 adjacent to the joint sleeve 2 having b and at another corner diagonally located with this corner.
You may form d respectively. By doing so, it is possible to more reliably prevent the occurrence of air traps in the gap 7.

[0023]

As described above, according to the method for joining precast columns of the present invention, the injection holes are formed at one corner of the mold or the joint sleeves are formed at one corner of the precast column. Since the mortar material is injected into the gap only through the injection hole, it is possible to prevent the formation of a large air pool in the center of the gap, which has the effect of improving the bonding strength. To be

[Brief description of drawings]

FIG. 1 shows an embodiment of the first invention.
1A is a cross-sectional view taken along the line AA of FIG.
1B is a cross-sectional view taken along the line BB of FIG.

2 shows an embodiment of the second invention, and FIG.
2A is a sectional view taken along the line AA of FIG.
2B is a cross-sectional view taken along the line BB of FIG.

FIG. 3 is a diagram for explaining the operation of the first invention.

FIG. 4 is a diagram for explaining a problem that a conventional joining method has.

FIG. 5 shows an example of a conventional joining method.
5A is a cross-sectional view taken along the line AA of FIG.
5B is a sectional view taken along the line BB of FIG.

[Explanation of symbols]

1 precast pillar 2 joint sleeve 2b injection hole 4 slabs 5 main lines 7 gap 8 formwork 8b injection hole

Claims (2)

(57) [Claims] 1. A precast column having a plurality of joint sleeves each having an opening at a lower end surface and provided along an outer peripheral surface and having a rectangular cross section, and a plurality of main bars projecting upward from a slab surface are joined together. Columns above the slab surface, with the cross-sectional shape of the precast columns between them.
Corresponding quadrangular gaps are created, and the main sleeves are placed in the joint sleeves respectively, and the gaps are sealed with a formwork arranged along the outer peripheral surface of the precast column, and the mortar material is placed in the gaps. By injecting
In a method of joining a precast column in which the gap and the inside of the joint sleeve are filled with a mortar material, an injection hole is formed at one corner of the mold, and the mortar material is injected from the injection hole into the clearance. , By spreading the mortar material concentrically in the gap to the other corners located diagonally with respect to the one corner, the mortar material in the gap and the joint sleeve features and to pulp Rekyasuto column joining method that sequentially filled from one corner side to the other corner portion side. 2. A precast column having a rectangular cross-section provided with a plurality of joint sleeves opening at the lower end surface along the outer peripheral surface and a plurality of main bars projecting upward from the slab surface when the precast column is joined. Columns above the slab surface, with the cross-sectional shape of the precast columns between them.
Corresponding quadrangular gaps are created, and the main reinforcements are placed in the joint sleeves respectively, and the gaps are sealed with a formwork arranged along the outer peripheral surface of the precast columns along the outer peripheral surface of the precast columns. By injecting a mortar material, in the method of joining the precast column, wherein the gap and the inside of the joint sleeve are filled with the mortar material, in one joint sleeve arranged at one corner of the precast column, the precast column An injection hole communicating with the outer surface is formed, and a mortar material is injected from the injection hole into the gap through a joint sleeve having the injection hole, and the mortar material is inserted into the gap to form a joint arranged at the one corner. By concentrically spreading to the other corner located diagonally with respect to this one corner as the center, A method for joining precast columns, characterized in that the mortar material is sequentially filled from the one corner side to the other corner side in the tube.