JP7175215B2 - Method of joining precast concrete columns - Google Patents

Description

The present invention provides a method for joining precast concrete columns, which can secure the filling rate of grout material even for precast concrete columns having a large cross section.

2. Description of the Related Art In recent years, in the construction of a building or the like, a construction method has been widely used in which building members such as walls and columns are pre-produced as precast concrete members in a factory, and then brought to the site and assembled. By adopting such a construction method, it became possible to reduce the number of man-hours on site and shorten the construction period.

For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-164688), precast concrete beams having formwork forming portions on both end sides of the upper surface of a concrete member are installed between each column, and these precast concrete beams A reinforced concrete structure characterized by laying a precast concrete floor plate having a formwork forming part on the upper surface of the concrete plate between the concrete plates, and pouring concrete into the joint formwork formed by the formwork forming part. construction method is disclosed.
JP-A-2001-164688

Construction projects are currently getting larger, and there is a trend towards an increase in super high-rise buildings. As a result, the cross-section of each member has become larger, and we are now in a situation where precast concrete with a large cross-section, which has not been used so far, is being used.

In precast concrete columns, a common method is to provide mechanical joints of reinforcing bars at the base of the column and simultaneously apply grout to the joint portion and the joint portion of the column base. However, when the cross section of the column becomes large, there is a problem that the grout material may not be filled at a desired filling rate. In particular, when the construction period is summer, when the grout material tends to harden, it is expected that it will become even more difficult to perform construction with an appropriate grout filling rate.

The present invention is intended to solve the above-described problems, and a method for joining a precast concrete column according to the present invention joins a precast concrete column to a slab, in which a plurality of sleeve-type reinforcing-bar joint members are inserted. A method for joining precast concrete columns, comprising the steps of disposing the precast concrete column with a joint space between it and the slab, disposing a separation member in the joint space, and separating the joint space with the separation member. , a step of forming a plurality of divided joint spaces, a step of filling and curing one divided joint space with grout via a sleeve type reinforcing bar joint member, and after curing of the grout filled in the one divided joint space is completed , a step of removing a separating member disposed between said one divided joint space and another divided joint space adjacent to said divided joint space, and filling said other divided joint space with grout via a sleeve type reinforcing bar joint member for curing. and a step of performing.

In addition, a method for joining precast concrete columns according to the present invention is a method for joining a precast concrete column, in which a plurality of sleeve-type reinforcing-bar joint members are inserted, onto a slab, wherein providing a joint space and arranging the precast concrete column; placing a separating member in the joint space, separating the joint space with the separating member to form a plurality of divided joint spaces; A step of filling the space with grout via a sleeve-type reinforcing bar joint member and curing, and a step of filling and curing the other divided joint space adjacent to the one divided joint space with grout via the sleeve-type reinforcing bar joint member. , After curing of the grout filled in the one divided joint space and the grout filled in the other divided joint space is completed, it is arranged between the other divided joint space adjacent to the one divided joint space and a step of filling and curing grout in a space formed after removing the spacing member.

A method for joining a precast concrete column according to the present invention is a method for joining a precast concrete column having a plurality of sleeve-type reinforcing-bar joint members inserted therein onto a slab, wherein the precast concrete column is a step of disposing a separation member to separate the joint space and to form a plurality of divided joint spaces at a planned location to be a joint space between the slab and the precast concrete column; and A step of disposing the precast concrete column with a joint space therebetween, a step of filling and curing the one divided joint space with grout via a sleeve type reinforcing bar joint member, and another adjacent to the one divided joint space and a step of filling and curing the grout into the divided joint space through the sleeve type reinforcing bar joint member.

A method for joining precast concrete columns according to the present invention includes a step of disposing a separation member in a joint space, separating the joint space with the separation member to form a plurality of divided joint spaces, and filling and curing each of the joint spaces with grout material. According to the method for joining precast concrete columns according to the present invention, even a precast concrete column with a large cross section is divided into divided joint spaces having appropriate areas and then filled with grout material. , a sufficient grout filling rate can be secured, and highly reliable construction can be performed.

It is a transparent schematic diagram explaining the joining method of a precast concrete column. It is a transparent schematic diagram explaining the joining method of a precast concrete column. It is a transparent schematic diagram explaining the joining method of a precast concrete column. It is a transparent schematic diagram explaining the joining method of a precast concrete column. It is a figure explaining the joining method of the precast concrete column which concerns on 1st Embodiment of this invention. It is a figure explaining the joining method of the precast concrete column which concerns on 1st Embodiment of this invention. It is a figure explaining the joining method of the precast concrete column which concerns on 1st Embodiment of this invention. It is a figure explaining the joining method of the precast-concrete column which concerns on 2nd Embodiment of this invention. It is a figure explaining the joining method of the precast-concrete column which concerns on 2nd Embodiment of this invention. It is a figure explaining the joining method of the precast-concrete column which concerns on 2nd Embodiment of this invention. It is a figure explaining the joining method of the precast-concrete column which concerns on 3rd Embodiment of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, FIGS. 1 to 4 are schematic diagrams in which the precast concrete column 10 and the slab 30 are seen transparently, in order, in each process of the precast concrete column joining method.

A plurality of column side column main reinforcements 13 are embedded in the precast concrete column 10 so as to extend in the vertical direction. Further, reinforcing bars that connect the column side column main reinforcements 13 are provided in a portion not shown in the figure in a direction perpendicular to the plurality of column side column main reinforcements 13 .

A lower end portion of each column side column main reinforcement 13 is inserted into a sleeve type reinforcing bar joint member 20 corresponding to each column side column main reinforcement 13 . A plurality of sleeve-type rebar joint members 20 are also embedded within the precast concrete column 10 . The sleeve-type reinforcing-bar joint member 20 has an open lower end and a closed upper end with concrete material.

Further, the inner space of each of the plurality of sleeve type reinforcing bar joint members 20 communicates with the lower end opening 15 on the lower side and communicates with the upper end opening 17 on the upper side. The lower end opening 15 and the upper end opening 17 are openings provided on the surface of the precast concrete column 10, and grout material is injected through these openings, or surplus grout material at the time of filling is discharged. It's becoming

On the other hand, a plurality of slab side column main reinforcements 33 are also embedded in the slab 30 to which the precast concrete column 10 is joined. The upper end sides of these slab side column main reinforcements 33 are exposed from the slab 30 . In addition, reinforcing bars that connect the slab side pillar main reinforcements 33 are provided in a direction perpendicular to the plurality of slab side pillar main reinforcements 33 at locations not shown.

In this embodiment, the precast concrete column 10 is joined to the slab 30, but the slab 30 also includes the precast concrete column. The method for joining precast concrete columns according to the present invention can also be used for joining precast concrete columns 10 to each other.

FIG. 1 shows a state in which a precast concrete column 10 is suspended by suspension means (not shown). The precast concrete column 10 suspended by the suspension means is lowered and placed on the slab 30 so that the joint space 40 remains. A spacer (not shown) placed on the slab 30 is used to form the joint space 40 .

When the precast concrete column 10 is installed on the slab 30 with the joint space 40 formed, the lower end corresponding to one of the plurality of sleeve type rebar joint members 20 is subsequently installed as shown in FIG. An injection nozzle 49 for injecting grout material is attached to the opening 15 .

Formwork 43 is provided around the joint space 40 formed between the upper surface of the slab 30 and the bottom surface of the precast concrete column 10 to prevent the grout material from overflowing from the joint space 40. ing. This completes the preparation for injection of the grout material 50 .

Subsequently, a pump (not shown) is driven to inject the grout material 50 from the injection nozzle 49 into the sleeve-type reinforcing-bar joint member 20 as shown in FIG. The grout material 50 overflowing from the bottom of the sleeve type reinforcing bar joint member 20 fills the joint space 40, and when the entire joint space 40 is filled, the other sleeve type reinforcing bar joint member 20 is filled from below. . When the grout material 50 is discharged from all of the lower end opening 15 and the upper end opening 17 corresponding to the sleeve type reinforcing bar joint member 20, the joint space 40 and all internal spaces of the sleeve type reinforcing bar joint member 20 are filled with the grout material 50. When this is confirmed, the driving of the pump (not shown) is stopped, and the filling of the grout material 50 is completed.

Thereafter, the grout material 50 is cured, and when the curing is completed, the formwork 43 surrounding the joint space 40 is removed, and the slab 30 and the precast concrete column 10 are joined together as shown in FIG. According to such a joining method, both the joint space 40 and the joint portion between the main bars (sleeve-type reinforcing bar joint member 20) can be joined at the same time.

Conventionally, the above-described joining method for precast concrete columns has been basically adopted, but in recent years, the cross-sectional area of precast concrete columns tends to increase, and in the conventional joining method, the grout material is desired. There was a problem that it may not be filled at the filling rate. Therefore, in the present invention, a joining method as described below is adopted.

5 to 7 are diagrams illustrating a method for joining precast concrete columns according to the first embodiment of the present invention. 5A is a transparent plan view of the precast concrete column 10, and FIG. 5B is a side view of the slab 30 and the precast concrete column 10. FIG. 5 to 7, the injection nozzle 49 and the like explained in FIGS. 1 to 4 are omitted from illustration, and the explanation of the processes related thereto is also omitted.

The precast concrete column 10 shown in FIG. 5 has a relatively large cross section. The joint space 40 is divided after the precast concrete column 10 is placed, leaving the joint space 40 between the slab 30 and the slab 30 .

Specifically, an air tube formwork 100 is arranged as a separation member in the joint space 40, and the joint space 40 is separated by the air tube formwork 100 (separation member) to form a plurality of divided joint spaces. In the present embodiment, an example in which the joint space 40 is divided into two spaces, ie, divided joint spaces 40a and 40b, by the air tube formwork 100 (separating member) will be described. The number of divided joint spaces is arbitrary.

In addition, as described above, before the air tube formwork 100 is placed as a separating member in the joint space 40, if a release agent is applied to the air tube formwork 100, it can be removed from the grout material after curing. is preferred because it facilitates The air tube formwork 100 used to separate the joint spaces 40 is attached densely and firmly to the extent that the grout material does not move to the non-target split joint space due to the pressure of the injected grout material.

The air tube mold 100 arranged in the joint space 40 is an air mold having a hose-like portion that expands when air is introduced by a compressor (not shown). Since the air tube formwork 100 expands and contracts by introducing and discharging air, it has the advantage that it can be easily set and demolded. However, in the method for joining precast concrete columns according to the present invention, the separation member is not only an air tube formwork 100 such as Gap Guard (registered trademark), but also a small diameter air fence, a formwork made of polyethylene foam (for example, Esafoam (registered trademark, etc.), hard-kneaded grout, square timber, angle steel, and the like can also be used.

Now, after dividing the joint space 40 into the two divided joint spaces 40a and 40b by the air tube formwork 100 as described above, preparations are made to fill one of the divided joint spaces with the grout material 50. FIG. In the example shown in FIG. 5, preparations are being made to fill the split joint space 40a with the grout material 50, and a formwork 43 is attached around the split joint space 40a.

After the formwork 43 is attached as shown in FIG. 5, the grout material 50 is subsequently injected from one of the plurality of sleeve type reinforcing bar joint members 20 as described in the examples of FIGS. 1 to 4. , the split joint space 40a, and all the sleeve-type reinforcing-bar joint members 20 communicating with the split joint space 40a are filled with the grout material 50. As shown in FIG. The state shown in FIG. 6 is obtained by performing the step of injecting the grout material 50 . The grout material 50 is thus filled and cured.

In the grouting material injection, the grouting material 50 may be injected from one of the plurality of sleeve-type reinforcing-bar joint members 20. More preferably, the sleeve-type grouting material 50 near the corners of the rectangular split joint space in plan view It is preferable to select one of the reinforcing bar joint members. Specifically, referring to FIG. 5(A), it is preferable to select a sleeve-type reinforcing-bar joint member for grout material 50 from (p), (q), (r), and (s). Selecting a sleeved rebar joint member closer to the corner will result in a more even distribution of the grout material 50 .

When curing of the grout material 50 filled in the divided joint space 40a is completed, the next step is performed. In the subsequent step, the air tube formwork 100 disposed between the joint division space 40a and another joint division space 40b adjacent to it is removed, and the formwork 43 surrounding the joint division space 40a is also removed. . When removing the air tube formwork 100, workability is improved if the introduced air is discharged and contracted before this is done.

Furthermore, a formwork 43 is attached around the side of 40b, which is another divided joint space. Subsequently, the grout material 50 is injected from one of the plurality of sleeve-type reinforcing-bar joint members 20 communicating with the divided joint space 40b. Again, one of the sleeve-type reinforcing-bar joint members near the corners of the divided joint space 40b, which is rectangular in plan view, is selected.

When the split joint space 40b and all the sleeve-type reinforcing-bar joint members 20 communicating with the split joint space 40b are filled with the grout material 50, the state shown in FIG. 7 is obtained. Subsequently, curing of the grout material 50 is performed. When the curing of the grout material 50 is completed, the formwork 43 is removed, and each step in the method for joining precast concrete columns according to the present invention is completed.

As described above, in the method for joining precast concrete columns according to the present invention, the separation member (air tube formwork 100) is placed in the joint space 40, and the joint space 40 is separated by the separation member (air tube formwork 100). , a plurality of divided joint spaces, each of which is filled with grout material 50 and cured. According to the method for joining precast concrete columns according to the present invention, a precast concrete column with a large cross section Even in 10, since the grout material 50 is filled after being divided into divided joint spaces with an appropriate area, a sufficient grout filling rate can be secured and highly reliable construction can be performed.

Next, another embodiment according to the present invention will be described. In the first embodiment described above, the joint space 40 is separated by the separation member (the air tube formwork 100) to form two divided joint spaces 40a and 40b, and the grout material is filled in each of the divided joint spaces step by step. , I was trying to take care of myself. On the other hand, in the second embodiment, after the joint space 40 is separated by the separation member (the air tube formwork 100) to form two divided joint spaces 40a and 40b, grout is applied to each of the divided joint spaces substantially simultaneously. It is filled with material and cured. A method for joining precast concrete columns according to the second embodiment will be described below with reference to FIGS. 8 to 10 .

8A is a transparent plan view of the precast concrete column 10, and FIG. 8B is a side view of the slab 30 and the precast concrete column 10. FIG. 8 to 10, the injection nozzle 49 and the like explained in FIGS. 1 to 4 are omitted from illustration, and the explanation of the processes related thereto is also omitted.

The precast concrete column 10 shown in FIG. 8 has a relatively large cross section. The joint space 40 is divided after the precast concrete column 10 is placed, leaving the joint space 40 between the slab 30 and the slab 30 .

Specifically, two air tube forms 100 are arranged as separating members in the joint space 40, and the joint space 40 is separated by the two air tube forms 100 (separating members) to form a plurality of divided joint spaces. do. In this embodiment, an example in which the joint space 40 is divided into two divided joint spaces 40a and 40b by two air tube forms 100 (separating members) will be described. It is arbitrary how many divided joint spaces are separated from each other.

Also in the present embodiment, it is preferable to apply a mold release agent to the air tube form 100 before disposing the air tube form 100 as a separating member in the joint space 40 . In addition, as the separation member arranged in the joint space 40, in addition to an air formwork such as the air tube formwork 100 (for example, Gap Guard (registered trademark), etc.) or a small-diameter air fence, a polyethylene foam formwork (for example, , Esafoam (registered trademark), etc.), hard grout, square timber, angle steel, and the like can also be used.

After the two air tube forms 100 divide the joint space 40 into two split joint spaces 40a, 40b, preparations are made to fill both split joint spaces with the grout material 50. As shown in FIG. The example shown in FIG. 8 shows preparations for filling both the divided joint space 40a and the divided joint space 40b with the grout material 50, and around both the divided joint space 40a and the divided joint space 40b. A formwork 43 is attached.

After the formwork 43 is attached as shown in FIG. 8, the grout material 50 is injected from one of the sleeve-type reinforcing-bar joint members 20 corresponding to the split joint space 40a, and almost simultaneously into the split joint space 40b. Grout material 50 is injected from one of the corresponding sleeved rebar joint members 20 . As a result, the split joint spaces 40a, 40b and all the sleeve-type reinforcing-bar joint members 20 communicating with them are filled with the grout material 50. As shown in FIG. As in the previous embodiment, the sleeve-type reinforcing-bar joint member 20 selected as the injection port for the grout material 50 is one of the sleeve-type reinforcing-bar joint members near the corners of the rectangular split joint space in plan view. to select.

As described above, the state shown in FIG. 9 is obtained by performing the step of injecting the grout material 50 . The grout material 50 is thus filled and cured.

When curing of the grout material 50 filled in the divided joint space 40a and the divided joint space 40b is completed, the next step is performed. In the subsequent step, the two air tube forms 100 arranged between the divided joint space 40a and the other divided joint space 40b adjacent thereto are pulled out and removed, and the divided joint space 40a is removed. , the formwork 43 surrounding the split joint space 40b is also removed.

Here, in this embodiment, the reason why two air tube forms 100 are used when dividing the joint space 40 into two divided joint spaces 40a and 40b will be described.

A tip portion 110 of the air tube formwork 100 is formed by caulking. Therefore, the width of the tip 110 is greater than the width of the hose-like portion filled with air. Suppose that the split joint spaces 40a and 40b are formed using only one air tube formwork 100, and the grout material 50 is filled, cured, and solidified in both split joint spaces, and then the air in the air tube formwork 100 Even if an attempt is made to extract the air tube formwork 100 by discharging the air tube formwork 100, the solidified grout material 50 is hit by the tip portion 110, making it difficult to pull out the single air tube formwork 100.例文帳に追加Therefore, in the present embodiment, the space created after the grout material 50 is solidified using the two air tube molds 100 is widened so that the air tube molds 100 can be easily pulled out. .

After the grout material 50 is filled and solidified in the divided joint spaces 40a and 40b as described above, the two air tube forms 100 are pulled out. Subsequently, a step of filling the grout material 50 into the space (40c in FIG. 10) between the divided joint space 40a and the divided joint space 40b formed after the two air tube forms 100 are pulled out is performed. be done. For this preparation, as shown in FIG. 10, forms 43 that act as weirs when the entire space 40c is filled with the grout material 50 are provided at both end openings of the space 40c. After such a formwork 43 is provided, the space 40c is filled with the grout material 50 and cured. The grout material 50 overflowing from the both end openings of the space 40c and solidified is removed with a cutter or the like.

As described above, in the method for joining precast concrete columns according to the second embodiment, the separation member (air tube formwork 100) is arranged in the joint space 40, and the joint space 40 is formed by the separation member (air tube formwork 100). A plurality of divided joint spaces are separated from each other, and grout material 50 is filled and cured in each divided joint space almost at the same time.

According to the method for joining precast concrete columns according to the second embodiment, even a precast concrete column 10 having a large cross section is divided into divided joint spaces having appropriate areas and then filled with the grout material 50. A sufficient grout filling rate can be secured, and highly reliable construction can be performed. Furthermore, according to the method for joining precast concrete columns according to the second embodiment, the grout material 50 is filled and cured in the divided joint spaces at approximately the same time, so the time required for the main steps can be shortened. can.

Next, another embodiment according to the present invention will be described. In the embodiments so far, a separating member such as the air tube formwork 100 has been used to separate the joint spaces 40 and form the divided joint spaces. On the other hand, in the method for joining precast concrete columns according to the third embodiment, a hard-kneaded grout material is used as a separating member, and the joint space 40 is separated by the separating member to form a divided joint space.

Hereinafter, a method for joining precast concrete columns according to the third embodiment will be described with reference to FIG. 11 . FIG. 11 shows a state in which the precast concrete column 10 is suspended by suspension means (not shown). The precast concrete column 10 suspended by the suspension means is lowered and placed on the slab 30 so that the joint space 40 remains. In the embodiment, the preliminarily kneaded preceding grout material 150 is provided at a location to be a joint space.

It is desirable that the volume of the leading grout material 150 is slightly larger than the volume of the air tube formwork 100 that functions as the separating member. Further, when the preceding grout material 150 is arranged, its height is set higher than the height of the joint space 40.例文帳に追加Also, the location where the preceding grout material 150 is arranged is the same as the location where the air tube formwork 100 is arranged in the first embodiment.

The precast concrete column 10 is lowered from the state shown in FIG. 11 and placed on the slab 30 so that the joint space 40 remains. When the precast concrete column 10 is placed, the bottom surface of the precast concrete column 10 and the upper portion of the preceding grout material 150 are crushed due to the relationship between the amount and height of the preceding grout material 150 . Thereby, the joint space 40 is separated by the leading grout material 150 to form two divided joint spaces. After the preceding grout material 150 is solidified, the two divided joint spaces are filled with the grout material 50 and cured at substantially the same time as in the second embodiment. According to this, even in the method for joining precast concrete columns according to the third embodiment, the time required for the main steps can be shortened.

As described above, the method for joining precast concrete columns according to the present invention includes the steps of disposing a separating member in a joint space, separating the joint space with the separating member to form a plurality of divided joint spaces, and filling and curing each of the divided joint spaces with a grout material. According to the method for joining precast concrete columns according to the present invention, even a precast concrete column with a large cross section can be divided into divided joint spaces having appropriate areas and then filled with grout material. Therefore, a sufficient grout filling rate can be secured, and highly reliable construction can be performed.

Reference Signs List 10 Precast concrete column 13 Column side column main reinforcement 15 Bottom end opening 17 Top end opening 20 Sleeve type reinforcing bar joint member 30 Slab 33 Slab side column main reinforcement 40 ... joint space 40a, 40b ... divided joint space 40c ... (divided joint) space 43 ... formwork 49 ... injection nozzle 50 ... grout material 100 ... air tube formwork ( separation member)
110... Tip part 150... Leading grout material (separating member)

Claims (3)

A precast concrete column joining method for joining a precast concrete column in which a plurality of sleeve type reinforcing bar joint members are inserted onto a slab, comprising:
providing a joint space between the slab and arranging the precast concrete column;
a step of disposing a separation member in the joint space and separating the joint space with the separation member to form a plurality of divided joint spaces;
A step of filling and curing grout in one divided joint space via a sleeve type reinforcing bar joint member;
After the curing of the grout filled in the one divided joint space is completed, a step of removing the separating member disposed between the one divided joint space and another divided joint space adjacent to the one divided joint space;
a step of filling the other divided joint space with grout through a sleeve-type reinforcing bar joint member and curing the grout;
A method for joining precast concrete columns, comprising: A precast concrete column joining method for joining a precast concrete column in which a plurality of sleeve type reinforcing bar joint members are inserted onto a slab, comprising:
providing a joint space between the slab and arranging the precast concrete column;
a step of disposing a separation member in the joint space and separating the joint space with the separation member to form a plurality of divided joint spaces;
A step of filling and curing grout in one divided joint space via a sleeve type reinforcing bar joint member;
a step of filling and curing grout into another divided joint space adjacent to the one divided joint space via a sleeve type reinforcing bar joint member;
After curing of the grout filled in the one divided joint space and the grout filled in the other divided joint space is completed, it is arranged between the other divided joint space adjacent to the one divided joint space. removing the separating member;
a step of filling and curing grout in the space formed after removing the spacing member;
A method for joining precast concrete columns, comprising: A precast concrete column joining method for joining a precast concrete column in which a plurality of sleeve type reinforcing bar joint members are inserted onto a slab, comprising:
arranging a separation member to separate the joint space and to form a plurality of divided joint spaces in a portion where the precast concrete column is arranged to form a joint space between the slab and the precast concrete column; ,
providing a joint space between the slab and arranging the precast concrete column;
A step of filling and curing grout in one divided joint space via a sleeve type reinforcing bar joint member;
a step of filling and curing grout into another divided joint space adjacent to the one divided joint space via a sleeve type reinforcing bar joint member;
A method for joining precast concrete columns, comprising:

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