JPH06257218A - Frame mounting structure of post/beam joint - Google Patents

Abstract

PURPOSE:To enhance workability of posts which use a precast concrete cylindrical body and reduce construction period for mounting work of post/beam joint frames to the precast concrete cylindrical body in particular. CONSTITUTION:A separator and a form tie 14 are used to mount a post/beam joint frame 6 to the upper part of the precast concrete cylindrical body 3 described above. More specifically, more specifically, the separator is preliminarily inserted into an insertion hole formed on the upper part of the precast concrete cylindrical body 3 to mount a suspending hardware. In addition, there is laid out a sheathing board 6b of the post/beam joint frame 6 on the outer surface of the concrete cylindrical body 3. The end of the separator is inserted through the sheathing board 6b. The sheathing board 6b of the post/beam frame 6 is fixed with the precast concrete cylindrical body 3 by screwing the form tie 14 into the end of the separator projected from the sheathing board 6b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete column constructed by arranging main columns of a column and placing concrete in a precast concrete cylinder, and constructing them by integrating them. The present invention relates to a post-beam joint part frame mounting structure for mounting a mold part of the joint part to the reinforced concrete column when constructing a joint part with a beam.

[0002]

2. Description of the Related Art The formwork method, which is known as one of the methods for constructing reinforced concrete columns, involves assembling a formwork so as to surround a column reinforcement that has already been assembled on the site where the column should be constructed. Concrete is poured into the frame, and after the cast concrete hardens, the formwork is removed to construct a reinforced concrete column.

However, in a reinforced concrete column constructed by this formwork method, chickenpox marks and bubble pox marks are unavoidably formed on the surface (exposed surface) of the column after the formwork is removed, so In addition to the inconvenience that the finished state is not good and the condition of the column cannot be confirmed until the form is removed, in most cases, the surface of the column needs to be repaired. In addition, even if the repair work is performed, the traces thereof often remain, and the surface of the pillar on which the repair work is performed has particularly poor durability, so that surface peeling may occur over time. Also, in the case of reinforced concrete columns constructed by the formwork method, it takes time and effort to dismantle the formwork, and recently, since the weir plate used as the formwork is made of wood, it is one of the problems of global resources. Some examples can be found.

For this reason, in recent years, a tubular precast concrete tubular body has been used as a so-called formwork as a concrete pouring formwork, and inside the precast concrete tubular body, a column composed of column main rebars and stirrups is used. A construction method has been developed in which reinforcing bars are arranged, concrete is poured, and the precast concrete cylinder used as a formwork is also configured as a final column.By this construction method, reinforced concrete columns have come to be constructed. There is.

FIG. 3 and FIG. 4 show an example of the case of constructing a reinforced concrete column by the above-mentioned construction method.
FIG. 3 shows a state in which the column reinforcing bars 2 including the column main reinforcements 2a and the stirrup reinforcements 2b have already been assembled at the place where the columns on the foundation slab 1 should be constructed. After this state, as shown in FIG. 4, the above-described square tubular precast concrete tubular body 3 is suspended from above the column rebar 2. In this case,
A hanging hardware 4 is attached to the upper part of the precast concrete cylindrical body 3, and a wire 5 for lifting is attached to the hanging hardware.

Next, concrete is placed in the precast concrete cylindrical body 3 that is suspended and installed to complete a reinforced concrete column. Further, although it is necessary to join the beam to the upper portion of the reinforced concrete column, there are the following methods for joining the beam to the reinforced concrete column as described above, for example.

First, as shown in FIG. 5, a column-beam joint part formwork (square formwork) 6 is attached to the upper portion of a reinforced concrete column using a precast concrete tubular body 3, and then a beam rebar (not shown) is attached. After arranging, a beam formwork (not shown) is built so as to surround the beam reinforcement and to be joined to the beam notch 6a of the column-beam joint formwork 6. The formwork 6 for the post-beam joint portion is formed in a square tubular shape so as to surround the upper portion of the precast concrete tubular body 3, and the notch portion 6a for the beam is formed on the upper portion thereof.

A beam is constructed by placing concrete inside the column-beam joint section form 6 and the beam form. Conventionally, when attaching the formwork 6 for the column-beam joint to the precast concrete cylinder 3, the insertion hole 7 provided in the upper portion of the precast concrete cylinder 3 shown in FIG. 6 has been used.

The insertion hole 7 is for attaching the hanging metal object 4, and the hanging metal object 4 is inserted into the insertion hole 7 of the precast concrete cylinder 3 as shown in FIG. It was attached to the precast concrete cylinder 3 by a bolt 8 inserted from the outside through a hanging metal 4, and a nut 9 screwed onto the bolt 8 from the inside of the precast concrete cylinder 3.

In the insertion hole 7 as described above, the formwork 6 for the column-beam joint portion is formed.
When mounting the concrete, first, when the concrete 10 is set and hardened inside the precast concrete cylindrical body 3 installed at the position where the pillar should be constructed, as shown in FIG.
A discard nut 9 (or a discard bolt) is embedded at the position of the insertion hole 7 inside the precast concrete cylinder 3. As shown in FIG. 7, the discard nut 9 is formed by placing concrete 10 in the precast concrete tubular body 3 in a state where the hanging hardware 4 is attached, and then removing the hanging metal 4 and the bolt 8 to remove the precast concrete. It is embedded in the cylindrical body 3.

Then, as shown in FIG. 8, a column-beam joint part form 6 is built up so as to surround the upper portion of the precast concrete cylinder 3, and the pier 1 is inserted from the outside of the column-beam joint part form 6.
1 and the column-beam joint part form 6 and penetrates the through hole 7
Insert the bolt and discard the bolt 12 and screw it into the nut 9,
Alternatively, by attaching the formwork 6 for the column-beam joint section and the pier 11 to a bolt that is embedded in the precast concrete cylinder 3 and has its tip protruding from the insertion hole 7, and tightening a nut from the outer surface side of the pier 11. The precast concrete tubular body 3 was fitted with the formwork 6 for the column-beam joint section.

[0012]

By the way, in the above-described conventional method of mounting the formwork 6 for the column-beam joint, the discard nut 9 or the discard bolt is applied to the concrete 10 cast in the precast concrete cylinder 3. Must be buried and fixed. Therefore, in order to install the formwork 6 for the beam-column joint part, after the precast concrete cylinder 3 is installed, the concrete 10 is placed in the precast concrete cylinder 3 at the position of the discard nut 9 or the discard bolt, that is, the precast concrete cylinder. It is necessary to drive up to the upper end of the body 3 and wait for the concrete 10 to harden until the discard nut 9 or the discard bolt is fixed to some extent.

The precast concrete cylinder 3
Generally, a hopper is used to pour concrete inside, and it takes time to pour concrete by hopper piling. From the above, the pillar / beam joint part formwork 6 is attached to the installed precast concrete tubular body 3 after the concrete placing work by hopper driving, and the pillar / beam joint part formwork 6 is mounted. It takes a lot of time before that, which is a factor of extending the construction time of the pillar using the precast concrete cylinder 3.

The present invention has been made in view of the above problems, and it is possible to improve the workability at the time of attaching the formwork of the column-beam joint to the precast concrete cylinder and to shorten the construction period. It is an object of the present invention to provide a formwork mounting structure for a column / beam joint that can be formed.

[0015]

The formwork mounting structure of the column-beam joint of the present invention is a reinforced concrete column in which a main column bar is arranged in a precast concrete cylinder and concrete is cast. For attaching the formwork of the column-beam joint section, in the upper portion of the precast concrete cylinder, through holes are formed at positions facing each other, and on the outer surface side of the upper portion of the precast concrete cylinder. , A dam plate of the formwork of the column-beam joint is arranged so as to surround the precast concrete cylinder, and inside the precast concrete cylinder, rod-shaped members having screws formed at both ends are arranged, Further, both ends of the rod-shaped member are respectively inserted into the insertion holes formed at positions opposite to each other and on the outer surface side of the precast concrete tubular body. It is arranged so as to penetrate each of the placed weir plates and project to the outer surface side of the weir plate.Furthermore, the screws at both ends of the rod-shaped member are respectively fixed with fixing members from the outer surface side of the weir plate. The barrier plate is joined together and fastened to the precast concrete cylinder by the fixing member, which is a means for solving the above-mentioned problems.

[0016]

According to the above construction, the weir plate of the formwork of the column-beam joint is arranged so as to surround the outer surface of the precast concrete cylinder, and the rod-shaped member is passed through the weir plate and the precast concrete cylinder 2 formed at opposite positions
By inserting the two insertion holes, the both ends of the rod-shaped member are arranged so as to project to the outer surface of the weir plate, and the weir plate is formed by screwing the fixing members into the screws at both ends of the rod-shaped member. Since it is fastened to the precast concrete cylinder,
It is not necessary to place concrete in the precast concrete cylinder when installing the formwork for the column-beam joint. In addition, since the bolts and nuts are not used in fastening the formwork of the column-beam joint, it is not necessary to use a spanner matching the sizes of the bolts and nuts, and the workability is good.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the structure for mounting the formwork of the column / beam joint of the present invention will be described below with reference to FIGS. Figure 1
FIG. 2 is a drawing showing a state in which a formwork 6 for a column / beam joint portion is attached to a precast concrete cylindrical body 3, and FIG.

In this embodiment, the precast concrete tubular body 3 having a tubular shape is used as a so-called formwork as the above-mentioned concrete pouring formwork. Inside the precast concrete tubular body 3, the column main bar 2a is provided. Also, the precast concrete cylinder 3 used as a form is constructed by arranging the column rebars 2 including the strips 2b and placing concrete, and is also used in the construction method. Further, the same components as those of the above-mentioned conventional frame-frame joint structure mounting structure are designated by the same reference numerals, and a part of the description thereof will be omitted.

As shown in FIGS. 1 and 2, a precast concrete tubular body 3 is one in which four wall bodies (only one is shown in FIGS. 1 and 2) 3a are integrally formed in a rectangular tubular shape. And is installed on a foundation slab (not shown),
The column reinforcing bars 2 have already been arranged inside thereof. Also,
As shown in FIG. 6 used in the above-mentioned conventional example, two insertion holes 7, 7 for attaching hanging metal pieces are formed at the same height on the upper part of the wall 3a of the precast concrete cylinder 3. . Further, the insertion holes 7, 7 respectively provided in the wall bodies 3a facing each other are formed at positions facing each other.

The column-beam joint part mold 6 is used for the joint portion (joint part) between the pillar and the beam having the above-mentioned structure using the precast concrete cylinder 3, and the precast concrete cylinder is used. Four barrier plates 6b are formed in a rectangular tube shape so as to surround the four outer surfaces of the body 3 (in FIG. 1 and FIG. 2, only one barrier plate 6b is shown). The beam notch 6a is formed at the position where the column and the beam are joined. Two insertion holes (not shown) are formed in the lower part of the barrier plate 6b corresponding to the positions of the insertion holes 7 of the wall 3a of the precast concrete cylinder 3.

The four dam plates 6b of the formwork 6 for the column-beam joint section
Is the four walls 3a of the precast concrete cylinder 3.
The upper outer surface is arranged with the lower inner surface in contact with each other.
It is arranged so as to surround the formwork 6 for the column-beam joint portion. In addition, the barrier plate 6b includes an insertion hole (not shown) of the barrier plate 6b and the wall 3
The positions of the insertion holes 7 of a are arranged so as to communicate with each other.

As shown in FIG. 2, inside the precast concrete cylinder 3, the precast concrete cylinder 3 is
A separator (bar-shaped member, only one is shown in FIG. 2) 13 is arranged for each of a pair of insertion holes 7 facing each other. The separator 13 is a rebar-shaped member having male threads (not shown) formed on both ends thereof.

Both ends of the separator 13 are inserted into the pair of through holes 7 of the precast concrete cylinder 3 which are opposed to each other so as to project to the outer surface side of the precast concrete cylinder 3 and further to the weir plate 6b. It penetrates through an insertion hole (not shown) and projects to the outer surface side of the barrier plate 6b. A home tie (registered trademark) (fixing member) 14 is screwed to both ends of the separator 13 protruding to the outer surface side of the dam plate 6b to fasten the dam plate 6b to the precast concrete cylinder 3.

As shown in FIG. 2, the home tie 14 is formed in a columnar shape, and has an end face at one end.
A screw hole (not shown) that is screwed into the male screw of the separator 13 is formed, and a flange portion 14a for pressing the dam plate 6b toward the precast concrete cylinder 3 is formed at the end portion on the screw hole side. A wedge-shaped tightening member 14b is attached to the other end side so as to be vertically movable. The tightening member 14b is arranged with its pointed end facing downward. Then, the tightening member 14b is tightened by moving the tightening member 14b downward to press the member between the tightening member 14b and the precast concrete cylinder 3 toward the precast concrete cylinder 3 side. It is like this.

Then, the square steel pipes 15 and 1 are provided above and below the two home ties 14 for fixing the one dam plate 6b, respectively.
5 is passed over and is pressed against the precast concrete cylinder 3 side by the tightening member 14b, and these square steel pipes 15 and 15 clamp the dam plate 6b to the precast concrete cylinder 3 and the flange portion 14 of the home tie 14 is pressed.
Together with a, the dam plate 6b of the formwork 6 for the column-beam joint is fixed to the precast concrete cylinder 3.

By using the above-described structure for mounting the formwork of the column / beam joint,
In order to attach the post-beam joint part formwork 6 to the column using the precast concrete tubular body 3, first, on each of the opposing wall bodies 3a, 3a of the precast concrete tubular body 3,
The weir plates 6b, 6b of the formwork 6 for the column-beam joint portion are arranged, and the insertion hole 7 of the wall 3a and the insertion hole of the weir plate 6b (not shown).
Align the position of. In this state, the separator 13 is inserted through the insertion hole of the one weir plate 6b and the insertion hole of the wall body 3a, which are arranged at the opposite positions, and one end of the separator 13 and the insertion hole 7 of the other wall body 3a and the weir. The separators 13 are made to project from the insertion holes of the plate 6b, and both ends of the separator 13 are projected to the outer surface sides of the opposing dam plates 6b.

Alternatively, the separator 13 is inserted through the through holes 7, 7 facing each other in the precast concrete cylinder 3 so that both ends of the separator 13 project to the outer surface side of the precast concrete cylinder 3. Then, the position of the insertion hole of the dam plate 6b is aligned with the projected end portion of the separator 13, and the dam plate 6b is arranged so that the end portion of the separator 13 is inserted into this insertion hole.

Home ties 14 are screwed onto both ends of the separator 13 to form the precast concrete cylinder 3
The weir plate 6b is fastened to. Further, the square steel pipes 15 and 15 are respectively provided above and below the two home ties 14 and 14 projecting from the barrier plate 6b, and the square steel pipes 15 and 15 are provided.
The dam plate 6b is fixed to the precast concrete cylinder 3 by tightening 15 on the precast concrete cylinder 3 side with the tightening member 14b.

Further, the weir plates 6b and 6b are similarly attached to the walls 3a and 3a of the remaining precast concrete cylinders 3 which face each other, and the precast concrete cylinders 3 are provided with the formwork 6 for the column-beam joint section. Finish the installation.

As described in detail above, according to the formwork mounting structure for the column / beam joint of this embodiment, when the formwork 6 for the column / beam joint is attached to the precast concrete cylinder 3, the conventional It is not necessary that concrete is placed in the precast concrete cylinder 3 as described above. Therefore,
In a structure having a plurality of columns, it is possible to perform placing concrete in the precast concrete cylinder 3 and mounting work of the column-beam joint part formwork 6 in parallel. The construction period can be greatly shortened in the construction of the pillars.

Furthermore, the precast concrete cylinder 3
There is no need to use bolts and nuts as in the conventional method when attaching the column-beam joint section frame 6 to the column, and the separator and home tie used for building a general frame are used. There is no need to use a suitable tool such as a spanner, and since the separator and the home tie that are used by the workers who are building the formwork are used, the workability of installing the formwork 6 for the column-beam joint part is improved. Can be improved.

The separator and home tie used in the above embodiment are not limited to those shown in the drawings, and any known separator and home tie can be used without any particular problem.

[0033]

As described in detail above, according to the formwork mounting structure of the column-beam joint of the present invention, it is not necessary to pour concrete into the precast concrete cylinder in advance. When constructing a structure with multiple pillars using a cylinder, perform concrete pouring in the precast concrete cylinder and installation work of the column-beam joint part formwork on the precast concrete cylinder in parallel. Therefore, it is possible to significantly reduce the construction period of the pillar using the precast concrete cylinder.

Further, since the bolts and nuts are not used in fastening the formwork of the column-beam joint, it is not necessary to use a wrench suitable for the size of the bolts and nuts, and the workability can be improved. it can.

[Brief description of drawings]

FIG. 1 is a front view of a main portion showing a formwork for a column-beam joint portion attached to a precast concrete cylinder according to the embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a formwork mounting structure for a column / beam joint of the above-described embodiment.

FIG. 3 is a view for explaining an installation process of the precast concrete cylinder in the above conventional example.

FIG. 4 is a view for explaining a process of installing a precast concrete cylinder in the conventional example.

FIG. 5 is a front view of a main part showing a formwork for a beam-column joint part attached to a precast concrete cylindrical body in the conventional example.

FIG. 6 is a front view showing an insertion hole for attaching a hanging metal object of a precast concrete tubular body in the conventional example.

FIG. 7 is a cross-sectional view of an essential part showing a hanging hardware attachment structure in the conventional example.

FIG. 8 is a cross-sectional view of essential parts showing a formwork mounting structure of a column-beam joint section in the conventional example. .

[Explanation of symbols]

 3 Precast concrete cylinder 6 Formwork for post-beam joint (form of post-column joint) 6b Weir plate 7 Insertion hole 13 Separator (bar-shaped member) 14 Home tie (fixing member)

Claims (1)

[Claims] 1. A mold for a beam-column joint part for mounting a frame for a beam-column joint part to a reinforced concrete column in which a main column bar is arranged in a precast concrete cylinder and concrete is cast. In the frame mounting structure, a plurality of insertion holes are formed at positions facing each other in the upper part of the precast concrete cylinder, and the precast concrete cylinder is surrounded on the outer surface side of the upper part of the precast concrete cylinder. Thus, the weir plate of the formwork of the column-beam joint is arranged, inside the precast concrete cylinder, rod-shaped members each having a screw formed at both ends are arranged, and both ends of the rod-shaped member are arranged. Is the weir plate that is inserted through the insertion holes formed at the positions facing each other and that is arranged on the outer surface side of the precast concrete cylinder. It is arranged so as to penetrate therethrough and project to the outer surface side of the weir plate.Furthermore, the fixing members are screwed into the screws at both ends of the rod-shaped member from the outer surface side of the weir plate, respectively. A formwork mounting structure for a column-beam joint part, characterized in that it is fastened to the precast concrete cylinder by the fixing member.