JP2574996Y2 - Column main bar holding member - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding member for a column main bar, and more specifically, positions and holds a column main bar disposed in an internal space of a precast concrete column centrifugally formed into a square hollow cylindrical body. The present invention relates to a holding member for a column main bar for use.

[0002]

2. Description of the Related Art Generally, a pillar of a reinforced concrete structure is provided with a pillar reinforcement, and a hoop is wound around the pillar reinforcement.
After constructing a wooden formwork, placing concrete in this formwork, and removing the formwork, the construction is performed by removing the formwork.The positioning of the column main reinforcement in the formwork is based on the hoop wrapped around the column main reinforcement. They do this by attaching donut-shaped spacers to the muscles. However, such formwork is complicated and takes a long time, and it is difficult to stably construct a homogeneous and high-quality reinforced concrete column.

Therefore, in recent years, a precolumn method using a hollow cylindrical precast concrete column has been developed as a means of saving labor, shortening the construction period, and improving the quality of construction work of a reinforced concrete column. The precast concrete column in this precolumn method is disclosed in
As shown in JP-A-8011, a centrifugal concrete forming machine is formed by attaching a formwork having a rectangular cross section and rotating. In this form, a donut-shaped spacer is fitted and hoop streaks arranged at an appropriate distance from the inner wall surface of the form are arranged. In addition, four rods each having a right-angled triangular cross section are inserted in advance into the mold, and the rods fit into corners of the mold by centrifugal force when rotated. And when concrete is put inside while rotating this formwork, the concrete is agglomerated by centrifugal force.
A square pillar with a substantially cylindrical space is formed on the inside by centrifugal force, and a cutout is formed in the part where the four corner rods were extracted to insert the main bar when inserting this precast concrete pillar Is done.

[0004] In the pre-column method for the precast concrete column thus formed, as shown in Fig. 4, a space between the inner surface of the precast concrete column after being erected and the main bar of the column inserted into the internal space is provided. Is designed to cast and fill concrete with a predetermined clearance, and the value of this clearance is a dimension that must be accurately maintained in structural calculation and construction.

[0005]

[Problems to be Solved by the Invention] In the precolumn method described above, since the hoop bars are driven into the inside of the precast concrete columns, the main bars of the columns are suspended in the space inside the precast concrete columns. I have. Therefore, a special guide for determining the planar position of the main column in the internal space is required in order to smoothly perform the concrete filling and filling.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to hold a column main bar which can determine and hold a planar position of a column main bar inserted and arranged in an internal space of a precast concrete column. It is to provide a member.

[0007]

In order to achieve the above object, the holding member of the main column of the present invention is engaged with the head of a precast concrete column which is formed into a rectangular hollow cylindrical shape by centrifugal molding, and is mounted on the head thereof. And a holding member of a column main bar that positions and holds a plurality of column main bars inserted and arranged in the internal space of the precast concrete column, and is composed of four side members fixedly formed in a cross-girder shape, Both ends of each sap are bent into a crank shape to engage with the upper end surface of the precast concrete column, and an intermediate portion of each sap is dropped into the internal space of the precast concrete column, and The present invention is characterized in that each column main bar arranged at a predetermined clearance from the peripheral surface is in contact with and held by a main bar.

[0008]

The precast concrete column is erected from above the main bar, and the holding member of the main bar, which is fixedly formed in a girder shape at the head, is dropped from above and mounted. At this time, the key portions at both ends of the spar of the girder-shaped holding member are engaged with the upper end surface of the head of the precast concrete column to prevent its falling off, and the intermediate portion of each sap is precast. It is dropped into the internal space of a concrete pillar, and comes into contact with each pillar main bar inserted and arranged with a predetermined clearance from the inner surface. Each column main bar is bound to each sap bar, so that its planar position is determined and held.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a holding member of a pillar main bar according to the present invention, FIG. 2 is a plan view thereof, FIG.
FIG. 4 is an arrow view taken along the line IV-IV shown in FIG. 3, and FIG. 5 is a perspective view showing a state where the holding member is mounted on the head of the precast concrete column.

[0011] A holding member 10 of a column main bar shown in FIG. 1 has four sap members 11, formed of a steel bar or a plastic material.
As shown in FIG. 2, the cross portions 12 and 12 are fixed to each other by welding, and are formed by welding. As shown in FIG. 4, each sap 11 is formed in the shape of a crank which is bent upward and bent outward again, as shown in FIG. In addition, the middle part 1 of each of these four sapwood 11
The length L1 of the precast concrete column 20 is shorter than the distance between the inner peripheral surfaces of the precast concrete columns 20, and the length L2 up to both ends 13 is shorter than the distance between the outer peripheral surfaces of the precast concrete columns 20.

According to the dimensions of the precast concrete column 20 to which the column main reinforcing bar is to be mounted, such a retaining member 10 of the column main reinforcing bar is provided in advance so that each side of the retaining member 10 comes into contact with a plurality of column main reinforcing bars 30 designated by structural design. The members 11 are fixedly formed by combining and welding the members 11 in a grid pattern.

The holding metal fitting 10 thus configured is attached to the head of the precast concrete column 20 when the column is built. That is, the column main bars 30, 3 projecting from the lower layer
After the column main reinforcements 30, 30,... Are further inserted from above into the notches 21 of the precast concrete column 20 built from the top of 0,. The holding member 10 is dropped from above and mounted. Then, since the end 13 of the spar 11 in a cross-girder shape is formed in a crank shape, the end 13 abuts and engages with the upper end surface 22 of the precast concrete column 20, thereby holding the holding member 1 dropped.
0 is prevented from falling into the precast concrete column 20.

The precast concrete column 20
The intermediate portion of each sap 11 dropped into the inside of the precast concrete column 20 comes into contact with the column main reinforcing bars 30, 30,. I do. Thereby, the column main reinforcement 30, when the precast concrete column 20 is built,
The planar position of 30,... Is easily determined. After that, the intersections of the holding members 10 and the column main reinforcements 30, 30,.
Is securely held.

In this embodiment, the column main bar 30 is in contact with the outside of the holding member 10 and is bound.
The sap material 11 of the holding member 10 may be fixed by welding so as to be inside.

[0016]

[Effects of the Invention] As described above, according to the holding member of the main bar of the present invention, a precast concrete column centrifugally formed into a square hollow cylindrical body is erected from above the main bar of the column, and concrete is filled therein. When constructing a reinforced concrete column, when installing the precast concrete column, simply drop the holding member on the head of the precast concrete column and attach it, and easily fix the column main bar to the correct planar position and hold it It can also be diverted and has a large economic effect.

[Brief description of the drawings]

FIG. 1 is a perspective view of a holding member of a pillar main bar according to the present invention.

FIG. 2 is a plan view of the holding member shown in FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is an arrow view taken along a line IV-IV shown in FIG. 3;

FIG. 5 is a perspective view showing a state in which a holding member is mounted on the head of a precast concrete column.

FIG. 6 is a top view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Holding member of column main reinforcement 11 Sapwood 13 End part 14 Intermediate part 20 Precast concrete column 30 Column main reinforcement

Continuing on the front page (72) Inventor Toru Ohno 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo head office (56) References Really open 60-60117951 (JP, U) Really open 60-6025 (JP, U) Japanese Utility Model 6-20664 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04G 21/12 105

Claims (1)

(57) [Scope of request for utility model registration] 1. A precast concrete column formed by centrifugal molding into a rectangular hollow cylindrical body, which is engaged and mounted on the head of the precast concrete column after installation, and positions a plurality of column main reinforcements to be inserted and arranged in the internal space of the precast concrete column. This is a holding member of the main bar of the pillar, which is composed of four sap bars which are assembled and fixed in a cross-girder shape, and both ends of each sap bar are bent and formed in a crank shape, and are formed on the precast concrete column. While engaging with the end face, the intermediate portion of each sap is dropped into the internal space of the precast concrete column, and contacts and holds the main bar of each column arranged with a predetermined clearance from the inner peripheral surface. A member for holding a column main bar.