JP2573355Y2 - 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 of the precast concrete column thus formed, as shown in Fig. 7, 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 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]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a precast concrete column which is engaged with a head of a precast concrete column which is formed into a rectangular hollow cylindrical shape by centrifugal molding, and which is mounted thereon. A plurality of pillar main bars that are positioned and held in the inner space of the main frame, the four main frames being fixed via bolt-shaped cross-shaped stopper fittings fastened to both ends thereof by bolts. Are connected to each other to form a spar shape that can be changed in size, and the intervals between the two sets of frames arranged in parallel are arranged with a predetermined clearance from the inner peripheral surface of the precast concrete column. The precast concrete is bent upward in the shape of a crank at the portion protruding outward from each of the stopper fittings at intervals between the column main reinforcements. Wherein the stopper portion is engaged with the upper end surface of the formed.

[0008]

[Function] A holding member of a column main reinforcement formed in a cross-girder shape is mounted on the head of a precast concrete column built from above the column main reinforcement by dropping from above. At this time, the holding member is configured such that the crank-shaped stoppers of the stoppers at both ends of the frame are engaged with the upper end surface of the head of the precast concrete column to prevent the precast concrete column from falling off, and each frame is formed in the internal space of the precast concrete column. It is dropped into the inside and is brought into contact with each of the column main bars inserted through a predetermined clearance from the inner surface thereof, and each column main bar has its planar position determined and held by each frame.

[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.
4 is a view taken along the line IV-IV shown in FIG. 3, FIG. 5 is a view taken along the line VV shown in FIG. 3, and FIG. 6 attaches the holding member to the head of the precast concrete column. It is a perspective view showing the state where it did.

As shown in FIGS. 1 to 6, the holding member 10 for the column main bar is made of a steel plate or a plastic material.
, And two end plates 1
And four stopper metal fittings 14,.. Each of the frames 11,... Is connected to each other through stoppers 14,... To form a girder, and is mounted on the head of the precast concrete column 20 after being built, and protrudes outward from the stoppers 14. A portion to be engaged with the upper end surface of the head.

The two orthogonal end plates 12 and 13 of the stopper metal fitting 14 are welded at intersections, and one end 12a and 13a of each of the two orthogonal end plates 12 and 13 are cranked upward. Is folded into
Here, a stopper portion for engaging with the upper end surface of the head of the precast concrete column 20 is formed.

The two orthogonal end plates 1
Each of the other ends 12b, 13b of the second 2, 13 extends horizontally, and a plurality of screw holes 16, 16,... Are formed at predetermined intervals. Further, one end plate 13
Is formed in a substantially U-shape through a step, and the depth of the U-shaped portion 17 is equal to the thickness of the end plate 12 and overlaps with the end plate 12. Forming part. Further, bolt insertion holes 15, 15 are provided at both ends of each frame 11 at predetermined intervals (the bolt holes 16, 15).
16,... Are different from each other. ) Are drilled.

On the end plates 12 and 13 of the stopper 14 formed in a cross shape as described above, the lower surface of the end of the frame 11 is mounted on the upper surfaces of the other ends 12b and 13b. At the same time, the bolt insertion hole 15 and the screw hole 16 are aligned with each other, and a hexagon bolt 18 is inserted and screwed into this, and fastened and fixed. The four frames 11, 11,... Are connected to each other via the stopper fittings 14, thereby forming the holding members 10 of the column main bars in a cross-girder shape.

At this time, the interval between the two sets of frames arranged in parallel is determined by the column main reinforcement 3 inserted through the precast concrete 20 with a predetermined clearance from the inner surface thereof.
0, 30,... (Determined from the structural design). That is, the adjustment of the frame interval is performed by arbitrarily selecting the screw hole 16 of the stopper fitting 14 and the bolt insertion hole 15 of the frame 11.

Next, the operation of the holding member 10 will be described. First, the precast concrete column 20 is placed on the column main bars 30, 30,.
From the upper part of the notch 21 of the precast concrete column 20 from above.
Insert 0, ... and add. Then, the holding member 10 is dropped into the head of the precast concrete column 20 from above. Then, the end plate 1 of the stopper fitting 14
A stopper formed in a crank shape at one end 12a, 13a of each of the precast concrete columns 20 comes into contact with and engages with an upper end surface 22 of the head of the precast concrete column 20, whereby the dropped holding member 10 is inserted into the inside of the precast concrete column 20. Falling is prevented. At this time, each frame 1
Are in contact with the column main bars 30, 30, and support them with a predetermined clearance from the inner peripheral surface of the precast concrete. After that, the intersections of the frames 11, 11,... Of the holding member 10 and the main pillars 30, 30,. Therefore, when the precast concrete column 20 is built, the column main reinforcement 30,
.. Can be easily determined and held securely.

In this embodiment, the main pillar 30 is bound and bound to the outside of each of the frames 11, 11,... Of the holding member 10, but the bolt of the holding member 10 is positioned inside. The mounting position may be changed.

In the present embodiment, the end plates 12,
A plurality of bolt insertion holes 15,... And screw holes 16,... Are provided in the other end 12b, 13b of the frame 13 and the frame 11, respectively, and mutual connection holes between the bolt insertion holes 15 and the screw holes 16 are arbitrarily selected. By doing so, the cross-girder holding member 1
Although 0 can correspond to various dimensions and shapes, if the bolt insertion hole 15 is made to be an elongated hole, it becomes possible to correspond to the dimensions and shapes more precisely. Alternatively, the screw hole 16 may be replaced with a bolt insertion hole and fastened with a nut.

[0019]

[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 be able to.

Further, since the stopper fitting and the frame are fastened by bolts so as to be dimensionally changeable, the interval between the frames arranged in parallel can be arbitrarily adjusted in accordance with the position of the column main bar determined from the structural design. Can be
Therefore, it is possible to cope with precast concrete columns of various sizes, and the diversion can be performed, so that the economic effect is high.

[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 view taken along a line VV shown in FIG. 3;

FIG. 6 is a perspective view showing a state where a holding member is mounted on a head of a precast concrete column.

FIG. 7 is a top view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Main column holding member 11 Frame 12, 13 End plate 12a, 13a
Stopper end 12b, 13b End 14 Stopper metal fitting 15, 16 Bolt hole 18 Hexagon bolt 20 Precast concrete column 30 Column main reinforcement

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toru Ohno 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) References JP-A-2-8011 (JP, A) JP-A-2 229364 (JP, A) JP-A-1-125469 (JP, A) JP-A-6-62110 (JP, U) JP-A-6-20664 (JP, U) JP-A-53-112914 (JP, U) 52) 30612 (JP, U) (58) Field surveyed (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 being built, and positions a plurality of column main reinforcements to be inserted and arranged in the internal space of the precast concrete column. The main frame is a holding member of a pillar main bar. The four frames are connected to each other via cross-shaped stopper fittings fastened and fixed to both ends of each of the frames by forming a cross-shaped cross-girder. And the interval between the two sets of frames arranged in parallel is the interval in contact with each pillar main bar arranged with a predetermined clearance from the inner peripheral surface of the precast concrete column, and The part protruding outward has a stopper portion which is bent upward in a crank shape and is engaged with the upper end surface of the precast concrete column. Column main bar holding member.