JP3201849B2 - Column construction method using precast concrete shell columns - 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 of placing a column main reinforcement accurately using a column main reinforcement holding bracket, so that a precast concrete outer column member is easily dropped from above onto the outside of the column main reinforcement. Thereafter, the present invention relates to a method of constructing a pillar of a structure by placing concrete in the outer column member.

[0002]

2. Description of the Related Art Conventionally, as a method of constructing a pillar of a structure using a precast concrete outer pillar member,
As disclosed in Japanese Patent Application Laid-Open No. 61-165453, a precast concrete outer column member having a large number of shear reinforcing bars embedded in the inner peripheral surface is lifted and lowered so as to cover the outer side of the column main bar. A method of casting concrete in the outer column member is known.

[0003]

In the conventional column construction method, since the upper portions of the column main bars are not connected, the column main bars are unstable in the lateral direction, and therefore, the column main bars are provided on the inner surface of the outer column member. It is difficult to accurately arrange the main pillars so that the pillars are in contact with or close to each other.

[0004]

In order to advantageously solve the above-mentioned problems, a method of constructing a column using a precast concrete outer column member according to the present invention is directed to a vertical cylindrical shape penetrating in a vertical direction. The precast concrete outer column member 1 is suspended from above the column main bar 2 and the column main bar 2 is suspended therefrom.
In the method of constructing a reinforced concrete column by placing concrete 3 in the outer column member 1 and then placing the concrete 3 in the outer column member 1 , a frame body is formed with the upper part of the four corner column main reinforcements 4 in the center.
Connected via the position holding metal fitting 5 having the position holding metal.
Slab concrete so that the upper end of the frame of
After constructing the seat 6, the lower part of the temporarily assembled upper main column reinforcement 7 is connected to the upper part of the lower main column reinforcement 8, and then the outer column member 1
Is put on the column main bar 7 on the upper floor, and concrete 3 is poured into the outer column member 1. At this time, the pillar main bars other than the four corners are regularly shaped by the temporary assembling bar (hoop bar) 30.

[0005]

10 to 14 show a precast concrete outer column member 1 used in an embodiment of the present invention.
A large number of truncated conical recesses 13 are staggered at regular intervals on the inner peripheral surface of an outer column member body 14 formed of a vertical cylindrical body having a rectangular cross section penetrating in the vertical direction. A number of shear reinforcing bars 15 are embedded in the inner peripheral surface of the outer column member main body 14 at positions not overlapping with the recesses 13 at intervals in the longitudinal direction of the outer column member main body 14, In addition, a hole 16 serving as a cleaning hole and a drainage hole is provided at a lower portion of the outer pillar member main body 14, and the concave portion 13 forms a shark when concrete is poured into the outer pillar member 1.

FIG. 15 to FIG. 17 show the position holding bracket 5 used in the embodiment of the present invention. The position holding bracket 5 is provided outside each corner of a rectangular frame 17 made of a vertical steel plate. The arm 18 projecting in the diagonal direction is fixed by welding, and the holding plate 20 fixed by welding to the groove bottom of the U-shaped bracket 19 is superimposed on the arm 18 and fixed by bolts 21. Each of the arms has a fastener 2 having an inclined engagement member 22 and a screw rod 23.
4 is inserted, a nut 25 is screwed into the screw rod 23,
The corner column main reinforcement 4 inserted into the U-shaped bracket 19 is fastened and fixed by the nut 25 via a fastener 24.

A base end of a support arm 27 is fixed by welding to at least the outside of the center of the two frame rods 26 facing each other in the frame 17, and a vertical female screw member 28 is attached to the distal end of the support arm 27. Are fixed by welding, and a level adjusting bolt 29 is screwed to the female screw member 28.

Next, a method of constructing a column of a structure using the outer column member 1 and the position holding fitting 5 will be described. First, as shown in FIG. 1, a portion near the upper part of each corner column main bar 4 in the lower column main bar 8 is connected by the position holding metal 5, and each intermediate column main bar 10 in the lower column main bar 8 is connected. The upper part is arranged so as to be located outside the position holding metal fitting 5, and the main bar of the middle column is regularly shaped by the hoop streak just below the position holding metal fitting 5. In this state, the slab concrete 6 is poured into a portion of the position holding bracket 5 up to the upper end level of the support arm 27.

Next, as shown in FIG. 2 and FIG. 3, the temporary assembling rebars 30 and the temporary assembling members which come into contact with the inner surfaces of the corner column main reinforcing bars 9 and the intermediate column main reinforcing bars 11 without shear reinforcing bars. The upper main column reinforcement 7 is assembled by using the diagonal member 37, the upper main column reinforcement 7 is lifted by a crane and lowered onto the lower main column reinforcement 8, and each corner of the upper main column main reinforcement 7 is lowered. The column main bar 9 and each corner column main bar 4 in the lower column main bar 8 are connected by butt welding, and the lower end of each intermediate column main bar 11 in the upper column main bar 7 and the lower column main bar 8 The upper end of each intermediate pillar main bar 10 is connected by a butt joint, a crimp joint or a lap joint 12 or the like. As shown in FIG. 3, for example, as shown in FIG. 3, the upper end portion of the intermediate column main reinforcement 10 and the lower end portion of the intermediate column main reinforcement 11 are overlapped by a necessary length for strength and bound by a binding wire 31. Adopt fittings.

Next, as shown in FIG.
After being lifted by a crane, the outer column member 1 is
It is suspended so as to cover a portion except the upper part of the main bar 7 on the upper floor and the upper part of the main bar 8 on the lower floor, and as shown in FIG.
The lower end surface of the outer column member 1 is placed on the level adjusting bolt 29 of the position holding bracket 5. At this time, the frame 17 is arranged in the outer column member 1, and the level of the outer column member 1 is adjusted by the level adjusting bolt 29.

As shown in FIGS. 6 and 7, a pair of L
A closing metal fitting 34 having a shape is brought into contact with a lower outer surface of the outer column member 1 to close a gap between a lower portion of the hole 16, a lower end surface of the outer column member 1 and an upper surface of the slab concrete 6, and The ends of the closing fittings 34 are connected by bolts 35. Next, a grout material 33 is filled from the hole 16 to the space between the frame 17 and the lower portion of the outer column member 1.

Next, as shown in FIG. 8, after the outer column member 1 is supported by a plurality of temporary column fixing columns 36 whose length can be adjusted, concrete 3 is placed in the outer column member 1 as shown in FIG. The concrete 3 is poured, and the concrete 3 is also filled in the recess 13 of the outer column member 1 to form a shark.

The frame 17 of the position-holding metal member 5 is interposed between the joint surfaces of the columnar concrete, and has the effect of generating the action of the dowel hardware to supplement the strength of the joint surface.

[0014]

According to the present invention, a vertical cylindrical precast concrete outer column member 1 vertically penetrating therethrough.
Is suspended from above the column main bar 2 fixed to the temporary assembling bar 30 and put over the column main bar 2, and then concrete 3 is poured into the outer column member 1, and the reinforced concrete column is In the method of building, the four corner corners above the main bar 4
Parts are connected via position holding metal fittings 5 having a frame at the center.
Then, the upper end side portion of the frame of the position holding bracket 5 projects.
After the slab concrete 6 has been constructed, the lower part of the temporarily assembled upper main column reinforcement 7 is connected to the upper part of the lower main column reinforcement 8, and then the outer column member 1 is placed over the upper main column reinforcement 7, Since concrete 3 is cast into the outer column member 1,
The column main bars at the four corners of the column main bar 8 on the lower floor can be held so as not to relatively move laterally, and the column main bars in the middle part can be held in an orderly manner by the temporary assembling bar 30, For this reason, the lower part of the temporarily assembled upper column main reinforcement 7 can be easily and accurately connected to the upper part of the lower floor column main reinforcement 8, and further, the lower floor column main reinforcement 8 and the upper floor column main reinforcement 7 are connected.
Can be cast into the outer column member 1 in a state of contacting or approaching the inner peripheral surface of the outer column member 1, so that even if the precast concrete outer column member 1 is used, Strength columns can be built.
Further, the lower part of the corner column main bar 9 of the upper column column bar 7 is connected to the upper part of the corner column main bar 4 of the lower floor column bar 8 by butt welding, and the intermediate column main bar 10 of the lower floor column bar 8 is connected. In the upper part of the column, the intermediate column main bar 11 in the upper column main bar 7
Are connected by a lap joint 12 so that the column main reinforcement 8 on the lower floor can be connected.
The lower part of the pillar main bar 7 on the upper floor can be easily connected to the upper part of the floor. Furthermore, by providing a large number of recesses 13 around the inner surface of the outer pillar member 1, the concrete 3 cast into the outer pillar member 1 can enter the recess 13 to constitute a shark. Therefore, the outer column member 1 and the concrete 3 cast therein can be strongly integrated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a position holding metal fitting is mounted above a main bar of a lower floor.

FIG. 2 is a perspective view showing a state in which a column main bar on the upper floor is suspended above a column main bar on the lower floor.

FIG. 3 is a side view showing a state in which a lower part of a column main bar on the upper floor is connected to an upper part of a column main bar on the lower floor.

FIG. 4 is a side view showing a state in which an outer pillar member is hung over the upper part of the lower main column main reinforcement and the upper main column main reinforcement.

FIG. 5 is a partially longitudinal side view showing a state where the outer column member is placed on a level adjusting bolt of a position holding bracket.

FIG. 6 is a partially longitudinal side view showing a state in which a grout material is filled between a lower portion of an outer pillar member and a frame of a position holding bracket.

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a perspective view showing a state in which the outer column members are supported by temporary columns.

FIG. 9 is a longitudinal sectional side view showing a state where concrete has been poured into the outer pillar member.

FIG. 10 is a perspective view of an outer pillar member.

FIG. 11 is a cross-sectional plan view of the outer column member.

FIG. 12 is a longitudinal sectional side view showing a part of an outer pillar member.

FIG. 13 is an enlarged cross-sectional plan view showing a corner of the outer column member.

14 is a longitudinal sectional side view showing a part of FIG. 12 in an enlarged manner.

FIG. 15 is a plan view of a position holding bracket.

FIG. 16 is a side view of the position holding bracket.

FIG. 17 is an enlarged plan view showing a part of the position holding bracket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast concrete outer column member 2 Column main reinforcement 3 Cast-in-place concrete 4 Corner column main reinforcement 5 Position holding bracket 6 Slab concrete 7 Upper floor column main reinforcement 8 Lower floor column main reinforcement 9 Corner column main reinforcement 10 Middle column main reinforcement 11 Intermediate Main pillar main bar 12 Lap joint 13 Recess 14 Outer column member main body 15 Shear reinforcing bar 16 Hole 17 Frame 18 Arm 19 U-shaped bracket 20 Holding plate 21 Bolt 22 Inclined engaging member 23 Screw rod 24 Fastener 25 Nut 26 Frame rod 27 Support arm 28 Female screw member 29 Level adjustment bolt 30 Temporary assembling streaks 31 Binding wire 33 Grout 34 Closing bracket 35 Bolt 36 Temporary column fixing column 37 Temporary assembly diagonal

──────────────────────────────────────────────────続 き Continued on the front page (72) Katsuhiko Nakano, Inventor 3-3-16-503 Nagayama, Tama-shi, Tokyo (72) Inventor Jin Morimoto 6-8-6, Todoroki, Setagaya-ku, Tokyo (72) Inventor, Ei Nakajima (1) 1-8-2-805 Toyooka, Iruma-shi, Saitama (72) Inventor Kaaki 1341-6, Kamiyasumatsu, Tokorozawa-shi, Saitama (72) Inventor Yukio Nakamura 270 Shirai-cho, Inba-gun, Inba-gun, Chiba (72) Inventor's city Nobuo Mura 7-505 2-chome, Shibayama 2-chome, Funabashi-shi, Chiba (72) Inventor Keiichi Abe 2-3-812 Irifune, Urayasu-shi, Chiba (56) References JP-A-4-216747 (JP, A) JP-A Sho 52-15142 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/16 E04C 3/00-3/46 E04G 21/12 105

Claims (2)

(57) [Claims] 1. A vertical cylindrical prepress penetrating vertically.
Secure the outer concrete column members to temporary
Suspended from above the specified column bar, and
And then cast concrete into the outer column members
The method of constructing reinforced concrete columns
Maintain the position of the upper part of the main bar of the corner with a frame in the center
Connected via a metal fitting, the upper end side of the frame of the position holding metal
The slab concrete was constructed so that the part protruded
In addition, the lower part of the temporarily assembled upper main column is placed above the lower main column
Part, and then cover the outer column member to the main bar of the upper floor.
And place concrete in the outer column members.
Construction of columns using cast concrete shell columns
Method. 2. The upper part of a corner column main bar in a lower column main bar.
At the bottom of the upper column, the lower part of the corner column main bar
Above the middle column in the lower column
In the section, the middle column main reinforcement of the upper floor column reinforcement is connected with lap joints.
The precast concrete outer pillar portion according to claim 1, wherein the outer pillar portion is formed.
How to build pillars using timber.