JPH0742762B2 - Upper half PC concrete pillar and construction method of this pillar - Google Patents

Description

The present invention relates to an upper half PC concrete column and a method of constructing this column.

(Prior Art) Conventionally, as a method of connecting a PC concrete column and a lower column,
As shown in the figure, after the PC column H has been built, the reinforcing bar R protruding at the lower end is joined to the reinforcing bar of the lower column by an appropriate joining method,
Then, the joint part form K is assembled on the outside of the joint part, and after assembling, the joint part J is formed by filling concrete C into the form from the chute part Ka at the upper end of the form.

(Problems to be solved by the invention) However, according to the conventional example, the placing pressure of concrete is small and the concrete is not sufficiently filled in the joint portion, so that a cavity is generated in the peripheral portion of the lower end surface of the PC column portion. There was an inconvenience.

An object of the present invention is to provide an upper half PC concrete column which improves the filling property of the concrete in the joint portion and enhances the integration of the PC column portion and the concrete of the joint portion, and a construction method of this column. .

(Means for Solving Problems) The characteristics of the upper half PC concrete column according to the present invention are as follows.
A PC pillar portion and a lower half joint portion are integrally formed, and a concrete injection hole is formed in an axial center portion of the PC pillar portion, and the concrete injection hole is a tremie pipe. With the internal shape that is necessary for insertion, it is formed in a penetrating state that reaches from the upper end of the PC column to the joint.
The cross-sectional shape of the lower end of the column is an inverted V shape centered on the lower end opening of the concrete injection hole, and the column rebar projects from the lower end of the PC column into the joint, and the hoop is attached to the column rebar. The streaks are wound, and by filling the joint portion and the concrete injection hole with concrete, the joint portion is formed of concrete, and the PC pillar portion is connected to the lower pillar through the joint portion. Where it is possible.

The feature of the construction method of the PC concrete pillar according to the present invention is that the concrete injection hole penetrates the shaft center from the upper end to the lower end, and the cross-sectional shape of the lower end is an inverted V shape centering on the lower end opening of the concrete injection hole. Yes, it is to construct this pillar using a PC pillar portion characterized by protruding pillar rebar from the lower end, first building the PC pillar portion, then
Position the lower end of the PC column apart from the lower column by the distance between the joints, and press-connect the column reinforcement of this PC column and the column reinforcement of the lower column,
After joining by using a joining method such as fixing, a form is assembled outside the position that will be the joint part at the bottom of the PC column part, and after assembly, fresh concrete is tremeyed from above the concrete injection hole toward the joint part. It is in the process of being sequentially filled from the joint portion to the injection hole using a pipe injection means.

(Operation) In the stage before placing the concrete into the concrete injection hole, the PC column part is lighter by the amount of concrete that enters the concrete injection hole, and the PC part is the length of the joint part.
Since the length of the pillar can be shortened, the shorter the length, the lighter the weight. Further, the concrete in the joint portion is subjected to a placing pressure by placing from the concrete pouring hole located above at the time of pouring the concrete, and a pushing force of the filled concrete on the side of the concrete pouring hole after placing.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

First, the structure of the upper half PC concrete column will be described with reference to FIGS.

In FIG. 1, an upper half PC concrete pillar according to the present invention is formed by integrally forming an upper half PC pillar portion 1 and a lower half joint portion 3.

Therefore, the structure of the upper half of the PC column portion 1 will be described. A concrete injection hole 11 that extends from the upper end portion to the lower end portion, that is, the joint portion 3, penetrates through the axial center portion of the PC column portion. The number of concrete injection holes 11 may be plural. The concrete injection hole 11 has an inner diameter of the limit necessary for inserting the tremie pipe 8 (Fig. 4A), and the concrete 2 is filled in the injection hole. It is integrally combined with the concrete of the joint portion 3 provided at the lower end of the portion 1, and this joint portion is connected to the lower pillar (not shown). The cross-sectional shape of the lower end of the PC pillar 1 has an inverted V shape centered on the lower end opening of the concrete injection hole 11.
The shape is V-shaped, and therefore the filling property of the concrete 2 in the joint portion 3 is improved. As shown in the second drawing, a hoop bar 4b is wound around the column reinforcing bar 4 projecting into the joint section 3 below the lower end of the PC column section 1, and this column reinforcing bar has a column reinforcing bar of the lower column. (Not shown). A PC floor plate 6a is supported on the upper surface of the PC pillar 1.

Next, a method of constructing an upper half PC concrete column using the PC column portion 1 will be described with reference to FIGS. 4A to 4D.

First, as shown in FIG. 4A, the PC pillar 1 is suspended, and the lower end of the pillar rebar 4 protruding from the lower end of the PC pillar is placed on the upper end of the pillar rebar 4a protruding to the upper surface of the slab 6 of the lower pillar. Butt, then the butted portions are pressed together, and then the hoop reinforcement 4b is wound around the pillar reinforcements 4 and 4a. Then, the mold 7 is set outside the position that becomes the joint portion 3, and after setting, the concrete injection hole
11 Insert the tremie pipe 8 from above, and lower the lower end of this tremie pipe to the joint 3 below the PC column 1. Therefore, as shown in FIG. 4B, the tremie pipe 8 is used to fill the fresh concrete 2 into the joint portion 3 at a predetermined pressure.
At the stage where the filling of the joint part 3 with concrete is completed, the 4C
As shown in the figure, while continuing the injection work of the tremie pipe 8, the tremie pipe is pulled up and the concrete injection hole 11
The fresh concrete 2 is filled in. After the filling work is completed as shown in FIG. 4D, slab concrete is cast on the PC floor plate 6a to form the synthetic slab 6. By removing the form 7, the upper half PC concrete column shown in FIG. 1 is constructed.

The PC floor board 6a is supported on the upper surface of the PC pillar portion 1 when the pillar reinforcing bars 4 and 4a are joined to each other and erected on the lower pillar slab 6.

Further, the lower end of the column rebar 4 of the PC column 1 may be joined to the column rebar of the lower column by inserting it into a joint member embedded in the lower column. The position of the joint of 1 does not necessarily have to be on the slab 6.

Another embodiment will be described with reference to FIG. 3. The concrete injection hole 11a is formed by using a pipe 5, and in this case, this pipe 5 is embedded in the pillar concrete in the process of manufacturing the PC pillar portion 1. To be done.

(Effect of the invention) The column of the present invention has a concrete injection hole in the upper half of the PC column, so that the amount of concrete injected into the concrete hole can be reduced before concrete filling, and the length of the joint portion can be reduced. Only because the length of the PC pillar can be shortened, the shorter the length, the lighter the weight and the easier the transportation and construction. And since the concrete injection hole and the joint are in communication, the upper half of the PC pillar and the lower half of the joint can be integrated by the concrete to be filled, and the cross-sectional shape of the lower end of this PC pillar is , Since it is an inverted V shape centering on the lower end opening of the concrete injection hole, part of the concrete at the joint part
It will be located in the lower end of the PC column, strengthening the integration of the two.

Further, according to the construction method of the present invention, since the concrete is filled from above the concrete injection hole by the tremie pipe toward the joint portion, the pouring head of the concrete becomes high, and therefore the concrete is poured into the fresh concrete of the joint portion. Pressure is generated,
Concrete can be filled up to every corner of the joint, and the filling property can be improved. Moreover, the cross-section of the lower end of the PC column is an inverted V shape, and the mold for the joint below this lower end. Since the concrete is filled in the frame, the concrete smoothly flows from the concrete injection hole into the mold, and the filling property is good.

[Brief description of drawings]

 FIG. 1 is a sectional view of a PC pillar portion, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a lateral sectional view of another embodiment of the PC pillar portion, and FIGS. 4A to 4D are Sectional drawing which shows the construction process, FIG. 5 is sectional drawing which shows the construction example of a prior art example. 1 …… PC column part 11 …… Concrete injection hole 11a …… Concrete injection hole 2 …… Green concrete 3 …… Joint part 4,4a …… Column rebar 4b …… Hoop bar 7 …… Form 8 ： Toremy tube

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-130955 (JP, A) Sekikai-SHO 58-161006 (JP, U) JP-B 53-6462 (JP, B2) JP-B 51- 39928 (JP, B2) JP-B-52-4093 (JP, B2)

Claims (2)

[Claims] 1. An upper half of the PC pillar portion and a lower half of the joint portion are integrally formed, and a concrete injection hole is formed in the axial center portion of the PC pillar portion, The concrete injection hole is an internal shape of the limit required for the tremie pipe to be inserted, and is formed in a penetrating state from the upper end of the PC column to the joint, and the cross-sectional shape of the lower end of the PC column is , A reverse V-shape centered on the lower end opening of the concrete injection hole, a column reinforcing bar projects from the lower end of the PC column part into the joint part, and a hoop bar is wound around the column reinforcing bar. And by filling the concrete injection hole with concrete, the joint portion is formed of concrete, and the PC pillar portion is connectable to the lower pillar through the joint portion. PC concrete pillar. 2. A concrete pouring hole is penetrated from an upper end to a lower end in an axial center portion, and a cross-sectional shape of the lower end portion is an inverted V shape centering on a lower end opening of the concrete pouring hole, and a column reinforcing bar is projected from the lower end portion. In the method of constructing a column by using the upper half PC column part in which the hoop reinforcement is wound around this column rebar, first, the above-mentioned PC column part is built, and then it is projected from the lower end part of the above-mentioned PC column part. Joined to the lower column's column rebar through the column rebar, and then assembled the formwork outside the position to be the joint part of the lower part of the above PC column part. A method of constructing an upper half PC concrete column, characterized by pouring fresh concrete into the concrete part and sequentially filling the concrete injection hole from the joint part.