JPH0118229B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application This invention is directed to the construction of reinforced concorite columns that enable prefabricated column reinforcing bars when the columns are double-reinforced reinforced concorite structures and the beams are reinforced concorite structures. It is about the method.

Background of the Invention When building a high-rise building using reinforced concrete, the columns on the lower floors bear all of the load from the upper floors, so it is necessary to increase the amount of steel, which has better strength per cross-sectional area than concrete, and reduce the cross-sectional area of the columns. There is.

In this case, in order to increase the amount of iron and improve the performance of the column, the number of reinforcing bars in the column is increased, but the number of reinforcing bars that can be placed in a row depends on the size of the column and the fit with the beam reinforcement. Limited. For this reason, the reinforcing bars are arranged in a double arrangement, one on the inside and one on the outside.

However, when reinforcing bars are double-arranged, if the column main reinforcement is prefabricated, the connection of the inner reinforcing bars will be obstructed by the outer reinforcing bars, so the work will have to be assembled on site, resulting in poor workability.

There are two conventional work procedures:

(1) As shown in Figure 1a, first connect the inner column main reinforcement 1 (hereinafter referred to as middle reinforcement 1) to the reinforcing bars on the lower floor on the existing part of the column, and as shown in Figure 1b,
Wrap hoop muscle 2 around it. Next, as shown in Fig. 1c, connect the outer column main reinforcement 3 (hereinafter referred to as external reinforcement 3) to the reinforcing bars on the lower floor, and as shown in Fig. 1d, hoop reinforcement 4 is installed around the external reinforcement 2. Roll.

(2) As shown in Fig. 2a, first connect the middle reinforcement 1 to the reinforcing bars on the lower floor, and then connect the external reinforcement 3 to the reinforcing bars on the lower floor as shown in Fig. 2b. Next, as shown in Fig. 2c, wrap the hoop muscle 2 around the middle muscle 1,
As shown in FIG. 2d, the hoop muscle 4 is wrapped around the external muscle 3.

However, all of these processes require on-site assembly, which is time-consuming and inefficient.

In addition, Figures 3 and 4 show examples of reinforcement when columns are double-reinforced. 7 and 8 are used in combination with hoop muscle 9. Further, in the figure, 5 is the main reinforcement of the beam, and 6 is the stirrup.

Purpose of the Invention This invention devises a construction method that makes it easy to prefabricate columns with double reinforcement, which was difficult to prefabricate as described above. The aim is to expand the scope of application so that the benefits of reinforcement can be fully utilized.

Structure of the Invention The present invention includes a prefabricated medium muscle consisting of a plurality of medium muscles in the axial direction and a hoop muscle or a spiral muscle that restrains the medium muscles, and an external muscle that consists of a plurality of external muscles in the axial direction and a hoop muscle or spiral muscle that restrains the external muscles. Use muscle prefabs.

When hoisting, the inner medium reinforcement prefab and the outer external reinforcement prefab are connected and integrated using a chain, etc., and the intermediate reinforcement prefab is lifted with the intermediate reinforcement prefab protruding downward from the external reinforcement prefab in the column axis direction, and then placed at the predetermined column erection position. and connect it to the existing column reinforcing bars on the lower floor. At this time, a gap is created at the lower end of the external muscle prefab due to the protrusion of the middle muscle prefab, and the middle muscle prefab is first joined from that gap. After performing necessary reinforcement such as hoop wrapping at the joint of the middle reinforcement prefab, shift the external reinforcement prefab downward in the direction of the column axis and connect it with the existing lower floor external reinforcement prefab to perform the necessary reinforcement. Complete the assembly.

Note that if the middle reinforcement prefab on the lower floor is made to protrude upward in advance, a gap will be created above and below the outer reinforcement prefab when joining the middle reinforcement prefab, making the work even easier.

Embodiment FIGS. 5 to 10 show the construction procedure in an embodiment of the present invention, and the construction is carried out in the following procedure.

(1) Assembling the medium reinforcement prefab (Fig. 5) A plurality of medium reinforcements 1 are erected at predetermined intervals using a medium reinforcement fixing jig 10, etc., and spiral reinforcements 7 are attached around the periphery to form the medium reinforcement prefab.

(2) Assembling the external reinforcement prefab (Fig. 6) A plurality of external reinforcements 3 are erected at predetermined intervals on the outside of the intermediate reinforcement prefab using an external reinforcement fixing jig 11, etc., and spiral reinforcements 8 are placed around them. Attach it and use it as an external muscle prefab. In addition, if a depression is prepared in advance at the reinforcing bar prefab assembly location, the middle reinforcement prefab is assembled in the depression, the outer reinforcement prefab is assembled outside of the depression, and the two are connected using a chain 12 or the like, the middle reinforcement prefab can be moved in the column axis direction. It can be lifted as a whole in a protruding state.

(3) Hoisting prefabricated reinforcing bars (Fig. 7) Hang wires to the intermediate reinforcement fixing jig 10, external reinforcement fixing jig 11, etc., and place the intermediate reinforcement prefabricated and external reinforcement prefabricated as one at the top end of the existing reinforced concrete concorite column. hang it in.

(4) Joining the middle reinforcement prefab (Fig. 8) The lower end of the middle reinforcement prefab is butted against the upper end of the existing middle reinforcement prefab, and the upper and lower Join the middle reinforcements 1 and 1'.

(5) Hoop wrapping at the prefabricated joint of the middle reinforcement (Fig. 9) Hoop wire 14 is placed at the joint of the upper and lower middle reinforcements 1 and 1'.
Wrap around to strengthen the joint.

(6) Joining of external muscle prefab and hoop winding (first
(Figure 0) To connect the external muscle prefab, remove or loosen the chain 12, gradually lower the external muscle prefab, butt the lower end of the external muscle prefab against the upper end of the existing external muscle prefab, and connect the upper and lower external muscle prefab 3, 3. ′ is joined. A hoop reinforcement 15 is also wrapped around the joint between the upper and lower external reinforcements 3, 3' to reinforce the joint.

Note that 13 in the figure is a connecting piece that connects the medium reinforcement fixing jig 10 and the external reinforcement fixing jig 11.

FIGS. 11 to 14 show the state in which the medium reinforcement fixing jig 10 and the external reinforcement fixing jig 11 are used.

FIG. 11 is a plan view of the medium reinforcement fixing jig 10,
A frame is formed by framing a shape material 16 such as an angle material into a rectangular shape, and the inner peripheral edge of this frame is cut out to form a corner 17 corresponding to the position of the middle reinforcement 1. This medium reinforcement fixing jig 10 can be used as a guide for positioning the medium reinforcement 1 when assembling the medium reinforcement prefabricated.
When the intermediate reinforcement 1 is fixed and suspended, a wire or the like is hung through the locking hole 18, and it can be used as a lifting jig.

FIG. 12 is a plan view of the external muscle fixing jig 11,
Similar to the intermediate reinforcement fixing jig 10, a profile material 1 such as an angle material
9 is framed into a rectangular shape to form a frame, and the inner peripheral edge of this frame is cut out to form a corner 20 corresponding to the position of the external reinforcement 3.

Figure 13 shows a cross section corresponding to Figure 9 in the construction procedure described above, and shows the intermediate reinforcement fixing jig 1.
0 and an external muscle fixing jig 11 are connected by a chain 12. It should be noted that it is convenient to lower the external muscle prefab after joining the middle muscle prefab if a mechanism for gradually lowering the external muscle prefab is installed in the connecting portion of the chain 12. In this state, locking hole 1
Hook wires to 8 and 21 and lift it up.

FIG. 14 shows a cross section corresponding to FIG. 10, and after lowering the external reinforcement prefab, the intermediate reinforcement fixing jig 10 and the external reinforcement fixing jig 11 are attached to the locking holes 18, 19.
They are connected using the connecting tool 13.
The external reinforcement fixing jig 11 has a profile 19 protruding from both sides in one direction, and can be fixed to the floor form using nail holes provided in the protruding portion. Therefore, movement of the reinforcing bars during concorret pouring is prevented.

Effects of the Invention The present invention has the above-mentioned configuration, and since the reinforcing bars are prefabricated in the double-reinforced reinforced concorite column, it is possible to significantly shorten the construction period and improve construction efficiency and accuracy. Furthermore, since the intermediate reinforcing bars are joined to the external reinforcing bars in a protruding state, the upper and lower reinforcing bars can be joined smoothly.

[Brief explanation of drawings]

Figures 1 a to d and Figures 2 a to d are cross-sectional views showing the construction procedure in a conventional example, Figures 3 and 4 are cross-sectional views showing an example of double reinforcement, and Figure 5 is a cross-sectional view showing an example of double reinforcement.
10 are front views showing the construction procedure in an embodiment of the present invention, FIG. 11 is a plan view of the intermediate reinforcement fixing jig, FIG. 12 is a plan view of the external reinforcement fixing jig, and FIGS. 13 and 14. The figures are cross-sectional views corresponding to FIGS. 9 and 10, respectively. 1... Middle muscle, 2... Hoop muscle, 3... External muscle, 4
...Hoop muscle, 5...Main beam reinforcement, 6...Starlap, 7...Spiral muscle, 8...Spiral muscle,
9... Hoop muscle, 10... Middle muscle fixing jig, 11...
...External muscle fixing jig, 12...Chain, 13...Connection piece, 14...Hoop muscle, 15...Hoop muscle, 1
6... Shape material, 17... Corner, 18... Locking hole, 1
9... Shape material, 20... Corner, 21... Locking hole, 2
2... Nail hole.

Claims (1)

[Claims] 1. A double-reinforced reinforced concrete column consisting of a plurality of axially extending internal reinforcements restrained by hoop reinforcements or spiral reinforcements and a plurality of axially extending external reinforcements further restrained by hoop reinforcements or spiral reinforcements. In the construction method, an external reinforcement prefab consisting of an external reinforcement and a hoop or spiral reinforcement that restrains the external reinforcement is assembled outside the intermediate reinforcement prefab consisting of an intermediate reinforcement and a hoop or spiral reinforcement that restrains the intermediate reinforcement, and the intermediate reinforcement prefab is and the external reinforcement prefab are shifted in the direction of the column axis and suspended in a predetermined position with the intermediate reinforcement prefab protruding downward.First, the intermediate reinforcement prefab is connected to the existing lower floor intermediate reinforcement prefab, and then the external reinforcement prefab is A method of constructing a reinforced concrete column, which is characterized by shifting the column downward in the axis direction and connecting it to an existing prefabricated external reinforcement on the lower floor.