JPS6347469A - Method of construction for preassembly of column reinforcement - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention particularly relates to a pre-assembly method for column reinforcements in reinforcement work for large structures such as nuclear power plant buildings.

[Conventional technology]

As shown in FIGS. 9 and 10, threaded reinforcing bars 1 are used for the large diameter reinforcing bars of such large structures, and the reinforcing bar joints are mechanically joined using lock nuts 2a and couplers 2b as coupling members 2. construction method has been adopted. This can streamline construction as an alternative to pressure welding and other troublesome and time-consuming joint construction methods, and connects the lock nand 2a and coupler 2b to the threaded reinforcing bar 1 on one side of the differential bar, and connects the lock nand 2a and coupler 2b to the threaded reinforcing bar 1 on the other side. A lock nut 2a is set in advance, the ends of both threaded reinforcing bars 1 are brought together, the campler 2b is moved to straddle them, and the lock nut 2a is rotated on both sides to tighten.

By the way, to explain the conventional method of reinforcing column reinforcement using such threaded reinforcing bars 1, as shown in Fig. 11, temporary reinforcing bars 3 are placed inside the reinforcing bars 3 that have already been arranged to protrude from the existing frame. The steel frame frame 4 is set, and the column main reinforcements 5 made of threaded reinforcing bars are lifted one by one using a crane or the like and moved to a predetermined reinforcement position.

Next, the column main reinforcement 5 and the difference reinforcement 3 are joined by a Rocknand joint using the joint member 2, and the upper end of the joined column main reinforcement 5 is attached to the temporary steel frame to prevent horizontal collapse and to maintain the reinforcement pitch. Temporarily fix the upper end of the pedestal 4 to the columnar support 6. 8 in the figure indicates a scaffold.

Thereafter, the hoop reinforcing bars 7 are wound around the main pillar reinforcing bars 5, and these are secured with binding wires 14 to complete the assembly of the pillar portion.

On the other hand, although not shown, wall vertical reinforcements are installed between the columns, and horizontal wall reinforcements are placed along the wall vertical reinforcements and the column main reinforcements and fixed with binding wires, completing one step of the reinforcement work. .

[Problem that the invention seeks to solve]

In such a conventional method of arranging column reinforcements, the main column reinforcements 5 are arranged one by one, resulting in very poor work efficiency. In addition, since the reinforcing bars are lifted and arranged one by one using a large crane, the crane operation efficiency is poor and the lifting cost increases. Furthermore, the labor burden on reinforcing bar workers is large, and the shortage of skilled workers causes problems in securing labor, which also poses safety problems.

In addition, so-called prefabrication, in which reinforcing bars are assembled on the ground in advance, can be considered, but especially in the case of large-diameter reinforcing bars, each piece weighs a lot, which poses problems in terms of ease of assembly and stability when lifting assembled objects. In addition, there is a risk that the degree of freedom to rotate or push/pull the reinforcing bars when joining after hanging, which is required for Locknand joints using threaded reinforcing bars, may be lost.

The purpose of the present invention is to eliminate the disadvantages of the conventional example, to enable easy pre-assembly on the ground, to be able to erect the assembled structure at once in a stable state, and to allow reinforcing bars to be freely connected when joining screw-shaped reinforcing bars. The purpose of the present invention is to provide a construction method for pre-assembling column reinforcements that can ensure high strength.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention arranges frame plates having through-holes at the spacing of reinforcing bars in an upright manner on a pedestal, and penetrates the frame plates with column main reinforcements made of threaded reinforcing bars and screws them into the column main reinforcements. In addition, the hoop reinforcement is wound around the column main reinforcement several times as appropriate, and a rod-shaped fixing material is attached to the hoop reinforcement to bind the joints. The gist of this is to bundle at arbitrary pitch intervals.

[Effect]

According to the present invention, the column main reinforcing bars can be assembled by simply inserting them into the framework plate, and since the split nuts are used to lock the two together, the nuts can be easily and quickly attached without rotational movement. In addition, since the column main reinforcement is assembled with the above-mentioned frame plate, it maintains a highly rigid and stable state during lifting and after erection, and since the hoop reinforcement and column main reinforcement are not all tied together, the column main reinforcement It can be rotated, pushed and pulled.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view showing one embodiment of the column reinforcement construction method of the present invention, and 9 in the figure shows a frame in which two H-shaped steels are arranged side by side.

On the upper surface of the pedestal 9, two H-shaped support members 9a made of upright angle members and connected at the center with long bolts are provided with a width spaced apart to accommodate a framework plate 10, which will be described later. A suitable number (three in the illustration) are arranged in parallel on the ground at different intervals, and the lower part is fixed to the floor with bolts or the like.

In addition, the flat plate 1 is placed in the gap formed by the support member 9a of the frame 9.
0a into a rectangular shape and fixed with diagonal bars 10b, the frame 10 is inserted and temporarily fixed with bolts, etc., but this frame 10 serves as a gauge plate and a fixing plate for the column reinforcement. Through-holes 10c are formed in advance at reinforcement intervals.

In this way, the frame plates 10 having the through holes 10c are arranged in an upright state by the frame 9, and the main column reinforcements 5 are laid horizontally and are successively penetrated between the frame plates 10 via the through holes 10c.

Once a predetermined number of column main reinforcements 5 are attached to the framework plate 10, lock nuts are attached to the points of the column main reinforcements 5 that protrude through the plate 1o when lifting the framework plate 1.
0 from the column main reinforcement 5, this lock nut has a lock nut part 11a that is divided into two parts as shown in Fig. 5, one part is connected with a hinge 11b, and the other part is fixed with a bolt nut l-11C. Warikuchi Tsuknaft 1
1 was used, and as shown in FIG. 6, one end of the column main reinforcement 5 was screwed from the outside into contact with the framework plate 10.

Note that this split lock nut 11 is attached to the assembled column main reinforcement 5.
It is used to lock the main column reinforcements 5 and the frame plate 10 so that they do not shift even if they become vertical when lifting a column, etc., and the installation position is in the middle of the main column reinforcements 5 (especially the column main reinforcements 5 at the four corners). The opening plate 11 is set so as to be on the lower side of the frame plate 10 when it is held vertically. Then, on only one of the frame plates 10 located at the end, split lock nuts 11 are attached to both sides of all the column main reinforcements 5, so that the frame plate 10 is sandwiched between the split lock nuts 11 and firmly fixed to the column main reinforcements 5. I made it.

As the next step, the hoop reinforcements 12 are wound around the column main reinforcements 5 assembled with the framework plates 10 by a predetermined amount and at predetermined intervals. Then, rod-shaped fixing members 13 made of small-diameter reinforcing bars or the like are attached beside the many wound hoop reinforcements 12, and each hoop reinforcement 12 and the rod-shaped fixing members 13 are tied together with binding wires 14, respectively.

On the other hand, the column main reinforcements 5 and the hoop reinforcements 12 were bound together using binding *I4 except for the column main reinforcements 5 located at the four corners, and only the hoop reinforcements 12 at arbitrary pitches. It is assumed that the column main reinforcements 5 and the hoop reinforcements 12 at the four corners are not tied together at all.

This completes the pre-assembly of the main column reinforcement according to the present invention, but the wires 1 are attached to both sides of the column unit A completed in this way.
5 and attach the lifting crane parent hook 16a to one side.
If the child hook 16b is hooked to the other end to release the lock between the support member 9a of the pedestal 9 and the frame plate 10, and the whole is lifted, the frame plate 10 will be pulled out from the gap between the support members 9a, as shown in FIG. It hangs vertically as shown.

At this time, the shape and rigidity of unit A itself is maintained by the framework plate 10, and as mentioned earlier, the split lock nuts sandwich the framework plate 10 from both sides or are located on the bottom surface, so they are sufficiently locked. The plate 10 will not slip off from the main reinforcing bar 5.

Further, the hoop reinforcements 12 are connected to each other by a rod-shaped fixing member 13, and one end of the hoop reinforcement 12 is fixed to the column main reinforcement 5 with a binding wire 14, so that the hoop reinforcements 12 are not deviated from the column main reinforcement 5 when suspended. It doesn't fall.

Then, as shown in FIG. 8, once the differential reinforcement 3 has been erected to a predetermined position, a lock-Nand joint is performed using the joint member 2 formed by the lock nut 2a and the tumbler 2b as described above.At this time, the column main reinforcement 5 is connected to the hoop. Since it is not tied to all of the reinforcing bars 12, but only to the minimum required portions, it is given a degree of freedom in pushing, pulling, rotation, etc., and can be smoothly joined to the reinforcing bars 3. When carrying out such work, the split lock nut 11 may be removed if necessary, but this can also be done easily and quickly from the scaffolding or the like.

[Effects of the Invention] As described above, the pre-assembly method of column reinforcement of the present invention can
When assembling a column unit with threaded reinforcement as the main column reinforcement on the ground in order to save labor and increase stability,
It can be assembled easily and accurately, and the assembled column unit maintains a stable condition even when lifted, and also allows for flexibility in the column main reinforcement when joining with lock nuts, streamlining construction overall. It is possible to achieve this goal.

[Brief explanation of drawings]

Fig. 1 is a side view showing one embodiment of the pillar reinforcement method of the present invention, Fig. 2 is a side view of Fig. 1, Fig. 3 is a sectional view taken along line A-A of the above, and Fig. 4 is B of the same. -B sectional view, FIG. 5 is a perspective view of the split lock nut, FIG. 6 is a side view showing the installed state of the split lock nut, FIG. 7 is a front view of the column unit according to the present invention when it is lifted, and FIG. FIG. 9 is a front view of the lock nut joint, FIG. 10 is a partially cutaway front view of the same, and FIG. 11 is a side view of a conventional example. 1... Threaded reinforcing bar 2... Joint member 2a...
Lock nut 2b... Coupler 3... Differential bar
4...Temporary steel frame 5...Column main reinforcement
6... Column bar support 7... Hoop bar 8...
Scaffolding 9... Frame 9a... Supporting member 10
...Frame plate 10a...Flat plate 10b...
Bar 10c...Through hole 11...Split lock nut lla...Lock nut portion 11b...Hinge 11c...Bolt nut 12...Hoop muscle 13...Bar-shaped fixing material 14...Binding wire
15... Sling is wire 16a... Crane parent hook 16b... Crane child hook A... Pillar unit

Claims (1)

[Claims] Frame plates having through-holes at the spacing between the reinforcements are arranged upright on a frame, and the column main reinforcement made of threaded reinforcement is passed through the frame plate and locked with a split lock nut that is screwed onto the column main reinforcement, and a hoop is attached to the column main reinforcement. The reinforcing bars are wound around an appropriate number of times, and a bar-shaped fixing material is attached to the hoop reinforcing bars to bind the joints, while the main pillar reinforcing bars and the hoop reinforcing bars are tied at arbitrary pitch intervals except for the main reinforcing bars at the four corners. A pre-assembled construction method for column reinforcements.