JPS6044473B2 - Connection method of main beam reinforcement for extension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus designed to facilitate construction when connecting main reinforcing bars for an extension beam to reinforcing bars in an existing reinforced concrete column.

When extending a reinforced concrete structure, when connecting the reinforcing bars on the existing column side and the main beam reinforcement for the extension, the conventional construction method is used when constructing the same structure, and in the case of future extensions, it is expected that the main reinforcement for the extension beam will be connected. At the site, the main beam reinforcement of the existing beam that goes into the same column was lengthened in advance, and then bent and buried inside the column.When building an extension, the concrete for the column was first poured and buried. The anchored part of the beam main reinforcement is bent back straight, and the beam main reinforcement for extension is connected to this anchored reinforcement using lap joints, gas pressure welding joints, etc., but in this conventional construction method, the concrete is not removed during the extension, and the bent beam main reinforcement is connected to the anchored reinforcement. Overall work such as straightening and cleaning takes time and effort, and there are many problems if the construction takes a long time.

The present invention has been made in order to solve the problems with these conventional construction methods, and it facilitates the fixation of joints of main reinforcement beams for extensions in parts of reinforced concrete structures where extensions are expected in the future. When repairing half of a civil engineering structure (particularly a floor slab, etc.) due to usage restrictions, it is easier to fix joints such as main reinforcing bars that span the boundary line, and it is also easier to fix than conventional construction methods. In addition, we have made it possible to significantly reduce costs by speeding up and increasing the efficiency of the overall work by simplifying the construction time.Furthermore, we have improved the reliability of the structural strength of the extension, and we have also improved the construction method using prefabricated reinforcing bars. In order to be able to effectively utilize general mechanical joints and anchoring methods in
It is designed to facilitate extensions and to ensure the specified strength of the reinforcing steel structure, and its feature is that when connecting the main beam reinforcement for extension to the threaded main reinforcement, the fixing plate on the connection side is installed in advance. Next, the already poured concrete is poured, and then the connecting coupler is connected to the threaded beam main reinforcement, and
This is at the point where the main reinforcing beam for extension is connected to the coupler.

The present invention will be described in detail below based on the illustrated embodiments.
The figure shows an example of the previously mentioned conventional general reinforcing bar joint structure for extensions, Fig. 2 shows an example of the construction method according to the present invention, and Fig. 3 shows a conventional joint using threaded reinforcing bars and a coupler. Although the anchorage method is shown as an example, the conventional construction method shown in Figure 1
Existing pillar 11 made of reinforced concrete structure etc. as shown in the diagram
In addition, in the beam 12 that is extended from the column 11, the reinforcing bar 13 on the beam side is lengthened in advance at the location where the extension is expected in the future, and the bent portion 13 is extended during concrete construction.
A, 13a are buried in concrete, and at the time of expansion, the existing concrete is suspended like a hanging part 11a so that the bent parts 13a, 13a are exposed.
Stretch it straight like 13b and connect it to the connection part 13b,1
As 3b, by lap joint means or gas pressure joint means,
This means that the reinforcement beams for the extension (not shown) are connected continuously.
It is very time-consuming and complicated construction work such as straightening a and cleaning the connecting portions 13b, 13b.

The present invention uses a connection method as illustrated in FIG. 2 1, ■, ■. In FIG. 1 indicates a threaded beam main reinforcement on the beam 12 side, and 5 indicates a threaded column main reinforcement on the column 11 side, but in the present invention, a threaded beam main reinforcement is attached to the column main reinforcement 5 side on the column 11 side. 1 are orthogonally connected, as shown in the figure, the threaded beam main reinforcements 1, 1 are shown on the fixing plates 4, 4 made of belt-shaped plates fixed in advance by welding etc. between the opposing column main reinforcements 1, 1. Although omitted, the lock nuts 2, 2'', 2'' are inserted through the mounting holes drilled in the fixing plates 4, 4, and screwed using the screws of the threaded beam main reinforcement 1. This is done by fastening and fixing them to form an integrated structure. On one predicted side 11a side, two lock nuts 2'', 2'' are used inside and outside with the fixing plate 4 in between, and one lock nut 2 is used on the other side.

In this way, the column main reinforcements 5 and the beam main reinforcements 1 are orthogonally connected and integrated, and the columns 11 and beams 12 are integrally constructed by pouring concrete in a predetermined manner. In this example, since it is a cross-sectional plan view, only two main beam reinforcements 1 with screws are shown, but this is because there are four beams vertically parallel to each other, just as there are four column reinforcements 5 of the column 11. There is a main reinforcing bar 1, and therefore there is another set of anchoring structures made up of the anchoring plates 4, 4 and lock nuts 2, 2', 2'' either above or below the figure in the vertical direction. The example shows only two main beam reinforcements 1, 1 on the upper or lower side.In addition, in Fig. 1, X indicates the existing side of the reinforced concrete structure made of columns 11 and beams 12, and Y indicates the extension side. In this way, when assembling the threaded main beam reinforcing bars 2 on the beam side to the main column reinforcing bars 1 on the column side, the threaded main reinforcing bars 1 on the side surface 11a of the column 11 are If the length of the remaining end 1a extending from the fixing plate 4 cannot be long and the remaining end 1a'' is too short, the present invention makes the connection as shown in FIG. That is, as shown in the figure, the pillar 1 that is in contact with the extension side Y where this extra insertion end 1a exists
On the side surface 11a of 1, the concrete on the side surface 11a is removed so that the fixing plate 4 is exposed, and 1a'' indicates the exposed part.In this way, the fixing plate 4 and the lock nut 2'' are exposed. After letting it out, remove the same nut 2'', clean the remaining insertion end 1a to some extent, and attach the connecting coupler 3.
into the remaining end 1a, screw one end of the threaded beam main reinforcement 1'' for extension into the other half of the coupler 3 through the lock nut 2'', and introduce torque to the coupler 3 lock nut 2'' by screw tightening means. The main beam reinforcements 1 and 1'' are fixed at the base, and the main beam reinforcements 1 and 1'' are integrated, and at the same time, the concrete pouring of the extension beam 12'' with the main beam reinforcement 1'' as the skeleton on the extension side Y is achieved. In addition, as illustrated in (■) in the same figure, when the length of the extra insertion end 1a of the beam main reinforcement 1 in the anchor plate 4 on the side surface 11a facing the extension side Y of the existing column 1 can be longer than that in Figure I. , concrete is poured until the fixing plate 4 lock nut 2'' is exposed together with the extra insertion end 1a, and the lock nut 2'' on the outside of the fixing plate 4 and the extra insertion end 1a are exposed.
Leave it as it is, and after cleaning the extra end 1a a little, remove the extra end 1a.
By screwing the coupler 3 into a, using a new lock nut 2, screwing the main threaded beam reinforcement 1'' for extension into the coupler 3, and tightening the screws into these nuts 2 and coupler 3 while applying torque, The beam main reinforcements 1 and 1'' are integrated to obtain the beam 12'' on the extension side.

According to the method of employing the threaded beam main reinforcement 1 of the present invention, fixing the beam main reinforcement 1 with the fixing plate 4, suspending the concrete on the extension side Y, and the connection method using the lock nuts 2, 2'', 2'' and couplers. Compared to the conventional method of bending and burying beam reinforcing bars illustrated in Figure 1, complicated operations such as bending and burying beam main reinforcements 1 and bending back the beam main reinforcements 1 by lifting the concrete can be completely omitted, and the column main reinforcements 5 side By using the fixing plate male lock nuts 2, 2'', 2'' fixed in advance on the anchor plate and the connecting coupler 3, the amount of concrete is reduced, and only the screwing of the coupler 3 lock nuts 2, 2'' is required. It is extremely easy to construct and can be processed quickly.At this time, the concrete thickness at the column 1 and the extra insertion end 1a of the beam main reinforcement 1 that protrudes outside the anchoring plate 4 relative to it.
Depending on the length, it is possible to attach it in both ways as shown in Figure 2 ■ and ■, and by using the coupler 3, there is no need to make the length of the remaining insertion end 1a particularly long as in the conventional case. Therefore, it can be applied very easily to areas where expansion is expected in the future, and the strength of the main bars 1 and 1" of the continuous beam can be easily increased by screwing the coupler 3 nut 2" or 2. Torque has been introduced, and axial force has been reliably applied to the joint.
It is possible to have a rigidity equal to or higher than that of the base material, and therefore, the structural strength of the extension part is highly reliable, and there is no anxiety at all at the boundary between the existing part and the extension part, and the construction The ease of construction and shortened construction period can be expected to lead to significant cost reductions. It is known that a connecting means as shown in FIG. 3 is conventionally used as such an integrated structure for connecting columns and beams using threaded reinforcing bars. That is, in a column 11 having a reinforced concrete structure and beams 12, 12 provided on the left and right sides of the column, in the column-side reinforcing frame made up of the threaded column main reinforcements 5, the fixing plates 4, 4 are connected to the column main reinforcements 5, . A fixing bar 6 is installed in advance between the fixing plates 4 and 5, and lock nuts 2, 2 are used so that both ends thereof protrude a considerable length from the outside of the fixing plate 4 and further from the beam-side side surface of the pillar 11. The fixing bars 6 and the threaded beam main bars 7 are connected and integrated using the coupler 3 and the lock nuts 2, 2. This method requires the anchoring bars 6, and since they protrude significantly longer than the four anchoring plate columns 11, the remaining ends of the anchoring bars should be bent in advance and buried in areas where extensions are expected in the future. It is difficult to mount it, and even if it were buried, the result would be the same as the conventional method shown in Fig. 1, and there is always a joint part with a pair of left and right couplers 3, 3, which requires more effort. Moreover, the large number of joints also raises concerns about the rigidity of the base material over the entire length of the assembled reinforcing bars. On the other hand, in the present invention, the joint part can be located at only one place, and can be located near the fixing plate, and the number of joint fixing parts (coupler, nut) can be reduced.
Construction is easier, and the fewer joints are advantageous in terms of rigidity and structural strength over the entire length of the reinforcing bar base material, and the amount of work required for on-site shear reinforcing bars at joints is also reduced.
The present invention can be said to be particularly excellent as a connection method for areas where extensions are expected.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the conventional connection method, FIG. 2 is an explanatory diagram of an embodiment of the connection method of the present invention, and FIG. 3 is an explanatory diagram of an example of a column-beam connection structure using conventional assembled reinforcing bars. 1... Threaded beam main reinforcement, 2, 2'', 2''...
...Lock nut, 3... Connection coupler, 4
...Fixing plate, 5...Column main reinforcement, 1"...
...Main reinforcement with screws on the extension side, 11...Column, 12.
...beam.

Claims (1)

[Claims] 1. When connecting the main reinforcing beam for expansion to the main reinforcing beam for threaded beams, first lift the already cast concrete up to the fixing plate on the connection side, then connect the connecting coupler to the main reinforcing beam for threaded beam, and connect the main reinforcing beam for extension to the coupler. A method for connecting beam main reinforcements for extensions, which is characterized by connecting the main reinforcements.