JPS6018496Y2 - Lap joint of threaded reinforcing bars - Google Patents

Description

[Detailed description of the invention] The present invention aims at ease of construction when connecting two threaded reinforcing bars, enables shortening of the joint part as much as possible, and improves the toughness of the joint. The present invention relates to the provision of a new overlapping type joint with improved reliability.

In threaded reinforcing bars used as skeletal reinforcement materials for concrete structures, a butt-fixed joint between the two reinforcing bars is used to connect the reinforcing bars together.

In other words, Fig. 1 illustrates three commonly used methods, and Fig. I shows a lock nut tightening joint;
As shown in the figure, connect two threaded reinforcing bars 1.1 to a common joint main cylinder 2.
The main cylinder 2 has a butt-like shape, and at both end positions of the main cylinder 2,
It is integrated with lock nut 3.3,
3 is a screw coupler crimp joint, as shown in the figure, two screw reinforcing bars 1, 1 are butted together in a screw coupler 4, and the coupler 4 is crimped to fix and integrate them. ■ in the same figure is a resin-filled joint, and as shown in the figure, two threaded reinforcing bars 1.1 are butt-shaped inside the joint main cylinder 5,
A resin material 7 is injected into the main cylinder 5 through a resin injection hole 6 and then fixed and integrated.

In each of these figures, the threaded reinforcing bar 1 includes either a thread formed only at the end or a thread formed over the entire length, but in any case, in this butt joint type, the threaded reinforcing bar 1 includes two
It is necessary to match both axes of the screw reinforcing bars 1 and 1, and also to match each thread pitch.In the threaded coupler crimp joint shown in Figure ■, pressure is applied using a crimping device to increase the rigidity of the joint part. The construction is quite difficult and complicated, such as the need for post-construction, and in particular, the screw reinforcing bar 1 is a part of a group of reinforcing bars in a pre-assembled frame cylinder, such as a reinforcing bar assembly column or beam. If so, their mutual succession is even more troublesome.

On the other hand, for deformed reinforcing bars other than threaded reinforcing bars, a lap joint method is adopted in which two reinforcing bars are overlapped at the continuous joint part and fixed and integrated. It is widely used because it is easy to construct and is economical.

However, it is also known that this lap joint method is, in principle, not approved for reinforcing bars whose diameter is larger than D29.

The present invention was developed against the background of these conventional reinforcing bar joint techniques, and employs a lap joint method that is particularly easy to work with as a joint for threaded reinforcing bars, and is also applicable to threaded reinforcing bars of D29 or higher. In order to provide a new joint structure that takes advantage of the characteristics of threaded reinforcing bars, the feature is that two threaded reinforcing bars are connected by stacking them in parallel, and a screw hole into which the reinforcing bars can be screwed is provided. , connecting fittings in which through-holes having an inner diameter larger than the outer diameter of the reinforcing bars are formed in parallel above and below the main body of the fitting are respectively arranged at both ends of the parallel overlapping portions of the two reinforcing bars, and one screw is inserted into the screw hole. At the same time as the reinforcing bar is screwed into the through hole, the other threaded reinforcing bar is inserted into the through hole, and a lock nut is screwed onto the threaded reinforcing bar inserted through the through hole to integrate both the reinforcing bars and the connecting fitting.

The present invention will be described in detail below based on the illustrated embodiment. Fig. 2 shows the main parts of the embodiment of the invention, Fig. 3 shows the construction order, and Figs. 4 to 6 show the main parts of the embodiment of the invention. Although a modified example is shown, in Fig. 2, 1.1 indicates two threaded reinforcing bars to be connected, and these threaded reinforcing bars 1, 1 may have threads formed over their entire length. The same effect can be achieved even if a thread is formed over the required length only at the continuous end.

Reference numeral 8°8 denotes a connecting fitting used in the present invention, and the block-shaped fitting 8 has screw holes 8a and 1.8 which are screwed together with the screws of the threaded reinforcing bars 1, 1. Both of the through holes 8b having an inner diameter larger than the outer diameter of the threaded reinforcing bars 1 and 1 are provided in parallel, and 9 and 9 are provided with one of the threaded reinforcing bars 1 for fastening.
It is a lock nut that is screwed onto the side.

The continuous connection of the two threaded reinforcing bars 1, 1 shown in FIG. 2 using the connecting fitting 8 and lock nut 9.9 of the present invention is performed as follows.

That is, as shown in the procedure as Figure 3 I, II, I,
First, as shown in ■, connect the connecting fittings 8, 8 to the end 1' of the lower threaded reinforcing bar 1 to be connected, and insert the respective screw holes 8a, 8a.
The metal fittings 8, 8 are screwed together using
It is preferable that the length of the threaded reinforcing bar 1 is greater than or equal to ICki, where d is the outer diameter of the threaded reinforcing bar 1.

For the threaded reinforcing bar 1 to which the connecting fittings 8, 8 are fixed in this way, a lock nut 9 is screwed in advance onto the end 1' of the other threaded reinforcing bar 1 (the upper side in I in the figure) as shown in the figure. Then, as shown in the same figure (■), attach the threaded reinforcing bar 1 with the lock nut 9 attached to the other threaded reinforcing bar 1.
The lock nut 9 is inserted in a penetrating manner across the through holes 8b, 8b in the connecting fittings 8, 8, and the lock nut 9 is fitted so as to contact and support one of the connecting fittings 8 corresponding to the nut 9,
Next, as shown by ■ in the figure, another lock nut 9 is screwed onto the end of the threaded reinforcing bar 1 that protrudes from the other connecting fitting 8, and is tightened and crimped onto the side of the other connecting fitting 8, thereby tightening both screws. As shown in the second figure, the reinforcing bars 1, 1 have their ends 1', 1' integrated in parallel with metal fittings 8, 8, and nuts 9, 9 to form a lap joint.

The examples shown in FIGS. 4 to 6 are modified embodiments, and in the embodiment shown in FIG. The plate 11 is fixed to the nut 10 by welding or the like and has a through hole 8b.In this case, when forming the lap joint, double-threaded reinforcing bars are used as shown in the figure. Attach each nut 10 of the connecting fittings 8, 8 to the ends i', i' of 1, 1, respectively, through the screw holes 8a, 8a (however, the directions of both fittings 8, 8 are opposite), and each of the mating fittings 8. , 8 through holes 8 in each plate 11.11
One end of each reinforcing bar 1', 1' is inserted through b, 8b, and a pair of lock nuts 9, 9 are tightened and clamped on both sides of both plates 11°11. At this time, one of the lock nuts 9 is screwed onto the respective reinforcing bar ends 1', 1' before penetration), and the two metal fittings 8, 8 are placed in opposite directions on the two reinforcing bars 1, 1. This is done in consideration of the use of two lock nuts 9, 9 and the effort of penetrating the end portion 1' into the plate 11, but if the effort is not taken into account, it would be better to connect it to one screw reinforcing bar 1. It is not impossible to set the metal fittings 8, 8 in the same direction, screw the nuts 10.10 together, and insert and fix the other threaded reinforcing bar 1 into the plate 11.11 side.

FIG. 6 shows that it is also possible to connect threaded reinforcing bars 1, 1 in succession using one of the metal fittings 8 of the type shown in FIG.
It is free to attach the nut 10 to which reinforcing bar 1.

Further, in the example shown in FIG. 5, the connecting fitting 8 shown in the second drawing is in the form of a block, and the connecting fitting 8 shown in the fourth drawing is in the form of a nut 1.
0 and the plate 11, the connecting fitting 8
The point is that the plate is completely plate-shaped, and in this case, when tightening and fixing the two metal fittings 1, 1, the lock nuts 9, 9 for each of the two pieces are tightened and fixed on both sides of the plate.

At this time, the two screw holes 8a and through-holes 8b in the metal fitting 8 may be the same as those shown in FIGS. 2 and 4.

Also, although not shown, the threaded reinforcing bar 1.1 in the figure simply shows a free one-piece bar, but as mentioned earlier, this is not applicable to reinforced structures such as assembled reinforced columns and beams. It goes without saying that it can be applied to each of a plurality of constrained threaded reinforcing bars, and can be used between each opposing threaded reinforcing bar when a pair of structures are connected.
Parallel ends 1' of both reinforcing bars 1, 1 in the illustration.

1' (spanning between the metal fittings 8, 8) can also be wrapped with a spiral wire.

According to the present invention, by using the connecting fitting 8 and the lock nut 9 as a joint structure for the threaded reinforcing bars 1, 1, a lap joint structure can be easily obtained, and its construction and workability are extremely good.

That is, the metal fitting 8 is attached to one side of the screw reinforcing bar 1 through the screw hole 8a, and the other screw reinforcing bar 1 is attached to the through hole 8b of the metal fitting 8.
It is enough to loosely insert it into the lock nut 9 and fix it by tightening the lock nut 9, so the work can be done quickly and easily, and unlike the conventional butt type, it is not necessary to match the axes of the threaded reinforcing bars 1.1 or match the thread pitch. This is particularly convenient when the threaded reinforcing bars 1, 1 are constrained to each other and their axes are misaligned.
Since it is a type in which 1' is parallel, it can exhibit sufficient effect when embedded in concrete, and in this case, if the length of L is about lω, the adhesion effect with concrete will be improved. As the skeletal reinforcement of
It does not betray its toughness and reliability, and furthermore, even when the lap joint of the present invention is not embedded in concrete, it can sufficiently transmit force equal to the strength of the lock nut 9, and even when it is not embedded in concrete. In this case, even if the quality of the concrete is poor or deteriorated, the strength of the joint can be maintained and the reliability of the structure can be improved.

In addition, conventional lap joints for deformed reinforcing bars include lap crimp joints, lap joints with reinforcing metal fittings, and wedge-split lap joints, but compared to these conventional types, the required structure can be significantly simplified by using screws, and the required structure can be significantly simplified by using screws. Only the connecting fitting 8 and lock nut 9 are required as parts, which is a great advantage as a joint between threaded reinforcing bars.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an example of a conventional screw reinforcing bar joint, Fig. 2 is a front view of an embodiment of the joint of the present invention, Fig. 3 is an explanatory diagram of the same construction procedure, and Fig. 4.5. FIG. 6 is an explanatory diagram of the modified embodiment. 1...Screw reinforcing bar, 1'...End, 8.
...Connection fittings, 8a...Screw holes, 8b.
...Through hole, 9...Tatsuknut.

Claims (1)

[Scope of utility model registration request] When connecting two threaded reinforcing bars in parallel,
A connecting fitting in which a screw hole into which the reinforcing bar can be screwed and a through hole having an inner diameter larger than the outer diameter of the reinforcing bar are formed in parallel above and below the main body of the fitting is attached to both ends of the parallel overlapping part of the reinforcing bar. At the same time, one threaded reinforcing bar is inserted into the screw hole, and the other threaded reinforcing bar is inserted into the through hole, and a lock nut is screwed onto the threaded reinforcing bar inserted through the through hole to connect both the reinforcing bars and the connecting fitting. A lap joint for threaded reinforcing bars that is characterized by the integration of.