JPS6056867B2 - Connection auxiliary device for deformed bars for reinforcing bars - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection auxiliary device used when butting and connecting deformed bars for reinforcing bars.

By the way, when irregularly shaped bars with protrusions called runs formed on their surfaces are butt-connected at a reinforcing bar construction site, they are split into two along the axial direction so that they can be joined together while facing each other during use. Shape fittings may be used.

In order to obtain sufficient connection strength against tensile loads in the axial direction, a joint with such a shape has two parts facing each other.
A concave groove is formed on the inner surface of each of the individual joint constituent members to engage with the protrusion on the surface of the bar mentioned above, but the shape matches the protrusion on the bar to be connected. By preparing a bar having grooves formed therein, it can be applied to any of various irregularly shaped bars having different shapes of protrusions, and therefore has the advantage of being applicable to a wide range of objects.
However, when using this joint, while keeping the two irregularly shaped bars in a butt state, the two joint constituent members should be placed facing each other with the butt point sandwiched from both sides, and each member should be Since the grooves on the inner surface must be properly engaged with the protrusions on the surface of each bar, and the two members must be integrated by an appropriate coupling means, the work of connecting irregularly shaped bars becomes very complicated. There are some drawbacks.

In particular, one irregularly shaped bar is usually fixed in advance by hardening with concrete, etc., while the other irregularly shaped bar is supported to withstand the weight of the other irregularly shaped bar, and the two bars are held in a butt state. Moving the latter bar forward and backward in the axial direction in order to properly engage the protrusions with the grooves of each joint component requires a great deal of effort and careful attention, making the above connection work even more difficult. I'm making it into something. The present invention
In order to deal with the above-mentioned conventional problems associated with butt connection of irregularly shaped bars for reinforcing bars, it is an object of the present invention to provide a connection auxiliary device that can easily realize the connection at a reinforcing bar construction site.

That is, the device according to the present invention can easily advance and retreat an irregularly shaped bar in the axial direction with respect to one irregularly shaped bar fixed with concrete or the like while supporting the weight of the other irregularly shaped bar. A set of joint components is configured so that it can be temporarily held along the connecting ends of both irregularly shaped bars. Hereinafter, an embodiment shown in the drawings will be described in detail. In the figure, 1 and 2 are deformed bars for reinforcing bars that are butt-connected.

Projections 1a and 2a, called edges, are formed on each surface of both bars 1 and 2 at a constant pitch in the axial direction. These protrusions 1a, 2a may be formed in a continuous annular shape in the circumferential direction as shown in the figure, or may be formed in a shape shifted in the axial direction by half a pitch difference every half circumference. Alternatively, it may be formed into a male screw shape that continues spirally in the axial direction. Of these two bars, one bar 1 is fixed in advance by hardening with concrete 3 or using other means. One end of the other bar 2 is butt-connected to the tip of the bar 1 so as to be continuous in the axial direction using the following joint. In other words, this joint is a set of two pieces shaped like an entire axially long cylindrical joint divided into two along the axial direction. It is assumed that the joint component members 4 and 5 are integrally connected facing each other during use. On the inner surfaces of these two members 4 and 5, there are provided protrusions 1a and 2a of both bars.
Concave grooves 4a, 5a having a shape that matches the ridges are formed in the same arrangement as each of the protrusions. Both such members 4,
Numeral 5 is a fastener 6 which is provided with a suitable connecting means such as a U-shaped bolt 6a and a retaining plate 6b, and is placed opposite to each connecting end of the rods 1 and 2 which are butted against each other. etc., to combine and integrate them. However, the apparatus according to the present invention is configured as follows with respect to the above-mentioned irregularly shaped bars 1 and 2 and both joint components 4 and 5. That is, reference numeral 7 is a telescopic support column, which is composed of an outer cylinder 8 and a movable shaft 9 slidably inserted into the outer cylinder 8, and the latter is slidable only in the axial direction within a required range with respect to the former. For example, the support 7 is restrained by an axial slit 10 provided in the latter and a pin 11 engaged with the slit from the former. In this case, it is assumed that appropriate measures have been taken to make it easy to expand and contract and to maintain the required length. The operating ring 13 for raising and lowering the movable shaft screwed onto the screw portion is brought into contact with the upper end surface of the outer cylinder 8, and if necessary, a small hole 15 into which the rod handle 14 is inserted is provided. Several pieces of the above-mentioned odd-shaped rods may be scattered on the outer peripheral surface of the operation ring.At both ends of the column 7, that is, the lower end of the outer cylinder 8 and the upper end of the movable shaft 9, It is assumed that means are provided for individually capturing the materials 1 and 2, and therefore, in the illustrated example, the bar material clamps 16, 17 consisting of forked clamp pieces 16a, 16b or 17a, 17b are Each clamp is provided at the lower end of the cylinder 8 and the upper end of the movable shaft 9, and the odd-shaped bar 1 or 2 is fixed between one clamp piece 16a, 17a of each clamp and the other clamp piece 16b, 17b facing each other. a set screw 18 for clamping the
19 is screwed in. Further, in the middle of the support column 7, there is provided a means for temporarily holding the above-mentioned joint components 4 and 5 attached to the connecting ends of both the odd-shaped bars 1 and 2 in that state. Therefore, in the illustrated example, the joint holder 20 consisting of a pair of holder arms 20a, 20b facing each other supports the proximal end of each arm 20a, 20b at an approximately intermediate position between the bar clamps 16, 17. axis 2
1a and 21b are pivotally attached to the side surface of the outer cylinder 8, and each of these arms 20a and 20b can be opened and closed using the respective support shafts 21a and 21b as a fulcrum, and both joint component members 4 , 5 are biased by a suitable spring 22 in the direction of closing the ends. The connection auxiliary device configured as described above is used in the following manner when butting and connecting the irregularly shaped bars 1 and 2.

First, the whole device is attached to the support 7, which is the odd-shaped bar 1 that is fixed and supported by hardening it with concrete 3.
You can install it by making it parallel to each other. This installation is
While being careful to position the joint holder 20 at the upper end of the bar 1, that is, near the connecting end, move the bar clamp 16 provided at the lower end of the support 7 to a location below the connecting end of the bar 1. This is done by fitting and tightening the setscrew 18 to securely clamp the bar between the two clamp pieces 16a, 16b. Next, the other irregularly shaped bar 2
Connect the bar 2 while keeping it on the same center line as the bar 1, taking care that its lower end, i.e. the connecting end, butts against the connecting end of the bar 1 in the joint holder 20. A portion above the end is fitted into a bar clamp 17 provided at the upper end of the support column 7, and a set screw 19 is tightened to securely clamp the bar 2 between the clamp pieces 17a and 17b.

At this time, if the connecting end of the bar 2 is placed on the connecting end of the bar 1, the weight of the bar 2 will be supported by the bar 1, so the bar 2 will be held between the bar clamps 17. Work becomes easier. In this way, both the irregularly shaped bars 1 and 2 are kept abutted against each other on the same center line by the support 7 and the bar clamps 16 and 17 at both the upper and lower ends. Also, the connecting ends of both bars 1 and 2 that are butted against each other are connected to the joint holder 2.
It is located within 0. Next, a set of two joint components 4, 5 are attached to each connecting end of both bars 1, 2 so as to be sandwiched therebetween from both sides.

The joining of both members 4 and 5 is carried out by pushing each member from the side between both bars 1 and 2 and Holter arm 20a or 20b. At this time, the holder arms 20a and 20b are rotated backward about the respective support shafts 21a and 21b in the direction of widening the opening between them, but a spring 2 is inserted between these two arms.
2 is acting, it immediately attempts to return to rotation in the direction of narrowing the opening. Therefore, the joint components 4 and 5 attached to each connecting end of both bars 1 and 2 are elastically pressurized by the holder arms 20a and 20b, and are temporarily held in the attached state. . Grooves 4a and 5a are formed on the inner surfaces of the joint components 4 and 5 to be engaged with the protrusions 1a and 2a on the surfaces of the bars 1 and 2, respectively.

These concave grooves 4a, 5a and protrusions 1a, 2a are not necessarily engaged immediately just by attaching the above-mentioned members 4, 5 to the connecting ends of both bars 1, 2, and in many cases. , protrusions 1a, 2
Even if it can be engaged with either one of a, it is usual that it cannot be engaged with the other due to positional deviation. In order to correct this inconvenience, each groove 4a, 5a is replaced with a protrusion 1a.
, 2a, the bar 2
is slightly moved in the axial direction relative to the bar 1.

That is, when the operating ring 13 screwed onto the male threaded portion 12 of the movable shaft 9 in the strut 7 is turned, the movable shaft 9 slides in the axial direction with respect to the outer cylinder 8, thereby changing the length of the strut 7. Therefore, while the weight of the bar 2 is supported by the support 7, it is moved in the axial direction by the support 7. Therefore, the protrusions 1a, 2
The concave groove 4a, which was engaged only with either one of a.
5a can be correctly and easily engaged with the other one as well. After that, the fastener 6 as shown in the illustration is
When the two joint constituent members 4, 5 are joined and integrated facing each other using, for example, the connecting ends of the two irregularly shaped bars 1, 2 are tightly hugged by the two members 4, 5 as shown in the figure. They are butt-connected so as to exhibit sufficient connection strength against a load in the bending direction, and also exhibit sufficient connection strength against a tensile load in the axial direction.

After completing the connection of the deformed bars 1 and 2 in this manner, the entire device is removed and reused in the same manner at the next connection point. As described above, the connection auxiliary device according to the present invention is a halved joint consisting of a set of two joint components facing each other, and when connecting two irregularly shaped bars by butting them together, While maintaining the abutted state, one irregularly shaped bar can be moved forward and backward in the axial direction while withstanding the weight of the other irregularly shaped bar, and the above-mentioned two joint components can be connected to each other. Since it is configured so that it can be temporarily held in a state along the end, when using the device according to the present invention, it is possible to butt connect irregularly shaped bars using a two-split joint. Easily and accurately with the effort of
However, it can be carried out quickly, and the complexity of the connection work seen in the past can be greatly improved. Therefore, such connections of irregularly shaped bars can be easily realized at reinforcing bar construction sites. You can expect the results to be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a partially cutaway side view, and FIG. 3 is A of FIG. 1.
4 is a sectional view taken along line B-B, and FIG. 5 is a sectional view taken along line C-C.

1, 2... Deformed bar material, 4, 5... Joint component, 7... Support column, 8... Outer cylinder,
9...Movable axis, 12...Male thread part, 13
......Operation ring, 16, 17... Bar clamp, 18, 19... Set screw, 20... Joint holder, 20a, 20b... Holder arm, 22... Spring.

Claims (1)

[Scope of Claims] 1. A support that can be expanded and contracted, and upper and lower bar capturing means provided at both ends of the support for individually capturing two irregularly shaped bars to be butt-connected in their abutting state. and a joint temporary holding means provided in the middle of the pillar for temporarily holding the two-split joint along the connecting ends of the two irregularly shaped bars. A special feature of this is an auxiliary device for connecting irregularly shaped reinforcing bars. 2 The strut consists of an outer cylinder and a movable shaft inserted into the outer cylinder so as to be able to slide freely in the axial direction, and is screwed into a male threaded part formed on the movable shaft and abuts against one end surface of the outer cylinder. 2. The connection auxiliary device according to claim 1, wherein the movable shaft can be moved in a direction that changes the length of the support column by means of a contacting operation ring. 3. Each of the bar catching means provided at both the upper and lower ends of the column is composed of a bifurcated bar clamp, and is configured to fixedly clamp each odd-shaped bar at a point slightly away from the connecting end. A connection auxiliary device according to claim 1, characterized in that: 4. The joint temporary holding means provided in the middle of the column consists of a joint holder consisting of a pair of holder arms that can be opened and closed, and these holder arms are configured to elastically hold a pair of joint constituent members. The connection auxiliary device according to claim 1, wherein the connection auxiliary device is energized.