Coupler for connecting reinforcing bars

Abstract

The invention relates to the field of building, and more particularly to detachable couplers for connecting reinforcing bars. A coupler comprises a metal bar having at both ends a tapered opening with a tapered thread that is identical to a thread on tapered ends of a reinforcing bar. Provided inside the metal bar, between said tapered openings, is a compensation belt, the width of which is greater than the total increase in length of the installed reinforcing bars in the event of thermal growth. The technical result is that of ensuring the reliability of a threaded connection between rotatable and / or non-rotatable reinforcing bars.

Description

[0001] COUPLING FOR CONNECTING REINFORCEMENT RODS

[0002] DESCRIPTION

[0003] The utility model relates to devices for connecting reinforcement, in particular to couplings, and can be used in construction for creating reinforcement cages [E04C 5 / 16; E04C 5 / 18].

[0004] A COUPLING FOR CONNECTING REINFORCEMENT RODS is known [RU 133163, published: 10.10.2013], made from a round or hexagonal rod, in which blind conical holes are made at the ends, provided with a thread with a thread profile angle from 50 to 60, characterized in that the internal conical holes are provided with a thread with a taper angle from 2 to 3.8, while at a distance of 0.2-3 mm from the base of the conical hole, the cross-sectional area SM of the coupling is 1.1-2.1 SA, where SA is the cross-sectional area of ​​the joined reinforcement bars, and the area SM determines the diameter of the circumference of the round rod or the diameter of the circle inscribed in the hexagonal rod.

[0005] However, this device has a drawback: it is impossible to reliably connect reinforcement bars when rotation of the connected bars is impossible.

[0006] A COUPLING CONNECTION OF REINFORCEMENT RODS is known [RU 205235, published: 05.07.2021], comprising steel reinforcement bars with external conical threads made at the ends, a steel coupling, at both ends of which an internal conical thread is made corresponding to the conical thread of the reinforcement bars, the angle of the thread profile is from 50° to 60°, and the taper angle is from 2° to 8°, the first part of the length of the internal conical thread, counted from the end of the coupling, has dimensions made with less accuracy, and the subsequent parts of the thread length have dimensions made with greater accuracy. The first part of the length of the internal conical thread, counted from the end of the coupling, is from % to 1 L is the total length of the tapered thread.

[0007] However, this device has a drawback: it is impossible to reliably connect reinforcement bars when rotation of the connected bars is impossible.

[0008] The closest analogue is the COUPLING FOR CONNECTING REINFORCEMENT RODS [RU 189729, published: 31.05.2019], which includes a metal rod, at both ends of which conical holes are made, in which a conical thread is made with a taper angle from 6 ° 12 'to 30 ° with a thread profile angle from 55 ° to 75 °, the length of the conical thread in each hole is in the range of 0.86-1.44 of the nominal diameter of the reinforcing bar. The coupling is made of a metal rod of a round, or hexagonal, or square cross-section. At the ends of the coupling, holes of different diameters are made and conical threads of different diameters are made in them, and the length of the conical thread in each hole is in the range of 0.86-1.44 of the nominal diameter of the corresponding reinforcing bar.

[0009] The main technical problem of the prototype is the impossibility of reliable connection of reinforcement bars when rotation of the connected bars is impossible.

[0010] The technical result of the utility model consists in ensuring the reliability of the threaded connection of rotating and non-rotating reinforcement bars.

[0011] The specified technical result is achieved in that a coupling for connecting reinforcement bars, including a metal bar, at both ends of which conical holes are made, in which a conical thread is made, characterized in that the metal bar is a fastener for a detachable connection with threaded conical ends of the mounted reinforcement bars, wherein the thread in the conical holes of the metal bar is identical to the thread on the conical ends of the reinforcement bars, and between the conical holes in the metal bar a compensation belt is made, the width of which exceeds the total maximum increment in the lengths of the mounted reinforcement bars during their temperature increase.

[0012] In particular, the threads in the conical holes of the metal rod are made with a right or left winding.

[0013] In particular, the thread in one conical hole of the metal rod is made with a right-hand winding, and in the other conical hole with a left-hand winding.

[0014] In particular, the conical holes in the metal rod are made of the same size.

[0015] In particular, the conical holes in the metal rod are made of different sizes.

[0016] In particular, the metal rod is made of a round, square or hexagonal cross-section.

[0017] In particular, an anti-friction coating is applied to the threads in the conical holes of the metal rod.

[0018] In particular, notches are made at the tops of the threads in the conical holes of the metal rod perpendicular to the thread turns.

[0019] Brief description of the drawings.

[0020] Fig. 1 shows a longitudinal section of a coupling for connecting reinforcing bars.

[0021] Fig. 2 shows a longitudinal section of the coupling with connected reinforcement bars.

[0022] Fig. 3 shows a coupling for connecting reinforcing bars of circular cross-section.

[0023] Fig. 4 shows a coupling for connecting reinforcing bars of square cross-section.

[0024] Fig. 5 shows a coupling for connecting reinforcing bars with a hexagonal cross-section.

[0025] Fig. 6 shows a coupling for connecting reinforcing bars with different sized conical holes.

[0026] The figures indicate: 1, 2 - reinforcement bars, 3 - metal rod, 4, 5 - conical holes, 6 - compensation belt.

[0027] Implementation of a utility model.

[0028] A coupling for connecting reinforcement bars is used in cases where rotation of the connected reinforcement bars 1 and 2 is impossible, or rotation of only one of the connected reinforcement bars 1 or 2 is possible, or rotation of all connected reinforcement bars 1 or 2 is possible. For example, reinforcement cages laid in foundation formwork; reinforcement carpets laid on a prepared base for forming a foundation; concrete slabs or blocks; increasing the length of reinforcement bars, etc.

[0029] The coupling for connecting reinforcement bars 1 and 2 (see Fig. 1, Fig. 2) includes a metal bar 3, at both ends of which conical openings 4 and 5 are made, in which a conical thread is made. The metal bar 3 is a fastener of a round (see Fig. 3), or square (see Fig. 4) or hexagonal (see Fig. 5) cross-section for a detachable connection with the threaded conical ends of the mounted reinforcement bars 1 and 2.

[0030] The threads in the conical holes 4 and 5 of the metal rod 3 are identical to the threads on the conical ends of the reinforcement rods 1 and 2.

[0031] If the thread in conical holes 4 and 5 is made with right-hand winding, then at the ends of reinforcement bars 1 and 2 the thread is also made with right-hand winding. If the thread in conical holes 4 and 5 is made with left-hand winding, then at the ends of reinforcement bars 1 and 2 the thread is also made with left-hand winding.

[0032] If the thread in one, for example, conical hole 4, is made with a right winding, and in conical hole 5 with a left winding, then the thread at the end of reinforcing bar 1 is made with a right winding, and the thread at the end of reinforcing bar 2 is made with a left winding.

[0033] Conical holes 4 and 5 in metal rod 3 can be made of the same or different sizes (hole diameter; outer, middle and inner thread diameters; thread pitch; thread winding direction; threaded hole depth) for the connected reinforcement rods 1 and 2 (see Fig. 6).

[0034] Between the conical holes 4 and 5 in the metal rod 3, a compensation belt 6 is made, the width of which exceeds the total maximum increase in the lengths of the mounted reinforcement rods 1 and 2 during their temperature increase.

[0035] An antifriction coating may be applied to the threads in the conical holes 4 and 5 of the metal rod 3 and, accordingly, to the threads of the connected reinforcement rods 1 and 2, and notches may be made on the tops of the threads in the conical holes 4 and 5 of the metal rod 3 and reinforcement rods 1 and 2 perpendicular to the thread turns.

[0036] Depending on the diameter of the connected reinforcement bars 1 and 2 with the required parameters, conical holes 4 and 5 are made in the metal bar 3, taking into account that with an increase in the diameter of the conical hole 4 or 5, the length of the conical hole 4 or 5 also increases.

[0037] The coupling for connecting reinforcement bars is used as follows.

[0038] First, on the ends of the reinforcement bars 1 and / or 2 to be connected, a thread is made that is identical in all parameters (outer, middle and inner diameters of the thread; thread pitch; direction of thread winding; length of the threaded end with a conical thread) to the thread made in the conical holes 4 and / or 5 of the metal bar 3.

[0039] Select the appropriate coupling for connecting the reinforcing bars with the appropriate diameter for reinforcing bars 1 and / or 2.

[0040] In embodiments where both reinforcement bars 1 and 2 are rotatable or reinforcement bar 1 is not rotatable and reinforcement bar 2 is rotatable, metal bar 3, for example, is screwed onto reinforcement bar 1 until the conical threaded portion of reinforcement bar 1 is completely screwed into the threaded portion of conical opening 4 with a tightening torque corresponding to the thread parameters. Further, reinforcement bar 2 is screwed with its threaded end into conical opening 5 of metal bar 3 until the conical threaded portion of reinforcement bar 2 is completely screwed into the threaded portion of conical opening 5 with a tightening torque corresponding to the thread parameters.

[0041] In the embodiment where both reinforcement bars 1 and 2 are unable to rotate, a conical thread with a right-hand winding is made on the conical end of, for example, reinforcement bar 1, and a conical thread with a left-hand winding is made on the conical end of reinforcement bar 2. A metal bar 3 is selected in which the thread, for example, in the conical opening 4, is made with a right-hand winding, and in the conical opening 5 with a left-hand winding. The metal bar 3 is installed coaxially between reinforcement bars 1 and 2 so that the beginning of the turns of the conical threads at the ends of reinforcement bars 1 and 2 comes into contact with the beginning of the turns of the conical threads of the conical openings 4 and 5, respectively.Next, by rotating the metal rod 3 in the appropriate direction, the reinforcement rods 1 and 2 are simultaneously screwed into the corresponding conical threaded holes 4 and 5 of the metal rod 3 until the conical threaded part of the reinforcement rod 1 is completely screwed into the threaded part of the conical hole 4, and the conical threaded part of the reinforcement rod 2 is completely screwed into the threaded part of the conical hole 5 with a tightening torque corresponding to the thread parameters.

[0042] The presence of a metal rod 3, at both ends of which conical holes 4 and 5 with a conical thread are made, wherein the thread in the conical holes 4 and 5 is identical to the thread on the conical ends of the reinforcing bars 1 and 2, allows for a detachable connection of the reinforcing bars 1 and 2 with the metal rod 3, including in embodiments where both reinforcing bars 1 and 2 have the ability to rotate or reinforcing bar 1 does not have the ability to rotate, and reinforcing bar 2 has the ability to rotate or both reinforcing bars 1 and 2 do not have the ability to rotate.

[0043] The production of conical holes 4 and 5 in the metal rod 3 of the same or different sizes (hole diameter; outer, average and inner thread diameters; thread pitch; thread winding direction; threaded hole depth) and, accordingly, the production of ends with a conical thread of reinforcing bars 1 and 2 with identical parameters for the corresponding conical hole 4 and 5, whereby with an increase in the diameter of the conical hole 4 or 5, the length of the conical holes 4 or 5 and the ends with a conical thread of reinforcing bars 1 and 2 also increases, which allows not only to expand the functional capabilities of the coupling, but also to ensure the reliability of the threaded connection of all types of rotating and non-rotating reinforcing bars 1 and 2.

[0044] The implementation of a compensation belt 6 between conical openings 4 and 5 in metal rod 3 makes it possible to exclude contact between the ends of reinforcement rods 1 and 2 when they are screwed into metal rod 3, thereby eliminating damage to the conical thread in conical openings 4, 5 and the conical thread at the ends of reinforcement rods 1, 2 and eliminating insufficient tightening torque corresponding to the thread parameters, thereby ensuring the reliability of the threaded connection of all types of rotating and non-rotating reinforcement rods 1 and 2.

[0045] The implementation of a compensation belt 6 between conical openings 4 and 5 in metal rod 3, the width of which exceeds the total maximum increment in the lengths of the mounted reinforcement rods 1 and 2, also makes it possible to eliminate contact between the ends of reinforcement rods 1 and 2 during their temperature increase, thereby ensuring the reliability of the threaded connection of all types of rotating and non-rotating reinforcement rods 1 and 2.

[0046] The application of an anti-friction coating, such as MODENGY 1014 coating, to the tapered threads in tapered holes 4 and 5 of the metal rod 3 and, accordingly, to the ends with tapered threads of the reinforcement rods 1 and 2 ensures the reliability of the threaded connection and prevents it from loosening, in particular, when the reinforcement rods are stretched or compressed in unstable seismic resistance.

[0047] Making notches on the thread tops in conical holes 4 and 5 of metal rod 3 perpendicular to the thread turns and, accordingly, on the ends with conical threads of reinforcement rods 1 and 2 improves the adhesion of the thread and increases the reliability of its connection. Thanks to the notches, the thread is better screwed and fixed, eliminating the risk of spontaneous unscrewing.

[0048] The production of metal rod 3 with a round, or square or hexagonal cross-section not only expands the functional capabilities of the coupling, but also reduces the labor intensity during installation of all types of rotating and non-rotating reinforcement rods 1 and 2 with metal rod 3.

[0049] The use of a coupling for connecting reinforcement bars ensures the reliability of the connection of reinforcement bars and guarantees further reliability of the connection during operation, in particular, when stretching or compressing the reinforcement frame with unstable seismic resistance.

Claims

FORMULA 1. A coupling for connecting reinforcing bars, including a metal bar, at both ends of which conical holes are made, in which a conical thread is made, characterized in that the metal bar is a fastener for a detachable connection with threaded conical ends of the reinforcing bars being mounted, wherein the thread in the conical holes of the metal bar is identical to the thread on the conical ends of the reinforcing bars, and between the conical holes in the metal bar a compensation belt is made, the width of which exceeds the total maximum increment in the lengths of the reinforcing bars being mounted during their temperature increase.

2. A coupling for connecting reinforcing bars, according to paragraph 1, characterized in that the thread in the conical holes of the metal bar is made with a right or left winding.

3. A coupling for connecting reinforcing bars, according to paragraph 1, characterized in that the thread in one conical hole of the metal bar is made with a right-hand winding, and in the other conical hole with a left-hand winding.

4. A coupling for connecting reinforcing bars, according to paragraph 1, characterized in that the conical holes in the metal bar are made of the same dimensions.

5. A coupling for connecting reinforcing bars, according to paragraph 1, characterized in that the conical holes in the metal bar are made of different sizes.

6. A coupling for connecting reinforcing bars, according to paragraph 1, characterized in that the metal bar is made of a round, or square, or hexagonal cross-section.

7. A coupling for connecting reinforcing bars, according to paragraph 1, characterized in that an antifriction coating is applied to the threads in the conical holes of the metal bar.

8. A coupling for connecting reinforcing bars, according to paragraph 1, characterized in that notches are made on the tops of the threads in the conical holes of the metal rod perpendicular to the thread turns.

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