Butt-coupling rebar coupler having gap compensation function, and coupling method

Abstract

The present invention relates to a butt-coupling rebar coupler having a gap compensation function and a coupling method, which belong to the field of construction engineering. The butt-coupling rebar coupler comprises a first coupling sleeve configured to be connected to a first rebar and a second coupling sleeve configured to be connected to a second rebar, and further comprises a rebar coupler body for coupling the first coupling sleeve and the second coupling sleeve, wherein the rebar coupler body comprises a bolt assembly and a screw assembly, the bolt assembly being connected to the screw assembly; the bolt assembly comprises a bolt and a coupling threaded insert, one end of the bolt being a bolt head, the other end of the bolt being a bolt shank, and the bolt head and the bolt shank being coaxially arranged; and the screw assembly comprises a screw, one end of the screw being a screw head, the other end of the screw shank being a screw shank, and the screw head and the screw shank being coaxially arranged.

Description

TECHNICAL FIELD

[0001] The present application relates to a butt-type rebar coupler with a clearance compensation function (i.e. the butt-coupling rebar coupler having gap compensation function) and a coupling method, belonging to the field of building engineering.BACKGROUND ART

[0002] In building construction, it is often necessary to couple the rebars. For connection between a prefabricated concrete structure such as a precast concrete component and a foundation, or connection between a precast beam and a precast column, to-be-coupled rebars have already been cast into the concrete components at this time, and the to-be-coupled rebars on the two sides cannot be rotated or moved; and in the same group of rebars, the axes of two rebars cannot be guaranteed to be on the same axis, resulting in deviation (i.e., radial deviation), and in addition, multiple groups of rebars usually need to be coupled during the coupling, and the spacing between the two rebars in each group of rebars also has deviation (i.e., axial deviation), so it is required that the rebar coupler has radial and axial compensation capabilities to ensure smooth coupling and load transfer of the rebars.

[0003] In the prior art, the coupling of two rebars is usually achieved by means of grouted sleeves, double-layer threaded sleeves, inner and outer threaded sleeves, or the like. It has the following disadvantages. (1) When using the grouted sleeves for coupling, the operation is complicated and the cost is high, and the coupling strength depends on the chemical process, and the coupling quality is difficult to control. (2) When using the double-layer threaded sleeves or the inner and outer threaded sleeves, etc. for mechanical coupling, whether it is the coupling mode of the double-layer threaded sleeves or the inner and outer threaded sleeves, most of them still use a pipe body structure with both internal and external threads, leading to a complex structure, numerous components, high requirements for component processing accuracy, high cost and great construction difficulty; and single coupling involves multiple thread pair joints, and up to four thread pair joints may be formed due to the double-layer nut structure.

[0004] In view of this, patent document with application number of CN201611207250.8 discloses a mechanical connection device for component-based construction of rebars and a rebar connection method. In the above-mentioned prior art, after the connection of the first rebar and the second rebar are completed, there is a clearance between the ends of the two rebars, which cannot be effectively butted tightly, affecting the connection quality; when there is a deviation between the axes of the first rebar and the second rebar, and the axes of the two rebars cannot be guaranteed to be on the same axis (i.e., radial deviation), the connection is difficult. Since the first inner thread sleeve 1 and the second inner thread sleeve 2 need to be provided with internal threads and internal connection thread 6 and internal connection thread 5, their structures provided are bulky and inconvenient to use.

[0005] In view of this, the patent document with application number of CN201120140646.1 discloses an adjustable rebar threaded connection device. The above-mentioned prior art cannot directly butt two rebars tightly, and may tightly butt the end faces of the second rebar and the first rebar through a gasket, which impairs the connection quality, and meanwhile, there is also a lack of a positioning structure for aligning and guiding during connection, making it inconvenient to realize the butting of the two rebars.

[0006] In view of this, the patent document with application number of CN201921321724.0 discloses an adjustable rebar coupler. In the above-mentioned prior art, the first rebar is coupled to the first coupling sleeve by using a screw rod structure, and the second rebar is coupled to the second coupling sleeve by using a screw rod structure. Although a double-layer threaded structure is not used, it requires lengthening the threaded segment, which increases processing costs and affects coupling quality. In addition, it does not have a radial compensation capability.

[0007] In view of this, the patent document with application number of CN201480049649.0 discloses a socket fastening-type reinforcing bar connector using binding end member. The above-mentioned prior art is used for connection when the rebars at two ends can be pulled, but cannot achieve the connection after the two rebars are fixed.

[0008] In view of this, the patent document with application number of US15556684 discloses "Adjustable compact lifting coupler and method of use". The above-mentioned prior art adopts the solution of inner and outer threaded sleeves and has a radial compensation capability, but has complex structure, and is oversized, and inconvenient to operate.SUMMARY

[0009] The purpose of the present application is to overcome the above-mentioned shortcomings in the prior art and to provide a butt-type rebar coupler with a clearance compensation function, and a coupling method, which feature a reasonable structural design and can realize the coupling of two rebars by the butting and fitting of a bolt head and a screw rod head.

[0010] The technical solution adopted by the present application to solve the above problems is that it includes a first coupling sleeve and a second coupling sleeve, and the structural feature thereof is that it further includes a rebar coupler body for coupling the first coupling sleeve and the second coupling sleeve, the rebar coupler body includes a bolt assembly and a screw rod assembly, and the bolt assembly is coupled with the screw rod assembly; the bolt assembly includes a bolt, a coupling threaded sleeve, and a first locking nut, where one end of the bolt is a bolt head, and the other end of the bolt is a bolt shank (i.e., the threaded portion of the bolt); the bolt head and the bolt shank are coaxially provided; and the first locking nut is sleeved over the bolt shank, and the first locking nut engages with the first coupling sleeve; the screw rod assembly includes a screw rod, a screw rod adjusting nut, and a second locking nut, where one end of the screw rod is a screw rod head, and the other end of the screw rod is a screw rod shank; the screw rod head and the screw rod shank are coaxially provided; and the screw rod adjusting nut and the second locking nut are both sleeved over the screw rod shank, the screw rod adjusting nut engages with the coupling threaded sleeve, and the second locking nut engages with the second coupling sleeve; and the first coupling sleeve is coupled with the bolt shank, and the second coupling sleeve is coupled with the screw rod shank, the coupling threaded sleeve is sleeved over the bolt shank, and the bolt head engages with the screw rod head by the coupling threaded sleeve. The butt-type rebar coupler may couple the rebars between precast beams / columns through the rebar coupler body by means of mechanical coupling, which is more convenient for construction; the first locking nut may be used to lock the bolt shank and the first coupling sleeve tightly; and the screw rod adjusting nut may be used to adjust the length of the screw rod shank screwed out from the second coupling sleeve, and may also be used to lock the screw rod head and the coupling threaded sleeve tightly, and the second locking nut may be used to lock the screw rod shank and the second coupling sleeve tightly.

[0011] Further, the bolt shank is threadedly coupled with the first coupling sleeve, the screw rod shank is threadedly coupled with the second coupling sleeve, the bolt head is located inside the coupling threaded sleeve, and the coupling threaded sleeve is threadedly coupled with the screw rod head.

[0012] Further, the coupling threaded sleeve is provided with a limiting ring, the bolt head is provided with a limiting shoulder, and the limiting shoulder engages with the limiting ring. The limiting shoulder is in a shape of frustum, ring, or sphere, and is used to be mutually adapted to the limiting ring; the shape of the limiting shoulder includes, but is not limited to, the shapes listed above, the shape of the limiting ring and the shape of the limiting shoulder match mutually, aiming to make the bolt head butted with the bolt shank by pulling the bolt shank through the coupling threaded sleeve; and when the bolt head is pulled by the coupling threaded sleeve, the provided limiting ring and limiting shoulder may be used to bear the tensile load.

[0013] Further, the bolt head is provided with a positioning protrusion, and the screw rod head is provided with a positioning groove, and the positioning groove engages with the positioning protrusion. The positioning protrusion is conical, cylindrical, or spherical, and used to be mutually adapted to the positioning groove. The shape of the positioning protrusion includes, but is not limited to, the shapes listed above. The shape of the positioning groove matches the shape of the positioning protrusion to achieve the aligning and guidance of the bolt head and the screw rod head.

[0014] Further, the middle part of the limiting ring is a bolt through hole, and the bolt shank passes through the bolt through hole.

[0015] Further, the aperture of the bolt through hole is larger than the diameter of the bolt shank. Compensation for the radial deviation between the bolt head and the screw rod head is achieved through the floating allowance of the bolt head within the coupling threaded sleeve.

[0016] Further, the screw rod shank is provided with a nut section, a screw-out section, and a coupling section. There is an axial clearance between the bolt head and the screw rod head in the initial state, and the length of the screw-out section > the axial clearance. The screw-out section is screwed out to use the screwed-out length of the screw-out section to compensate for the length of the axial clearance, and the length of the coupling section is determined by the length of the portion of the screw rod in the second coupling sleeve.

[0017] Further, the first coupling sleeve is threadedly coupled or crimped to the first rebar, and the second coupling sleeve is threadedly coupled or crimped to the second rebar. If the rear parts of the first coupling sleeve and second coupling sleeve are made to have smooth holes, they may be coupled with the first rebar and the second rebar by means of crimping, and if made to have internal threads, they may be used to be coupled with the threaded ends of the rebars, thus achieving the coupling between the first coupling sleeve and the first rebar and between the second coupling sleeve and the second rebar.

[0018] Further, the other technical purpose of the present application is to provide a rebar coupling method for the butt-type rebar coupler with a clearance compensation function.

[0019] The above-mentioned technical purpose of the present application is achieved through the following technical solutions.

[0020] The first rebar coupling method for a butt-type rebar coupler with a clearance compensation function involves pre-coupling the first coupling sleeve and the second coupling sleeve with the first rebar and the second rebar respectively before coupling, roughly aligning the first rebar and the second rebar, where when the length of the screw-out section > the axial clearance, the first coupling sleeve and second coupling sleeve may be coupled through the rebar coupler body, characterized in that the coupling method for the first coupling sleeve and the second coupling sleeve by using the rebar coupler body is as follows: (1) rotating the first locking nut so that the bolt shank in the first coupling sleeve is in an unlocked state; and rotating the screw rod adjusting nut so that the screw rod shank is screwed out of the second coupling sleeve until the screw rod head and the bolt head are butted; where during the butting, aligning of the positioning protrusion and the positioning groove is achieved by the axial force provided by screwing the screw rod shank out of the second coupling sleeve; and if the end face of the screw rod head and the end face of the bolt head cannot be fully butted after the aligning, the screw rod shank is continuously screwed out, such that the end face of the screw rod head and the end face of the bolt head are forced to be fully butted through the axial force provided by the screw rod shank; (2) moving the coupling threaded sleeve to the bolt head, and making the coupling threaded sleeve threadedly coupled to the screw rod head; (3) tightening the coupling threaded sleeve to the screw rod head, and locking the screw rod shank and the second coupling sleeve tightly; and (4) rotating the first locking nut to the end face of the first coupling sleeve, locking the bolt shank and the first coupling sleeve tightly, rotating the screw rod adjusting nut to the end face of the coupling threaded sleeve, and locking the coupling threaded sleeve and the screw rod head tightly, to complete the coupling.

[0021] The second rebar coupling method of a butt-type rebar coupler with a clearance compensation function involves pre-coupling the first coupling sleeve and the second coupling sleeve to the first rebar and the second rebar respectively before coupling, roughly aligning the first rebar and the second rebar, where when the length of the screw-out section > the axial clearance, the first coupling sleeve and second coupling sleeve may be coupled through the rebar coupler body, characterized in that the coupling method for the first coupling sleeve and the second coupling sleeve by using the rebar coupler body is as follows: (1) rotating the first locking nut so that the bolt shank in the first coupling sleeve is in an unlocked state; and rotating the screw rod adjusting nut, so that the screw rod shank is screwed out of the second coupling sleeve until the screw rod head and the bolt head are butted; where during the butting, by making the aperture of the bolt through hole larger than the diameter of the bolt shank, the compensation for radial deviation is achieved by relying on the floating allowance of the bolt head inside the coupling threaded sleeve; and the end face of the screw rod head and the end face of the bolt head are forced to be fully butted through axial force provided by screwing out the screw rod shank; (2) moving the coupling threaded sleeve to the bolt head, and making the coupling threaded sleeve threadedly coupled to the screw rod head; (3) tightening the coupling threaded sleeve to the screw rod head, and locking the screw rod shank and the second coupling sleeve tightly; and (4) rotating the first locking nut to the end face of the first coupling sleeve, locking the bolt shank and the first coupling sleeve tightly, rotating the screw rod adjusting nut to the end face of the coupling threaded sleeve, and locking the coupling threaded sleeve and the screw rod head tightly, to complete the coupling.

[0022] Compared with the prior art, the present application has the following advantages. 1.The first rebar and the second rebar are coupled by the first coupling sleeve and the second coupling sleeve respectively, the bolt assembly is coupled to the first coupling sleeve and the screw rod assembly is coupled to the second coupling sleeve; during assembly, the bolt assembly and the screw rod assembly are both in an unlocked state, and the bolt and the screw rod are exposed a certain length outside the first coupling sleeve and the second coupling sleeve respectively; and the elasticity provided by the thread clearance and the exposed length helps the threaded assembly of the coupling threaded sleeve and the screw rod head.

[0023] 2. The aligning of the bolt head and the screw rod head may be achieved by the provided positioning protrusion and positioning groove, so as to realize the butting of the end face of the bolt head against the end face of the screw rod head; also through the arrangement that the aperture of the bolt through hole is larger than the diameter of the bolt shank to allow the bolt head to float inside the coupling threaded sleeve, the compensation for radial deviation between the bolt head and the screw rod head may be achieved by the floating allowance of the bolt head inside the coupling threaded sleeve, so as to realize the butting of the end face of the bolt head against the end face of the screw rod head.

[0024] 3. The first coupling sleeve and the second coupling sleeve may be standard sleeves, and the rebar coupler may be used in conjunction with the standard sleeves.BRIEF DESCRIPTION OF DRAWINGS

[0025] FIG. 1 is a cross-sectional structural schematic view of the rebar coupler of Embodiment 1 of the present application. FIG. 2 is a three-dimensional structural schematic view of the rebar coupler of Embodiment 1 of the present application. FIG. 3 is the first schematic view of the coupling process of the rebar coupler of Embodiment 1 of the present application. FIG. 4 is the second schematic view of the coupling process of the rebar coupler of Embodiment 1 of the present application. FIG. 5 is the third schematic view of the coupling process of the rebar coupler of Embodiment 1 of the present application. FIG. 6 is the fourth schematic view of the coupling process of the rebar coupler of Embodiment 1 of the present application. FIG. 7 is the fifth schematic view of the coupling process of the rebar coupler of Embodiment 1 of the present application. FIG. 8 is a cross-sectional structural schematic view of the rebar coupler of Embodiment 2 of the present application. FIG. 9 is a three-dimensional structural schematic view of the rebar coupler of Embodiment 2 of the present application. FIG. 10 is the first schematic view of the coupling process of the rebar coupler in Embodiment 2 of the present application. FIG. 11 is the second schematic view of the coupling process of the rebar coupler in Embodiment 2 of the present application. FIG. 12 is the third schematic view of the coupling process of the rebar coupler in Embodiment 2 of the present application. FIG. 13 is the fourth schematic view of the coupling process of the rebar coupler in Embodiment 2 of the present application. FIG. 14 is the fifth schematic view of the coupling process of the rebar coupler in Embodiment 2 of the present application.

[0026] In the figures: bolt assembly 1, screw rod assembly 2, first coupling sleeve 3, second coupling sleeve 4, first rebar 5, second rebar 6, bolt 11, coupling threaded sleeve 12, first locking nut 13, bolt head 14, bolt shank 15, positioning protrusion 16, limiting ring 17, limiting shoulder 18, bolt through hole 9, screw rod 21, screw rod adjusting nut 22, second locking nut 23, screw rod head 24, screw rod shank 25, positioning groove 26, nut section L1, screw-out section L2, coupling section L3, axial clearance G. DETAILED DESCRIPTION OF EMBODIMENTS

[0027] The present application will be further described in detail below with reference to the drawings and through embodiments, and the following embodiments are intended to illustrate the present application rather than limit the present application thereto.Embodiment 1 (as shown in FIGS. 1-7).

[0028] In the present embodiment, the butt-type rebar coupler with a clearance compensation function includes a first coupling sleeve 3 for being coupled to the first rebar 5 and a second coupling sleeve 4 for being coupled to the second rebar 6, and a rebar coupler body for coupling the first coupling sleeve 3 and the second coupling sleeve 4, where the rebar coupler body includes a bolt assembly 1 and a screw rod assembly 2, the bolt assembly 1 is coupled to the screw rod assembly 2, the first coupling sleeve 3 is threadedly coupled or crimped to the first rebar 5, and the second coupling sleeve 4 is threadedly coupled or crimped to the second rebar 6.

[0029] In the present embodiment, the bolt assembly 1 includes a bolt 11, a coupling threaded sleeve 12, and a first locking nut 13, where one end of the bolt 11 is a bolt head 14, and the other end of the bolt 11 is a bolt shank 15, the bolt head 14 and the bolt shank 15 are provided coaxially, the first locking nut 13 is sleeved over the bolt shank 15, and the first locking nut 13 engages with the first coupling sleeve 3.

[0030] In the present embodiment, the screw rod assembly 2 includes a screw rod 21, a screw rod adjusting nut 22, and a second locking nut 23, where one end of the screw rod 21 is a screw rod head 24, and the other end of the screw rod 21 is a screw rod shank 25, the screw rod head 24 and the screw rod shank 25 are coaxially provided, the screw rod adjusting nut 22 and the second locking nut 23 are both sleeved over the screw rod shank 25, the screw rod adjusting nut 22 engages with the coupling threaded sleeve 12, and the second locking nut 23 engages with the second coupling sleeve 4.

[0031] In the present embodiment, the first coupling sleeve 3 is threadedly coupled to the bolt shank 15, the second coupling sleeve 4 is threadedly coupled to the screw rod shank 25, the coupling threaded sleeve 12 is sleeved over the bolt shank 15, the bolt head 14 engages with the screw rod head 24 through the coupling threaded sleeve 12, the bolt head 14 is located inside the coupling threaded sleeve 12, and the coupling threaded sleeve 12 is threadedly coupled to the screw rod head 24.

[0032] In the present embodiment, the bolt head 14 is provided with a positioning protrusion 16, and the screw rod head 24 is provided with a positioning groove 26, and the positioning groove 26 engages with the positioning protrusion 16; the positioning protrusion 16 is located in the positioning groove 26, the positioning protrusion 16 may be conical, cylindrical or spherical, and used to be mutually adapted to the positioning groove 26; and by rotating the screw rod adjusting nut 22 to screw out the screw rod head 24, the positioning protrusion 16 and the positioning groove 26 may achieve the centering and aligning function.

[0033] In the present embodiment, the coupling threaded sleeve 12 is provided with a limiting ring 17, the bolt head 14 is provided with a limiting shoulder 18, the limiting shoulder 18 engages with the limiting ring 17, the middle part of the limiting ring 17 is a bolt through hole 19, and the bolt shank 15 passes through the bolt through hole 19; the limiting ring 17 contacts the limiting shoulder 18, the limiting shoulder 18 may be frustum-shaped, ring-shaped, or spherical, and used to be mutually adapted to the limiting ring 17; and after the coupling threaded sleeve 12 is screwed into the screw rod head 24, a firm coupling may be achieved by pressing the limiting ring 17 tightly with the limiting shoulder 18.

[0034] In the present embodiment, the screw rod shank 25 is provided with a nut section L1, a screw-out section L2, and a coupling section L3, there is an axial clearance G between the bolt head 14 and the screw rod head 24 in the initial state, and the length of the screw-out section L2 > the axial clearance G; the nut section L1 is used to install the screw rod adjusting nut 22 and the second locking nut 23 in the initial state; the screw-out section L2 is used to compensate for the length of the axial clearance G, the coupling section L3 is used to couple the second coupling sleeve 4, the length of the coupling section L3 is determined by the length of the portion of the screw rod 21 in the second coupling sleeve 4, and the length of the axial clearance G is determined by the rebar coupler body.

[0035] The "initial state" refers to the state as shown in FIG. 3, in which the bolt assembly 1 is coupled with the first coupling sleeve 3, the screw rod assembly 2 is coupled with the second coupling sleeve 4, and the rebar coupler body has not yet been screwed.

[0036] In the present embodiment, the rebar coupling method for the butt-type rebar coupler with a clearance compensation function is as follows: before coupling, pre-coupling the first coupling sleeve 3 and the second coupling sleeve 4 to the first rebar 5 and the second rebar 6 respectively, roughly aligning the first rebar 5 and the second rebar 6; and when the length of the screw-out section L2 > the axial clearance G, coupling the first coupling sleeve 3 and the second coupling sleeve 4 through the rebar coupler body.

[0037] The coupling process of the rebar coupler body is as follows: (1) rotating the first locking nut 13 to make the bolt shank 15 in the first coupling sleeve 3 be in an unlocked state (i.e. to allow the bolt shank 15 to rotate inside the first coupling sleeve 3 so that the length of the bolt shank 15 extending out of the first coupling sleeve 3 may be adjusted), and rotating the screw rod adjusting nut 22 to make the screw rod shank 25 be screwed out of the second coupling sleeve 4 (at this time, the screw rod shank 25 is in an unlocked state in the second coupling sleeve 4, and the screw rod adjusting nut 22 contacts the screw rod head 24 when rotating the screw rod adjusting nut 22, as shown in FIG. 3), until the screw rod head 24 and the bolt head 14 are butted, where the screw rod 21 and the screw rod adjusting nut 22 may be provided to be of an integral structure (i.e., a structure similar to the screw rod adjusting nut 22 is directly machined on the screw rod 21, which also makes it easy to screw out the screw rod 21), or provided to be of a split structure (i.e., Embodiment 1 in the present application); and during the butting, the aligning of the positioning protrusion 16 and the positioning groove 26 is achieved through the axial force provided by screwing the screw rod shank 25 out from the second coupling sleeve 4; if the end face of the screw rod head 24 and the end face of the bolt head 14 cannot be fully butted after the aligning, the screw rod shank 25 is further screwed out, so that the end face of the screw rod head 24 and the end face of the bolt head 14 are forced to be fully butted through the axial force provided by the screw rod shank 25 (as shown in FIG. 4); (2) moving the coupling threaded sleeve 12 to the bolt head 14 and making the coupling threaded sleeve 12 threadedly coupled to the screw rod head 24 (i.e., screwing the coupling threaded sleeve 12 onto the screw rod head 24 by using 2-3 threads, and then rotating the screw rod adjusting nut 22 and the second locking nut 23 in the opposite direction by a distance so that there are distances between the screw rod head 24 and the screw rod adjusting nut 22, and between the screw rod adjusting nut 22 and the second locking nut 23, as shown in FIG. 5); (3) tightening the coupling threaded sleeve 12 to the screw rod head 24, and locking the screw rod shank 25 and the second coupling sleeve 4 tightly (i.e., tightening the coupling threaded sleeve 12 so that the limiting ring 17 contacts the limiting shoulder 18, and then rotating the second locking nut 23 so that the second locking nut 23 contacts the second coupling sleeve 4 to lock the screw rod shank 25 and the second coupling sleeve 4 tightly, as shown in FIG. 6); and (4) rotating the first locking nut 13 to the end face of the first coupling sleeve 3, and locking the bolt shank 15 and the first coupling sleeve 3 tightly, rotating the screw rod adjusting nut 22 to the end face of the coupling threaded sleeve 12, and locking the coupling threaded sleeve 12 and the screw rod head 24 tightly, to complete the coupling (as shown in FIG. 7), where if the screw rod 21 and the screw rod adjusting nut 22 are of an integral structure, when the screw rod head 24 butts against the bolt head 14, the tight locking may be achieved by tightening the coupling threaded sleeve 12 and the screw rod head 24.

[0038] The butt-type rebar coupler is suitable for small-diameter rebar coupling, such as the coupling of rebars with a diameter of 20 mm or below. Forced aligning of the bolt head 14 and the screw rod head 24 may be achieved by the provided positioning protrusion 16 and positioning groove 26, such that the end face of the bolt head 14 butts against the end face of the screw rod head 24.Embodiment 2 (as shown in FIGS. 8-14)

[0039] In the present embodiment, the butt-type rebar coupler with a clearance compensation function includes a first coupling sleeve 3 for being coupled to the first rebar 5 and a second coupling sleeve 4 for being coupled to the second rebar 6, and a rebar coupler body for coupling the first coupling sleeve 3 and the second coupling sleeve 4, where the rebar coupler body includes a bolt assembly 1 and a screw rod assembly 2, the bolt assembly 1 is coupled to the screw rod assembly 2, the first coupling sleeve 3 is threadedly coupled or crimped to the first rebar 5, and the second coupling sleeve 4 is threadedly coupled or crimped to the second rebar 6.

[0040] In the present embodiment, the bolt assembly 1 includes a bolt 11, a coupling threaded sleeve 12, and a first locking nut 13, where one end of the bolt 11 is a bolt head 14, and the other end of the bolt 11 is a bolt shank 15, the bolt head 14 and the bolt shank 15 are coaxially provided, the first locking nut 13 is sleeved over the bolt shank 15, and the first locking nut 13 is in contact with the first coupling sleeve 3.

[0041] In the present embodiment, the screw rod assembly 2 includes a screw rod 21, a screw rod adjusting nut 22, and a second locking nut 23, where one end of the screw rod 21 is a screw rod head 24, and the other end of the screw rod 21 is a screw rod shank 25, the screw rod head 24 and the screw rod shank 25 are coaxially provided, the screw rod adjusting nut 22 and the second locking nut 23 are both sleeved over the screw rod shank 25, the screw rod adjusting nut 22 is in contact with the coupling threaded sleeve 12, and the second locking nut 23 is in contact with the second coupling sleeve 4.

[0042] In the present embodiment, the first coupling sleeve 3 is threadedly coupled to the bolt shank 15, the second coupling sleeve 4 is threadedly coupled to the screw rod shank 25, the coupling threaded sleeve 12 is sleeved over the bolt shank 15, the bolt head 14 engages with the screw rod head 24 by the coupling threaded sleeve 12, the bolt head 14 is located inside the coupling threaded sleeve 12, and the coupling threaded sleeve 12 is threadedly coupled to the screw rod head 24.

[0043] In the present embodiment, the bolt head 14 is provided with a positioning protrusion 16, and the screw rod head 24 is provided with a positioning groove 26, and the positioning groove 26 engages with the positioning protrusion 16; the positioning protrusion 16 is located in the positioning groove 26, the positioning protrusion 16 may be conical, cylindrical or spherical, and used to be mutually adapted to the positioning groove 26; and by rotating the screw rod adjusting nut 22 to screw out the screw rod head 24, the positioning protrusion 16 and the positioning groove 26 may achieve the centering and aligning function.

[0044] In the present embodiment, the coupling threaded sleeve 12 is provided with a limiting ring 17, the bolt head 14 is provided with a limiting shoulder 18, the limiting shoulder 18 engages with the limiting ring 17, the middle part of the limiting ring 17 is a bolt through hole 19, and the bolt shank 15 passes through the bolt through hole 19, and the aperture of the bolt through hole 19 is larger than the diameter of the bolt shank 15; the limiting ring 17 contacts the limiting shoulder 18, the limiting shoulder 18 may be frustum-shaped, ring-shaped, or spherical, and used to be mutually adapted to the limiting ring 17; and after the coupling threaded sleeve 12 is screwed into the screw rod head 24, the limiting ring 17 may tightly press the limiting shoulder 18 to achieve firm coupling.

[0045] In the present embodiment, the screw rod shank 25 is provided with a nut section L1, a screw-out section L2, and a coupling section L3, where in the initial state, there is an axial clearance G between the bolt head 14 and the screw rod head 24, and the length of the screw-out section L2 > the axial clearance G; and the nut section L1 is used to install the screw rod adjusting nut 22 and the second locking nut 23 in the initial state, the screw-out section L2 is used to compensate for the length of the axial clearance G, the coupling section L3 is used to be coupled to the second coupling sleeve 4, the length of the coupling section L3 is determined by the length of the portion of the screw rod 21 in the second coupling sleeve 4, and the length of the axial clearance G is determined by the rebar coupler body.

[0046] The "initial state" refers to the state as shown in FIG. 10, in which the bolt assembly 1 is coupled to the first coupling sleeve 3 and the screw rod assembly 2 is coupled to the second coupling sleeve 4, and the rebar coupler body has not yet been screwed.

[0047] In the present embodiment, the rebar coupling method for the butt-type rebar coupler with a clearance compensation function is as follows: before coupling, pre- coupling the first coupling sleeve 3 and the second coupling sleeve 4 to the first rebar 5 and the second rebar 6 respectively, roughly aligning the first rebar 5 and the second rebar 6; and when the length of the screw-out section L2 > axial clearance G, coupling the first coupling sleeve 3 and the second coupling sleeve 4 through the rebar coupler body.

[0048] The coupling process of the rebar coupler body is as follows: (1) rotating the first locking nut 13 to make the bolt shank 15 in the first coupling sleeve 3 be in an unlocked state (i.e. to allow the bolt shank 15 to rotate inside the first coupling sleeve 3 so that the length of the bolt shank 15 extending out of the first coupling sleeve 3 may be adjusted), and rotating the screw rod adjusting nut 22 to make the screw rod shank 25 be screwed out of the second coupling sleeve 4 (at this time, the screw rod shank 25 is in an unlocked state in the second coupling sleeve 4, and the screw rod adjusting nut 22 contacts the screw rod head 24 when rotating the screw rod adjusting nut 22, as shown in FIG. 10), until the screw rod head 24 butts against the bolt head 14, where the screw rod 21 and the screw rod adjusting nut 22 may be provided to be of an integral structure (i.e., a structure similar to the screw rod adjusting nut 22 is directly machined on the screw rod 21, which also makes it easy to screw out the screw rod 21), or provided to be of a split structure (i.e., Embodiment 2 in the present application); and during the butting, through the arrangement that the aperture of the bolt through hole 19 is larger than the diameter of the bolt shank 15, the compensation for radial deviation is achieved by relying on the floating allowance of the bolt head 14 inside the coupling threaded sleeve 12; and the end face of the screw rod head 24 and the end face of the bolt head 14 are forced to be fully butted through the axial force provided by screwing out the screw rod shank 25 (as shown in FIG. 11); (2) moving the coupling threaded sleeve 12 to the bolt head 14 and making the coupling threaded sleeve 12 threadedly coupled to the screw rod head 24 (i.e., screwing the coupling threaded sleeve 12 onto the screw rod head 24 by using 2-3 threads, and then rotating the screw rod adjusting nut 22 and the second locking nut 23 in the opposite direction by a distance so that there are distances between the screw rod head 24 and the screw rod adjusting nut 22, and between the screw rod adjusting nut 22 and the second locking nut 23, as shown in FIG. 12); (3) tightening the coupling threaded sleeve 12 to the screw rod head 24, and locking the screw rod shank 25 and the second coupling sleeve 4 tightly (i.e., tightening the coupling threaded sleeve 12 so that the limiting ring 17 contacts the limiting shoulder 18, and then rotating the second locking nut 23 so that the second locking nut 23 contacts the second coupling sleeve 4 to lock the screw rod shank 25 and the second coupling sleeve 4 tightly, as shown in FIG. 13); and (4) rotating the first locking nut 13 to the end face of the first coupling sleeve 3, and locking the bolt shank 15 and the first coupling sleeve 3 tightly, rotating the screw rod adjusting nut 22 to the end face of the coupling threaded sleeve 12, and locking the coupling threaded sleeve 12 and the screw rod head 24 tightly, to complete the coupling (as shown in FIG. 14), where if the screw rod 21 and the screw rod adjusting nut 22 are of an integral structure, when the screw rod head 24 butts against the bolt head 14, the tight locking may be achieved by tightening the coupling threaded sleeve 12 and the screw rod head 24.

[0049] The butt-type rebar coupler is suitable for large-diameter rebar coupling; and the bolt head 14 may float inside the coupling threaded sleeve 12 through the arrangement that the aperture of the bolt through hole 19 is larger than the diameter of the bolt shank 15, and the compensation for radial deviation between the bolt head 14 and the screw rod head 24 is achieved by the floating allowance of the bolt head 14 inside the coupling threaded sleeve 12.

[0050] Furthermore, it should be noted that the specific embodiments described in the specification may have different shapes and names of their parts and components. The above description in the specification is merely an illustrative example of the structure of the present application.

Claims

1. A butt-type rebar coupler with a clearance compensation function, comprising a first coupling sleeve (3) and a second coupling sleeve (4), characterized by further comprising a rebar coupler body configured for connecting the first coupling sleeve (3) and the second coupling sleeve (4), wherein the rebar coupler body comprises a bolt assembly (1) and a screw rod assembly (2), and the bolt assembly (1) is coupled with the screw rod assembly (2); the bolt assembly (1) comprises a bolt (11), a coupling threaded sleeve (12), and a first locking nut (13), one end of the bolt (11) is a bolt head (14), and the other end of the bolt (11) is a bolt shank (15), the bolt head (14) and the bolt shank (15) are coaxially provided, the first locking nut (13) is sleeved over the bolt shank (15), and the first locking nut (13) engages with the first coupling sleeve (3); the screw rod assembly (2) comprises a screw rod (21), a screw rod adjusting nut (22), and a second locking nut (23), one end of the screw rod (21) is a screw rod head (24), and the other end of the screw rod (21) is a screw rod shank (25), the screw rod head (24) and the screw rod shank (25) are coaxially provided, the screw rod adjusting nut (22) and the second locking nut (23) are both sleeved over the screw rod shank (25), the screw rod adjusting nut (22) engages with the coupling threaded sleeve (12), and the second locking nut (23) engages with the second coupling sleeve (4); and the first coupling sleeve (3) is coupled to the bolt shank (15), the second coupling sleeve (4) is coupled with the screw rod shank (25), the coupling threaded sleeve (12) is sleeved over the bolt shank (15), and the bolt head (14) engages with the screw rod head (24) by the coupling threaded sleeve (12).

2. The butt-type rebar coupler with a clearance compensation function according to claim 1, wherein the bolt shank (15) is threadedly coupled with the first coupling sleeve (3), the screw rod shank (25) is threadedly coupled with the second coupling sleeve (4), the bolt head (14) is located inside the coupling threaded sleeve (12), and the coupling threaded sleeve (12) is threadedly coupled with the screw rod head (24).

3. The butt-type rebar coupler with a clearance compensation function according to claim 1, wherein the coupling threaded sleeve (12) is provided with a limiting ring (17), the bolt head (14) is provided with a limiting shoulder (18), and the limiting shoulder (18) engages with the limiting ring (17).

4. The butt-type rebar coupler with a clearance compensation function according to claim 1, wherein the bolt head (14) is provided with a positioning protrusion (16), and the screw rod head (24) is provided with a positioning groove (26), and the positioning groove (26) engages with the positioning protrusion (16).

5. The butt-type rebar coupler with a clearance compensation function according to claim 3, wherein a middle part of the limiting ring (17) is a bolt through hole (19), and the bolt shank (15) passes through the bolt through hole (19).

6. The butt-type rebar coupler with a clearance compensation function according to claim 5, wherein an aperture of the bolt through hole (19) is larger than a diameter of the bolt shank (15).

7. The butt-type rebar coupler with a clearance compensation function according to claim 1, wherein the screw rod shank (25) is provided with a nut section (L1), a screw-out section (L2) and a coupling section (L3); and in an initial state, there is an axial clearance (G) between the bolt head (14) and the screw rod head (24), and a length of the screw-out section (L2) > the axial clearance (G).

8. The butt-type rebar coupler with a clearance compensation function according to claim 1, wherein the first coupling sleeve (3) is threadedly coupled or crimped to the first rebar (5), and the second coupling sleeve (4) is threadedly coupled or crimped to the second rebar (6).

9. A rebar coupling method for the butt-type rebar coupler with a clearance compensation function according to any one of claims 1-8, wherein a method for coupling the first coupling sleeve (3) and the second coupling sleeve (4) by using the rebar coupler body is as follows: (1) rotating the first locking nut (13) so that the bolt shank (15) in the first coupling sleeve (3) is in an unlocked state, rotating the screw rod adjusting nut (22) so that the screw rod shank (25) is screwed out of the second coupling sleeve (4) until the screw rod head (24) and the bolt head (14) are butted; wherein during the butting, aligning of the positioning protrusion (16) and the positioning groove (26) is achieved by an axial force provided by screwing the screw rod shank (25) out of the second coupling sleeve (4), and if an end face of the screw rod head (24) and an end face of the bolt head (14) cannot be fully butted after the aligning, the screw rod shank (25) is continuously screwed out, such that the end face of the screw rod head (24) and the end face of the bolt head (14) are forced to be fully butted through the axial force provided by the screw rod shank; (2) moving the coupling threaded sleeve (12) to the bolt head (14), and making the coupling threaded sleeve (12) threadedly coupled to the screw rod head (24); (3) tightening the coupling threaded sleeve (12) to the screw rod head (24), and locking the screw rod shank (25) and the second coupling sleeve (4) tightly; and (4) rotating the first locking nut (13) to an end face of the first coupling sleeve (3), and locking the bolt shank (15) and the first coupling sleeve (3) tightly, rotating the screw rod adjusting nut (22) to an end face of the coupling threaded sleeve (12), and locking the coupling threaded sleeve (12) and the screw rod head (24) tightly, to complete the coupling.

10. A rebar coupling method for the butt-type rebar coupler with a clearance compensation function according to any one of claims 1-8, wherein a method for coupling the first coupling sleeve (3) and the second coupling sleeve (4) by using the rebar coupler body is as follows: (1) rotating the first locking nut (13) so that the bolt shank (15) in the first coupling sleeve (3) is in an unlocked state; and rotating the screw rod adjusting nut (22) so that the screw rod shank (25) is screwed out of the second coupling sleeve (4) until the screw rod head (24) and the bolt head (14) are butted, wherein during the butting, through an arrangement that an aperture of the bolt through hole (19) is larger than a diameter of the bolt shank (15), compensation for radial deviation is achieved by relying on a floating allowance of the bolt head (14) inside the coupling threaded sleeve (12); and an end face of the screw rod head (24) and an end face of the bolt head (14) are forced to be fully butted through an axial force provided by screwing out the screw rod shank; (2) moving the coupling threaded sleeve (12) to the bolt head (14), and making the coupling threaded sleeve (12) threadedly coupled to the screw rod head (24); (3) tightening the coupling threaded sleeve (12) to the screw rod head (24), and locking the screw rod shank (25) and the second coupling sleeve (4) tightly; and (4) rotating the first locking nut (13) to an end face of the first coupling sleeve (3), and locking the bolt shank (15) and the first coupling sleeve (3) tightly, rotating the screw rod adjusting nut (22) to an end face of the coupling threaded sleeve (12), and locking the coupling threaded sleeve (12) and the screw rod head (24) tightly, to complete the coupling.

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