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

A top-to-top steel bar connector with gap compensation function and connection method Technical Field

[0001] The invention relates to a top-to-top type steel bar connector with a gap compensation function and a connection method, belonging to the field of construction engineering. Background Art

[0002] In construction, it is often necessary to connect steel bars. For prefabricated concrete structures, such as the connection between precast concrete components and foundations, or the connection between precast beams and precast columns, the steel bars to be connected have been cast in the concrete components. The steel bars on both sides cannot be rotated or moved. In addition, the axes of the two steel bars in the same group cannot be guaranteed to be on the same axis. There is a deviation (i.e. radial deviation). Moreover, when connecting, generally multiple groups of steel bars need to be connected, and the spacing between the two steel bars in each group also has a deviation (i.e. axial deviation). This requires the steel bar connector to have radial and axial compensation capabilities to ensure the smooth connection of the steel bars and load transmission.

[0003] In the prior art, two steel bars are usually connected by grouting sleeves, double-layer threaded sleeves, or internal and external threaded sleeves, which have the following disadvantages: (1) When grouting sleeves are used for connection, the operation is cumbersome and the cost is high, and the connection strength depends on the chemical process, and the connection quality is difficult to control; (2) When mechanical connections are used, such as double-layer threaded sleeves or internal and external threaded sleeves, most of them also use a pipe structure with both internal and external threads, regardless of the connection method of double-layer threaded sleeves or internal and external threaded sleeves. The structure is complex, there are many parts, and the processing accuracy requirements of the parts are high, the cost is high, and the construction is difficult; one connection involves many threaded pair connections, and due to the double-layer nut structure, there may be up to 4 threaded pair connections.

[0004] In view of this, a mechanical connection device and a steel bar connection method for componentized construction of steel bars are disclosed in the patent document with application number CN201611207250.8. In the above-mentioned prior art, after the first steel bar and the second steel bar are connected, a gap is left between the ends of the two steel bars, which cannot be effectively tightened, affecting the connection quality; when there is a deviation between the axes of the first steel bar and the second steel bar, and the axes of the two steel bars cannot be guaranteed to be on the same axis (i.e., radial deviation), connection is difficult. Since internal threads and internal connecting threads 6 and 5 need to be set on the first internal thread sleeve 1 and the second internal thread sleeve 2, their structural setting volume is large and inconvenient to use.

[0005] In view of this, an adjustable steel bar threaded connection device is disclosed in the patent document with application number CN201120140646.1. The above-mentioned prior art cannot directly tighten the two steel bars, but can tighten the end face of the second steel bar to the first steel bar by setting a gasket, which affects the connection quality. At the same time, there is a lack of positioning structure for centering and guiding during connection, which makes it inconvenient to achieve the docking of the two steel bars.

[0006] In view of this, an adjustable steel bar connector is disclosed in the patent document with application number CN201921321724.0. In the above-mentioned prior art, the first steel bar is connected to the first connecting sleeve by a screw rod structure, and the second steel bar is connected to the second connecting sleeve by a screw rod structure. Although a double-layer threaded structure is not adopted, the thread needs to be lengthened, the processing cost is high and affects the connection quality. The processing cost is high and affects the connection quality. It also does not have radial compensation capability.

[0007] In view of this, patent document CN201480049649.0 discloses a sleeve-fastened steel bar connector using a joint end member. The above-mentioned prior art is used to connect the steel bars at both ends when they can be pulled, but cannot be connected when the two steel bars are fixed.

[0008] In view of this, the patent document with application number US15556684 discloses an adjustable compact lifting coupler and method of use. The above-mentioned prior art adopts the solution of inner and outer screw sleeves and has radial compensation capability, but the structure is complex, the volume is large, and it is inconvenient to operate. Summary of the Invention

[0009] The purpose of the present invention is to overcome the above-mentioned shortcomings in the prior art and to provide a top-to-top steel bar connector and connection method with a reasonable structural design, which can connect two steel bars by abutting the bolt head with the screw head and has a gap compensation function.

[0010] The technical solution adopted by the present invention to solve the above problem is: comprising a No. 1 connecting sleeve and a No. 2 connecting sleeve, and its structural characteristics are: further comprising a steel bar connector body for connecting the No. 1 connecting sleeve and the No. 2 connecting sleeve, the steel bar connector body comprising a bolt assembly and a screw assembly, the bolt assembly being connected to the screw assembly;

[0011] The bolt assembly includes a bolt, a connecting nut and a No. 1 locking nut. One end of the bolt is a bolt head, and the other end of the bolt is a bolt shank. The bolt head and the bolt shank are coaxially arranged. The No. 1 locking nut is sleeved on the bolt shank, and the No. 1 locking nut cooperates with the No. 1 connecting sleeve.

[0012] The screw assembly includes a screw, a screw adjusting nut and a No. 2 locking nut. One end of the screw is a screw head, and the other end of the screw is a screw rod. The screw head and the screw rod are coaxially arranged. The screw adjusting nut and the No. 2 locking nut are both sleeved on the screw rod, and the screw adjusting nut cooperates with the connecting screw sleeve, and the No. 2 locking nut cooperates with the No. 2 connecting sleeve.

[0013] The No. 1 connecting sleeve is connected to the bolt shank, the No. 2 connecting sleeve is connected to the screw shank, the connecting nut is fitted onto the bolt shank, and the bolt head and screw head engage via the connecting nut. This top-type rebar connector can mechanically connect the rebar between prefabricated beams / columns through the rebar connector body, making construction more convenient. The No. 1 locking nut can be used to lock the bolt shank to the No. 1 connecting sleeve; the screw adjustment nut can be used to adjust the length of the screw shank that can be screwed out of the No. 2 connecting sleeve and can also be used to lock the screw head to the connecting nut. The No. 2 locking nut can be used to lock the screw shank to the No. 2 connecting sleeve.

[0014] Furthermore, the bolt rod is threadedly connected to the No. 1 connecting sleeve, the screw rod is threadedly connected to the No. 2 connecting sleeve, the bolt head is located in the connecting screw sleeve, and the connecting screw sleeve is threadedly connected to the screw head.

[0015] Furthermore, a limit ring is provided on the connecting nut, and a limit platform is provided on the bolt head, and the limit platform cooperates with the limit ring. The limit platform is truncated cone-shaped, annular, or spherical, and is adapted to be mutually adapted with the limit ring. The shape of the limit platform includes but is not limited to the shapes listed above. The shape of the limit ring cooperates with the shape of the limit platform, so that the bolt shank can be pulled through the connecting nut so that the bolt head and the bolt shank are docked. When the bolt head is pulled through the connecting nut, the provided limit ring and limit platform can be used to withstand tensile load.

[0016] Furthermore, the bolt head is provided with a positioning protrusion, and the screw head is provided with a positioning groove, wherein the positioning groove cooperates with the positioning protrusion. The positioning protrusion is conical, cylindrical, or spherical and is adapted to fit 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 cooperates with the shape of the positioning protrusion to achieve centering and guidance of the bolt head and the screw head.

[0017] Furthermore, the middle portion of the limiting ring is a bolt through hole, and the bolt rod portion passes through the bolt through hole.

[0018] Furthermore, the diameter of the bolt through hole is larger than the diameter of the bolt shank. The radial deviation between the bolt head and the screw shank is compensated by the floating margin of the bolt head inside the connecting screw sleeve.

[0019] Furthermore, the screw shaft is provided with a nut section, a screw-out section, and a connecting section. In an initial state, an axial gap exists between the bolt head and the screw head, with the screw-out section exceeding the axial gap. The length of the screw-out section is increased by the length of the screw-out section. The length of the connecting section is determined by the length of the screw in the second connecting sleeve.

[0020] Furthermore, the No. 1 connecting sleeve is threaded or crimped to the No. 1 rebar, and the No. 2 connecting sleeve is threaded or crimped to the No. 2 rebar. If the rear portions of the No. 1 and No. 2 connecting sleeves are made into a blank hole, they can be connected to the No. 1 and No. 2 rebars by crimping. If they are made into internal threads, they can be used to connect to the rebar thread heads, thereby achieving the connection between the No. 1 and No. 2 connecting sleeves and the No. 1 and No. 2 rebars.

[0021] Furthermore, another technical purpose of the present invention is to provide a method for connecting steel bars using a top-to-top steel bar connector with a gap compensation function.

[0022] The above technical objectives of the present invention are achieved through the following technical solutions.

[0023] The first method for connecting steel bars of a top-to-top steel bar connector with a gap compensation function is to pre-connect the No. 1 connecting sleeve and the No. 2 connecting sleeve with the No. 1 steel bar and the No. 2 steel bar respectively before connection, and roughly align the No. 1 steel bar and the No. 2 steel bar. When the unscrewed section is greater than the axial gap, the No. 1 connecting sleeve and the No. 2 connecting sleeve can be connected through the main body of the steel bar connector. The method for connecting the No. 1 connecting sleeve and the No. 2 connecting sleeve using the main body of the steel bar connector is as follows:

[0024] (1) Turn the No. 1 locking nut to make the bolt shank in the No. 1 connecting sleeve in the unlocked state, and turn the screw adjusting nut to make the screw shank rotate out of the No. 2 connecting sleeve until the screw head and the bolt head are in contact with each other;

[0025] When the screw rod is aligned with the bolt, the axial force provided by the second connecting sleeve is used to align the positioning protrusion and the positioning groove. If the end face of the screw head and the end face of the bolt head cannot be completely aligned after alignment, the screw rod is further rotated out, and the axial force provided by the screw rod will force the end face of the screw head and the end face of the bolt head to be completely aligned.

[0026] (2) Move the connecting screw sleeve to the bolt head and make the connecting screw sleeve threadedly connected to the screw head;

[0027] (3) Tighten the connecting screw sleeve and the screw head, and lock the screw rod and the No. 2 connecting sleeve;

[0028] (4) Turn the No. 1 locking nut to the end face of the No. 1 connecting sleeve, and lock the bolt rod with the No. 1 connecting sleeve. Turn the screw adjusting nut to the end face of the connecting screw sleeve, and lock the connecting screw sleeve with the screw head. The connection is completed.

[0029] The second method of connecting steel bars of the top-to-top steel bar connector with a gap compensation function is to pre-connect the No. 1 connecting sleeve and the No. 2 connecting sleeve with the No. 1 steel bar and the No. 2 steel bar respectively before connection, and roughly align the No. 1 steel bar and the No. 2 steel bar. When the unscrewed section is greater than the axial gap, the No. 1 connecting sleeve and the No. 2 connecting sleeve can be connected through the main body of the steel bar connector. Its characteristics are: the method of connecting the No. 1 connecting sleeve and the No. 2 connecting sleeve using the main body of the steel bar connector is as follows:

[0030] (1) Turn the No. 1 locking nut to make the bolt shank in the No. 1 connecting sleeve in the unlocked state, and turn the screw adjusting nut to make the screw shank rotate out of the No. 2 connecting sleeve until the screw head and the bolt head are in contact with each other;

[0031] When the bolts are butted together, the diameter of the bolt through hole is set larger than the diameter of the bolt shank, and the radial deviation is compensated by the floating margin of the bolt head in the connecting screw sleeve. The axial force provided by unscrewing the screw shank will force the end face of the screw head to completely fit the end face of the bolt head.

[0032] (2) Move the connecting screw sleeve to the bolt head and make the connecting screw sleeve threadedly connected to the screw head;

[0033] (3) Tighten the connecting screw sleeve and the screw head, and lock the screw rod and the No. 2 connecting sleeve;

[0034] (4) Turn the No. 1 locking nut to the end face of the No. 1 connecting sleeve, and lock the bolt rod with the No. 1 connecting sleeve. Turn the screw adjusting nut to the end face of the connecting screw sleeve, and lock the connecting screw sleeve with the screw head. The connection is completed.

[0035] Compared with the existing technology, the present invention has the following advantages: 1. The No. 1 steel bar and the No. 2 steel bar are connected by the No. 1 connecting sleeve and the No. 2 connecting sleeve respectively. The bolt assembly is connected to the No. 1 connecting sleeve, and the screw assembly is connected to the No. 2 connecting sleeve. During assembly, the bolt assembly and the screw assembly are both in a non-locked state, and the bolt and the screw are exposed to a certain length of the No. 1 connecting sleeve and the No. 2 connecting sleeve respectively. The elasticity provided by the thread gap and the exposed length facilitates the threaded assembly of the connecting sleeve and the screw head.

[0036] 2. The bolt head and the screw head can be aligned by setting the positioning protrusions and positioning grooves, so that the end faces of the bolt head fit together. The bolt through hole can also be set with a diameter larger than the diameter of the bolt shank, so that the bolt head floats in the connecting screw sleeve. The radial deviation of the bolt head and the screw head can be compensated by the floating margin of the bolt head in the connecting screw sleeve, so that the end faces of the bolt head and the screw head fit together.

[0037] 3. No. 1 connecting sleeve and No. 2 connecting sleeve can be standard sleeves, and the steel bar connector can be used in conjunction with standard sleeves. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG1 is a schematic cross-sectional view of a steel bar connector according to embodiment 1 of the present invention.

[0039] FIG2 is a schematic diagram of the three-dimensional structure of the steel bar connector according to Example 1 of the present invention.

[0040] FIG3 is a schematic diagram 1 of the connection process of the steel bar connector according to Example 1 of the present invention.

[0041] FIG4 is a schematic diagram 2 of the connection process of the steel bar connector according to embodiment 1 of the present invention.

[0042] FIG5 is a schematic diagram 3 of the connection process of the steel bar connector according to embodiment 1 of the present invention.

[0043] FIG6 is a schematic diagram 4 of the connection process of the steel bar connector according to Example 1 of the present invention.

[0044] FIG7 is a schematic diagram 5 of the connection process of the steel bar connector according to Example 1 of the present invention.

[0045] FIG8 is a schematic cross-sectional view of the steel bar connector according to Example 2 of the present invention.

[0046] FIG9 is a schematic diagram of the three-dimensional structure of the steel bar connector according to Example 2 of the present invention.

[0047] FIG10 is a schematic diagram 1 of the connection process of the steel bar connector according to embodiment 2 of the present invention.

[0048] FIG11 is a schematic diagram 2 of the connection process of the steel bar connector according to embodiment 2 of the present invention.

[0049] FIG12 is a schematic diagram 3 of the connection process of the steel bar connector according to embodiment 2 of the present invention.

[0050] FIG13 is a schematic diagram 4 of the connection process of the steel bar connector according to embodiment 2 of the present invention.

[0051] FIG14 is a schematic diagram 5 of the connection process of the steel bar connector according to Example 2 of the present invention.

[0052] In the figure: bolt assembly 1, screw assembly 2, No. 1 connecting sleeve 3, No. 2 connecting sleeve 4, No. 1 steel bar 5, No. 2 steel bar 6,

[0053] Bolt 11, connecting screw sleeve 12, No. 1 locking nut 13, bolt head 14, bolt shank 15, positioning protrusion 16, limiting ring 17, limiting platform 18, bolt through hole 19,

[0054] Screw 21, screw adjustment nut 22, No. 2 locking nut 23, screw head 24, screw rod 25, positioning groove 26,

[0055] Nut section L1, unscrewing section L2, connecting section L3, axial gap G. DETAILED DESCRIPTION

[0056] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0057] Example 1 (as shown in Figure 1-7).

[0058] The top-to-top type steel bar connector with gap compensation function in this embodiment includes a No. 1 connecting sleeve 3 for connecting to the No. 1 steel bar 5 and a No. 2 connecting sleeve 4 for connecting to the No. 2 steel bar 6, and a steel bar connector body for connecting the No. 1 connecting sleeve 3 and the No. 2 connecting sleeve 4. The steel bar connector body includes a bolt assembly 1 and a screw assembly 2. The bolt assembly 1 is connected to the screw assembly 2. The No. 1 connecting sleeve 3 is threadedly connected or crimped to the No. 1 steel bar 5, and the No. 2 connecting sleeve 4 is threadedly connected or crimped to the No. 2 steel bar 6.

[0059] The bolt assembly 1 in this embodiment includes a bolt 11, a connecting nut 12 and a No. 1 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 arranged. The No. 1 locking nut 13 is sleeved on the bolt shank 15, and the No. 1 locking nut 13 is matched with the No. 1 connecting sleeve 3.

[0060] The screw assembly 2 in this embodiment includes a screw 21, a screw adjusting nut 22 and a No. 2 locking nut 23. One end of the screw 21 is a screw head 24, and the other end of the screw 21 is a screw rod 25. The screw head 24 and the screw rod 25 are coaxially arranged. The screw adjusting nut 22 and the No. 2 locking nut 23 are both mounted on the screw rod 25, and the screw adjusting nut 22 cooperates with the connecting screw sleeve 12, and the No. 2 locking nut 23 cooperates with the No. 2 connecting sleeve 4.

[0061] In this embodiment, the No. 1 connecting sleeve 3 is threadedly connected to the bolt rod 15, the No. 2 connecting sleeve 4 is threadedly connected to the screw rod 25, the connecting screw sleeve 12 is sleeved on the bolt rod 15, and the bolt head 14 and the screw head 24 are matched through the connecting screw sleeve 12, the bolt head 14 is located in the connecting screw sleeve 12, and the connecting screw sleeve 12 and the screw head 24 are threadedly connected.

[0062] In this embodiment, a positioning protrusion 16 is provided on the bolt head 14, and a positioning groove 26 is provided on the screw head 24, and the positioning groove 26 cooperates with the positioning protrusion 16; the positioning protrusion 16 is located in the positioning groove 26, and the positioning protrusion 16 can be conical, cylindrical or spherical, and is used to adapt to the positioning groove 26. When the screw adjusting nut 22 is rotated to unscrew the screw head 24, the positioning protrusion 16 and the positioning groove 26 can realize the centering function.

[0063] In this embodiment, a limiting ring 17 is provided on the connecting screw sleeve 12, and a limiting platform 18 is provided on the bolt head 14. The limiting platform 18 cooperates with the limiting ring 17. The middle part of the limiting ring 17 is a bolt through hole 19, and the bolt rod 15 passes through the bolt through hole 19; the limiting ring 17 contacts the limiting platform 18, and the limiting platform 18 can be frustum-shaped, annular or spherical, and is used to adapt to the limiting ring 17. After the connecting screw sleeve 12 is screwed into the screw head 24, the limiting platform 18 can be pressed by the limiting ring 17 to achieve a firm connection.

[0064] The screw rod portion 25 in this embodiment is provided with a nut section L1, an unscrewing section L2 and a connecting section L3. In the initial state, there is an axial gap G between the bolt head 14 and the screw head 24, and the unscrewing section L2 is greater than the axial gap G; the nut section L1 is used to install the screw adjustment nut 22 and the No. 2 locking nut 23 in the initial state, the unscrewing section L2 is used to make up the length of the axial gap G, and the connecting section L3 is used to connect the No. 2 connecting sleeve 4. The length of the connecting section L3 is determined by the length of the screw 21 in the No. 2 connecting sleeve 4, and the length of the axial gap G is determined by the steel bar connector body.

[0065] The “initial state” refers to the state after the bolt assembly 1 is connected to the No. 1 connecting sleeve 3 and the screw assembly 2 is connected to the No. 2 connecting sleeve 4, but before the main body of the steel bar connector is screwed, as shown in FIG3 .

[0066] The steel bar connection method of the top-to-top steel bar connector with gap compensation function in this embodiment is as follows: before connection, the No. 1 connecting sleeve 3 and the No. 2 connecting sleeve 4 are respectively connected to the No. 1 steel bar 5 and the No. 2 steel bar 6, and the No. 1 steel bar 5 and the No. 2 steel bar 6 are roughly aligned. When the unscrewed section L2 is greater than the axial gap G, the No. 1 connecting sleeve 3 and the No. 2 connecting sleeve 4 can be connected through the steel bar connector body.

[0067] The connection process of the rebar connector body is as follows:

[0068] (1) Turn the No. 1 locking nut 13 to make the bolt shank 15 in the No. 1 connecting sleeve 3 in an unlocked state (i.e., the bolt shank 15 is rotated in the No. 1 connecting sleeve 3 so that the length of the bolt shank 15 extending out of the No. 1 connecting sleeve 3 can be adjusted), and turn the screw adjusting nut 22 to make the screw shank 25 rotate out of the No. 2 connecting sleeve 4 (at this time, the screw shank 25 is in an unlocked state in the No. 2 connecting sleeve 4, and when the screw adjusting nut 22 is turned, the screw adjusting nut 22 contacts the screw head 24, as shown in FIG3 ), until the screw head 24 and the bolt head 14 are in contact with each other;

[0069] The screw 21 and the screw adjusting nut 22 may be an integrated structure (i.e., a structure similar to the screw adjusting nut 22 is directly machined on the screw 21, which can also facilitate unscrewing the screw 21), or a separate structure (i.e., embodiment 1 of the present application);

[0070] When they are in abutment with each other, the axial force provided by the No. 2 connecting sleeve 4 is unscrewed by the screw rod 25 to achieve the centering of the positioning protrusion 16 and the positioning groove 26. After centering, if the end face of the screw head 24 cannot be completely fitted with the end face of the bolt head 14, the screw rod 25 will continue to be unscrewed. The axial force provided by the screw rod 25 will force the end face of the screw head 24 to be completely fitted with the end face of the bolt head 14 (as shown in Figure 4).

[0071] (2) Move the connecting nut 12 to the bolt head 14 and make the connecting nut 12 threadedly connected to the screw head 24 (that is, screw the connecting nut 12 onto the screw head 24 with 2-3 threads, and then rotate the screw adjusting nut 22 and the second locking nut 23 in the opposite direction for a distance so that there is a distance between the screw head 24 and the screw adjusting nut 22, and between the screw adjusting nut 22 and the second locking nut 23, as shown in Figure 5).

[0072] (3) Tighten the connecting screw sleeve 12 and the screw head 24, and lock the screw rod 25 and the No. 2 connecting sleeve 4 (i.e., tighten the connecting screw sleeve 12 so that the limit ring 17 contacts the limit platform 18, and then rotate the No. 2 locking nut 23 so that the No. 2 locking nut 23 contacts the No. 2 connecting sleeve 4, so as to lock the screw rod 25 and the No. 2 connecting sleeve 4, as shown in Figure 6).

[0073] (4) Turn the No. 1 locking nut 13 to the end face of the No. 1 connecting sleeve 3, and lock the bolt shank 15 with the No. 1 connecting sleeve 3, turn the screw adjusting nut 22 to the end face of the connecting screw sleeve 12, and lock the connecting screw sleeve 12 with the screw head 24, and the connection is completed (as shown in Figure 7); if the screw 21 and the screw adjusting nut 22 are an integrated structure, when the screw head 24 and the bolt head 14 are against each other, the locking can be achieved by tightening the connecting screw sleeve 12 and the screw head 24.

[0074] This top-type steel bar connector is suitable for connecting small-diameter steel bars, such as steel bars with a diameter of less than 20 mm. The positioning protrusion 16 and the positioning groove 26 can be provided to achieve forced alignment of the bolt head 14 and the screw head 24, so that the end face of the bolt head 14 fits with the end face of the screw head 24.

[0075] Example 2 (as shown in Figures 8-14).

[0076] The top-to-top type steel bar connector with gap compensation function in this embodiment includes a No. 1 connecting sleeve 3 for connecting to the No. 1 steel bar 5 and a No. 2 connecting sleeve 4 for connecting to the No. 2 steel bar 6, and a steel bar connector body for connecting the No. 1 connecting sleeve 3 and the No. 2 connecting sleeve 4. The steel bar connector body includes a bolt assembly 1 and a screw assembly 2. The bolt assembly 1 is connected to the screw assembly 2. The No. 1 connecting sleeve 3 is threadedly connected or crimped to the No. 1 steel bar 5, and the No. 2 connecting sleeve 4 is threadedly connected or crimped to the No. 2 steel bar 6.

[0077] The bolt assembly 1 in this embodiment includes a bolt 11, a connecting nut 12 and a No. 1 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 arranged. The No. 1 locking nut 13 is sleeved on the bolt shank 15, and the No. 1 locking nut 13 is in contact with the No. 1 connecting sleeve 3.

[0078] The screw assembly 2 in this embodiment includes a screw 21, a screw adjusting nut 22 and a No. 2 locking nut 23. One end of the screw 21 is a screw head 24, and the other end of the screw 21 is a screw rod 25. The screw head 24 and the screw rod 25 are coaxially arranged. The screw adjusting nut 22 and the No. 2 locking nut 23 are both mounted on the screw rod 25, and the screw adjusting nut 22 is in contact with the connecting screw sleeve 12, and the No. 2 locking nut 23 is in contact with the No. 2 connecting sleeve 4.

[0079] In this embodiment, the No. 1 connecting sleeve 3 is threadedly connected to the bolt rod 15, the No. 2 connecting sleeve 4 is threadedly connected to the screw rod 25, the connecting screw sleeve 12 is sleeved on the bolt rod 15, and the bolt head 14 and the screw head 24 are matched through the connecting screw sleeve 12, the bolt head 14 is located in the connecting screw sleeve 12, and the connecting screw sleeve 12 and the screw head 24 are threadedly connected.

[0080] In this embodiment, a positioning protrusion 16 is provided on the bolt head 14, and a positioning groove 26 is provided on the screw head 24, and the positioning groove 26 cooperates with the positioning protrusion 16; the positioning protrusion 16 is located in the positioning groove 26, and the positioning protrusion 16 can be conical, cylindrical or spherical, and is used to adapt to the positioning groove 26. When the screw adjusting nut 22 is rotated to unscrew the screw head 24, the positioning protrusion 16 and the positioning groove 26 can realize the centering function.

[0081] In this embodiment, a limiting ring 17 is provided on the connecting screw sleeve 12, and a limiting platform 18 is provided on the bolt head 14. The limiting platform 18 cooperates with the limiting ring 17. The middle part of the limiting ring 17 is a bolt through hole 19, and the bolt shank 15 and the bolt through hole 19 pass through. 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 platform 18, and the limiting platform 18 can be frustum-shaped, annular or spherical, and is used to adapt to the limiting ring 17. After the connecting screw sleeve 12 is screwed into the screw head 24, the limiting platform 18 can be pressed by the limiting ring 17 to achieve a firm connection.

[0082] The screw rod portion 25 in this embodiment is provided with a nut section L1, an unscrewing section L2 and a connecting section L3. In the initial state, there is an axial gap G between the bolt head 14 and the screw head 24, and the unscrewing section L2 is greater than the axial gap G; the nut section L1 is used to install the screw adjustment nut 22 and the No. 2 locking nut 23 in the initial state, the unscrewing section L2 is used to make up the length of the axial gap G, and the connecting section L3 is used to connect the No. 2 connecting sleeve 4. The length of the connecting section L3 is determined by the length of the screw 21 in the No. 2 connecting sleeve 4, and the length of the axial gap G is determined by the steel bar connector body.

[0083] The “initial state” refers to the state after the bolt assembly 1 is connected to the No. 1 connecting sleeve 3 and the screw assembly 2 is connected to the No. 2 connecting sleeve 4, but before the main body of the steel bar connector is screwed, as shown in FIG10 .

[0084] The steel bar connection method of the top-to-top steel bar connector with gap compensation function in this embodiment is as follows: before connection, the No. 1 connecting sleeve 3 and the No. 2 connecting sleeve 4 are respectively connected to the No. 1 steel bar 5 and the No. 2 steel bar 6, and the No. 1 steel bar 5 and the No. 2 steel bar 6 are roughly aligned. When the unscrewed section L2 is greater than the axial gap G, the No. 1 connecting sleeve 3 and the No. 2 connecting sleeve 4 can be connected through the steel bar connector body.

[0085] The connection process of the rebar connector body is as follows:

[0086] (1) Turn the No. 1 locking nut 13 to make the bolt shank 15 in the No. 1 connecting sleeve 3 in an unlocked state (i.e., the bolt shank 15 is rotated in the No. 1 connecting sleeve 3 so that the length of the bolt shank 15 extending out of the No. 1 connecting sleeve 3 can be adjusted), and turn the screw adjusting nut 22 to make the screw shank 25 rotate out of the No. 2 connecting sleeve 4 (at this time, the screw shank 25 is in an unlocked state in the No. 2 connecting sleeve 4, and when the screw adjusting nut 22 is turned, the screw adjusting nut 22 contacts the screw head 24, as shown in FIG10 ), until the screw head 24 and the bolt head 14 are in contact with each other;

[0087] The screw 21 and the screw adjusting nut 22 may be an integrated structure (i.e., a structure similar to the screw adjusting nut 22 is directly machined on the screw 21, which can also facilitate unscrewing the screw 21), or a separate structure (i.e., embodiment 2 of the present application);

[0088] When the screws are butted together, the diameter of the bolt through hole 19 is set to be larger than the diameter of the bolt shank 15, and the radial deviation is compensated by relying on the floating margin of the bolt head 14 in the connecting screw sleeve 12. The axial force provided by unscrewing the screw shank 25 will force the end face of the screw head 24 to completely fit with the end face of the bolt head 14 (as shown in Figure 11).

[0089] (2) Move the connecting nut 12 to the bolt head 14 and make the connecting nut 12 threadedly connected to the screw head 24 (i.e. screw the connecting nut 12 onto the screw head 24 with 2-3 threads, then rotate the screw adjusting nut 22 and the second locking nut 23 in the opposite direction for a distance so that there is a distance between the screw head 24 and the screw adjusting nut 22, and between the screw adjusting nut 22 and the second locking nut 23, as shown in FIG12).

[0090] (3) Tighten the connecting screw sleeve 12 and the screw head 24, and lock the screw rod 25 and the No. 2 connecting sleeve 4 (i.e., tighten the connecting screw sleeve 12 so that the limit ring 17 contacts the limit platform 18, and then rotate the No. 2 locking nut 23 so that the No. 2 locking nut 23 contacts the No. 2 connecting sleeve 4, so as to lock the screw rod 25 and the No. 2 connecting sleeve 4, as shown in Figure 13).

[0091] (4) Turn the No. 1 locking nut 13 to the end face of the No. 1 connecting sleeve 3, and lock the bolt rod 15 with the No. 1 connecting sleeve 3, turn the screw adjusting nut 22 to the end face of the connecting screw sleeve 12, and lock the connecting screw sleeve 12 with the screw head 24, and the connection is completed (as shown in Figure 14); if the screw 21 and the screw adjusting nut 22 are an integrated structure, when the screw head 24 and the bolt head 14 are against each other, the locking can be achieved by tightening the connecting screw sleeve 12 and the screw head 24.

[0092] This top-type steel bar connector is suitable for connecting large-diameter steel bars. By setting the diameter of the bolt through hole 19 to be larger than the diameter of the bolt shank 15, the bolt head 14 can float in the connecting screw sleeve 12. The floating margin of the bolt head 14 in the connecting screw sleeve 12 can compensate for the radial deviation of the bolt head 14 and the screw head 24.

[0093] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is merely an example of the structure of the present invention.

Claims

1. A top-to-top steel bar connector with a gap compensation function, comprising a No. 1 connecting sleeve (3) and a No. 2 connecting sleeve (4), characterized in that: It also includes a steel bar connector body for connecting the No. 1 connecting sleeve (3) and the No. 2 connecting sleeve (4), the steel bar connector body comprising a bolt assembly (1) and a screw assembly (2), the bolt assembly (1) being connected to the screw assembly (2); The bolt assembly (1) comprises a bolt (11), a connecting nut (12) and a No. 1 locking nut (13); one end of the bolt (11) is a bolt head (14); the other end of the bolt (11) is a bolt shank (15); the bolt head (14) and the bolt shank (15) are coaxially arranged; the No. 1 locking nut (13) is sleeved on the bolt shank (15); and the No. 1 locking nut (13) cooperates with the No. 1 connecting sleeve (3). The screw assembly (2) comprises a screw (21), a screw adjustment nut (22) and a No. 2 locking nut (23); one end of the screw (21) is a screw head (24), the other end of the screw (21) is a screw rod (25), the screw head (24) and the screw rod (25) are coaxially arranged, the screw adjustment nut (22) and the No. 2 locking nut (23) are both sleeved on the screw rod (25), the screw adjustment nut (22) cooperates with the connecting screw sleeve (12), and the No. 2 locking nut (23) cooperates with the No. 2 connecting sleeve (4). The No. 1 connecting sleeve (3) is connected to the bolt shank (15), the No. 2 connecting sleeve (4) is connected to the screw rod shank (25), the connecting screw sleeve (12) is sleeved on the bolt shank (15), and the bolt head (14) and the screw rod head (24) are matched via the connecting screw sleeve (12).

2. The top-to-top steel bar connector with gap compensation function according to claim 1, characterized in that: The bolt shank (15) is threadedly connected to a No. 1 connecting sleeve (3), the screw rod shank (25) is threadedly connected to a No. 2 connecting sleeve (4), the bolt head (14) is located in the connecting screw sleeve (12), and the connecting screw sleeve (12) is threadedly connected to the screw head (24).

3. The top-to-top steel bar connector with gap compensation function according to claim 1, characterized in that: A limiting ring (17) is provided on the connecting screw sleeve (12), a limiting platform (18) is provided on the bolt head (14), and the limiting platform (18) cooperates with the limiting ring (17).

4. The top-to-top steel bar connector with gap compensation function according to claim 1, characterized in that: A positioning protrusion (16) is provided on the bolt head (14), and a positioning groove (26) is provided on the screw rod head (24), wherein the positioning groove (26) cooperates with the positioning protrusion (16).

5. The top-to-top steel bar connector with gap compensation function according to claim 3, characterized in that: The middle portion of the limiting ring (17) is a bolt through hole (19), and the bolt shank (15) penetrates the bolt through hole (19).

6. The top-to-top steel bar connector with gap compensation function according to claim 5, characterized in that: The hole diameter of the bolt through hole (19) is larger than the diameter of the bolt shank (15).

7. The top-to-top steel bar connector with gap compensation function according to claim 1, characterized in that: The screw rod portion (25) is provided with a nut section (L1), a screw-out section (L2) and a connection section (L3); in an initial state, an axial gap (G) exists between the bolt head (14) and the screw rod head (24), and the screw-out section (L2) is greater than the axial gap (G).

8. The top-to-top steel bar connector with gap compensation function according to claim 1, characterized in that: The No. 1 connecting sleeve (3) is threadedly connected or crimped to the No. 1 steel bar (5), and the No. 2 connecting sleeve (4) is threadedly connected or crimped to the No. 2 steel bar (6).

9. A method for connecting steel bars using a top-to-top steel bar connector with a gap compensation function according to any one of claims 1 to 8, characterized in that: The method of connecting the No. 1 connecting sleeve (3) and the No. 2 connecting sleeve (4) using the steel bar connector body is as follows: (1) Turn the No. 1 locking nut (13) to make the bolt shank (15) in the No. 1 connecting sleeve (3) in a non-locking state, and turn the screw adjusting nut (22) to make the screw shank (25) screw out of the No. 2 connecting sleeve (4) until the screw head (24) and the bolt head (14) are in abutment with each other; When the two ends are aligned, the axial force provided by the second connecting sleeve (4) is used to rotate the screw rod (25) to achieve the centering of the positioning protrusion (16) and the positioning groove (26). After the centering, if the end face of the screw head (24) and the end face of the bolt head (14) cannot be completely aligned, the screw rod (25) is further rotated out to force the end face of the screw head (24) to be completely aligned with the end face of the bolt head (14) through the axial force provided by the screw rod (25); (2) moving the connecting screw sleeve (12) to the bolt head (14) and threading the connecting screw sleeve (12) to the screw head (24); (3) Tighten the connecting screw sleeve (12) and the screw head (24), and lock the screw rod (25) and the No. 2 connecting sleeve (4); (4) Turn the No. 1 locking nut (13) to the end face of the No. 1 connecting sleeve (3), and lock the bolt shank (15) with the No. 1 connecting sleeve (3). Turn the screw adjustment nut (22) to the end face of the connecting screw sleeve (12), and lock the connecting screw sleeve (12) with the screw head (24), and the connection is completed.

10. A method for connecting steel bars using a top-to-top steel bar connector with a gap compensation function according to any one of claims 1 to 8, characterized in that: The method of connecting the No. 1 connecting sleeve (3) and the No. 2 connecting sleeve (4) using the steel bar connector body is as follows: (1) Turn the No. 1 locking nut (13) to make the bolt shank (15) in the No. 1 connecting sleeve (3) in a non-locking state, and turn the screw adjusting nut (22) to make the screw shank (25) screw out of the No. 2 connecting sleeve (4) until the screw head (24) and the bolt head (14) are in abutment with each other; When the bolts are butted against each other, the diameter of the bolt through hole (19) is set larger than the diameter of the bolt shank (15), and radial deviation is compensated by the floating margin of the bolt head (14) in the connecting screw sleeve (12). The axial force provided by the screw shank (25) is forced to completely fit the end face of the screw head (24) with the end face of the bolt head (14); (2) moving the connecting screw sleeve (12) to the bolt head (14) and threading the connecting screw sleeve (12) to the screw head (24); (3) Tighten the connecting screw sleeve (12) and the screw head (24), and lock the screw rod (25) and the No. 2 connecting sleeve (4); (4) Turn the No. 1 locking nut (13) to the end face of the No. 1 connecting sleeve (3), and lock the bolt shank (15) with the No. 1 connecting sleeve (3). Turn the screw adjustment nut (22) to the end face of the connecting screw sleeve (12), and lock the connecting screw sleeve (12) with the screw head (24), and the connection is completed.

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