Steel bar mechanical connector for prefabricated part

Abstract

The invention discloses a reinforcing steel bar mechanical connector for a prefabricated part, and relates to the field of concrete prefabricated parts, the reinforcing steel bar mechanical connector comprises a ball head connecting screw rod, and two groups of reinforcing steel bar off-axis connecting pieces are symmetrically mounted at the two ends of the ball head connecting screw rod; the semispherical head of the first rotating head can rotate in the first semispherical groove of the supporting sleeve, the semispherical head of the second rotating head can rotate in the second semispherical groove of the compression-resistant gasket, and the two spherical pairs act together to allow the ball head connecting lead screw and the steel bar off-axis sleeve to deflect relatively. Therefore, the relative axis and angle deviation of the steel bars needing to be connected of the component connector are compensated in a self-adaptive mode, barbaric construction behaviors such as forced beating and steel bar prying bending are avoided, construction efficiency is improved, the integrity of steel bar base metal and threads is protected, certain design torque is applied to the corresponding threads, effective pre-tightening force of steel bar connection can be formed, and the service life of the steel bar connector is prolonged. And the connection quality of the component joint steel bars is ensured, so that the component joint forms the seismic fortification requirements of strong joints and weak components.

Description

Technical Field

[0001] This invention relates to precast concrete technology, and more specifically to a mechanical connector for reinforcing bars used in precast components. Background Technology

[0002] With the rapid development of building industrialization, the application of precast concrete structures (PC structures) is becoming increasingly widespread. In PC structures, reliable connection of steel bars between precast components is the key to ensuring the integrity and safety of the structure. At present, the mainstream steel bar connection methods mainly include grouting sleeve connection and conventional straight thread and tapered thread mechanical connection.

[0003] Existing grouting sleeve connections suffer from problems such as invisible quality, difficulty in inspection, high risk of incomplete grouting, complex construction processes, high requirements for the working environment, and long construction periods. Furthermore, conventional mechanical connectors (such as straight thread sleeves and tapered thread sleeves) cannot compensate for deviations in the axis and angle of the reinforcing bars. During the production of precast components, factors such as mold precision, reinforcing bar binding deviations, and disturbances during concrete pouring inevitably lead to axial position deviations (±ΔX, ±ΔY) and angular deflections (±Δθ) in the connecting reinforcing bars extending from the components. Conventional rigid mechanical connectors require strict alignment of the connected reinforcing bars. When deviations exist, installation becomes extremely difficult or even impossible. Workers often resort to rough construction methods such as forcibly hammering and prying the reinforcing bars, which not only damages the threads but also damages the reinforcing bar material, resulting in low construction efficiency and safety hazards. Summary of the Invention

[0004] The purpose of this invention is to provide a mechanical connector for steel bars used in precast components, in order to solve the problem that in the prior art, when there is a deviation in the connected steel bars, workers often use rough construction methods such as forcibly hammering and prying the steel bars, which not only damages the threads, but also damages the steel bar base material, creating structural safety hazards.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mechanical connector for steel bars in prefabricated components, comprising a ball-head connecting screw, wherein a set of steel bar off-axis connectors are symmetrically installed at both ends of the ball-head connecting screw;

[0006] The rebar off-axis connector includes a rebar off-axis sleeve. A support sleeve is installed at one end of the rebar off-axis sleeve near the middle of the ball-head connecting screw. A first rotating head is installed on the ball-head connecting screw, which is located in the inner cavity of the rebar off-axis sleeve. A second rotating head, which is symmetrically arranged and has the same structure as the first rotating head, is also installed on the ball-head connecting screw. A pressure-resistant gasket is sleeved in the middle of the ball-head connecting screw, and the pressure-resistant gasket is located between the support sleeve and the second rotating head.

[0007] Furthermore, the steel bar off-axis sleeve has a first threaded groove in the inner cavity of the end where the support sleeve is located, and a first nut head is fixedly installed at the other end of the steel bar off-axis sleeve, with a second threaded groove in the middle of the first nut head.

[0008] Furthermore, both the first rotating head and the second rotating head include a hemispherical head, one end of which is fixedly fitted with a second nut head, and the second nut head and the hemispherical head are provided with a third threaded groove in the middle for matching the ball head connecting screw thread installation.

[0009] Furthermore, the pressure-resistant pad has a second hemispherical groove at one end near the second rotating head, which matches the upper hemispherical head of the pad.

[0010] Furthermore, the outer wall of the support sleeve is provided with an external thread that matches the first threaded groove, a third nut head is installed at one end of the support sleeve near the pressure-resistant gasket, and a first hemispherical groove that matches the hemispherical head of the first rotating head is provided at the middle of the other end of the support sleeve.

[0011] Compared with existing technologies, the present invention provides a mechanical connector for steel bars in precast components. The hemispherical head of the first rotating head can rotate within the first hemispherical groove of the support sleeve, while the hemispherical head of the second rotating head can rotate within the second hemispherical groove of the compression washer. These two spherical pairs work together to allow relative deflection between the ball-head connecting threaded rod and the steel bar off-axis sleeve, thereby adaptively compensating for relative axial and angular deviations of the steel bar. This completely avoids harsh construction practices such as forced hammering and prying of the steel bar, protecting the integrity of the steel bar base material and threads. All connections are mechanical threaded connections, making connection quality visible and inspectable, eliminating the risks of incomplete grouting and hidden quality issues. Furthermore, the design of the first, second, and third nut heads allows each critical connection point to be operated using a conventional wrench, significantly simplifying the installation process, reducing requirements on workers and the environment, and significantly shortening the construction period. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0013] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0014] Figure 2 This is an overall structural cross-sectional view provided for an embodiment of the present invention;

[0015] Figure 3An exploded view of the overall structure provided in an embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the off-axis rebar connector provided in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Ball joint connecting screw;

[0019] 2. Off-axis connector for reinforcing bars;

[0020] 21. Off-axis sleeve for reinforcing bars; 211. First threaded groove; 212. First nut head; 213. Second threaded groove;

[0021] 22. First rotating head; 221. Third threaded groove; 222. Second nut head; 223. Hemispherical head;

[0022] 23. Support sleeve; 231. First hemispherical groove; 232. External thread; 233. Third nut head;

[0023] 24. Compression gaskets;

[0024] 25. Second rotating head. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] As attached Figure 1 To be continued Figure 4 As shown:

[0027] Example 1:

[0028] This invention provides a mechanical connector for steel bars in precast components. The connector includes a ball-head connecting screw 1, with two sets of steel bar off-axis connectors 2 symmetrically installed at both ends.

[0029] The rebar off-axis connector 2 includes a rebar off-axis sleeve 21. A support sleeve 23 is installed at one end of the sleeve near the middle of the ball-end connecting screw 1. A first rotating head 22 is installed on the ball-end connecting screw 1. The first rotating head 22 is located in the inner cavity of the rebar off-axis sleeve 21. At the same time, a second rotating head 25, which is symmetrically arranged and has the same structure as the first rotating head 22, is also installed on the ball-end connecting screw 1. A pressure-resistant pad 24 is sleeved in the middle of the ball-end connecting screw 1. The pressure-resistant pad 24 is located between the support sleeve 23 and the second rotating head 25.

[0030] The steel bar off-axis sleeve 21 has a first threaded groove 211 at one end of its inner cavity [i.e., the end where the support sleeve 23 is installed], and a first nut head 212 is fixedly installed at the other end. The first nut head 212 has a second threaded groove 213 in the middle. The shape of the first nut head 212 [such as hexagon] is convenient for a standard wrench to clamp and tighten.

[0031] Both the first rotating head 22 and the second rotating head 25 include a hemispherical head 223. A second nut head 222 is fixedly installed at one end of the hemispherical head 223. A third threaded groove 221 is opened in the middle of the second nut head 222 and the hemispherical head 223. The threaded groove matches the thread of the ball head connecting screw 1, thereby realizing the threaded installation and fixation of the rotating head on the screw. The shape of the second nut head 222 is also convenient for wrench operation.

[0032] On one end face of the pressure-resistant pad 24 near the second rotating head 25, a second hemispherical groove 241 is provided. The shape of the second hemispherical groove 241 matches the hemispherical head 223 of the second rotating head 25 to accommodate and fit the hemispherical head.

[0033] The outer wall of the support sleeve 23 is machined with an external thread 232, which matches the first thread groove 211 in the steel bar off-axis sleeve 21, so that the two can be threadedly connected. At one end of the support sleeve 23 near the pressure-resistant pad 24, a third nut head 233 is installed to facilitate the use of tools during installation. At the other end of the support sleeve 23, that is, the middle part of the end away from the pressure-resistant pad 24, a first hemispherical groove 231 is opened. The shape of the groove matches the hemispherical head 223 of the first rotating head 22, so as to accommodate and fit the hemispherical head.

[0034] Working principle:

[0035] The following describes the assembly steps in detail, taking the installation of the steel bar off-axis connector 2 at the left end of the ball joint connecting screw 1 as an example:

[0036] Install the second rotating head: Screw the second rotating head 25 into the predetermined position on the ball joint connecting screw 1 through the third threaded groove 221 in its middle (usually near the middle);

[0037] Install the anti-compression gasket: Fit the anti-compression gasket 24 onto the ball head connecting screw 1 and push it along the screw so that its second hemispherical groove 241 fits against the hemispherical head 223 of the installed second rotating head 25;

[0038] Install the support sleeve and the first rotating head: First, put the support sleeve 23 into the ball head connecting screw 1 from the end with the first hemispherical groove 231. Then, screw the first rotating head 22 into the left end of the ball head connecting screw 1 through its third thread groove 221 and tighten it until its hemispherical head 223 is completely embedded in the first hemispherical groove 231 of the support sleeve 23.

[0039] Connecting the off-axis sleeve of the reinforcing bar: Screw the end of the off-axis sleeve 21 with the first threaded groove 211 into the external thread 232 of the support sleeve 23, and tighten it by turning the first nut head 212 or the third nut head 233 with a tool.

[0040] Connecting precast steel bars: Screw the steel bars protruding from the precast component [with external threads already machined at the ends] into the second threaded groove 213 on the first nut head 212 at the other end of the steel bar off-axis sleeve 21, and tighten them with a wrench;

[0041] The steel bar off-axis connector 2 at the other end of the ball joint connecting screw 1 is installed symmetrically in exactly the same way. Finally, the steel bars on the two prefabricated components are respectively connected to the two ends of this connector.

[0042] When there is an angular deviation between the precast steel bars to be connected on both sides, the hemispherical head 223 of the first rotating head 22 can rotate within the first hemispherical groove 231 of the support sleeve 23, and at the same time, the hemispherical head 223 of the second rotating head 25 can rotate within the second hemispherical groove 241 of the compression pad 24. The two spherical pairs work together to allow relative deflection between the ball head connecting screw 1 and the steel bar off-axis sleeve 21, thereby adaptively compensating for the relative axis and angular deviation of the steel bars.

[0043] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A mechanical connector for reinforcing bars in precast components, characterized in that: Includes a ball-head connecting screw (1), and a set of steel bar off-axis connectors (2) are symmetrically installed at both ends of the ball-head connecting screw (1); The rebar off-axis connector (2) includes a rebar off-axis sleeve (21). A support sleeve (23) is installed at one end of the rebar off-axis sleeve (21) near the middle of the ball-head connecting screw (1). A first rotating head (22) is installed on the ball-head connecting screw (1). The first rotating head (22) is located in the inner cavity of the rebar off-axis sleeve (21). A second rotating head (25) with the same structure as the first rotating head (22) is also installed on the ball-head connecting screw (1). A pressure-resistant gasket (24) is sleeved in the middle of the ball-head connecting screw (1). The pressure-resistant gasket (24) is located between the support sleeve (23) and the second rotating head (25).

2. A mechanical connector for reinforcing bars in precast components according to claim 1, characterized in that: The steel bar off-axis sleeve (21) has a first threaded groove (211) in the inner cavity of the end where the support sleeve (23) is located. The other end of the steel bar off-axis sleeve (21) is fixedly installed with a first nut head (212), and a second threaded groove (213) is opened in the middle of the first nut head (212).

3. A mechanical connector for reinforcing bars in precast components according to claim 2, characterized in that: The first rotating head (22) and the second rotating head (25) both include a hemispherical head (223). A second nut head (222) is fixedly installed at one end of the hemispherical head (223). A third threaded groove (221) for threaded installation of a matching ball head connecting screw (1) is opened in the middle of the second nut head (222) and the hemispherical head (223).

4. A mechanical connector for reinforcing bars in precast components according to claim 3, characterized in that: The pressure-resistant pad (24) has a second hemispherical groove (241) at one end near the second rotating head (25) to match its upper hemispherical head (223).

5. A mechanical connector for reinforcing bars in precast components according to claim 4, characterized in that: The outer wall of the support sleeve (23) is provided with an external thread (232) that matches the first thread groove (211). The support sleeve (23) is provided with a third nut head (233) at one end near the pressure-resistant gasket (24). The other end of the support sleeve (23) is provided with a first hemispherical groove (231) that matches the upper hemispherical head (223) of the first rotating head (22).

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