A connecting sleeve facilitating project acceptance

Abstract

The invention discloses a connecting sleeve convenient for engineering acceptance, which relates to a steel bar connecting piece. The aim is to solve the problem that workers may directly break through the obstruction during construction, resulting in over-tightening by screwing. The key technical points are as follows: A connecting sleeve convenient for engineering acceptance includes a sleeve part. A threaded hole is provided through the sleeve part. A limiting structure is arranged in the middle section of the threaded hole of the sleeve part. The limiting structure is used to block the steel bar screwed in with low torque, and the limiting structure can be broken through by the steel bar screwed in with high torque. The connecting sleeve convenient for engineering acceptance of the invention ensures that two steel bars are tightly abutted against the middle of the threaded hole where the limiting structure is located, and further ensures the abutting position of the two steel bars.

Description

Technical Field

[0001] The invention relates to a steel bar connecting piece, and more specifically, to a connecting sleeve that facilitates project acceptance. Background Art

[0002] Mechanical connection of steel bars is a new type of steel bar connection process, known as the "third generation of steel bar joints" after binding and electric welding. It has the advantages of higher joint strength than the steel bar base material, faster speed than electric welding, no pollution, and saving steel. Currently, the mechanical connection sleeve is mainly a hollow structure with a circular shape, and the sleeve is provided with connecting threads that mesh with the threads at the end of the steel bar.

[0003] Regarding the steel bar connecting sleeve, the applicant has applied for a Chinese patent with the publication number CN218668208U, which discloses a steel bar connecting sleeve. The technical key points are as follows: It includes a sleeve part, and a threaded hole is axially penetrated through the sleeve part. The sleeve part includes an upper cylinder, and a lower cylinder formed on the upper cylinder. The outer wall of the upper cylinder is in a cylindrical structure, and a plurality of straight grooves are equiangularly arranged along the length direction of its circumferential surface. The straight grooves are used to fit the sleeve wrench, and the outer surface of the cross-section of the lower cylinder is in a polyhedron structure for fitting the jaw wrench.

[0004] The Chinese patent with the publication number CN218668208U also discloses that in order to ensure that the end faces of two steel bars are abutted to meet the national standard requirements, a midpoint hole is axially penetrated through the sleeve part perpendicular to the central axis, and a midpoint pin is inserted and fixed in the midpoint hole. Thus, the ultimate screwing-in depth of the steel bar is limited by the midpoint pin, effectively preventing one steel bar from being screwed in excessively. It should be noted that the midpoint pin is formed with a tip, so that the tip can abut on the chamfer of the screwing-in end of the steel bar, avoiding the situation that the two steel bars cannot have their end faces abutted due to the setting of the midpoint pin.

[0005] The applicant found in actual use that the above technical solution can only generate a blocking force at the moment when the steel bar is screwed into the midpoint. Workers may directly break through the block during construction, resulting in the problem of excessive screwing. Therefore, a new solution is needed to solve this problem. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the purpose of the invention is to provide a connecting sleeve that facilitates project acceptance, ensuring that two steel bars are tightly abutted in the middle of the threaded hole where the limiting structure is located.

[0007] The above technical purpose of the invention is achieved through the following technical solutions: A connecting sleeve that facilitates project acceptance includes a sleeve part. A threaded hole is penetrated through the sleeve part. A limiting structure is arranged in the middle section of the threaded hole of the sleeve part. The limiting structure is used to block the steel bar screwed in with low torque, and the limiting structure can be broken through by the steel bar screwed in with high torque.

[0008] By adopting the above technical solution, when using the present application to connect two steel bars, the two steel bars are screwed in successively with low torque until they are in preliminary contact with the limiting structure, and then the steel bars are tightened with high torque, so as to ensure that the two steel bars are tightly pressed against the middle part of the threaded hole where the limiting structure is located, having a limiting lead compared with the prior art and further ensuring the pressing position of the two steel bars.

[0009] The invention is further configured such that: the limiting structure is an internal thread damage position formed by stamping in the middle position of the threaded hole, and an extrusion deformation part is formed at the edge of the internal thread damage position.

[0010] The invention is further configured such that: the limiting structure is an additional welding point fixed to the middle position of the threaded hole by electric welding.

[0011] The invention is further configured such that: the specific number of the additional welding points is three, which are respectively located at both ends of the middle section and the center of the middle section.

[0012] The invention is further configured such that: the limiting structure is an external stamping position stamped on the outer wall of the sleeve part, and a limiting inner convex part is formed in the middle section of the threaded hole by the external stamping position.

[0013] The invention is further configured such that: the limiting structure is an adhesive layer smeared and cemented at the middle position of the threaded hole.

[0014] The invention is further configured such that: the limiting structure is a steel wire cage fitted and installed in the middle section of the threaded hole, and a steel wire cage ring groove for the steel wire cage to be embedded is formed in the middle section of the sleeve part in the threaded hole.

[0015] The invention is further configured such that: the specific number of the steel wire cages is two. Both of the two steel wire cages include a steel wire ring with a diameter not larger than that of the steel bar, and a plurality of support steel wires welded and fixed to the steel wire ring at equal angles. The support steel wires include an inclined stress-bearing section and a parallel stress-bearing section. The inclined stress-bearing section faces the steel bar screwed in from one end of the sleeve part, and the parallel stress-bearing section faces the steel bar screwed in from the other end of the sleeve part.

[0016] The invention is further configured such that: a steel bar window is formed through the sleeve part, and the parallel stress-bearing sections of the two steel wire cages are inserted into the steel bar window.

[0017] The invention is further configured such that: the steel wire cage ring groove is provided with a pressing step groove, and the depth of the pressing step groove is not larger than the diameter of the support steel wire.

[0018] In summary, the invention has the following beneficial effects: The two steel bars are pressed tightly against the middle of the threaded hole where the limiting structure is located, with a limiting advance compared to the prior art, further ensuring the pressing position of the two steel bars; The limiting structure can be formed directly by stamping, which not only meets the technical requirements of the limiting advance, but also is more convenient to process; When screwing in each steel bar, there are two points where the torque suddenly increases. The first is a prompt near the middle section, and the second is the midpoint pressing. The end surface pressing point of the two steel bars is closer to the midpoint of the sleeve part; The glue coating is set. On the premise of meeting the limiting advance, the processing is relatively simple and does not damage the thread; Using a wire cage to limit the steel bar to increase the torque before connection, and no substance will enter between the internal and external threads, that is, the increased value of the torque is more constant and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the first embodiment;

[0020] Figure 2 It is a cross-sectional view of the second embodiment;

[0021] Figure 3 It is a cross-sectional view of the third embodiment;

[0022] Figure 4 It is a cross-sectional view of the fourth embodiment;

[0023] Figure 5 It is an exploded view of the fourth embodiment. For the convenience of showing, the sleeve part in this figure is sectioned.

[0024] Figure 6 It is a cross-sectional view of the fifth embodiment;

[0025] Figure 7 For Figure 6 Enlarged view of part A, mainly showing the limiting inner convex part.

[0026] BRIEF DESCRIPTION OF THE DRAWINGS: 1. Sleeve part; 2. Threaded hole; 301. Inner thread damage position; 302. Extrusion deformation part; 311. Additional solder joint; 321. Glue coating; 331. Wire cage; 332. Wire ring; 333. Supporting wire; 334. Inclined stress section; 335. Parallel stress section; 336. Reinforcing bar window; 337. Pressing step groove; 338. Wire cage ring groove; 341. Outer stamping position; 342. Limiting inner convex part. DETAILED DESCRIPTION OF THE INVENTION

[0027] The invention will be further described in detail below with reference to the accompanying drawings.

[0028] Among them, the same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0029] Embodiment 1: A connecting sleeve facilitating engineering acceptance, as Figure 1 shown, includes a sleeve portion 1. A threaded hole 2 is provided through the sleeve portion 1. A limiting structure is arranged in the middle section of the threaded hole 2 of the sleeve portion 1. The limiting structure is used to block the steel bars screwed in with low torque, and the limiting structure can be broken through by the steel bars screwed in with high torque.

[0030] When using the present application to connect two steel bars, the two steel bars are screwed in successively with low torque until they are in preliminary contact with the limiting structure, and then the two steel bars are tightened successively with high torque, so as to ensure that the two steel bars are tightly abutted at the middle part of the threaded hole 2 where the limiting structure is located. Compared with the prior art, there is a limiting advance amount, which further ensures the abutting position of the two steel bars.

[0031] The specific structure of the limiting structure is as follows. The limiting structure is an internal thread damage position 301 formed by stamping at the middle section of the threaded hole 2. An extrusion deformation portion 302 is formed at the edge of the internal thread damage position 301; the limiting structure can be formed by direct stamping. Compared with the prior art, it not only meets the technical requirements of the limiting advance amount, but also is more convenient to process.

[0032] Embodiment 2: The difference in this embodiment lies in adopting a different limiting structure, as Figure 2 shown. The limiting structure is additional welding points 311 fixed by electric welding at the middle section of the threaded hole 2. The specific number of the additional welding points 311 is three, which are respectively located at both ends and the center of the middle section; when screwing in each steel bar, there are two points where the torque suddenly increases. The first is a prompt close to the middle section, and the second is the middle point for tight abutment. Compared with the prior art and Embodiment 1, the end face abutting points of the two steel bars are closer to the middle point of the sleeve portion 1.

[0033] Embodiment 3: The difference in this embodiment lies in adopting a different limiting structure, as Figure 3 shown. The limiting structure is an adhesive layer 321 applied and cemented at the middle section of the threaded hole 2; on the premise of meeting the limiting advance amount, the processing is relatively simple, and compared with the above two embodiments, it does not cause damage to the thread.

[0034] Embodiment 4: The difference in this embodiment lies in adopting a different limiting structure, as Figure 4 、 Figure 5As shown, the limiting structure is a wire cage 331 fitted into the middle section of the threaded hole 2 in a nested manner. The sleeve portion 1 is provided with a wire cage ring groove 338 in the middle section of the threaded hole 2 for the wire cage 331 to be embedded. Using the wire cage 331 to limit the steel bar to increase the torque before their connection, although the structure is more auxiliary and the processing difficulty is increased, no substance will enter between the internal and external threads, that is, the increased value of the torque is more constant and reliable.

[0035] It should be noted that the specific number of the wire cages 331 is two. Both wire cages 331 include a wire ring 332 with a diameter not larger than that of the steel bar, and a number of support wires 333 welded and fixed to the wire ring 332 at equal angles. The support wires 333 include an inclined stress-bearing section 334 and a parallel stress-bearing section 335. The inclined stress-bearing section 334 faces the steel bar screwed in from one end of the sleeve portion 1, and the parallel stress-bearing section 335 faces the steel bar screwed in from the other end of the sleeve portion 1. When the two steel bars are screwed in successively until they abut against the inclined stress-bearing section 334, the first torque increase occurs. During the process of screwing in the first steel bar with a large torque, the support wires 333 are gradually expanded until the wire ring 332 is broken and abuts against the parallel stress-bearing section 335 of another wire cage 331, resulting in the second torque increase and restricting the first steel bar from being further screwed in. By screwing in the second steel bar with a large torque until it abuts against the first steel bar, it can be ensured that the two steel bars abut tightly at the midpoint of the sleeve portion 1.

[0036] To prevent the first wire cage 331 from squeezing the other wire cage 331, the sleeve portion 1 is provided with a steel bar window 336 penetrating through it. The parallel stress-bearing sections 335 of the two wire cages 331 are inserted into the steel bar window 336, so that when the support wires 333 of the first wire cage 331 are squeezed and deformed, the deformation amount can extend outwards through the steel bar window 336, thereby avoiding the first wire cage 331 squeezing the other wire cage 331 during the deformation process. It should also be noted that during the project acceptance, the acceptance party can ensure that the two steel bars abut tightly at the midpoint of the sleeve portion 1 by observing whether there are two support wires 333 ejected from the steel bar window 336.

[0037] To ensure the installation stability of the wire cage 331, a pressing step groove 337 is formed in the wire cage ring groove 338. The depth of the pressing step groove 337 is not greater than the diameter of the support wire 333. Thus, combined with the insertion of the parallel stress-bearing section 335 into the steel bar window 336, the two ends of the wire cage 331 are restricted, effectively ensuring its installation stability.

[0038] Embodiment 5: The difference in this embodiment is that a different limiting structure is adopted, such as Figure 6 、 Figure 7As shown, the limiting structure is an external stamping position 341 stamped on the outer wall of the sleeve portion 1, and the external stamping position 341 forms a limiting inner convex portion 342 in the middle section of the threaded hole 2; adopting the method of external stamping to form the limiting structure has the technical effect of more convenient processing compared with the prior art and Embodiment 1.

[0039] Specific embodiments are only explanations of the invention, and they do not limit the invention. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as they are within the scope of the claims of the invention, they are protected by the patent law.

Claims

1. A connecting sleeve facilitating engineering acceptance, comprising a sleeve part (1), and a threaded hole (2) is penetratingly arranged in the sleeve part (1), characterized in that: A limiting structure is provided in the middle section of the threaded hole (2) of the sleeve portion (1). The limiting structure is a wire cage (331) fitted and installed in the middle section of the threaded hole (2). A wire cage ring groove (338) for the wire cage (331) to be embedded is provided in the middle section of the threaded hole (2) of the sleeve portion (1). The specific number of the wire cages (331) is two. Both of the two wire cages (331) include a wire ring (332) with a diameter not larger than that of the steel bar, and a plurality of support wires (333) welded and fixed to the wire ring (332) at equal angles. The support wires (333) include an inclined stress-bearing section (334) and a parallel stress-bearing section (335). The inclined stress-bearing section (334) faces the steel bar screwed in from one end of the sleeve portion (1), and the parallel stress-bearing section (335) faces the steel bar screwed in from the other end of the sleeve portion (1). The sleeve portion (1) is provided with a steel bar window (336) penetrating through it. The parallel stress-bearing sections (335) of the two wire cages (331) are inserted into the steel bar window (336). The wire cage ring groove (338) is provided with a pressing step groove (337), and the depth of the pressing step groove (337) is not larger than the diameter of the support wire (333).

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