Connecting sleeve along with shape of reinforcing steel bar

Abstract

The utility model provides a connecting sleeve along with the shape of a steel bar. The connecting sleeve comprises an outer sleeve and an inner sleeve, the two ends of an inner cavity of the outer sleeve are each connected with a lock nut through threads, and the two lock nuts are not completely screwed into the inner cavity of the outer sleeve. The length of the inner sleeve is larger than that of the outer sleeve, the inner sleeve is inserted into inner cavities of the two lock nuts in a sliding fit mode, a middle cavity is formed between the two lock nuts, and the middle cavity is filled with a plurality of steel balls. The two ends of the inner sleeve are insertion ends of two steel bars to be connected respectively, and the ends of the two steel bars to be connected can be inserted into an inner cavity of the inner sleeve from the two insertion ends in a sliding fit mode respectively. Complex steel bar thread machining is not needed, constraint of large-scale special equipment can be eliminated, and steel bar connection can be efficiently and reliably completed.

Description

Technical Field

[0001] This utility model relates to the field of rebar connection technology, and specifically to a connecting sleeve that conforms to the shape of the rebar. Background Technology

[0002] In nuclear power, construction, and other engineering fields, connecting reinforcing bars using sleeves is a crucial operational step. Currently, reinforcing bar connecting sleeves are mainly divided into threaded and threadless types. Threaded sleeves include straight thread sleeves, tapered thread sleeves, U-sleeves, double thread sleeves, and adjustable sleeves. These types of sleeves require pre-processing threads on the reinforcing bars, and the thread-sleeve fit requirements are high. The processing procedures are complex, the time cycle is long, and the installation efficiency is relatively low, resulting in a low overall cost-effectiveness. Threadless sleeves include tapered extrusion split sleeves and cold extrusion sleeves (S-type sleeves). Although these sleeves do not require pre-processing threads on the reinforcing bars, saving processing time, special equipment is needed on the construction site to apply external force to the sleeve to deform it and wrap around the reinforcing bars. Because this special equipment is large, it is very inconvenient to use, and the on-site operation is labor-intensive, resulting in low work efficiency. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a connecting sleeve that conforms to the shape of the reinforcing bar, which is in response to the shortcomings of the existing technology. It does not require complicated reinforcing bar thread processing, can get rid of the constraints of large special equipment, and can complete the reinforcing bar connection efficiently and reliably.

[0004] To solve the above-mentioned technical problems, the present invention includes:

[0005] A connecting sleeve conforming to the shape of a reinforcing bar includes an outer sleeve and an inner sleeve. The inner cavity of the outer sleeve has a locking nut threaded to each end, but neither nut is fully screwed into the inner cavity of the outer sleeve. The inner sleeve is longer than the outer sleeve and is slidably inserted into the inner cavities of the two locking nuts, forming an intermediate cavity filled with multiple steel balls. The two ends of the inner sleeve are the insertion ends of two reinforcing bars to be connected, and the ends of the two reinforcing bars can be slidably inserted into the inner cavity of the inner sleeve from these two insertion ends.

[0006] Furthermore, at least one end of the inner sleeve passes through the corresponding lock nut.

[0007] Furthermore, when two lock nuts pass through both ends of the inner sleeve, the two lock nuts are symmetrically arranged at both ends of the outer sleeve.

[0008] Furthermore, when only one end of the inner sleeve penetrates the corresponding lock nut, the other end of the inner sleeve does not detach from the inner cavity of the other lock nut.

[0009] Furthermore, the length of the intermediate cavity is 4-6 times the bottom diameter of the reinforcing bars to be connected.

[0010] Furthermore, the inner cavity of the outer sleeve is cylindrical, and both ends of the inner cavity are provided with internal threads, and one end of the lock nut is provided with an external thread that matches the internal thread.

[0011] Furthermore, the other end of the lock nut is provided with an external hexagon.

[0012] Furthermore, both the inner and outer surfaces of the inner sleeve are cylindrical, and the inner cavity of the lock nut is cylindrical; the inner diameter of the lock nut is equal to or slightly larger than the outer diameter of the inner sleeve, and the inner diameter of the inner sleeve is equal to or slightly larger than the outer diameter of the reinforcing bar to be connected.

[0013] Furthermore, the diameter of the steel ball is no greater than half the thickness of the intermediate cavity.

[0014] Furthermore, the thickness of the inner sleeve is less than the diameter of the steel ball.

[0015] The beneficial effects of this utility model are:

[0016] This utility model's connecting sleeve, which conforms to the shape of the reinforcing bar, eliminates the need for pre-processing threads on the reinforcing bar, avoiding complex and time-consuming threading procedures and improving the efficiency of preliminary preparations. The reinforcing bar connection process of this utility model is relatively simple: after inserting the ends of the two reinforcing bars into place from both ends of the inner sleeve, the inner sleeve is pulled out, and then the two lock nuts are tightened. This compresses the readily flowing steel balls in the middle cavity. Under the pressure of the two lock nuts, the steel balls flow with the shape of the reinforcing bar, wrapping around it and quickly filling the transverse ribs of the two reinforcing bars, thus clamping the reinforcing bars and completing a reliable connection. This ensures, to a certain extent, the strength and stability of the reinforcing bar connection.

[0017] Compared to traditional conical sleeve extrusion split sleeves or cold extrusion sleeves, which require large-volume specialized equipment for on-site operations, this utility model only requires a small specialized wrench to easily complete the connection operation. Therefore, it has a lower dependence on equipment, is easy to use in different construction environments, improves construction flexibility, and also improves installation efficiency to a certain extent. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the connecting sleeve of this utility model before installation, which follows the shape of the reinforcing bar.

[0019] Figure 2 This is a schematic diagram of the connecting sleeve of this utility model after installation, which follows the shape of the reinforcing bar.

[0020] Figure 3 This is a schematic diagram of the structure of the sleeve body of this utility model;

[0021] In the diagram: 1. Lock nut, 11. External thread, 12. External hexagon, 2. Outer sleeve, 21. Internal thread, 3. Steel ball, 4. Inner sleeve, 5. Fixed end reinforcing bar, 6. Movable end reinforcing bar. Detailed Implementation

[0022] To facilitate understanding of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. Those skilled in the art should understand that the described embodiments are merely illustrative and should not be construed as limiting the scope of this utility model.

[0023] like Figure 1-3 As shown, this utility model provides a connecting sleeve that conforms to the shape of a reinforcing bar, including an outer sleeve 2 and an inner sleeve 4; the inner cavity of the outer sleeve 2 is threaded to a lock nut 1 at each end, and neither of the two lock nuts 1 is fully screwed into the inner cavity of the outer sleeve 2; the length of the inner sleeve 4 is greater than the length of the outer sleeve 2, and the inner sleeve 4 is slidably inserted into the inner cavity of the two lock nuts 1, forming an intermediate cavity between the two lock nuts 1, and the intermediate cavity is filled with a plurality of steel balls 3; the two ends of the inner sleeve 4 are the insertion ends of the two reinforcing bars to be connected, and the ends of the two reinforcing bars to be connected can be slidably inserted into the inner cavity of the inner sleeve 4 from the two insertion ends respectively.

[0024] The inner cavity of the outer sleeve 2 is cylindrical, and both ends of the inner cavity are provided with internal threads 21. The outer end of the lock nut 1 is provided with an external thread 11 that matches the internal threads 21. The lock nut 1 and the outer sleeve 2 are designed with standardized threads, which facilitates installation and ensures a tight connection. The fact that neither lock nut 1 is fully screwed into the inner cavity of the outer sleeve 2 means that before the rebar is connected, the external threads 11 of the two lock nuts 1 are not fully screwed into the internal threads 21 at both ends of the inner cavity of the outer sleeve 2, leaving room for adjustment during subsequent construction. In this way, after the inner sleeve 4 is pulled out from the rebar and the steel ball 3 fills the cross rib of the rebar, the two lock nuts 1 can continue to be screwed into the outer sleeve 2 to increase the compressive force on the steel ball 3 and the rebar, thereby enhancing the firmness of the rebar connection. The other end of the lock nut 1 is provided with an external hexagon 12, which facilitates a tight fit with a wrench. Construction workers can easily apply torque to the lock nut 1 with the help of a wrench to control the tightness of the lock nut 1, ensuring the smooth operation of the entire steel bar connecting sleeve connection and meeting the needs of efficient operation on the construction site.

[0025] Both the inner and outer surfaces of the inner sleeve 4 are cylindrical, and the inner cavity of the lock nut 1 is cylindrical. The dimensions of the inner cavity of the lock nut 1 and the outer diameter of the inner sleeve 4, as well as the dimensions of the inner cavity of the inner sleeve 4 and the outer diameter of the reinforcing bar, are designed to be compatible. The inner diameter of the lock nut 1 is equal to or slightly larger than the outer diameter of the inner sleeve 4, which ensures that the inner sleeve 4 slides smoothly in the lock nut 1 while preventing excessive gaps from causing loosening of the connection, thus ensuring assembly accuracy. The inner diameter of the inner sleeve 4 is equal to or slightly larger than the outer diameter of the reinforcing bar to be connected, facilitating the smooth insertion of the reinforcing bar and the smooth removal of the inner sleeve 4.

[0026] The outer sleeve 2 and inner sleeve 4 are coaxially arranged, with an annular intermediate cavity. The steel balls 3 are typically spherical. The diameter of the steel balls 3 is no greater than half the thickness of the intermediate cavity to ensure that the steel balls 3 can move freely within the cavity while also packing tightly to fully fill the entire cavity, achieving optimal results when filling the cross ribs of the reinforcing bars. For example, the diameter of the steel balls 3 can be selected to be half the thickness of the intermediate cavity. The thickness of the inner sleeve 4 is less than the diameter of the steel balls 3. During the removal of the inner sleeve 4, the thinner inner sleeve 4 effectively prevents the steel balls 3 from accidentally falling out, maintaining the integrity of the intermediate cavity and the steel balls 3, and ensuring the smooth progress of the connection process.

[0027] At least one end of the inner sleeve 4 passes through the corresponding lock nut 1. Normally, both ends of the inner sleeve 4 pass through two lock nuts 1 respectively, and the two lock nuts 1 are symmetrically arranged at both ends of the outer sleeve 2. When only one end of the inner sleeve 4 passes through the corresponding lock nut 1, the other end of the inner sleeve 4 does not detach from the inner cavity of the other lock nut 1, so as to maintain the integrity of the intermediate cavity and prevent steel ball leakage.

[0028] Both the outer sleeve 2 and the inner sleeve 4 have sufficient length to provide a solid supporting foundation for the overall connection structure. The length of the intermediate cavity is 4-6 times the bottom diameter of the reinforcing bars to be connected. This length range ensures sufficient space to accommodate a sufficient number of steel balls 3, thereby applying compressive force to the reinforcing bars over a larger contact area during connection, effectively improving the strength of the connection. Typically, this length of intermediate cavity is completely filled with steel balls 3, which are closely arranged within the cavity. During the tightening of the lock nut 1, the compressive force can be better transferred to the reinforcing bars, ensuring good clamping force in all directions and guaranteeing the reliability of the connection.

[0029] like Figure 1As shown, the fixed-end steel bar 5 and the movable-end steel bar 6 are two steel bars to be connected. First, insert the end of the fixed-end steel bar 5 into the left end cavity of the inner sleeve 4, and then insert the end of the movable-end steel bar 6 into the right end cavity of the inner sleeve 4. The fixed-end steel bar 5 and the movable-end steel bar 6 are inserted into the middle cavity from both ends to about half the depth, and there is a gap of about two steel balls 3 diameters between the fixed-end steel bar 5 and the movable-end steel bar 6. Pull the inner sleeve 4 out from the movable-end steel bar 6. During this process, the steel balls 3 can quickly fill the cross ribs of the two steel bars. Then, with the help of a special wrench, apply a certain torque to tighten the two locking nuts 1. The length of the middle cavity will become shorter. Due to the good fluidity of the steel balls 3, the steel balls 3 in the middle cavity will flow with the shape of the steel bar and wrap around the steel bar under the squeezing action of the two locking nuts 1, thereby achieving steel bar clamping. Thus, the connection between the fixed-end steel bar 5 and the movable-end steel bar 6 is completed. Figure 2 As shown.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A profiled coupling sleeve for reinforcing steel, characterised in that, It includes an outer sleeve (2) and an inner sleeve (4); the inner cavity of the outer sleeve (2) is connected to a lock nut (1) by a thread at both ends, and neither of the two lock nuts (1) is fully screwed into the inner cavity of the outer sleeve (2); the length of the inner sleeve (4) is greater than the length of the outer sleeve (2), and the inner sleeve (4) is slidably inserted into the inner cavity of the two lock nuts (1), forming an intermediate cavity between the two lock nuts (1), and the intermediate cavity is filled with a number of steel balls (3); the two ends of the inner sleeve (4) are the insertion ends of two steel bars to be connected, and the ends of the two steel bars to be connected can be slidably inserted into the inner cavity of the inner sleeve (4) from the two insertion ends respectively.

2. A tie sleeve to follow the profile of a reinforcing bar according to claim 1, characterised in that, At least one end of the inner sleeve (4) passes through the corresponding lock nut (1).

3. A tie sleeve to follow the profile of a reinforcing bar according to claim 2, characterised in that, When the two ends of the inner sleeve (4) are respectively penetrated by two lock nuts (1), the two lock nuts (1) are symmetrically arranged at both ends of the outer sleeve (2).

4. A tie sleeve to follow the profile of a reinforcing bar according to claim 2, wherein When only one end of the inner sleeve (4) passes through the corresponding lock nut (1), the other end of the inner sleeve (4) does not detach from the inner cavity of the other lock nut (1).

5. A tie sleeve to follow the profile of a reinforcing bar according to claim 1, wherein, The length of the intermediate cavity is 4-6 times the bottom diameter of the reinforcing bars to be connected.

6. A connection sleeve following the profile of the reinforcement according to claim 1, characterized in that, The inner cavity of the outer sleeve (2) is cylindrical, and both ends of the inner cavity are provided with internal threads (21). The outer end of the lock nut (1) is provided with an external thread (11) that matches the internal thread (21).

7. A connection sleeve following the profile of a reinforcing bar according to claim 6, characterized in that The lock nut (1) has an external hexagon (12) at the other end.

8. A connection sleeve following the profile of a reinforcing bar according to claim 6, characterized in that The inner sleeve (4) is cylindrical both inside and out, and the inner cavity of the lock nut (1) is cylindrical; the inner cavity diameter of the lock nut (1) is equal to or slightly larger than the outer diameter of the inner sleeve (4), and the inner cavity diameter of the inner sleeve (4) is equal to or slightly larger than the outer diameter of the reinforcing bar to be connected.

9. A connecting sleeve conforming to the shape of a reinforcing bar according to claim 8, characterized in that, The diameter of the steel ball (3) is no greater than half the thickness of the intermediate cavity.

10. A connection sleeve to follow the profile of a reinforcing bar according to claim 8, characterized in that The thickness of the inner sleeve (4) is less than the diameter of the steel ball (3).

Images