Embedded steel bar connecting sleeve and assembly thereof

Abstract

The utility model discloses a pre-embedded steel bar connecting sleeve and component, the connecting sleeve comprises a sleeve body, the sleeve body comprises a plurality of sections of cylindrical inverted cone-shaped circular truncated cones which are integrally formed, and a transition cone-shaped step of which the diameter is small at the upper part and large at the lower part is arranged at the connecting position of two adjacent cylindrical inverted cone-shaped circular truncated cones. The outer surface of the cylindrical inverted-cone-shaped circular truncated cone on the sleeve is in an inverted cone shape, compared with a sleeve with the circular surface, the contact area between the sleeve and concrete can be increased, the binding force and the bond stress between the sleeve and the concrete are improved, and the uplift resistance between the sleeve and the concrete can be improved through the transition cone-shaped step with the diameter being small in the upper portion and large in the lower portion. And the stability of the embedded sleeve embedded in the concrete is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of steel bar connection, and more specifically to a pre-buried steel bar connection sleeve and a component thereof. Background Art

[0002] At present, in the fields of construction, railways, highways, water conservancy, aviation, ports and other engineering fields, some adopt pre-embedded sleeves in existing concrete structures, screw the connecting bars into the sleeves, and then pour concrete to ensure the effective combination of new and old concrete, such as CN219909632U-a steel bar connection sleeve device, CN216740387U-a steel bar connection sleeve, but there are the following disadvantages:

[0003] 1. The circular outer surface of the sleeve has poor bonding, bond strength and pull-out resistance with concrete, which is prone to cracking and erosion by rainwater.

[0004] 2. The sleeve has poor anti-rotation ability. When the steel bar is screwed in, it is easy to cause the sleeve to rotate synchronously, separate from the surrounding concrete, and lose the bonding and holding force with the concrete, seriously affecting the safety and durability of the connected components.

[0005] Therefore, how to provide a pre-buried steel bar connection sleeve and its components that can increase the bonding strength, grip strength, pull-out resistance and rotational resistance between the connection sleeve and concrete is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0006] In view of this, the utility model provides a pre-buried steel bar connection sleeve and its components which can increase the bonding force, holding force, pull-out resistance and rotation resistance between the connection sleeve and concrete.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A pre-buried steel bar connection sleeve comprises a sleeve body, wherein the sleeve body comprises a plurality of integrally formed cylindrical inverted cone-shaped truncated cones, and a transition cone-shaped step with a smaller diameter at the top and a larger diameter at the bottom is provided at the connection position of two adjacent cylindrical inverted cone-shaped truncated cones.

[0009] It can be seen from the above technical scheme that compared with the prior art, the utility model discloses a pre-embedded steel bar connecting sleeve, wherein the outer surface of the cylindrical inverted cone-shaped truncated cone is an inverted cone, which can increase the contact area with the concrete compared to the sleeve with a circular surface, improve the bonding and holding force between the sleeve and the concrete, and the transition conical step with a smaller diameter at the top and a larger diameter at the bottom can improve the pull-out resistance between the sleeve and the concrete, thereby ensuring the stability of the pre-embedded sleeve embedded in the concrete.

[0010] Furthermore, the sleeve body also includes a cylindrical anti-rotation cone, the bottom end of which is integrally connected to the top end of the cylindrical inverted cone cone located at the top layer, and the outer peripheral wall of the cylindrical anti-rotation cone has multiple anti-rotation planes.

[0011] The beneficial effects of adopting the above technical solution are: the setting of the anti-rotation plane effectively improves the anti-rotation ability of the sleeve embedded in the concrete structure when it is screwed into the steel bar, thereby ensuring the durability of the embedded sleeve in the concrete structure.

[0012] Furthermore, the bottommost cylindrical inverted cone has the highest height.

[0013] The beneficial effect of adopting the above technical solution is: increasing the contact area between the bottom of the sleeve and the concrete, so that the sleeve can be more firmly embedded in the concrete.

[0014] A component comprises the embedded steel bar connection sleeve and a brightly colored protective plug made of EVA, wherein the protective plug is installed in the mouth of the cylindrical anti-rotation cone.

[0015] The beneficial effects of adopting the above technical scheme are: the protective plug can prevent concrete, cement slurry, dust and other debris from falling into the sleeve and affecting the screw-in installation of the rear connecting reinforcement, and when the sleeve is embedded in the concrete of the bridge or tunnel base to a certain depth, the top surface of the protective plug is flush with or slightly higher than the bridge or tunnel base, and because the protective plug is bright in color, it is easy for construction workers to quickly identify the location of the sleeve, which is convenient for subsequent milling and search and processing, and the protective plug is made of EVA material, which makes the protective plug have strong anti-aging ability and long service life.

[0016] Furthermore, the protective plug includes an inserted block and an exposed block, the top end of the inserted block and the bottom end of the exposed block are integrally formed to form a T-shaped structure, the inserted block is installed in the barrel of the cylindrical anti-rotation cone, the height of the inserted block is not less than 15 mm, and the height of the exposed block is not less than 15 mm.

[0017] The beneficial effect of adopting the above technical solution is: since the height of the exposed block is not less than 15 mm, which is far away from the milling depth of 10 mm, the 10 mm exposed block can be directly milled off without milling the embedded sleeve, which can effectively avoid the damage of the embedded sleeve to the milling machine.

[0018] Furthermore, the top surface of the exposed block is coated with a fluorescent layer.

[0019] The beneficial effects of adopting the above technical solution are: the provision of the fluorescent layer makes it easier for construction workers to find the position of the sleeve at night and facilitates milling operations at night. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of the combined assembly of the sleeve body and the protective plug in the assembly provided by the utility model.

[0022] Figure 2 It is a schematic diagram of the top view of the sleeve body.

[0023] Figure 3 It is a schematic diagram of the main structure of the protective plug.

[0024] Figure 4 A schematic diagram of the top view of the protective plug.

[0025] Figure 5 The schematic diagram of the construction of the component.

[0026] Figure 6 This is a schematic structural diagram of the combined assembly of a sleeve and a protective plug in another embodiment of the assembly provided by the utility model. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The utility model embodiment discloses a pre-embedded steel bar connection sleeve, including a sleeve body 1 made of 45# carbon steel, the total length of the sleeve body 1 is not less than 40mm, the outer diameter is not less than 24mm, the sleeve body 1 includes a plurality of sections of integrally formed cylindrical inverted cone-shaped truncated cones 11, and a transition cone-shaped step 12 with a smaller diameter at the top and a larger diameter at the bottom is provided at the connection position of two adjacent cylindrical inverted cone-shaped truncated cones 11.

[0029] In some embodiments, the sleeve body 1 further comprises a cylindrical anti-rotation cone 13 , the bottom end of which is integrally connected to the top end of the cylindrical inverted cone cone 11 on the uppermost layer, and the outer peripheral wall of the cylindrical anti-rotation cone 13 has a plurality of anti-rotation planes 131 .

[0030] The bottom layer of the cylindrical inverted cone truncated cone 11 has the highest height. Figure 1Among the three sections of cylindrical inverted cone-shaped truncated cones, the height (20-23 mm) of the cylindrical inverted cone-shaped truncated cone 11 of the lowest layer is higher than the height (15-19 mm) of the cylindrical inverted cone-shaped truncated cones of the upper two layers.

[0031] The utility model provides a component, comprising a pre-buried steel bar connection sleeve and a protection plug 2 with a bright color (such as red) and made of EVA. The protection plug 2 is installed in the tube mouth of a cylindrical anti-rotation cone 13.

[0032] The protective plug 2 includes an inserted block 21 and an exposed block 22. The top of the inserted block 21 and the bottom of the exposed block 22 are integrally formed to form a T-shaped structure. The inserted block 21 is inserted into the mouth of the cylindrical anti-rotation cone 13. The height of the inserted block 21 is not less than 15 mm, and the height of the exposed block 22 is not less than 15 mm.

[0033] In a preferred embodiment, the top surface of the exposed block 22 is coated with a fluorescent layer 221 .

[0034] Before construction, the connecting sleeve 1, the protective plug 2 and the connecting steel bar 3 are assembled into one piece in advance, that is, the connecting steel bar 3 is screwed to the lower end of the connecting sleeve 1, and the protective plug 2 is installed at the upper end of the connecting sleeve 1; during the construction and installation process, the connecting steel bar of the pre-embedded sleeve in the bridge is spot welded to the steel bar in the beam body, and the connecting steel bar of the pre-embedded sleeve in the tunnel base is directly inserted into the concrete before initial setting. For details, see the attached Figure 5 The top surface of the protective plug should be flush with or slightly higher than the beam surface or tunnel base to facilitate later identification, and the allowable deviations in the vertical and longitudinal and transverse positions should meet the design requirements.

[0035] Before installing the rear connecting reinforcement 4, it is necessary to carry out concrete surface milling on the beam surface and the tunnel base, and the milling depth should be not less than 10mm. After milling, the protective plugs 2 of all embedded sleeves should be exposed. Use special tools or ordinary pointed cones to remove the milled protective plugs 2, and then screw in the rear connecting reinforcement 4 (the rear connecting reinforcement 4 is screwed to the upper end of the connecting sleeve 1).

[0036] In the above construction process, because the outer surface of the cylindrical inverted cone-shaped truncated cone is an inverted cone, it can increase the contact area with the concrete compared to the sleeve with a circular surface, improve the bonding and holding force between the sleeve and the concrete, and the transition cone-shaped step with a small diameter at the top and a large diameter at the bottom can improve the pull-out resistance between the sleeve and the concrete, ensuring the stability of the embedded sleeve embedded in the concrete; and the setting of the anti-rotation plane effectively improves the anti-rotation ability of the sleeve embedded in the concrete structure when it is screwed into the steel bar, ensuring the durability of the embedded sleeve in the concrete structure. In addition, since the height of the exposed block of the protective plug is not less than 15mm, which is far away from the milling depth of 10mm, the exposed block of 10mm can be directly milled off without milling the embedded sleeve, which can effectively avoid the damage of the embedded sleeve to the milling machine.

[0037] Of course, the present invention also provides another structural embodiment of the connecting sleeve, such as Figure 6 As shown, the connecting sleeve includes a sleeve 5 and a protective plug 2 installed on the sleeve mouth at one end thereof. The outer wall of the sleeve 5 is provided with a plurality of circles of fixing rings 51 spaced apart from each other. The fixing rings 51 protrude radially. After the sleeve 5 is prefabricated or cast in concrete, the fixing rings 51 are clamped in the solidified concrete to improve the pull-out resistance and the bonding strength between the sleeve and the concrete, thereby ensuring the stability and safety of the connecting sleeve.

[0038] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pre-buried steel bar connection sleeve, characterized in that: The sleeve body (1) comprises a sleeve body (1), wherein the sleeve body (1) comprises a plurality of integrally formed cylindrical inverted conical truncated cones (11), and a transitional conical step (12) with a smaller diameter at the top and a larger diameter at the bottom is provided at the connection position of two adjacent cylindrical inverted conical truncated cones (11).

2. The pre-buried steel bar connection sleeve according to claim 1, characterized in that: The sleeve body (1) further comprises a cylindrical anti-rotation cone (13), the bottom end of the cylindrical anti-rotation cone (13) being integrally connected with the top end of the cylindrical inverted cone cone (11) located at the top layer, and the outer peripheral wall of the cylindrical anti-rotation cone (13) having a plurality of anti-rotation planes (131).

3. The pre-buried steel bar connection sleeve according to claim 2, characterized in that: The bottommost cylindrical inverted cone-shaped truncated cone (11) has the highest height.

4. A component, characterized in that It comprises a pre-buried steel bar connection sleeve as claimed in claim 2 or 3 and a brightly colored protective plug (2) made of EVA, wherein the protective plug (2) is installed in the mouth of the cylindrical anti-rotation cone (13).

5. A component according to claim 4, characterized in that The protective plug (2) comprises a plug-in block (21) and an exposed block (22); the top end of the plug-in block (21) and the bottom end of the exposed block (22) are integrally formed to form a T-shaped structure; the plug-in block (21) is plugged into the mouth of the cylindrical anti-rotation cone (13); the height of the plug-in block (21) is not less than 15 mm, and the height of the exposed block (22) is not less than 15 mm.

6. A component according to claim 5, characterized in that The top end surface of the exposed block (22) is coated with a fluorescent layer (221).

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