Self-locking sleeve for prefabricated part steel bar connection

Abstract

The utility model discloses a self-locking sleeve for prefabricated part steel bar connection, which comprises a reserved steel bar and a post-inserted steel bar, the top of the reserved steel bar is connected with a sleeve body, and the sleeve body is at least used for being fixedly connected with the reserved steel bar; a core sleeve connecting piece is inserted into the top end of the sleeve body, and the sleeve body and the core sleeve connecting piece are detachably connected; the rear insertion steel bar is inserted into the core sleeve connecting piece, and the core sleeve connecting piece is at least used for being fixedly connected with the rear insertion steel bar. The sleeve body is fixedly connected with a reserved reinforcing steel bar, the core sleeve connecting piece is fixedly connected with a post-inserted reinforcing steel bar, and the core sleeve connecting piece is inserted into the sleeve body in a threaded mode, so that connection between the post-inserted reinforcing steel bar and the reserved reinforcing steel bar is achieved, and mechanical connection of prefabricated component reinforcing steel bars is achieved. And the mechanical occlusion effect of the steel bar, the sleeve and the core sleeve connecting piece is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fabricated building, specifically relates to a self-locking sleeve for prefabricated component steel bar connection. BACKGROUND

[0002] Fabricated building is a kind of fast, efficient, environmental protection building mode, has obtained the rapid promotion and large application at present. Steel bar sleeve grouting connection technology is one of main and mature connection modes in prefabricated assembly type concrete structure, is most widely used at present. Through embedding grouting sleeve in component in advance, high-strength non-shrinkage grouting material is injected after on-site installation, to realize the effective and reliable connection of steel bars between prefabricated components, ensure the integrity and bearing capacity of whole structure.

[0003] But there are following problems in steel bar sleeve grouting connection in fabricated concrete structure:

[0004] 1. Grouting quality control is difficult, and quality defects such as grouting not dense are prone to occur:

[0005] Ensuring grouting quality is an industry problem, and the compactness of grouting material directly affects the steel bar connection quality during grouting process, and then affects the structure safety. If grouting is not full or has air bubbles and voids, the effective bonding area between steel bars and between steel bar and sleeve will be reduced, resulting in construction quality defects, and then affecting the overall bearing capacity of structure.

[0006] However, due to the limitation of narrow space inside the sleeve, it is very difficult to ensure that the grouting material is completely filled and dense. The internal space of the sleeve has complex structures of various shapes and sizes, including but not limited to steel bars of different diameters, different steel rib shapes, and the geometric design of the sleeve itself. These complex structures greatly increase the difficulty of grouting material flowing and fully filling each part during grouting process.

[0007] 2. Affected by grouting material performance and construction technology:

[0008] Mainly affected by grouting material performance and construction technology. The construction of grouting material is difficult, and requires certain technical training and construction experience, and the cost is high. The performance of grouting material is crucial, including fluidity, early strength, late strength, etc., and the quality of grouting material directly affects the performance of steel bar connection. Improper selection and proportioning of grouting material will result in that the grouting body cannot achieve the designed mechanical properties after hardening. If the quality of the used slurry does not meet the relevant standards, the durability, impermeability and corrosion resistance of the connection will be insufficient, affecting the long-term stability of the structure.

[0009] Grouting operation needs professional technology and equipment support, such as grouting pressure control, grouting sequence, grouting port plugging, etc., and any operation error will lead to grouting failure.

[0010] ③Grouting quality detection is difficult, and there is no effective detection means:

[0011] Grouting quality detection is difficult in building engineering, and the internal grouting of the prefabricated component after grouting cannot be directly observed. At present, although there are common detection methods such as ultrasonic detection and core drilling sampling detection, these methods have limitations, such as the non-destructive detection means such as ultrasonic detection is easily affected by the thickness and surface condition of the concrete, and the core drilling sampling detection is destructive and time-consuming, and directly damages the building structure. Therefore, there is no effective detection means at present. And the quality problem is found late: if the grouting quality has problems, it may not be found until the structure is used for a period of time, such as cracks, leakage or insufficient bearing capacity, etc., at which time the cost of repair will be greatly increased.

[0012] The detection standard is not perfect: the quality acceptance standard and specification for steel sleeve grouting connection in prefabricated building are still being improved, and there is a certain uncertainty in the quality control and acceptance work in actual engineering.

[0013] ④Affected by environmental conditions:

[0014] During grouting construction, environmental conditions such as construction temperature and humidity have an impact on its quality. High or low temperature may cause changes in grouting flowability, slow hardening speed or incomplete hardening, while low humidity may cause dry shrinkage cracks. In low temperature weather, the grouting temperature is lower than 0℃, and insulation measures need to be taken for on-site construction. When the grouting temperature is lower than -5℃, on-site grouting operation cannot be carried out.

[0015] Therefore, in order to ensure the grouting quality and engineering safety, the environmental conditions need to be fully evaluated before construction, and appropriate temperature control and humidity adjustment measures need to be taken to reduce their impact.

[0016] ⑤Environmentally unfriendly:

[0017] The use of grouting material for construction faces the disadvantage of environmental unfriendliness, mainly in the noise and vibration interference in the construction process, air pollution in the production process of grouting material, and environmental pollution that may be caused by grouting material treatment and waste. Construction noise and vibration are generated during construction, and pollutants such as carbon dioxide and sulfur dioxide are emitted during the production of grouting materials, as well as overexploitation of natural resources such as sand and stone.

[0018] In order to overcome the above problems, the applicant proposes a self-locking sleeve for prefabricated component steel bar butt joint connection, which avoids sleeve grouting and overcomes the shortcomings of steel sleeve grouting connection. Practical new type content

[0019] The utility model discloses a purpose provides a kind of self-locking sleeve for prefabricated component reinforcing bar connection, to solve the above insufficient place in prior art.

[0020] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme:

[0021] A kind of self-locking sleeve for prefabricated component reinforcing bar connection, including reserved reinforcing bar and post-inserted reinforcing bar, the top of the reserved reinforcing bar is connected with sleeve body, the sleeve body is at least used to be fixedly connected with reserved reinforcing bar;

[0022] The top end inside of the sleeve body is inserted with core sleeve connecting piece, and the sleeve body and core sleeve connecting piece are detachably connected;

[0023] The post-inserted reinforcing bar is inserted in the inside of core sleeve connecting piece, and the core sleeve connecting piece is at least used to be fixedly connected with post-inserted reinforcing bar.

[0024] As the preferred scheme of the application, the top end of the reserved reinforcing bar is provided with reinforcing bar wire head, and the length of the reinforcing bar wire head is at least 3cm.

[0025] As the preferred scheme of the application, the reserved reinforcing bar is formed into reinforcing bar wire head by threading processing;

[0026] The outer thread of the reinforcing bar wire head is sleeved with wire head protection cap.

[0027] As the preferred scheme of the application, the reserved reinforcing bar and post-inserted reinforcing bar are both cylindrical threaded steel bars.

[0028] As the preferred scheme of the application, the top end and the bottom end of the sleeve body are both provided with threaded hole, and the outer side of the sleeve body is both provided with tool face located outside the threaded hole;

[0029] The tool face is hexagonal structure.

[0030] As the preferred scheme of the application, the core sleeve connecting piece includes threaded column, the bottom of the threaded column is provided with integral clamping piece, and the number of the integral clamping piece is 4-6;

[0031] A plurality of clamping teeth that are equidistantly distributed are arranged on the inner wall of the integral clamping piece, and the clamping teeth are downwardly inclined structures.

[0032] The top of the threaded column is fixedly provided with limit stop piece.

[0033] The middle part of the threaded column and limit stop piece is both provided with through hole.

[0034] In the above technical scheme, the self-locking sleeve for prefabricated component reinforcing bar connection has the beneficial effects that:

[0035] The fixed connection between the sleeve body and the reserved steel bar is achieved, the fixed connection between the sleeve body and the post-insertion steel bar is achieved through the core sleeve connector, the core sleeve connector is screwed into the inside of the sleeve body, thereby achieving the connection between the post-insertion steel bar and the reserved steel bar, realizing the mechanical connection of the steel bar of the prefabricated component, and improving the mechanical biting effect of the steel bar and the sleeve sleeve and the core sleeve connector.

[0036] ①Realize grouting-free connection: Grouting-free connection brings many significant benefits. The self-locking sleeve realizes the mechanical connection and effective force transmission of the steel bar, improving the construction speed of the prefabricated component. No grouting of the sleeve is required, so it is not affected by the grouting quality, grouting material performance, grouting construction process and environmental conditions, and the safety of the structure is improved. Grouting-free connection provides a modern, efficient and environmentally friendly construction method for prefabricated buildings.

[0037] ②Simplify the construction process and improve efficiency:

[0038] Since the reserved steel bar of the prefabricated component is mechanically connected with the post-insertion steel bar, the steel bar is inserted into the sleeve, the steel bar connection is completed, and the force transmission between the steel bars is realized. Avoiding subsequent grouting construction process, it can simplify the construction process, improve the construction efficiency, greatly shorten the construction period, and thus reduce the overall project cost.

[0039] ③Green and environmentally friendly, reduce carbon emissions:

[0040] Reducing the use of grouting materials helps to reduce the carbon footprint of buildings and meets the requirements of sustainable development. Compared with traditional sleeve grouting connection, the shift to grouting-free connection technology in traditional prefabricated buildings shows significant green and environmentally friendly and carbon emission reduction advantages. Grouting-free connection reduces dust pollution on the construction site by reducing wet work and avoiding on-site mixing of grouting materials, protecting workers' health and saving water resources. At the same time, this technology reduces material waste through precise and efficient connection methods, further reducing environmental burden. In addition, grouting-free connection reduces energy consumption, including mechanical use and power consumption, and thus reduces carbon emissions throughout the building life cycle. This shift not only helps to promote green buildings and sustainable buildings, but also reduces carbon emissions due to construction and grouting material preparation, thereby significantly reducing environmental burden. In summary, the application of grouting-free connection technology in prefabricated buildings not only promotes environmental protection and energy saving, but also provides strong support for the transformation of the building industry towards a greener and more sustainable future.

[0041] ④Reduce costs:

[0042] On the one hand, the grouting-free connection saves grouting materials and related labor costs, reducing the amount of work on site and thus reducing labor costs and construction period costs. At the same time, since the connection is no longer dependent on the grouting process, not only is the cost of grouting materials itself saved, but additional costs required during the purchase, transportation, mixing, and maintenance after grouting are also avoided.

[0043] On the other hand, the self-locking sleeve has a simple structure, and the manufacturing material is ordinary steel, which is simple in process. The processing, manufacturing, production, and transportation costs of the self-locking sleeve itself are greatly reduced.

[0044] In summary, the self-locking sleeve developed by the applicant has significant advantages for the butt joint connection of reinforcing bars in prefabricated buildings. It can effectively overcome the problems existing in traditional sleeve grouting connection, improve construction efficiency, reduce costs, and enhance structural safety. This innovative connection method is expected to promote the further development and application of prefabricated building technology.

[0045] It is meaningful and has great engineering application prospect to apply the self-locking sleeve technology to the prefabricated and assembled concrete structure. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0047] Figure 1 A structural perspective view is provided for an embodiment of the self-locking sleeve for reinforcing bar connection of prefabricated components of the present application.

[0048] Figure 2 A structural cross-sectional view is provided for an embodiment of the self-locking sleeve for reinforcing bar connection of prefabricated components of the present application.

[0049] Figure 3 An exploded view is provided for an embodiment of the self-locking sleeve for reinforcing bar connection of prefabricated components of the present application.

[0050] Figure 4 A sleeve body and core sleeve connecting piece structure schematic view is provided for an embodiment of the self-locking sleeve for reinforcing bar connection of prefabricated components of the present application.

[0051] Figure 5 A core sleeve connecting piece structure cross-sectional view is provided for an embodiment of the self-locking sleeve for reinforcing bar connection of prefabricated components of the present application.

[0052] 1, reserved steel bar; 11, steel bar wire head; 12, wire head protection cap; 2, rear inserted steel bar; 3, sleeve body; 31, threaded hole; 32, tool face; 4, core sleeve connecting piece; 41, threaded column; 42, limiting baffle; 43, via hole; 44, integral clamping piece; 45, clamping piece tooth. DETAILED DESCRIPTION

[0053] In order to make the technical personnel in the art better understand the technical scheme of the utility model, the utility model will be further described in detail below with the drawings.

[0054] As Figures 1-5 The utility model discloses an embodiment provides a kind of self-locking sleeve for prefabricated component steel bar connection, including reserved steel bar 1 and rear inserted steel bar 2, the top of reserved steel bar 1 is connected with sleeve body 3, sleeve body 3 is at least used to be connected with the fixed connection of reserved steel bar 1;The top end inside sleeve body 3 is inserted with core sleeve connecting piece 4, sleeve body 3 and core sleeve connecting piece 4 are detachably connected;Rear inserted steel bar 2 is inserted in the inside of core sleeve connecting piece 4, and core sleeve connecting piece 4 is at least used to be connected with the fixed connection of rear inserted steel bar 2.

[0055] In the embodiment, including reserved steel bar 1 and rear inserted steel bar 2;

[0056] Specifically, the top end of the reserved steel bar 1 is provided with a steel bar wire head 11, and the length of the steel bar wire head 11 is at least 3 cm, and the length of the steel bar wire head 11 is preferably 4 cm, so as to ensure the connection strength between the steel bar wire head 11 and the sleeve body 3.

[0057] Specifically, the reserved steel bar 1 is formed into a steel bar wire head 11 by thread machining.

[0058] Specifically, the steel bar wire head 11 is externally threaded with a wire head protection cap 12, and the wire head protection cap 12 should be immediately put on after the steel bar wire head 11 is machined, so as to prevent the damage of the wire head during the installation and removal of the steel bar.

[0059] The reserved steel bar 1 and the rear inserted steel bar 2 are both cylindrical threaded steel bars.

[0060] In the embodiment, the top of the reserved steel bar 1 is connected with the sleeve body 3, and the sleeve body 3 is at least used to be connected with the fixed connection of the reserved steel bar 1.

[0061] Specifically, the top end and the bottom end of the sleeve body 3 are both provided with threaded holes 31, and the outer side of the sleeve body 3 is both provided with tool faces 32 located outside the threaded holes 31, and the reserved steel bar 1 can be tightened by using a pipe wrench when being installed, and the steel bar wire head 11 of the reserved steel bar 1 should be mutually tightly pressed at the central position of the threaded hole 31 at the bottom of the sleeve body 3.

[0062] Specifically, the tool face 32 is a hexagonal structure, which is matched with a tool wrench to make the connection between the sleeve body 3 and the reserved steel bar 1 more reliable.

[0063] In this embodiment, the sleeve body 3 is internally inserted with the core sleeve connector 4, and the sleeve body 3 and the core sleeve connector 4 are detachably connected.

[0064] Specifically, the core sleeve connector 4 includes a threaded column 41, and the bottom of the threaded column 41 is provided with integral clamping pieces 44. After the core sleeve connector 4 is screwed into the sleeve body 3, the integral clamping pieces 44 are gathered, which improves the connection capacity with the rear inserted steel bar 2. The number of the integral clamping pieces 44 is 4-6, and the number of the integral clamping pieces 44 is preferably 4.

[0065] Specifically, the inner wall of the integral clamping piece 44 is provided with a plurality of clamping teeth 45 distributed at equal distances, and the clamping teeth 45 are downwardly inclined structures, and the clamping teeth 45 lock the rear inserted steel bar 2.

[0066] Specifically, the top of the threaded column 41 is fixedly provided with a limiting baffle 42, and after the core sleeve connector 4 is completely screwed into the sleeve body 3, the limiting baffle 42 is engaged with the top outer wall of the sleeve body 3.

[0067] Specifically, the middle part of the threaded column 41 and the limiting baffle 42 is provided with a through hole 43, and the rear inserted steel bar 2 is inserted into the core sleeve connector 4 from the inside of the through hole 43, and the bottom end of the rear inserted steel bar 2 abuts against the inside of the sleeve body 3.

[0068] In this embodiment, the rear inserted steel bar 2 is inserted into the inside of the core sleeve connector 4, and the core sleeve connector 4 is at least used for fixed connection with the rear inserted steel bar 2.

[0069] The operation steps are as follows:

[0070] First step: the connecting end of the reserved steel bar 1 is subjected to steel bar threading processing, so that the steel bar of the processing section forms a thread, and a steel bar thread 11 is formed.

[0071] Second step: the reserved steel bar 1 is screwed into the threaded hole 31 at the bottom of the sleeve body 3 through the steel bar thread 11, and the mechanical connection of the reserved steel bar 1 and the sleeve body 3 is completed.

[0072] Third step: the core sleeve connector 4 is screwed into the threaded hole 31 at the top of the sleeve body 3, and is connected into a whole; the limiting baffle 42 reaching the opening edge of the top of the sleeve body 3 is qualified by visual inspection.

[0073] Fourth step: the rear inserted steel bar 2 is inserted into the core sleeve connector 4, and the rear inserted steel bar 2 is inserted into the integral clamping piece 44, and the clamping teeth 45 lock the rear inserted steel bar 2, and the steel bar connection is completed.

[0074] The steel bar rib of the rear inserted steel bar 2 is mechanically engaged with the whole clamping piece 44, and the self-locking is realized by the cooperation, the reserved steel bar 1, the rear inserted steel bar 2 and the sleeve body 3 and the core sleeve connecting piece 4 are connected.

[0075] The above only describes certain exemplary embodiments of the present application by way of illustration, without doubt, for those skilled in the art, without departing from the spirit and scope of the present application, the described embodiments can be modified in various ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the present application.

Claims

1. A self-locking sleeve for prefabricated component reinforcement connection comprising a pre-embedded reinforcement (1) and a post-inserted reinforcement (2), characterized in that, The top of the reserved steel bar (1) is connected with a sleeve body (3), which is used for fixed connection with the reserved steel bar (1) at least; The top end of the sleeve body (3) is inserted with a core sleeve connector (4), and the sleeve body (3) and the core sleeve connector (4) are detachably connected; The rear inserted steel bar (2) is inserted in the inside of the core sleeve connector (4), and the core sleeve connector (4) is used for fixed connection with the rear inserted steel bar (2) at least.

2. A self-locking sleeve for use in the connection of reinforcing bars for prefabricated components according to claim 1, characterized in that The top end of the reserved steel bar (1) is provided with a steel bar thread end (11), and the length of the steel bar thread end (11) is at least 3 cm.

3. A self-locking sleeve for use in the connection of reinforcing bars for prefabricated components according to claim 2, characterized in that The reserved steel bar (1) is processed by threading to form the steel bar thread end (11); The outside of the steel bar thread end (11) is sleeved with a thread protection cap (12).

4. A self-locking sleeve for use in the connection of reinforcing bars for prefabricated components according to claim 1, characterized in that The reserved steel bar (1) and the rear inserted steel bar (2) are both cylindrical threaded steel bars.

5. A self-locking sleeve for use in the connection of reinforcing bars for prefabricated components according to claim 1, characterized in that The top end and the bottom end of the sleeve body (3) are both provided with threaded holes (31), and the outside of the sleeve body (3) is provided with tool faces (32) outside the threaded holes (31); The tool face (32) is a hexagonal structure.

6. A self-locking sleeve for use in the connection of reinforcing bars for prefabricated components according to claim 1, characterized in that The core sleeve connector (4) comprises a threaded column (41), and the bottom of the threaded column (41) is provided with integral clamping pieces (44), and the number of the integral clamping pieces (44) is 4-6; The inner wall of the integral clamping piece (44) is provided with a plurality of clamping teeth (45) distributed at equal distances, and the clamping teeth (45) are downwardly inclined structures; The top of the threaded column (41) is fixedly provided with a limiting baffle (42); The middle part of the threaded column (41) and the limiting baffle (42) are both provided with through holes (43).

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