Connector suitable for steel bar butt joint of assembly type reinforced concrete member

Abstract

The invention discloses a connector suitable for steel bar butt joint of an assembly type reinforced concrete member, and relates to the field of steel bar butt joint of assembly type concrete construction. The stepped sleeve internally provided with the upper open threaded blind cavity and the lower open threaded blind cavity which are coaxially arranged is designed, and the stepped sleeve is matched with the upper reinforcing steel bar nut and the sleeve limiting ring, so that integrated smooth butt joint of adjacent reinforced concrete members in a fabricated building is achieved; and on the basis that the butt joint radial deviation of the butt joint steel bars is easy to realize in the actual construction process, the butt joint centering of the steel bars can be ensured, the butt joint reliability and durability of the steel bars are greatly improved, the construction quality and anti-seismic property of the fabricated concrete building are improved, and the construction efficiency is greatly improved. Meanwhile, reliable and efficient butt joint of a plurality of steel bars on the sections of adjacent concrete members can be smoothly achieved through matched use of multiple sets of steel bars, and the beneficial effects of being high in efficiency, high in reliability and stability, good in durability, excellent in shock resistance, easy to operate and capable of saving cost are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel bar butt joint in prefabricated concrete buildings, and more specifically to a connector suitable for steel bar butt joint of prefabricated reinforced concrete components. Background Art

[0002] With the comprehensive development of the construction industry at home and abroad, the original on-site construction method can no longer meet the needs of modern construction. This is because the original on-site construction method requires tying steel bars on the construction site first and then pouring concrete. These operations are often limited by the construction site environment, space, and efficiency, and encounter development bottlenecks. Therefore, they can no longer meet the needs of modern construction. Against this background, prefabricated concrete buildings came into being and showed a trend of gradual development. Prefabricated concrete buildings are a construction method that first mass-produces reinforced concrete prefabricated components in the factory and then assembles them into prefabricated components on the construction site. The construction method of prefabricated concrete buildings can not only greatly improve the construction efficiency, but also solve the shortcomings of the on-site environment and space limitations. At the same time, it also improves the construction quality of each building component and improves the overall stability of the building.

[0003] Among them, the key and difficult technical issues that need to be solved in the on-site construction of prefabricated concrete buildings are the steel bar butt joint technology between the various prefabricated concrete components. At present, the existing steel bar butt joint technologies in prefabricated concrete buildings mainly include grouting sleeve connection, grout anchor lap connection, hydraulic sleeve, and welding connection. These four connection technologies have more or less shortcomings in terms of the seismic performance of buildings, the reliability and durability of steel bar connections, and energy saving and high efficiency, which in turn affects the development and promotion of prefabricated concrete buildings. The following is a detailed introduction to the advantages and disadvantages of these four existing connection technologies: 1. Grouting sleeve connection technology: The steel sleeve grouting connection technology refers to the insertion of ribbed steel bars into a grouting sleeve with a concave and convex surface in the inner cavity. A special high-strength cement-based grouting material is poured into the gap between the sleeve and the steel bar. After the grouting material solidifies, the steel bar is anchored in the sleeve to achieve a steel bar connection technology for prefabricated components. The seismic performance of buildings assembled using the grouting sleeve connection technology is average, the reliability and durability of the steel bar connection is average, and the construction efficiency is average.

[0004] 2. Grout-anchor lap connection technology: Grout-anchor lap connection technology refers to the steel bar lap connection method achieved by inserting the steel bars to be overlapped into the holes made by special technology in precast concrete components and pouring cement-based grouting materials. Buildings assembled with grout-anchor lap connection technology have poor seismic performance, poor reliability and durability of steel bar connections, and low construction efficiency.

[0005] 3. Hydraulic sleeve connection technology: The hydraulic sleeve connection technology is to insert two steel bars to be connected into the steel bar connection sleeve, and use a side pressure connection machine to radially extrude the connection sleeve, so that the sleeve produces cold plastic deformation and tightens the steel bar, thereby generating shear force to transfer stress loads. Buildings assembled with hydraulic sleeve connection technology have poor seismic performance, poor reliability and durability of steel bar connections, and low construction efficiency.

[0006] 4. Welding connection technology: Welding connection technology refers to the connection method of embedding steel plates in precast concrete components and welding the embedded steel plates between components to transfer the forces between components. Welding connection is generally only used for the connection of non-structural components in concrete structures. Buildings assembled using welding connection technology have poor seismic performance, poor reliability and durability of steel bar connections, and poor construction efficiency. Summary of the invention

[0007] The purpose of the present invention is to provide a connector suitable for butt jointing of steel bars in prefabricated reinforced concrete components in response to the shortcomings of the above-mentioned prior art. The present invention can realize the integrated and smooth butt jointing of adjacent reinforced concrete components in prefabricated buildings, and can ensure the concentricity of butt jointing of steel bars on the basis of the butt jointing radial deviation that is easy to achieve in the actual construction process. This can not only greatly improve the reliability and durability of butt jointing of steel bars, improve the construction quality and seismic performance of prefabricated concrete buildings, but also greatly improve the construction efficiency. At the same time, through the coordinated use of multiple sets of the present invention, it can also realize the smooth, reliable and efficient butt jointing of multiple steel bars in adjacent concrete component sections, which has the advantages of high butt jointing efficiency, reliable and stable butt jointing, good durability, excellent seismic resistance, simple operation and cost saving.

[0008] The purpose of the present invention can be achieved by the following technical measures: The connector of the present invention is suitable for butt-jointing steel bars of assembled reinforced concrete components, and comprises a stepped sleeve with a stepped columnar shape and an upper open threaded blind cavity and a lower open threaded blind cavity arranged coaxially therein (the stepped sleeve is used to quickly and smoothly butt-joint the lower steel bar and the upper steel bar, and has the advantages of high butt-jointing efficiency, reliable and stable butt-jointing, good durability, excellent seismic resistance, simple operation and cost saving - that is, the butt-joint end of the lower steel bar and the lower open threaded blind cavity are quickly connected by thread combination; the sleeve limiting ring and the upper open threaded blind cavity are quickly connected by thread combination, and a cavity for sealing the upper steel bar nut is formed, and The upper steel bar nut is quickly connected to the upper steel bar by means of threaded connection. At the same time, since there is a certain diameter gap between the sleeve limit ring and the upper steel bar, and between the upper steel bar nut and the upper open threaded blind cavity - the preferred value of the diameter gap is not less than 6mm, this is the range of radial deviation that can be achieved during the actual construction process. In other words, the concentricity of the steel bar connection can be ensured on the basis of the radial deviation that can be easily achieved during the actual construction process. This can not only greatly improve the reliability and durability of the steel bar connection, improve the construction quality and seismic performance of prefabricated concrete buildings, but also greatly improve the construction efficiency. In addition, through multiple The combined use of the sleeve of the present invention can also achieve smooth, reliable and efficient docking of multiple steel bars in adjacent concrete component sections), an upper steel bar nut which is embedded in the upper open threaded blind cavity in a clearance fit manner and combined with the upper steel bar by a threaded manner (used to fix the upper steel bar and ensure the centering of the upper and lower steel bars for steel bar docking on the basis of allowing the docking steel bars to have a radial deviation that is easy to achieve in the actual construction process, greatly improving the reliability and durability of steel bar docking, improving the construction quality and seismic resistance of prefabricated concrete buildings, and improving construction efficiency), is screwed and sealed at the open end of the upper open threaded blind cavity, and A sleeve limit ring that cooperates with the upper steel bar gap (used to limit the axial position of the upper steel bar nut, and thus limit the axial position of the upper steel bar); two symmetrical operating holes that penetrate the cylinder wall along the diameter direction are opened in the middle of the upper open threaded blind cavity (providing operating space for screwing the upper steel bar nut), and a plurality of groups of plug-in and rotating holes that penetrate the nut wall thickness along the diameter direction are opened in the middle of the upper steel bar nut (used to insert the turning tool to facilitate the screwing of the upper steel bar nut), and the outer surface of the bottom end of the small diameter step section of the stepped sleeve is processed into a regular hexagon (to facilitate the wrench to clamp the stepped sleeve, and smoothly realize the threaded connection between the butt end of the lower steel bar and the lower open threaded blind cavity).

[0009] In the present invention, the inner surfaces of the upper open threaded blind cavity and the lower open threaded blind cavity are both processed with internal threads; the ends to be connected of the upper steel bar and the lower steel bar are both processed with external threads; the outer ring surface of the sleeve limiting ring is processed with external threads matching the internal threads of the upper open threaded blind cavity (ensuring that the sleeve limiting ring and the upper open threaded blind cavity are smoothly threadedly connected); the inner surface of the upper steel bar nut is processed with internal threads matching the external threads of the end to be connected of the upper steel bar (ensuring that the upper steel bar and the upper steel bar nut are smoothly threadedly connected); the internal threads of the lower open threaded blind cavity match the external threads of the end to be connected of the lower steel bar (ensuring that the lower steel bar and the lower open threaded blind cavity are smoothly threadedly connected).

[0010] The angle of the operating hole in the present invention is 60 to 90 degrees (ensuring both a sufficiently large operating space and radial limitation of the steel bar nut); the number of the plug-in and rotating holes is four groups, each group is two symmetrical holes, and the central angle of two adjacent plug-in and rotating holes is 45 degrees (ensuring that at least one plug-in and rotating hole is located in the operating hole area).

[0011] The diameter gap between the sleeve limiting ring and the upper steel bar in the present invention is not less than 6mm; the diameter gap between the upper steel bar nut and the upper open threaded blind cavity is not less than 6mm (the preferred value of the diameter gap is not less than 6mm, because the butt joint radial deviation range of not less than 6mm can be achieved and guaranteed in the actual construction process. In other words, the concentricity of the steel bar butt joint can be ensured on the basis of the butt joint radial deviation that is easy to achieve in the actual construction process. This can not only greatly improve the reliability and durability of the steel bar butt joint, improve the construction quality and seismic performance of prefabricated concrete buildings, but also greatly improve the construction efficiency).

[0012] The design principle of the present invention is as follows: The present invention is designed with a stepped sleeve with a stepped columnar appearance and an upper open threaded blind cavity and a lower open threaded blind cavity arranged coaxially therein. By means of the stepped sleeve, the upper steel bar nut and the sleeve limiting ring cooperate with each other, the integrated and smooth docking of adjacent reinforced concrete components in the prefabricated building can be realized, and the centrality of the steel bar docking can be ensured on the basis of the easy-to-achieve docking radial deviation of the docking steel bars during the actual construction process. This can not only greatly improve the reliability and durability of the steel bar docking, improve the construction quality and seismic performance of the prefabricated concrete building, but also greatly improve the construction efficiency. At the same time, through the coordinated use of multiple sets of the present invention, multiple steel bars of adjacent concrete component sections can be smoothly docked, reliably docked and efficiently docked, which has the advantages of high docking efficiency, reliable and stable docking, good durability, excellent seismic resistance, simple operation and cost saving.

[0013] More specifically, the butt end of the lower steel bar is connected to the lower open threaded blind cavity by threaded combination to achieve quick connection, the sleeve limit ring is connected to the upper open threaded blind cavity by threaded combination to achieve quick connection and form a cavity for blocking the upper steel bar nut, and the upper steel bar nut is connected to the upper steel bar by threaded combination to achieve quick connection, so that the steel bar butt joint of adjacent reinforced concrete components in the prefabricated building can be stably and efficiently completed. At the same time, since there is a certain diameter gap between the sleeve limit ring and the upper steel bar, and between the upper steel bar nut and the upper open threaded blind cavity-the preferred value of the diameter gap is not less than 6mm, which is the range of radial deviation of butt joint that can be achieved in the actual construction process. In other words, the centering of the steel bar butt joint can be ensured on the basis of the radial deviation of butt joint that can be easily achieved in the actual construction process, which can not only greatly improve the reliability and durability of the steel bar butt joint, improve the construction quality and seismic performance of the prefabricated concrete building, but also greatly improve the construction efficiency. In addition, through the coordinated use of multiple sets of the present invention, multiple steel bars of adjacent concrete component sections can be smoothly butt jointed, reliably butt jointed and efficiently butt jointed, and finally the adjacent reinforced concrete components can be integrated and smoothly connected by auxiliary formwork grouting. The present invention is applicable to the butt joint of reinforced concrete components that are arranged adjacent to each other vertically or adjacent to each other horizontally, and has the advantages of wide application range and flexible operation.

[0014] The beneficial technical effects of the present invention are as follows: The present invention can realize the integrated and smooth docking of adjacent reinforced concrete components in prefabricated buildings, and can ensure the centrality of the steel bar docking on the basis of the easily achievable docking radial deviation of the docking steel bars during the actual construction process. This can not only greatly improve the reliability and durability of the steel bar docking, improve the construction quality and seismic performance of prefabricated concrete buildings, but also greatly improve the construction efficiency. At the same time, through the coordinated use of multiple sets of the present invention, multiple steel bars in adjacent concrete component sections can be smoothly docked, reliably docked and efficiently docked, which has the advantages of high docking efficiency, reliable and stable docking, good durability, excellent seismic resistance, simple operation and cost saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention (also a usage state diagram).

[0016] Figure 2 yes Figure 1 AA section view in.

[0017] Figure 3 It is a structural schematic diagram of the stepped sleeve in the present invention.

[0018] Figure 4 yes Figure 3 BB cross-section diagram in.

[0019] Figure 5 yes Figure 3 CC cross-section diagram in .

[0020] Figure 6 yes Figure 3 DD cross-section diagram in.

[0021] Figure 7 yes Figure 3 EE cross-section diagram in.

[0022] Figure 8 yes Figure 3 FF cross-section diagram in.

[0023] Fig. 9 It is a structural schematic diagram of the upper steel bar nut in the present invention.

[0024] Fig.10 yes Fig. 9 GG cross-section diagram in.

[0025] Fig.11 yes Fig. 9 HH cross-section diagram in .

[0026] Fig.12 It is a structural schematic diagram of the sleeve limiting ring in the present invention.

[0027] Fig.13 It is a schematic diagram of the steel bar structure to be connected.

[0028] Explanation of the part numbers in the figure: 1. Step sleeve, 1-1. Upper open threaded blind cavity, 1-2. Lower open threaded blind cavity, 1-3. Operating hole, 1-4. Hexagonal shape segment, 2. Lower steel bar, 3. Upper steel bar nut, 3-1. Plug-in and pull-out rotation hole, 4. Sleeve limit ring; 5. Upper steel bar. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings: like Figures 1 to 13As shown, a connector suitable for butt joint of steel bars of assembled reinforced concrete components of the present invention comprises a stepped sleeve 1 having a stepped columnar shape and an upper open threaded blind cavity 1-1 and a lower open threaded blind cavity 1-2 arranged coaxially therein (the stepped sleeve 1 is used to quickly realize the integrated and smooth butt joint of the lower steel bar 2 and the upper steel bar 5, and has the advantages of high butt joint efficiency, reliable and stable butt joint, good durability, excellent seismic resistance, simple operation and cost saving - that is, the butt joint end of the lower steel bar 2 is quickly connected with the lower open threaded blind cavity 1-2 by threaded combination; the sleeve limiting ring 4 is quickly connected with the upper open threaded blind cavity 1-1 by threaded combination, and forms a nut for sealing the upper steel bar 3, and the upper steel bar nut 3 is quickly connected with the upper steel bar 5 by threaded connection. At the same time, since there is a certain diameter gap between the sleeve limit ring 4 and the upper steel bar 5, and between the upper steel bar nut 3 and the upper open threaded blind cavity 1-1 - the preferred value of the diameter gap is not less than 6mm, this is the range of radial deviation that can be achieved in the actual construction process. In other words, the centering of the steel bar connection can be ensured on the basis of the radial deviation that can be easily achieved in the actual construction process. This can not only greatly improve the reliability and durability of the steel bar connection, improve the construction quality and seismic performance of prefabricated concrete buildings, but also greatly improve the construction efficiency. In addition, through multiple sets of this The invention can also achieve smooth, reliable and efficient docking of multiple steel bars in adjacent concrete component sections by using a combination of the invention. The upper steel bar nut 3 is embedded in the upper open threaded blind cavity 1-1 in a clearance fit manner and combined with the upper steel bar 5 by a threaded manner (used to fix the upper steel bar 5 and ensure the centering of the upper steel bar 5 and the lower steel bar 2 for steel bar docking on the basis of allowing the docking steel bars to have a radial deviation that is easy to achieve in the actual construction process, greatly improving the reliability and durability of the steel bar docking, improving the construction quality and seismic resistance of the prefabricated concrete building, and improving the construction efficiency). It is screwed and sealed at the open end of the upper open threaded blind cavity 1-1 and has a gap with the upper steel bar 5. A matching sleeve limit ring 4 (used to limit the axial position of the upper steel bar nut 3, and thus limit the axial position of the upper steel bar 5); two symmetrical operating holes 1-3 are opened in the middle of the upper open threaded blind cavity 1-1, which penetrate the cylinder wall along the diameter direction (providing operating space for screwing the upper steel bar nut 3); a plurality of groups of plug-in and rotating holes 3-1 are opened in the middle of the upper steel bar nut 3, which penetrate the nut wall thickness along the diameter direction (used to insert the turning tool to facilitate the screwing of the upper steel bar nut 3); the outer surface of the bottom end of the small-diameter step section of the stepped sleeve 1 is processed into a regular hexagon (to facilitate the wrench to clamp the stepped sleeve 1, and smoothly realize the threaded connection between the butt end of the lower steel bar 2 and the lower open threaded blind cavity 1-2).

[0030] In the present invention, the inner surfaces of the upper open threaded blind cavity 1-1 and the lower open threaded blind cavity 1-2 are both processed with internal threads; the ends to be connected of the upper steel bar 5 and the lower steel bar 2 are both processed with external threads; the outer ring surface of the sleeve limiting ring 4 is processed with external threads matching the internal threads of the upper open threaded blind cavity 1-1 (ensuring that the sleeve limiting ring 4 and the upper open threaded blind cavity 1-1 are smoothly threadedly combined); the inner surface of the upper steel bar nut 3 is processed with internal threads matching the external threads of the end to be connected of the upper steel bar 5 (ensuring that the upper steel bar 5 and the upper steel bar nut 3 are smoothly threadedly combined); the internal threads of the lower open threaded blind cavity 1-2 match the external threads of the end to be connected of the lower steel bar 2 (ensuring that the lower steel bar 2 and the lower open threaded blind cavity 1-2 are smoothly threadedly combined).

[0031] The angle of the operating hole 1-3 in the present invention is 60 to 90 degrees (ensuring that there is a sufficiently large operating space and that the radial limit of the upper steel bar nut 3 is ensured); the number of the plug-in and rotating holes 3-1 is four groups, each group is two symmetrical, and the central angle of two adjacent plug-in and rotating holes 3-1 is 45 degrees (ensuring that at least one plug-in and rotating hole 3-1 is located in the operating hole 1-3 area).

[0032] The diameter gap between the sleeve limit ring 4 and the upper steel bar 5 in the present invention is not less than 6mm; the diameter gap between the upper steel bar nut 3 and the upper open threaded blind cavity 1-1 is not less than 6mm (the preferred value of the diameter gap is not less than 6mm, because the docking radial deviation range of not less than 6mm can be achieved and guaranteed in the actual construction process. In other words, the centering of the steel bar docking can be ensured on the basis of the docking radial deviation that is easy to achieve in the actual construction process. This can not only greatly improve the reliability and durability of the steel bar docking, improve the construction quality and seismic performance of prefabricated concrete buildings, but also greatly improve the construction efficiency).

[0033] The specific use of the present invention is as follows: First, all the threaded butt ends of the lower steel bars 2 in the lower reinforced concrete member are screwed into the lower open threaded blind cavities 1-2 of the corresponding stepped sleeves 1, and the hexagonal outer section 1-4 is gradually rotated to make the lower steel bars 2 and the matching threaded sections of the lower open threaded blind cavities 1-2 tightly combined, so as to complete the butt connection between the stepped sleeve 1 and the lower steel bars 2; then, the upper steel bar nuts 3 matching the number of all the upper steel bars 5 in the upper reinforced concrete member are put into the upper open threaded blind cavities 1-1 of the corresponding stepped sleeves 1 in advance, Then screw the sleeve limit ring 4 into the upper open threaded blind cavity 1-1 of the corresponding stepped sleeve 1 until the end faces of the two are flush; then, let all the upper steel bars 5 in the upper reinforced concrete member pass through the corresponding sleeve limit ring 4 and insert them into the corresponding upper steel bar nuts 3, and then use the installation tool inserted into the plug-in and rotating hole 3-1 to rotate the upper steel bar nuts 3, so that the upper steel bar nuts 3 move upward along the upper steel bars 5 until the lower bottom surface of the sleeve limit ring 4 is completely compressed, and the lifting and docking of the stepped sleeve 1 and the upper steel bars 5 are completed. In this way, the steel bar docking of the upper reinforced concrete member and the lower reinforced concrete member is completed stably and efficiently. Finally, the supporting formwork uses cement-based grouting material to fill the entire periphery and interior of the stepped sleeve 1 densely, and after the strength of the grouting material reaches the design requirements, the formwork is removed. In this way, the entire connection process of the upper reinforced concrete member and the lower reinforced concrete member is completed.

[0034] Similarly, in addition to realizing the connection between the upper reinforced concrete component and the lower reinforced concrete component mentioned above, the present invention is also applicable to the connection of reinforced concrete components placed on the left and right. The use process is similar and will not be described in detail.

Claims

1. A connector suitable for butt joint of steel bars in assembled reinforced concrete components, characterized in that: The connector comprises a stepped sleeve (1) having a stepped columnar shape and having an upper open threaded blind cavity (1-1) and a lower open threaded blind cavity (1-2) arranged coaxially therein; an upper steel bar nut (3) which is inserted into the upper open threaded blind cavity (1-1) in a clearance fit manner and is connected to an upper steel bar (5) by means of a thread; and a sleeve stop ring (4) which is screwed and sealed at an open end of the upper open threaded blind cavity (1-1) and is clearance fit with the upper steel bar (5); two symmetrical operating holes (1-3) which penetrate the cylinder wall in a diameter direction are provided in the middle of the upper open threaded blind cavity (1-1); a plurality of groups of plug-in and pull-out rotating holes (3-1) which penetrate the nut wall thickness in a diameter direction are provided in the middle of the upper steel bar nut (3); and the outer surface of the bottom end of the small diameter step section of the stepped sleeve (1) is processed into a regular hexagon.

2. A connector suitable for butt jointing of steel bars in assembled reinforced concrete components according to claim 1, characterized in that: Internal threads are processed on the inner surfaces of the upper open threaded blind cavity (1-1) and the lower open threaded blind cavity (1-2); external threads are processed on the ends to be butted of the upper steel bar (5) and the lower steel bar (2); external threads matching the internal threads of the upper open threaded blind cavity (1-1) are processed on the outer ring surface of the sleeve limiting ring (4); internal threads matching the external threads of the end to be butted of the upper steel bar (5) are processed on the inner surface of the upper steel bar nut (3); and the internal threads of the lower open threaded blind cavity (1-2) match the external threads of the end to be butted of the lower steel bar (2).

3. A connector suitable for butt jointing of steel bars in assembled reinforced concrete components according to claim 1, characterized in that: The angle of the operating hole (1-3) is 60 to 90 degrees; the number of the plug-in rotation holes (3-1) is four groups, each group is two symmetrical ones, and the central angle of two adjacent plug-in rotation holes (3-1) is 45 degrees.

4. A connector suitable for butt jointing of steel bars in assembled reinforced concrete components according to claim 1, characterized in that: The diameter gap between the sleeve limiting ring (4) and the upper steel bar (5) is not less than 6 mm; the diameter gap between the upper steel bar nut (3) and the upper open threaded blind cavity (1-1) is not less than 6 mm.

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