Prefabricated building prefabricated part steel bar welding connection structure
By using a welded connection structure with tapered enlarged heads and adjusting components at the ends of the reinforcing bars, the spatial limitations and quality control issues of reinforcing bar connections in prefabricated buildings are solved, achieving efficient and reliable connections and improving the safety and seismic performance of buildings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2026-04-07
AI Technical Summary
Existing methods for connecting steel bars in prefabricated components of prefabricated buildings are limited by on-site work space, resulting in poor connection quality, low efficiency, and high cost. Furthermore, traditional sleeve grouting connections suffer from problems such as grout leakage, jamming, and poor quality control.
The welded connection structure adopts a tapered enlarged head and an adjusting component. By setting a tapered enlarged head at the end of the reinforcing bar and using the adjusting component to eliminate the gap, a stable connection point is formed by welding, which can adapt to the connection requirements under different spatial conditions.
It improves the reliability and efficiency of steel bar connections, reduces costs, enhances the seismic performance and safety of buildings, avoids the risk of steel bar embrittlement caused by high temperatures, and improves connection quality.
Smart Images
Figure CN121802995A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of prefabricated buildings, and more particularly to a welded connection structure for prefabricated building components. Background Technology
[0002] Currently, there are two known application scenarios for steel bar connection technology in construction: The first application scenario: the steel bar connection methods in cast-in-place concrete construction process include: (1) steel bar lap splice connection; (2) steel bar lap welding connection; (3) steel bar butt electroslag pressure welding connection; (4) steel bar straight thread sleeve connection; (5) steel bar tapered thread sleeve connection, etc. The above connection methods are limited by the on-site working space conditions in the process of steel bar connection of prefabricated components in prefabricated buildings: 1. The anchorage length of steel bar lap splice connection is limited by the space on site. 2. The steel bar straight thread or tapered thread sleeve connection method is limited by the fact that the steel bar of the prefabricated component cannot rotate or is uncontrolled. 3. Steel bar lap welding is affected by the welding length and high temperature, which makes the steel bar brittle and reduces the performance indicators of the steel bar's resistance to bending and elongation. 4. There is no operating space for electroslag pressure welding.
[0003] The second application scenario involves the connection of reinforcing bars in prefabricated components of assembled buildings. Due to limitations in on-site working space and the uncontrolled nature of the connecting bars in prefabricated components, a widely used connection method is the semi-grouted or fully grouted anchoring connection of the reinforcing bar sleeve. This involves inserting one end of the connecting reinforcing bar into the sleeve, and then injecting high-strength cement mortar into the sleeve through grouting holes. The grout sets, forming an anchoring connection between the reinforcing bar and the sleeve. This type of connection suffers from problems such as grout leakage, jamming, and its quality is highly susceptible to environmental factors. Summary of the Invention
[0004] This invention provides a welded steel reinforcement connection structure for prefabricated building components, which features convenient construction, high efficiency, and high reliability. The specific technical solution is as follows: A prefabricated steel bar welding connection structure for prefabricated building components is characterized by: including two steel bars to be connected, with tapered enlarged heads respectively provided at the ends of the two steel bars, the tapered enlarged heads of the two steel bars being arranged opposite to each other and abutting each other, and the connection of the two steel bars is achieved by forming a welding point through welding the tapered surfaces of the enlarged heads.
[0005] An adjusting element is provided between the two conical enlarged heads. The two ends of the adjusting element are connected to the two conical enlarged heads respectively. The adjusting element can eliminate the gap between the two conical enlarged heads.
[0006] The adjusting component is a tightening bolt, which is threadedly connected to the tapered enlarged head.
[0007] The end face of the tightening bolt is tapered.
[0008] The tapered enlarged head is formed by extruding the ends of the reinforcing bars using an extrusion press.
[0009] The ends of the reinforcing bars are fitted with ferrules to form tapered enlarged heads.
[0010] The sleeve is truncated cone-shaped with a hole in the middle. The end of the reinforcing bar can be inserted into the hole and the sleeve can be pressed by an extrusion machine to form a tapered enlarged head.
[0011] The ends of the reinforcing bars are provided with external threads, and the sleeves are provided with threaded holes that mate with the external threads on the reinforcing bars. The reinforcing bars and sleeves are threaded together to form a tapered enlarged head.
[0012] When vertical or horizontal welding of reinforcing bars is limited by space, a beveled sleeve can be used. The beveled sleeve can be connected to the reinforcing bar by extrusion or screwing. The connection between the two reinforcing bars is achieved by welding the tapered surface of the beveled sleeve to form a welding point.
[0013] When the spacing between the inclined sleeves of two steel bars is too large, a U-shaped bracket can be fastened to the outside of the two inclined sleeves and welded to achieve the connection of the two steel bars.
[0014] The beneficial effects of this invention are: it changes the way steel bars are connected, and solves the problems of displacement, jamming, grout leakage, poor quality control, high cost and low efficiency in the existing prefabricated building steel bar sleeve grouting anchorage connection. It eliminates the sleeve grouting process, thereby reducing costs and improving efficiency, and increasing the tensile and compressive strength of steel bars, making the building's seismic performance better, safer and more reliable. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the reinforcing steel bars of the present invention; Figure 2 It is Figure 1 A schematic diagram of the extrusion processing of steel bar ends into thickened steel bar ends; Figure 3 It is Figure 2 A schematic diagram showing the process of machining the end face of the thickened rebar into a tapered enlarged head with a tapered surface; Figure 4 This is a schematic cross-sectional view of the straight hole sleeve of the present invention; Figure 5 It is Figure 1 steel bars and Figure 4 A schematic diagram of the cross-section of a straight-hole sleeve after extrusion; Figure 6 It is Figure 2 enlarged head of steel bar and Figure 4 A schematic diagram of the cross-section of a straight-hole sleeve after extrusion; Figure 7 This is a cross-sectional schematic diagram of the conical steel wedge of the present invention after being inserted into the gap between multiple steel bars; Figure 8This is a schematic diagram of the end face of the multi-strand steel bar of the present invention; Figure 9 It is Figure 7 Multiple steel bars and Figure 4 A schematic diagram of the cross-section of a straight-hole sleeve after extrusion; Figure 10 It is Figure 1 A cross-sectional view of the end of a reinforcing bar after threading; Figure 11 This is a schematic cross-sectional view of the threaded sleeve of the present invention; Figure 12 yes Figure 11 threaded sleeve and Figure 10 A cross-sectional view of the steel bars after being bolted together; Figure 13 It is Figure 1 A schematic diagram showing the process of machining the end of a steel bar into a tapered enlarged head; Figure 14 This is a schematic cross-sectional view of the through-hole sleeve of the present invention; Figure 15 It is Figure 13 steel bars and Figure 14 A schematic diagram of the cross-section of the through-hole sleeve after extrusion; Figure 16 It is Figure 13 A cross-sectional view of the end of a reinforcing bar after threading; Figure 17 This is a schematic cross-sectional view of the through-hole threaded sleeve of the present invention; Figure 18 yes Figure 16 steel bars and Figure 17 A cross-sectional view of the through-hole threaded sleeve after screwing. Figure 19 This is a schematic cross-sectional view of the tightening bolt of the present invention; Figure 20 It is Figure 10 steel bars and Figure 17 A cross-sectional view of the through-hole threaded sleeve after screwing. Figure 21 It is Figure 19 Tightening bolts are installed on Figure 20 A cross-sectional view from above; Figure 22 It is Figure 10 A cross-sectional diagram of the reinforcing bars after they have been screwed onto the inclined sleeve; Figure 23 yes Figure 3 A schematic cross-sectional view of the tapered enlarged head after axial butt welding; Figure 24 yes Figure 5 A schematic cross-sectional view of the composite enlarged head after axial butt welding; Figure 25yes Figure 6 A schematic cross-sectional view of the axially butt-welded composite enlarged head after narrowing; Figure 26 yes Figure 9 A cross-sectional schematic diagram of the multi-strand composite enlarged head after axial butt welding; Figure 27 yes Figure 12 A schematic cross-sectional view of the threaded sleeve composite enlarged head after axial butt welding; Figure 28 yes Figure 15 A schematic cross-sectional view of the through-hole sleeve extrusion composite enlarger head after axial butt welding; Figure 29 yes Figure 18 A schematic cross-sectional view of the through-hole threaded sleeve composite enlarger head after axial butt welding; Figure 30 yes Figure 21 A schematic cross-sectional view of the adjustable composite expansion head after axial butt welding. Figure 31 yes Figure 22 A schematic cross-sectional view of the inclined sleeve composite enlarged head after axial butt welding; Figure 32 yes Figure 31 A cross-sectional view of the inclined sleeve composite enlarged head and the U-shaped support plate after welding. Detailed Implementation
[0016] The prefabricated building component steel bar welding connection structure of the present invention includes two steel bars to be connected. The ends of the two steel bars are respectively provided with tapered enlarged heads. The tapered enlarged heads of the two steel bars are arranged opposite to each other and abut against each other. The connection of the two steel bars is achieved by welding on the tapered surface of the enlarged heads to form a welding point.
[0017] The following description, in conjunction with the accompanying drawings and embodiments, further illustrates the welded connection structure of prefabricated building components according to the present invention. Example 1
[0018] like Figure 1 As shown, the end 2 of the reinforcing bar 1 is formed into a thickened end 4 by extrusion using an extrusion press (as shown). Figure 2 As shown), the end face 3 of the thickened end 4 is then machined into a tapered enlarged head 6 with a tapered surface 5 (as shown). Figure 3 (As shown). The tapered enlarged heads 6 of the two reinforcing bars are positioned opposite each other and abut against each other. The tapered surfaces 5 of the oppositely positioned tapered enlarged heads 6 are fully welded around their perimeter to form a welding point 29, thus welding the two reinforcing bars together (as shown). Figure 23(As shown). This type of welding increases the welding surface and improves the strength after welding, thus offsetting the quality problem of easy breakage at the weld joint caused by the original diameter of the reinforcing bar and equal diameter welding. By butt welding the tapered enlarged head, the connection point of the reinforcing bar becomes a strong connection point, thereby achieving a strength at the weld point of the reinforcing bar that is greater than the strength of the reinforcing bar base material, improving the safety, seismic resistance and reliability of the building. Example 2
[0019] like Figure 1 and Figure 4 As shown, the end 2 of the reinforcing bar 1 is inserted into the straight hole 8 of the straight hole sleeve 7 with a tapered surface. The straight hole sleeve 7 is then pressed by an extruder to connect the straight hole sleeve 7 with the reinforcing bar 1, forming a composite enlarged head 9 (as shown). Figure 5 (As shown). The composite enlarged heads 9 of the two reinforcing bars are positioned opposite each other and abut against each other. The tapered surfaces of the opposing composite enlarged heads 9 are then fully welded around their perimeter to form a welding point 29, thus welding the two reinforcing bars together (as shown). Figure 24 (As shown). By adding straight-hole sleeves to the ends of the reinforcing bars and directly welding them, the reliability of the reinforcing bar connection is further improved. This avoids the risk of the reinforcing bars becoming brittle and breaking due to the high temperatures generated by direct welding. Example 3
[0020] like Figure 2 and Figure 4 As shown, the thickened end 4 of the reinforcing bar 1 is inserted into the straight hole 8 of the straight hole sleeve 7 with a tapered surface. The straight hole sleeve 7 is then pressed by a pressing machine, causing the straight hole 8 to shrink and lock the thickened end 4 of the reinforcing bar 1, forming a constricted composite enlarged head 10 (as shown). Figure 6 (As shown). The constricted composite enlarged heads 10 of the two reinforcing bars are positioned opposite each other and abut against each other. The tapered surfaces of the oppositely positioned constricted composite enlarged heads 10 are fully welded around their perimeter to form welding points 29, thus welding the two reinforcing bars together (as shown). Figure 25 (As shown). By adding straight-hole sleeves to the ends of the reinforcing bars and directly welding them, the reliability of the reinforcing bar connection is further improved. This avoids the risk of the reinforcing bars becoming brittle and breaking due to the high temperatures generated by direct welding. Example 4
[0021] like Figure 7 and Figure 8 As shown, when using multiple strands of steel bars 11 as tension bars in large-scale construction projects, one or more conical steel wedges 13 are inserted into the gaps 12 at the ends of the multiple strands of steel bars 11, so that the ends of the multiple strands of steel bars 11 are enlarged by the conical steel wedges 13, forming multiple conical enlarged heads 14.
[0022] like Figure 7 and Figure 4As shown, the multi-strand tapered enlarged head 14 of the multi-strand steel bar 11 is inserted into the straight hole 8 of the straight hole sleeve 7 with a tapered surface. The straight hole sleeve 7 is then compressed by an extruder, causing the straight hole 8 to shrink and lock the multi-strand tapered enlarged head 14, forming a multi-strand composite enlarged head 15 (as shown). Figure 9 (As shown). The multi-strand composite enlarged heads 15 of the two reinforcing bars are positioned opposite each other and abut against each other. The tapered surfaces of the opposing multi-strand composite enlarged heads 15 are then fully welded around their perimeter to form welding points 29, thus welding the two reinforcing bars together (as shown). Figure 26 (As shown). By adding straight-hole sleeves to the ends of multi-strand reinforcing bars and directly welding these sleeves, the reliability of the reinforcing bar connection is further improved. This avoids the risk of the reinforcing bars becoming brittle and breaking due to the high temperatures generated by direct welding. Example 5
[0023] like Figure 1 , Figure 10 and Figure 11 As shown, the end 2 of the reinforcing bar 1 is processed into a threaded end 17 with threads 16. The threaded end 17 is screwed into the threaded hole 19 of the threaded sleeve 18 to form a threaded sleeve composite enlarged head 20 (as shown). Figure 12 (As shown). The threaded sleeves of the two reinforcing bars are arranged opposite each other and abut against each other. The tapered surfaces of the oppositely arranged threaded sleeves are fully welded to form welding points 29, thus welding the two reinforcing bars together (as shown). Figure 27 (As shown). Adding threaded sleeves to the ends of the reinforcing bars and directly welding these sleeves further improves the reliability of the reinforcing bar connection. This avoids the risk of the reinforcing bars becoming brittle and breaking due to the high temperatures generated by direct welding. Example 6
[0024] like Figure 1 , Figure 13 As shown in Figure 14, the end 2 of the reinforcing bar 1 is processed into a tapered end 31, and the tapered end 31 of the reinforcing bar 1 is inserted into the through-hole sleeve 21 with a tapered surface. The through-hole sleeve 21 is then pressed by an extrusion press to connect the through-hole sleeve 21 with the reinforcing bar 1, forming a through-hole sleeve extrusion composite enlarged head 22 (as shown in Figure 14). Figure 15 (As shown). The through-hole sleeve extrusion composite enlarged heads 22 of the two reinforcing bars are arranged opposite each other and abut against each other. The tapered surfaces of the oppositely arranged through-hole sleeve extrusion composite enlarged heads 22 are fully welded around the perimeter to form a welding point 29, so that the two reinforcing bars are welded together (as shown). Figure 28 (As shown). By adding through-hole sleeves to the ends of the reinforcing bars and directly welding these sleeves, the reliability of the reinforcing bar connection is further improved. This avoids the risk of the reinforcing bars becoming brittle and breaking due to the high temperatures generated by direct welding. Example 7
[0025] like Figure 13 , Figure 16 As shown in Figure 17, the tapered end 31 of the reinforcing bar 1 is machined into a threaded tapered end 32, and the threaded tapered end 32 is screwed into the through-hole threaded sleeve 23 to form a through-hole threaded sleeve composite enlarged head 24 (as shown in Figure 17). Figure 18 (As shown). The threaded sleeves of the two reinforcing bars are arranged opposite each other and abut against each other. The tapered surfaces of the oppositely arranged threaded sleeves of the threaded sleeves are fully welded around to form a welding point 29, so that the two reinforcing bars are welded together (as shown). Figure 29 (As shown). By adding through-hole threaded sleeves to the ends of the reinforcing bars and directly welding these sleeves, the reliability of the reinforcing bar connection is further improved. This avoids the risk of the reinforcing bars becoming brittle and breaking due to the high temperatures generated by direct welding. Example 8
[0026] like Figure 10 , Figure 17 As shown in Figure 19, the threaded end 17 of the reinforcing bar 1 is screwed onto the lower part of the through-hole threaded sleeve 23, and then a tightening bolt 25 with a tapered surface is screwed onto the upper end of the through-hole threaded sleeve 23 to form an adjustable composite enlarged head 26 (as shown in Figure 19). Figure 21 (As shown). Adjustable composite enlarged heads 26 of two reinforcing bars are positioned opposite each other and abut against each other. The tapered surfaces of the opposing adjustable composite enlarged heads 26 are fully welded around their perimeter to form welding points 29, thus welding the two reinforcing bars together (as shown). Figure 30 (As shown).
[0027] The tightening bolt 25 can be installed on the threaded sleeve 23 of one of the reinforcing bars, or one tightening bolt 25 can be installed on the threaded sleeve 23 of both reinforcing bars. When the enlarged ends of two reinforcing bars are axially joined, sometimes the gap is too large. The tightening bolt 25 can be used to reduce the gap between the enlarged ends to facilitate welding. Example 9
[0028] When welding operations for vertical or horizontal connections of reinforcing bars are limited by space, for example, when the vertical reinforcing bars are too densely spaced to be welded on all four sides, or when the horizontal reinforcing bars are too densely distributed or there is no welding space at the bottom of the reinforcing bars to be welded, a beveled sleeve 27 can be used. This beveled sleeve 27 can be combined with the tapered enlarged head 6, the threaded end 17, the tapered end 31, or the threaded tapered end 32 of the reinforcing bar to form a beveled sleeve composite enlarged head 28. The beveled sleeve 27 is divided into: straight hole beveled sleeve, threaded beveled sleeve, through hole beveled sleeve, and through hole threaded beveled sleeve.
[0029] Insert the tapered enlarged head 6 of the reinforcing bar 1 into the straight hole of the straight-hole inclined sleeve 27, and press the straight-hole inclined sleeve 27 with a pressing machine to connect the straight-hole inclined sleeve 27 with the reinforcing bar 1, forming an inclined sleeve composite enlarged head 28 (not shown in the figure). Insert the tapered end 31 of the reinforcing bar 1 into the straight hole of the straight-hole inclined sleeve 27, and press the straight-hole inclined sleeve 27 with a pressing machine to connect the straight-hole inclined sleeve 27 with the reinforcing bar 1, forming an inclined sleeve composite enlarged head 28 (not shown in the figure). Screw the threaded end 17 of the reinforcing bar into the threaded hole of the threaded inclined sleeve 27 to form an inclined sleeve composite enlarged head 28 (as shown in the figure). Figure 22 (As shown). The threaded tapered end 32 of the reinforcing bar 1 is screwed into the threaded hole of the threaded beveled sleeve 27 to form the beveled sleeve composite enlarged head 28 (not shown in the figure).
[0030] like Figure 22 As shown, the inclined sleeves of the two reinforcing bars are positioned opposite each other and abut against each other. The tapered surfaces of the two inclined sleeves of the two enlarged heads 28 are welded together to form a welding point 29, thus welding the two reinforcing bars together (as shown). Figure 31 (As shown). When the welding spacing between the two beveled sleeve composite enlarged heads 28 is too large, the U-shaped support 30 can be fastened to the outside of the two beveled sleeve composite enlarged heads 28 and welded together to achieve the connection of the two reinforcing bars (as shown). Figure 32 (As shown). The inner diameter of the U-shaped support 30 matches the outer diameter of the inclined sleeve composite enlarger head 28, which facilitates welding.
[0031] When using a through-hole beveled sleeve, the end 2 of the reinforcing bar 1 can be machined into a beveled end that matches the beveled sleeve. The beveled end of the reinforcing bar 1 is then inserted into the through hole of the through-hole beveled sleeve, and the through-hole beveled sleeve is pressed onto the reinforcing bar 1 using an extrusion machine. When using a through-hole threaded beveled sleeve, the beveled end of the reinforcing bar needs to be machined with threads and screwed onto the through-hole beveled sleeve.
[0032] Since the conical enlarger head 6, composite enlarger head 9, narrowed composite enlarger head 10, multi-strand composite enlarger head 15, threaded sleeve composite enlarger head 20, through-hole sleeve extrusion composite enlarger head 22, through-hole threaded sleeve composite enlarger head 24, and adjustable composite enlarger head 26 of the present invention all have a conical bottom surface, the conical enlarger head 6, composite enlarger head 9, narrowed composite enlarger head 10, multi-strand composite enlarger head 15, threaded sleeve composite enlarger head 20, through-hole sleeve extrusion composite enlarger head 22, through-hole threaded sleeve composite enlarger head 24, and adjustable composite enlarger head 26 can be arbitrarily combined and the connection between two steel bars can be achieved by welding. This changes the traditional steel bar connection method of using sleeve grouting anchoring connection for precast components of precast concrete structures, solves problems such as steel bar displacement, jamming, grout leakage, and poor quality controllability, and improves the quality of steel bar connection.
[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A welded steel reinforcement connection structure for prefabricated components in assembled buildings, characterized in that: It includes two steel bars to be connected. Each end of the two steel bars is provided with a tapered enlarged head. The tapered enlarged heads of the two steel bars are arranged opposite each other and abut against each other. The connection of the two steel bars is achieved by welding the tapered surfaces of the enlarged heads to form a welding point.
2. The prefabricated steel reinforcement welded connection structure for prefabricated building components according to claim 1, characterized in that: An adjusting element is provided between the two conical enlarged heads. The two ends of the adjusting element are connected to the two conical enlarged heads respectively. The adjusting element can eliminate the gap between the two conical enlarged heads.
3. The precast steel reinforcement welded connection structure for assembled buildings according to claim 2, characterized in that: The adjusting component is a tightening bolt, which is threadedly connected to the tapered enlarged head.
4. The precast steel reinforcement welded connection structure for assembled buildings according to claim 3, characterized in that: The end face of the tightening bolt is tapered.
5. The precast steel reinforcement welded connection structure for assembled buildings according to claim 1, characterized in that: The tapered enlarged head is formed by extruding the ends of the reinforcing bars using an extrusion press.
6. The prefabricated steel reinforcement welded connection structure for prefabricated building components according to claim 1, characterized in that: The ends of the reinforcing bars are fitted with ferrules to form tapered enlarged heads.
7. The precast steel reinforcement welded connection structure for assembled buildings according to claim 6, characterized in that: The sleeve is truncated cone-shaped with a hole in the middle. The end of the reinforcing bar can be inserted into the hole and the sleeve can be pressed by an extrusion machine to form a tapered enlarged head.
8. The precast steel reinforcement welded connection structure for assembled buildings according to claim 6, characterized in that: The ends of the reinforcing bars are provided with external threads, and the sleeves are provided with threaded holes that mate with the external threads on the reinforcing bars. The reinforcing bars and sleeves are threaded together to form a tapered enlarged head.
9. The precast steel reinforcement welded connection structure for assembled buildings according to claim 6, characterized in that: When vertical or horizontal welding of reinforcing bars is limited by space, a beveled sleeve can be used. The beveled sleeve can be fixed to the end of the reinforcing bar by compression or screwing. The connection between the two reinforcing bars is achieved by welding the tapered surface of the beveled sleeve to form a welding point.
10. The prefabricated steel reinforcement welded connection structure for prefabricated building components according to claim 9, characterized in that: When the spacing between the inclined sleeves of two steel bars is too large, a U-shaped bracket can be fastened to the outside of the two inclined sleeves and welded to achieve the connection of the two steel bars.