A steel bar connection structure with anchor plate

Abstract

The present invention provides a steel bar connection structure with an anchor plate, which includes a first concrete unit, a second concrete unit, a first connecting steel bar and a second connecting steel bar; the outer end of the first connecting steel bar is fixedly provided with a first anchor plate; the outer end of the second connecting steel bar is fixedly provided with a second anchor plate; the first concrete unit and the second concrete unit are butt-jointed, the first connecting steel bar and the second connecting steel bar are indirectly overlapped, concrete is poured between the first concrete unit and the second concrete unit to form a cast-in-place concrete unit; it also includes a first buckle plate for connecting two adjacent first connecting steel bars and second connecting steel bars; the first buckle plate includes a connecting hole and a wedge-shaped connecting groove; the center line of the wedge-shaped connecting groove is in the form of an involute that gradually increases with the center radius of the connecting hole. The present invention greatly improves the shear resistance and tensile resistance between the two concrete units, and is easy to implement and promote, simple to operate, and highly efficient.

Description

Technical Field

[0001] The invention relates to the technical field of green energy-saving buildings, and in particular to a steel bar connection structure with an anchor plate. Background Art

[0002] Compared with traditional cast-in-place reinforced concrete structures, prefabricated reinforced concrete structures have the advantages of saving labor costs, reducing noise and dust pollution at the construction site, shortening construction period, better product quality control, high production efficiency, and high material utilization rate. In addition, factory-based production makes it easy to control and recycle wastewater and waste materials, which is in line with the development trend of the construction industry. However, there are a large number of steel bar connection nodes in prefabricated concrete structures. The connection nodes connect the prefabricated reinforced concrete components into a whole, so that the entire structure has sufficient bearing capacity, stiffness and ductility to resist earthquakes, accidental loads and wind loads. Therefore, the mechanical properties of the connection nodes have a vital influence on the overall performance of the structure. Whether its force is reasonable and whether the construction is convenient is the key to the prefabricated reinforced concrete structure technology. In traditional cast-in-place reinforced concrete structures, the connection of steel bars mostly adopts mechanical connection methods such as lap connection, welding connection or extrusion sleeve connection. These connection methods are less applicable in prefabricated reinforced concrete structures. The lap connection has high requirements on the joint length. According to the "Code for Design of Concrete Structures" GB 50010-2010, the steel bar lap length range is approximately 30d to 48d (d is the steel bar diameter). The larger lap length brings inconvenience to the construction; while welding connection or extrusion sleeve connection increases the workload of on-site construction and greatly reduces the construction efficiency, which is contrary to the high construction efficiency of prefabricated buildings.

[0003] For the connection of steel bars in prefabricated reinforced concrete structures, my country currently uses two connection technologies: grouting sleeves and restrained grout anchors. Both grouting sleeves and restrained grout anchors have obvious disadvantages, which are as follows: grouting sleeves, restrained grout anchors and other connection methods require high processing accuracy of prefabricated reinforced concrete shear walls. If the position of the steel bars is slightly deviated, it will be difficult for the on-site steel bars to penetrate into the sleeves. At the same time, due to the large number of shear wall steel bars and the high-altitude operation, the precision of on-site construction is extremely high. Inserting more than a dozen or even dozens of steel bars into the steel sleeve of the precast reinforced concrete shear wall at the same time is like threading a needle with several tons of weight in the air, which causes a series of specific problems and implementation costs such as great construction difficulty, high labor cost of professional teams, high cost of measures, waste parts, broken bars, etc.; after the protruding steel bars of the lower precast reinforced concrete shear wall are inserted into the reserved sleeve of the upper precast reinforced concrete shear wall, high-strength grouting material needs to be poured into the sleeve. Since this process has high operating requirements and is a hidden project, the construction quality of the steel sleeve grouting is difficult to guarantee, and even if problems are found, it is difficult to remedy them, and there are certain safety hazards; the advantage of prefabricated buildings is that they can improve on-site construction efficiency. However, due to the low processing precision of prefabricated components, the lack of industrial workers, and the difficulty of construction, the precast reinforced concrete shear wall structure in actual projects often does not have the construction speed as fast as the cast-in-place structure.

[0004] Therefore, in order to give full play to the high performance of prefabricated reinforced concrete structures, it is necessary to develop a new type of steel bar connection joint to achieve efficient connection of steel bars in prefabricated reinforced concrete structures, improve on-site construction quality, construction efficiency and construction error tolerance, and have good adaptability to my country's construction environment. Summary of the invention

[0005] The object of the present invention is to provide a steel bar connection structure with an anchor plate to solve at least one of the above-mentioned technical problems existing in the prior art. This application is a divisional application of the application date of June 14, 2022, application number 2022106692392, and name “A steel bar connection structure for prefabricated concrete buildings”.

[0006] In order to solve the above technical problems, the present invention provides a steel bar connection structure with an anchor plate, comprising: a first concrete unit, a second concrete unit, a first connection steel bar and a second connection steel bar;

[0007] The inner end of the first connecting steel bar is embedded in the first concrete unit, and the outer end of the first connecting steel bar extends from the connecting end of the first concrete unit;

[0008] The inner end of the second connecting steel bar is embedded in the second concrete unit, and the outer end of the second connecting steel bar extends from the connecting end of the second concrete unit;

[0009] A first anchor plate is fixedly provided at the outer end of the first connecting steel bar;

[0010] A second anchor plate is fixedly provided on the outer side end of the second connecting steel bar;

[0011] The first concrete unit and the second concrete unit are butt-jointed, the first connecting steel bar and the second connecting steel bar are indirectly overlapped, and concrete is poured between the first concrete unit and the second concrete unit to form a cast-in-place concrete unit.

[0012] The anchor plate can effectively improve the connection strength between the first concrete unit and the second concrete unit, and can significantly reduce the length of the connecting steel bars and the lap length between the first connecting steel bars and the second connecting steel bars.

[0013] The size of the steel bar anchor plate (i.e., the cross-sectional size) can be designed according to the height of the cast-in-place concrete unit. Increasing the cross-sectional size of the steel bar anchor plate can further improve the anchoring capacity of the steel bars in the cast-in-place concrete unit, thereby reducing the length of the indirect lap joint of the steel bars, matching the height of the cast-in-place concrete unit, avoiding secondary pouring, and simplifying construction.

[0014] Further, on a projection plane perpendicular to the first connecting steel bars and the second connecting steel bars (ie, a plane parallel to the cross sections of the first concrete unit and the second concrete unit), the first anchoring plate and the second anchoring plate are overlapped.

[0015] Furthermore, the first anchoring plate and the first connecting steel bar are arranged perpendicularly;

[0016] And / or, the second anchor plate and the second connecting steel bar are arranged perpendicularly.

[0017] Furthermore, the first anchor plate and the second anchor plate are square, diamond or circular plates. Also, the thickness of the steel bar anchor plate can be designed according to the diameter of the steel bar. Increasing the thickness of the steel bar anchor plate can increase the contact area between the steel bar anchor plate and the steel bar, thereby strengthening the fixed connection between the steel bar anchor plate and the steel bar.

[0018] Preferably, the (plate surface) area of ​​the first anchor plate and the second anchor plate is respectively greater than or equal to 6 times the cross-sectional area of ​​the first connecting steel bar and the second connecting steel bar; thereby providing sufficient steel bar anchoring bearing capacity, thereby enhancing the force transmission performance of the indirect lap steel bars.

[0019] Furthermore, the lap length of the first connecting steel bar and the second connecting steel bar is less than the height of the cast-in-place concrete unit; that is, the lap length or joint length of the first connecting steel bar and the second connecting steel bar is less than the spacing distance between the first concrete unit and the second concrete unit.

[0020] Furthermore, the surfaces of the connection end faces of the first concrete unit and the second concrete unit are roughened to strengthen the connectivity between the first concrete unit and the second concrete unit and the cast-in-place concrete unit.

[0021] Furthermore, stirrups are provided inside the cast-in-place concrete unit and outside the first connecting steel bar and the second connecting steel bar. The stirrups can be in the form of rectangular stirrups or spiral stirrups. The stirrups restrain the concrete in the overlap area, which can improve the anchoring performance of the steel bars in the cast-in-place concrete unit, thereby improving the force transmission performance of the steel bar connection joint. The stirrup spacing is within 40mm to 100mm, which not only meets the maximum aggregate particle size requirements of the concrete, but also has a strong restraining effect on the core concrete.

[0022] Furthermore, at least one of the first concrete unit and the second concrete unit is a precast concrete unit.

[0023] Furthermore, the first anchor plate and the second anchor plate are respectively fixed to the first connecting steel bar and the second connecting steel bar by means of perforation plug welding or threaded connection.

[0024] Furthermore, the end surfaces of the first concrete unit and the second concrete unit are roughened to enhance connectivity with the cast-in-place concrete unit.

[0025] The size of the anchor plate can be determined according to the height of the cast-in-place concrete unit. The anchor plate can significantly improve the anchoring performance of the steel bar; increasing the cross-sectional area of ​​the steel bar anchor plate can further improve the anchoring performance of the steel bar, thereby improving the force transmission performance of the indirect lap steel bar and reducing the length of the steel bar joint.

[0026] Furthermore, the outer end of each of the first connecting steel bars comprises a plurality of the first anchor plates spaced apart in the axial direction;

[0027] And / or, the outer end of each of the second connecting steel bars includes a plurality of the second anchor plates arranged at intervals along the axial direction.

[0028] Arranging 2-5 or even more anchor plates along the axial direction of the steel bar can further improve the anchoring performance of the steel bar, thereby improving the force transmission performance of the indirect lap steel bar. The distance between the steel bar anchor plates can be designed according to the specific project conditions to achieve optimal performance.

[0029] Among them, the cast-in-place concrete unit preferably uses concrete of grade C30 or above, which can enhance the bonding effect between the steel bars and the concrete, thereby improving the force transmission performance of the indirect lap steel bars.

[0030] Furthermore, it also includes a spiral steel bar that is sleeved outside the first connecting steel bar or the second connecting steel bar; one end of the spiral steel bar is pre-buried in the first concrete unit or the second concrete unit, and the other end of the spiral steel bar extends out of the end face of the first concrete unit or the second concrete unit; when the first concrete unit and the second concrete unit are butt-jointed, the second connecting steel bar or the first connecting steel bar is inserted into the spiral steel bar from the outside.

[0031] After pouring concrete between the first concrete unit and the second concrete unit, the spiral reinforcement is embedded in the cast-in-place concrete unit. The spiral reinforcement restrains the concrete in the overlapped area, further improving the force transmission performance of the reinforcement connection joint.

[0032] Furthermore, it also includes an outer sleeve that is sleeved outside the first connecting steel bar or the second connecting steel bar; one end of the outer sleeve is pre-buried in the first concrete unit or the second concrete unit, and the other end of the outer sleeve extends out of the end face of the first concrete unit or the second concrete unit; when the first concrete unit and the second concrete unit are butt-jointed, the second connecting steel bar or the first connecting steel bar is inserted into the outer sleeve from the outside. It is used to enhance the restraint effect on the core concrete of the cast-in-place concrete unit and further improve the force transmission performance of the steel bar connection joint.

[0033] Furthermore, the outer sleeve is a steel pipe, a metal bellows or an FRP pipe.

[0034] Furthermore, the first concrete unit and / or the second concrete unit is a column, a shear wall, a beam or a pile.

[0035] The present invention provides a steel bar connection structure for a prefabricated concrete building, which realizes efficient connection of steel bars in prefabricated components and has the following characteristics:

[0036] 1. The cast-in-place construction method is adopted. The construction quality can be observed intuitively during the construction process. If construction quality defects are found, they can be remedied on site, avoiding the potential safety hazards caused by hidden grouting construction. While improving the construction quality, it also saves the need for professional inspectors to check the grouting construction quality in the later stage. In summary, the present invention not only ensures the quality of the steel bar connection joints in the assembled reinforced concrete structure, but also improves the construction speed to a certain extent and reduces the construction cost.

[0037] 2. The prior art requires grouting construction, and usually requires construction training for grouting workers to ensure the reliability of the grouting construction quality, and the grouting construction quality is difficult to ensure. The present invention eliminates the grouting construction and replaces it with indirect lap joint of steel bars. As a common and basic steel bar structure, steel bar lap joint connection can be completed well by workers without additional training.

[0038] 3. Due to the cancellation of grouting construction, there is no need to use high-strength grouting materials during on-site connection, which saves construction material costs and conforms to the concept of energy conservation and environmental protection.

[0039] 4. The present invention connects steel bars by using indirect overlapping of steel bars as the basic structural form, eliminating the construction step of steel bar positioning holes, which is beneficial to improving the construction error tolerance and improving the construction efficiency.

[0040] 5. The use of grouting sleeves and constrained grout anchor connection technology requires prefabrication of grouting sleeves, grouting pipes, etc. in the factory in advance; at the same time, in the PC component processing plant, it is necessary to reserve grouting holes for concrete components; in addition, at the construction site, it is also necessary to prepare high-strength grouting materials for connection, and these processes increase the cost of construction. The present invention does not require the reservation of grouting holes, cancels the on-site grouting construction, can reduce the processing procedures of the prefabrication plant, and reduce the on-site construction cost.

[0041] 6. The present invention proposes a steel bar connection technology and a construction method in a prefabricated reinforced concrete structure, which can be applied to the connection of steel bars in transverse components such as beams and slabs, and can also be applied to the connection of steel bars in vertical components such as columns and walls, and has great adaptability in different types of prefabricated reinforced concrete components; in addition, the steel bar connection technology and the construction method in the prefabricated reinforced concrete structure of the present invention can be applied to the connection of steel bars of various diameters, and can provide greater freedom for design and construction.

[0042] 7. The steel bar connection section can be constructed together with the cast-in-place sections of beams, slabs and other components to improve construction efficiency.

[0043] 8. The length of the steel bar joint is related to the number and size of the anchor plates. The joint length can be flexibly designed according to the actual project conditions, which has great flexibility.

[0044] 9. The steel bar joints are highly prefabricated and require less wet work on site, which is in line with the characteristics of prefabricated buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 It is a three-dimensional diagram of the steel bar connection structure in Example 1 of the present invention;

[0047] Figure 2 for Figure 1 Cross-sectional view of the steel bar connection structure;

[0048] Figure 3 It is a three-dimensional diagram of the steel bar connection structure when stirrups are provided in Example 1 of the present invention;

[0049] Figure 4 for Figure 3 Cross-sectional view of the steel bar connection structure;

[0050] Figure 5 A three-dimensional diagram of a steel bar connection structure when a plurality of anchor plates are arranged at intervals in Example 1;

[0051] Figure 6 is a three-dimensional diagram of a steel bar connection structure in Example 2 of the present invention;

[0052] Figure 7 for Figure 6 Cross-sectional view of the steel bar connection structure;

[0053] Figure 8 is a three-dimensional diagram of a steel bar connection structure in Example 3 of the present invention;

[0054] Fig. 9 for Figure 8 Cross-sectional view of the steel bar connection structure;

[0055] Fig.10 It is a three-dimensional diagram of the steel bar connection structure in Example 4 of the present invention;

[0056] Fig.11 This is a schematic structural diagram of the first gusset plate in Embodiment 4 of the present invention;

[0057] Fig.12 is a three-dimensional diagram of a steel bar connection structure in Example 5 of the present invention;

[0058] Fig.13 This is a schematic diagram of the structure of the first gusset plate in Example 5 of the present invention;

[0059] Fig.14 It is a three-dimensional diagram of the steel bar connection structure in Example 6 of the present invention.

[0060] Reference numerals:

[0061] 1-first concrete unit; 2-first connecting steel bar; 3a-first anchor plate; 3b-second anchor plate; 4-second concrete unit; 5-second connecting steel bar; 6-cast-in-place concrete unit; 7-hoops; 8-spiral steel bar; 9-outer casing; 10-first buckle plate; 10a-second buckle plate; 11-connecting hole; 12-wedge-shaped connecting groove; 13-card slot; 14-U-shaped long groove. DETAILED DESCRIPTION

[0062] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0064] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] The present invention is further explained below in conjunction with specific implementation modes.

[0066] Example 1

[0067] like Figure 1-2 As shown, the present embodiment provides a steel bar connection structure for a prefabricated concrete building, comprising: a first concrete unit 1, a second concrete unit 4, a first connecting steel bar 2 and a second connecting steel bar 5;

[0068] The inner end of the first connecting steel bar 2 is embedded in the first concrete unit 1, and the outer end of the first connecting steel bar 2 extends from the connecting end of the first concrete unit 1; the inner end of the second connecting steel bar 5 is embedded in the second concrete unit 4, and the outer end of the second connecting steel bar 5 extends from the connecting end of the second concrete unit 4; the outer end of the first connecting steel bar 2 is fixedly provided with a first anchor plate 3a; the outer end of the second connecting steel bar 5 is fixedly provided with a second anchor plate 3b; the first concrete unit 1 and the second concrete unit 4 are butt-jointed, the first connecting steel bar 2 and the second connecting steel bar 5 are indirectly overlapped, and concrete is poured between the first concrete unit 1 and the second concrete unit 4 to form a cast-in-place concrete unit 6.

[0069] The anchor plate can effectively improve the connection strength between the first concrete unit 1 and the second concrete unit 4, and significantly reduce the length of the connecting steel bars and the lap length between the first connecting steel bars 2 and the second connecting steel bars 5.

[0070] The size of the steel bar anchor plate (i.e., the cross-sectional size) can be designed according to the height of the cast-in-place concrete unit. Increasing the cross-sectional size of the steel bar anchor plate can further improve the anchoring capacity of the steel bars in the cast-in-place concrete unit 6, thereby reducing the length of the indirect lap joint of the steel bars, matching the height of the cast-in-place concrete unit, avoiding secondary pouring, and simplifying construction.

[0071] More preferably, the first anchor plate 3a and the second anchor plate 3b are overlapped on a projection plane perpendicular to the first connecting steel bar 2 and the second connecting steel bar 5 (ie, a plane parallel to the cross-sections of the first concrete unit 1 and the second concrete unit 4).

[0072] Furthermore, the first anchor plate 3 a is vertically arranged to the first connecting steel bar 2 ; and the second anchor plate 3 b is vertically arranged to the second connecting steel bar 5 .

[0073] Furthermore, the first anchor plate 3a and the second anchor plate 3b are square, diamond or circular plates. Also, the thickness of the steel bar anchor plate can be designed according to the diameter of the steel bar. Increasing the thickness of the steel bar anchor plate can increase the contact area between the steel bar anchor plate and the steel bar, thereby strengthening the fixed connection between the steel bar anchor plate and the steel bar.

[0074] Preferably, the (plate surface) area of ​​the first anchor plate 3a and the second anchor plate 3b is respectively greater than or equal to 6 times the cross-sectional area of ​​the first connecting steel bar 2 and the second connecting steel bar 5; thereby providing sufficient steel bar anchoring bearing capacity, thereby enhancing the force transmission performance of the indirect lap steel bars.

[0075] Furthermore, the lap length of the first connecting steel bar 2 and the second connecting steel bar 5 is less than the height of the cast-in-place concrete unit 6; that is, the lap length or joint length of the first connecting steel bar 2 and the second connecting steel bar 5 is less than the spacing distance between the first concrete unit 1 and the second concrete unit 4.

[0076] Furthermore, the surfaces of the connection end faces of the first concrete unit 1 and the second concrete unit 4 are roughened to strengthen the connectivity between the first concrete unit 1 and the second concrete unit 4 and the cast-in-place concrete unit 6 .

[0077] See also Figure 3As shown, stirrups 7 may be optionally provided inside the cast-in-place concrete unit 6 and around the first connecting steel bar 2 and the second connecting steel bar 5. The stirrups 7 may be in the form of rectangular stirrups or spiral stirrups. The stirrups 7 constrain the concrete in the overlap area, and can improve the anchoring performance of the steel bar in the cast-in-place concrete unit 6, thereby improving the force transmission performance of the steel bar connection joint. The spacing of the stirrups 7 is within 40 mm to 100 mm, which not only meets the maximum aggregate particle size requirements of the concrete, but also has a strong constraining effect on the core concrete.

[0078] The first concrete unit 1 and the second concrete unit 4 are preferably prefabricated concrete units. Figure 4 As shown, more preferably, one end of the stirrup 7 is embedded in the first concrete unit 1 or the second concrete unit 4, and the other end of the stirrup 7 extends out. When the first concrete unit 1 and the second concrete unit 4 are butt-jointed, the second connecting steel bar 5 or the first connecting steel bar 2 is inserted into the stirrup 7 from the outside.

[0079] The first anchor plate 3a and the second anchor plate 3b can be fixed to the first connecting steel bar 2 and the second connecting steel bar 5 respectively by plug welding or threaded connection. Also, the end faces of the first concrete unit 1 and the second concrete unit 4 can be roughened to strengthen the connectivity with the cast-in-place concrete unit 6.

[0080] The size of the anchor plate can be determined according to the height of the cast-in-place concrete unit. The anchor plate can significantly improve the anchoring performance of the steel bar; increasing the cross-sectional area of ​​the steel bar anchor plate can further improve the anchoring performance of the steel bar, thereby improving the force transmission performance of the indirect lap steel bar and reducing the length of the steel bar joint.

[0081] Reference Figure 5 As shown, the outer end of each of the first connecting steel bars 2 includes a plurality of first anchor plates 3a arranged at intervals along the axial direction; the outer end of each of the second connecting steel bars 5 includes a plurality of second anchor plates 3b arranged at intervals along the axial direction.

[0082] Arranging 2-5 or even more anchor plates along the axial direction of the steel bar can further improve the anchoring performance of the steel bar, thereby improving the force transmission performance of the indirect lap steel bar. The distance between the steel bar anchor plates can be designed according to the specific project conditions to achieve optimal performance.

[0083] The cast-in-place concrete unit 6 preferably uses concrete of grade C30 or above, which can enhance the bonding effect between the steel bars and the concrete, thereby improving the force transmission performance of the indirect lap steel bars.

[0084] The construction process includes the following steps:

[0085] Step 1: According to the design requirements, the first connecting steel bar 2, the second connecting steel bar 5 and the first anchor plate 3a and the second anchor plate 3b are prefabricated in the factory in advance, and the anchor plates and the steel bars are fixedly connected as required. The fixed connection can be in the form of perforated plug welding or threaded connection.

[0086] Step 2: In a PC component processing plant, the first concrete unit 1 and the second concrete unit 4 are prefabricated and processed. The production process is strictly in accordance with the design drawings to embed and fix the first connecting steel bars 2 and the second connecting steel bars 5 respectively.

[0087] Preferably, the stirrups 7 are fixed to the first concrete unit 1 according to the design requirements, so that the stirrups 7 wrap the first connecting steel bars 2 and the first anchor plate 3a in the first concrete unit 1, and leave enough space so that the second connecting steel bars 5 and the second anchor plate 3b in the second concrete unit 4 can be inserted into the stirrups 7.

[0088] Step 3: Cast the first concrete unit 1 and the second concrete unit 4 and cure them to the required strength. Roughen the surfaces of the first concrete unit 1 and the second concrete unit 4 and transport them to the construction site.

[0089] Step 4: hoist and fix the first concrete unit 1 and the second concrete unit 4, and form an indirect overlap structure with the second connecting steel bar 5 and the second anchor plate 3b in the second precast concrete unit and the first connecting steel bar 2 and the first anchor plate 3a in the first concrete unit 1.

[0090] Step 5: Formwork and pouring of the cast-in-place concrete unit 6 are carried out on site. After the concrete strength reaches the design requirements, the temporary support is removed and the steel bar connection construction in the prefabricated reinforced concrete structure is completed.

[0091] The first concrete unit 1 and / or the second concrete unit 4 may be a column, a shear wall, a beam or a pile.

[0092] A steel bar connection structure provided by the present invention realizes efficient connection of steel bars in prefabricated components; adopts a cast-in-place construction method, eliminates the hidden sleeve grouting and constrained grouting works, is intuitive to operate, and is easy to inspect for quality, and can effectively ensure the construction quality of steel bar joints; eliminates the construction steps of on-site steel bar positioning and punching, improves the construction error tolerance, reduces the construction difficulty, and improves the construction efficiency.

[0093] Mechanical connection methods such as steel bar lap joints, welding connections or extrusion sleeves in traditional cast-in-place concrete structures cannot adapt to the construction characteristics of prefabricated concrete structures. The present invention develops a steel bar connection joint based on the construction characteristics of prefabricated concrete structures, which can achieve efficient connection of steel bars in prefabricated concrete structures.

[0094] For the connection of steel bars in prefabricated concrete structures, domestic projects usually use grouting sleeves and constrained grout anchor connection technologies. Both of these connection technologies require grouting into the reserved channels of the prefabricated concrete units. The grouting construction is a hidden project, so it is impossible to visually supervise the grouting construction, which causes grouting quality problems and grouting defects, which have an adverse effect on the overall performance of the prefabricated concrete structure. The present invention eliminates the hidden grouting construction and adopts cast-in-place construction methods, which can solve the grouting defect problem of the prior art.

[0095] Example 2

[0096] This embodiment is basically the same as Embodiment 1, except that:

[0097] Reference Figure 6 and 7 As shown, this embodiment includes a spiral steel bar 8 which is sleeved outside the first connecting steel bar 2 or the second connecting steel bar 5; one end of the spiral steel bar 8 is pre-buried in the first concrete unit 1 or the second concrete unit 4, and the other end of the spiral steel bar 8 extends out of the end surface of the first concrete unit 1 or the second concrete unit 4; when the first concrete unit 1 and the second concrete unit 4 are butt-jointed, the second connecting steel bar 5 or the first connecting steel bar 2 is inserted into the spiral steel bar 8 from the outside.

[0098] After pouring concrete between the first concrete unit 1 and the second concrete unit 4, the spiral reinforcement 8 is buried in the cast-in-place concrete unit. The spiral reinforcement restrains the concrete in the overlapped area, further improving the force transmission performance of the reinforcement connection joint.

[0099] Example 3

[0100] This embodiment is basically the same as Embodiment 1, except that:

[0101] Reference Figure 8 and 9 As shown, this embodiment includes an outer sleeve 9 sleeved on the first connecting steel bar 2 or the second connecting steel bar 5; one end of the outer sleeve 9 is pre-buried in the first concrete unit 1 or the second concrete unit 4, and the other end of the outer sleeve 9 extends out of the end surface of the first concrete unit 1 or the second concrete unit 4; when the first concrete unit 1 and the second concrete unit 4 are butt-jointed, the second connecting steel bar 5 or the first connecting steel bar 2 is inserted from the outside into the outer sleeve 9. It is used to enhance the restraint effect on the core concrete of the cast-in-place concrete unit and further improve the force transmission performance of the steel bar connection joint.

[0102] The outer sleeve 9 may be a steel pipe, a metal bellows or an FRP pipe, and more preferably a metal bellows.

[0103] Example 4

[0104] This embodiment is basically the same as Embodiment 1, except that:

[0105] Reference Fig.10 As shown, this embodiment also includes a first gusset plate 10 for connecting two adjacent first connecting steel bars 2 and second connecting steel bars 5.

[0106] Reference Fig.11 As shown, the first gusset plate 10 includes a connection hole 11 and a wedge-shaped connection groove 12 (a connection groove with a larger opening). The second connection steel bar 5 (or the first connection steel bar 2) is provided with a protruding tail on the outside of the second anchor plate 3b (or the first anchor plate 3a). When connected, the connection hole 11 is mounted on the tail of the second connection steel bar 5. By rotating the first gusset plate 10, the first connection steel bar 2 slides into the wedge-shaped connection groove 12. The center line of the wedge-shaped connection groove 12 is in the form of an involute that gradually increases with the center radius of the connection hole 11, and the wedge-shaped connection groove 12 has a large opening and a narrow bottom. The first connection steel bar 2 is gradually clamped or pressed against a side wall of the wedge-shaped connection groove 12 during the process of sliding into the wedge-shaped connection groove 12, thereby realizing a rigid connection between the first connection steel bar 2 and the second connection steel bar 5 in the transverse direction, and increasing the shear force transmission capacity of the two.

[0107] Furthermore, the side walls on the left and right sides of the wedge-shaped connecting groove 12 are provided with locking grooves 13 at intervals. After the first connecting steel bar 2 slides into the locking grooves 13, the first connecting steel bar 2 is further locked to increase the connection strength between the two.

[0108] Example 5

[0109] This embodiment is basically the same as Embodiment 4, except that:

[0110] Reference Fig.12 As shown, in this embodiment, a second gusset plate 10a is included for connecting two adjacent first connecting steel bars 2 and second connecting steel bars 5. The two ends of the second gusset plate 10a are clamped between the two first anchor plates 3a and the two second anchor plates 3b, respectively. Thus, a rigid or semi-rigid connection between the first connecting steel bars 2 and the second connecting steel bars 5 in the axial direction is achieved, further increasing the connection force between the upper and lower concrete units.

[0111] Reference Fig.13 As shown, the second clip plate 10a includes two U-shaped long grooves 14 arranged perpendicular to each other. The two U-shaped long grooves 14 arranged perpendicular to each other make the second clip plate 10a of this embodiment very versatile. Even if the spacing between the first connecting steel bars 2 and the second connecting steel bars 5 varies greatly, the same second clip plate 10a can be used to quickly realize the connection between two adjacent first connecting steel bars 2 and the second connecting steel bars 5.

[0112] Example 6

[0113] Reference Fig.14 As shown, in this embodiment, two adjacent first connecting steel bars 2 and second connecting steel bars 5 are directly connected through the first gusset plate 10 and the second gusset plate 10a.

[0114] Two first anchor plates 3a are arranged at intervals on the first connecting steel bar 2; second anchor plates 3b are arranged at intervals on the second connecting steel bar 5, and the second connecting steel bar 5 is provided with a tail portion on the outer side of the second anchor plate 3b, one end of the first clip plate 10 is mounted on the tail portion of the second connecting steel bar 5 through a connecting hole 11, and the other end of the first clip plate 10 is connected to the first connecting steel bar 2 through a wedge-shaped connecting groove 12.

[0115] The second gusset plate 10a is connected to the first connecting steel bar 2 and the second connecting steel bar 5 through the U-shaped long grooves 14 at both ends, and both ends of the second gusset plate 10a are clamped between the two first anchor plates 3a and the two second anchor plates 3b.

[0116] This embodiment combines the advantages of the connection structures of Embodiments 4 and 5, greatly improves the shear resistance and tensile resistance between the two concrete units, is easy to implement and promote, is simple to operate, and is highly efficient.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel bar connection structure with an anchor plate, characterized in that: include: a first concrete unit, a second concrete unit, a first connecting steel bar, and a second connecting steel bar; The inner end of the first connecting steel bar is embedded in the first concrete unit, and the outer end of the first connecting steel bar extends from the connecting end of the first concrete unit; The inner end of the second connecting steel bar is embedded in the second concrete unit, and the outer end of the second connecting steel bar extends from the connecting end of the second concrete unit; A first anchor plate is fixedly provided at the outer end of the first connecting steel bar; A second anchor plate is fixedly provided on the outer side end of the second connecting steel bar; The first concrete unit and the second concrete unit are butted against each other, the first connecting steel bar and the second connecting steel bar are indirectly overlapped, and concrete is poured between the first concrete unit and the second concrete unit to form a cast-in-place concrete unit; It also includes a first gusset plate for connecting two adjacent first connecting steel bars and a second connecting steel bar; The first gusset plate includes a connection hole and a wedge-shaped connection groove; wherein the second connection steel bar is provided with a protruding tail portion on the outer side of the second anchor plate, and when connected, the connection hole is sleeved on the tail portion of the second connection steel bar, and the first connection steel bar is slid into the wedge-shaped connection groove by rotating the first gusset plate; The center line of the wedge-shaped connecting groove is in the form of an involute that gradually increases with the center radius of the connecting hole.

2. The steel bar connection structure according to claim 1, characterized in that: The wedge-shaped connecting groove has a large opening and a narrow groove bottom, and the first connecting steel bar is gradually clamped during the process of sliding into the wedge-shaped connecting groove.

3. The steel bar connection structure according to claim 1, characterized in that: The side walls on the left and right sides of the wedge-shaped connecting groove are provided with clamping grooves at intervals, and after the first connecting steel bar slides into the clamping groove, the first connecting steel bar is further locked.

4. The steel bar connection structure according to claim 1, characterized in that: It also includes a second gusset plate for connecting two adjacent first connecting steel bars and second connecting steel bars; two ends of the second gusset plate are respectively clamped between the two first anchor plates and the two second anchor plates.

5. The steel bar connection structure according to claim 4, characterized in that: The second gusset plate includes two U-shaped long grooves arranged perpendicular to each other.

6. The steel bar connection structure according to claim 5, characterized in that: Two adjacent first connecting steel bars and second connecting steel bars are directly connected through a first gusset plate and a second gusset plate; Two first anchor plates are arranged at intervals on the first connecting steel bar; second anchor plates arranged at intervals are arranged on the second connecting steel bar, and the second connecting steel bar is provided with a tail portion on the outer side of the second anchor plate, one end of the first gusset plate is sleeved on the tail portion of the second connecting steel bar through a connecting hole, and the other end of the first gusset plate is connected to the first connecting steel bar through a wedge-shaped connecting groove; The second gusset plate is connected to the first connecting steel bar and the second connecting steel bar through the U-shaped long grooves at both ends, and the two ends of the second gusset plate are clamped between the two first anchor plates and the two second anchor plates.

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