A prefabricated primary and secondary beam steel tongue and groove rigid combined connection node and connection method

Abstract

The present invention relates to a prefabricated primary and secondary beam steel tongue rigid combination connection node and connection method, and belongs to the field of prefabricated components of construction engineering. The present invention discloses a connection node of a prefabricated concrete primary beam and a prefabricated concrete secondary beam, including a top cast-in-place superimposed layer, a steel tongue connection node and a bottom connection node. The top cast-in-place superimposed layer of the prefabricated primary beam and the top cast-in-place superimposed layer of the prefabricated secondary beam form the top cast-in-place superimposed layer of the prefabricated primary and secondary beams. In the cast-in-place area at the connection of the prefabricated primary beam, the pre-embedded steel tongue of the prefabricated secondary beam and the pre-embedded steel tongue pressure plate and anchoring bars of the prefabricated primary and secondary beams form the steel tongue connection node of the prefabricated primary and secondary beams. In the cast-in-place area at the bottom of the prefabricated secondary beam, the extended section of the prefabricated secondary beam, the main beam pre-embedded secondary beam bottom reinforcement and the sleeve form the bottom connection node of the prefabricated primary and secondary beams. The present invention connects the embedded secondary beam bottom reinforcement of the main beam and the extended section of the prefabricated secondary beam bottom reinforcement by using a steel tongue-and-groove connection and a sleeve, so that the connection of the prefabricated main and secondary beams has good integrity, strong bending, shear and torsion bearing capacity, and reaches the same strength as the connection of the main and secondary beams with cast-in-place concrete.

Description

Technical Field

[0001] The invention relates to a prefabricated primary and secondary beam steel tongue and groove rigid combined connection node and a connection method. Background Art

[0002] At present, the connection methods of precast concrete main and secondary beams mainly include precast concrete main beam cast-in-place strip, precast concrete secondary beam cast-in-place strip and steel tongue and groove secondary beam. The above connection methods have the following disadvantages:

[0003] 1. The cast-in-place strip of the precast concrete main beam weakens the integrity of the main beam at the connection between the precast main and secondary beams, and the shear and torsion bearing capacity is reduced; the connection between the main and secondary beams is often the position with the largest stress in the span of the main beam, and it is also the area where the secondary beam transfers force to the main beam, and it is the place with the largest shear force and torque. Therefore, in order to make the structural bearing capacity meet the force requirements, the precast main beam needs to be strengthened during the design process. When the precast main beam needs to be torsion-resistant, the above connection method is adopted. Since the cast-in-place strip disconnects the torsion waist reinforcement, it is necessary to embed a mechanical sleeve at the waist reinforcement of the main beam to mechanically connect the waist reinforcement. The shear and torsion bearing capacity of the full cross-section of the precast main beam cannot be fully utilized at the connection between the main and secondary beams, resulting in material waste; the torsion waist reinforcement needs to be post-processed in the post-cast strip, which is not conducive to the construction.

[0004] 2. The cast-in-place strip of the prefabricated secondary beam weakens the integrity of the end of the prefabricated secondary beam, and the shear bearing capacity is reduced; and the end of the secondary beam is often the point where the shear force is the largest. Therefore, in order to make the structural bearing capacity meet the force requirements, the prefabricated secondary beam needs to be strengthened during the design process. At the same time, the cast-in-place strip will make it difficult to insert the stirrups of the secondary beam, and more construction templates and supports are required, which is not conducive to the construction.

[0005] 3. The steel tongue-and-groove secondary beam connection is a hinged connection, and the integrity of the primary and secondary beam nodes is poor. During the construction process, the prefabricated primary and secondary beams are prone to misalignment, which weakens the overall horizontal stiffness of the structure and affects the integrity and seismic performance of the prefabricated building. At the same time, the steel tongue-and-groove secondary beam will increase the deflection of the secondary beam according to the hinge calculation during the design process. In order to reduce the deflection of the secondary beam, it is necessary to increase the cross-sectional area of ​​the secondary beam or increase the bottom reinforcement of the secondary beam, which is less economical. Summary of the invention

[0006] In view of the deficiencies of the above-mentioned prior art, the present invention provides a prefabricated primary and secondary beam steel tongue-and-groove rigid combined connection node and connection method, which has good integrity at the joints of the prefabricated primary and secondary beams, strong bending, shear and torsion bearing capacity, and can achieve a strength equivalent to that of the cast-in-place concrete primary and secondary beam connections.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A prefabricated main and secondary beam steel tongue rigid combined connection node, comprising a prefabricated concrete main beam and a prefabricated concrete secondary beam, wherein the prefabricated concrete main beam comprises a prefabricated main beam, a cast-in-place superimposed layer at the top of the prefabricated main beam, a cast-in-place area at the connection of the prefabricated main beam, a prefabricated main beam embedded steel tongue pressure plate and anchor bars, and a prefabricated main beam embedded main beam bottom bar, the prefabricated concrete secondary beam comprises a prefabricated secondary beam, a cast-in-place superimposed layer at the top of the prefabricated secondary beam, a prefabricated secondary beam embedded steel tongue and a cast-in-place area at the bottom of the prefabricated secondary beam; the prefabricated concrete main beam and the prefabricated concrete secondary beam The connection nodes include the top cast-in-place superimposed layer, the steel tongue connection node and the bottom connection node; the top cast-in-place superimposed layer of the precast main beam and the top cast-in-place superimposed layer of the precast secondary beam form the top cast-in-place superimposed layer of the precast primary and secondary beams; in the cast-in-place area at the connection of the precast main beam, the pre-embedded steel tongue of the precast secondary beam and the pre-embedded steel tongue bearing plate and anchor bars of the precast main beam constitute the steel tongue connection node of the precast primary and secondary beams; in the cast-in-place area at the bottom of the precast secondary beam, the protruding section of the bottom reinforcement of the precast secondary beam, the main beam embedded secondary beam bottom reinforcement and the sleeve constitute the bottom connection node of the precast primary and secondary beams.

[0009] There is a notch for placing the steel tongue in the cast-in-place area at the connection of the precast main beam, and a steel tongue pressure plate and anchor bars are embedded below the notch; a vertically arranged steel tongue is embedded at the connection end of the precast secondary beam, and the steel tongue includes a steel tongue embedded section embedded in the precast secondary beam, a steel tongue extended section extending out of the precast secondary beam, and steel tongue bolts vertically welded on both sides of the steel tongue body; the steel tongue embedded section is fixed by the steel tongue bolts and the reinforcing bars vertically hooped on the steel tongue and embedded in the precast secondary beam; the steel tongue extended section is inserted into the notch for placing the steel tongue in the cast-in-place area at the connection of the precast main beam and is placed on the steel tongue pressure plate and anchor bars, and then cast-in-place filling is used with non-shrinkage mortar to form the steel tongue connection node of the precast primary and secondary beams.

[0010] More than two precast secondary beam bottom reinforcement extension sections extend from the cast-in-place area at the bottom of the precast secondary beam at the bottom of the precast secondary beam connection end, the same number of main beam embedded secondary beam bottom reinforcements are embedded in the bottom of the precast main beam and extend out, each precast secondary beam bottom reinforcement extension section is connected to the corresponding main beam embedded secondary beam bottom reinforcement through a sleeve located in the cast-in-place area at the bottom of the precast secondary beam, and fine stone concrete is used to cast in-place to form the bottom connection node of the precast main and secondary beams.

[0011] More than two secondary beam longitudinal stress-bearing reinforcements are arranged in the cast-in-place superimposed layer on the top of the precast secondary beam, and each secondary beam longitudinal stress-bearing reinforcement runs through the cast-in-place superimposed layer on the top of the precast secondary beam and the cast-in-place superimposed layer on the top of the precast main beam.

[0012] The stirrups arranged in the precast secondary beam include ordinary secondary beam stirrups and secondary beam composite stirrups; the top of the ordinary secondary beam stirrups extends into the cast-in-place superimposed layer at the top of the precast secondary beam and is hooped on the longitudinal force-bearing surface reinforcement of the secondary beam, and the remaining part is pre-embedded in the precast secondary beam and hooped under the precast secondary beam bottom reinforcement at the bottom; the secondary beam composite stirrups include the first beam composite stirrups, the second beam composite stirrups and the secondary beam composite stirrup connecting reinforcement; the top of the first beam composite stirrups extends into the cast-in-place superimposed layer at the top of the precast secondary beam and is hooped on the longitudinal force-bearing surface reinforcement of the secondary beam, the middle part is pre-embedded in the precast secondary beam, and the bottom extends out of the precast secondary beam and extends into the cast-in-place area at the bottom of the precast secondary beam; in the cast-in-place area at the bottom of the precast secondary beam, the bottom of the second beam composite stirrups is hooped under the protruding section of the precast secondary beam bottom reinforcement connected into a whole by sleeves and the embedded secondary beam bottom reinforcement of the main beam; each first beam composite stirrup and the corresponding second beam composite stirrup are connected to the secondary beam composite stirrup connecting reinforcement to form a complete secondary beam composite stirrup.

[0013] The contact surface between the cast-in-place overlapping layer of the precast main beam and the top of the precast main beam, the contact surface between the cast-in-place overlapping layer of the precast secondary beam and the cast-in-place area of ​​the bottom of the precast secondary beam and the bottom of the precast secondary beam are all provided with a rough surface with a convexity of not less than 4mm; the contact surface of the cast-in-place area at the connection between the precast main beam and the precast main beam and the cast-in-place area at the connection between the precast secondary beam and the precast main beam are all set to smooth surfaces.

[0014] The present invention also provides a method for connecting a prefabricated primary and secondary beam steel tongue-and-groove rigid combined connection node, comprising the following steps:

[0015] The first step is to prefabricate the main beam: at the connection between the prefabricated main beam and the prefabricated secondary beam, a cast-in-place area for placing the steel groove extension section and the prefabricated main beam connection for connecting the main and secondary beam nodes is reserved; a steel groove bearing plate and anchor bars are embedded below the notch of the cast-in-place area for placing the steel groove extension section; two or more main beams and secondary beam bottom bars are embedded at the bottom of the prefabricated main beam; a cast-in-place superimposed layer at the top of the prefabricated main beam is reserved; and the contact surface between the prefabricated main beam and the cast-in-place superimposed layer at the top of the prefabricated main beam is roughened;

[0016] The second step is to prefabricate the secondary beam: embed a vertical steel groove at the connection end of the prefabricated secondary beam, fix the embedded section of the steel groove with steel groove bolts and reinforcement bars and embed it in the prefabricated secondary beam, so that the protruding section of the steel groove is exposed outside the prefabricated secondary beam, reserve a section of the prefabricated secondary beam bottom cast-in-place area at the bottom of the prefabricated secondary beam connection end, extend two or more prefabricated secondary beam bottom reinforcement protruding sections from the prefabricated secondary beam bottom cast-in-place area, set ordinary secondary beam stirrups in the prefabricated secondary beam without prefabricated secondary beam bottom cast-in-place section, and set secondary beam stirrups in the prefabricated secondary beam with prefabricated secondary beam bottom cast-in-place section Combined stirrups, so that the top of the ordinary secondary beam stirrups extends into the cast-in-place superimposed layer at the top of the secondary beam, the remaining part is pre-buried in the precast secondary beam and hooped under the bottom reinforcement of the precast secondary beam at the bottom, so that the top of the first beam combined stirrups extends into the cast-in-place superimposed layer at the top of the precast secondary beam, the middle part is pre-buried in the precast secondary beam, and the bottom extends into the cast-in-place area at the bottom of the precast secondary beam, the cast-in-place superimposed layer at the top of the precast secondary beam is reserved, and the contact surface between the precast secondary beam and the cast-in-place superimposed layer at the top of the precast secondary beam and the contact surface between the bottom of the precast secondary beam and the cast-in-place area at the bottom of the precast secondary beam is roughened;

[0017] The third step is the hoisting of the prefabricated main beam: hoist the prefabricated main beam to the predetermined position;

[0018] The fourth step is to set the secondary beam composite stirrup connection reinforcement: place and fix the two secondary beam composite stirrup connection reinforcements on the first beam composite stirrups respectively;

[0019] Step 5: Hoisting of precast secondary beams: hoist the precast secondary beams to the predetermined position, and place the steel tongue extension section of the precast secondary beams in the gap of the cast-in-place area at the connection of the precast main beams above the steel tongue pressure plate and the anchor bar;

[0020] Step 6: Connect the extended section of the prefabricated secondary beam bottom reinforcement with the embedded secondary beam bottom reinforcement of the main beam: connect each extended section of the prefabricated secondary beam bottom reinforcement with the corresponding embedded secondary beam bottom reinforcement of each main beam through a sleeve;

[0021] Step 7. Connection of the secondary beam composite stirrups at the cast-in-place section at the bottom of the secondary beam: hang one end of the hook of the secondary beam composite stirrup corresponding to each first beam composite stirrup on the secondary beam composite stirrup connecting bar, hoop the second beam composite stirrup under the prefabricated secondary beam bottom reinforcement extension section and the main beam pre-embedded secondary beam bottom reinforcement connected as a whole through the sleeve, bend one end of each second beam composite stirrup to form a hook, and hang it on another secondary beam composite stirrup connecting bar, connect the second beam composite stirrup with the first beam composite stirrup to form a complete secondary beam composite stirrup;

[0022] The eighth step is the pouring of the cast-in-place area at the connection of the precast main beam and the cast-in-place area at the bottom of the precast secondary beam, and the formation of the cast-in-place superimposed layer: use non-shrinkage mortar to pour the exposed steel tongue extension section and the cast-in-place area at the connection of the precast main beam, so that the steel tongue connection node of the precast main and secondary beams is formed; use fine stone concrete to pour the cast-in-place area at the bottom of the precast secondary beam, the secondary beam combined stirrups and the precast secondary beam bottom reinforcement extension section connected into a whole by sleeves and the main beam embedded secondary beam bottom reinforcement, so that the bottom connection node of the precast main and secondary beams is formed; use concrete to pour the cast-in-place superimposed layer at the top of the precast main beam and the cast-in-place superimposed layer at the top of the precast secondary beam, so that the top cast-in-place superimposed layer is formed, so that the precast main beam and the precast secondary beam are connected as a whole.

[0023] In the aforementioned eighth step, before pouring the cast-in-place superimposed layer on the top of the precast main beam and the cast-in-place superimposed layer on the top of the precast secondary beam, two or more secondary beam longitudinal force-bearing reinforcement bars are placed parallel to the edges on both sides of the superimposed layer, which penetrate the cast-in-place superimposed layer on the top of the secondary beam and the cast-in-place superimposed layer on the top of the main beam.

[0024] In the first and second steps, the roughness of the rough surface is not less than 4 mm.

[0025] The arrangement of the steel groove and sleeve-connected integral secondary beam bottom reinforcement, the cast-in-place area at the connection of the prefabricated main beam, the cast-in-place area at the bottom of the prefabricated secondary beam, and the cast-in-place superimposed layer of the present invention enables the prefabricated main and secondary beams to be connected as a whole, achieving the strength of the cast-in-place main and secondary beam connection. At the same time, without weakening the integrity of the prefabricated main and secondary beams, the integral secondary beam bottom reinforcement connected by the steel groove and sleeve is used to fix the prefabricated main and secondary beams as a whole, and the connection integrity is strong. The bending moment of the secondary beam can be effectively transmitted to the main beam, reducing the deflection of the secondary beam, and has high practical value and economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the main structure of the embodiment of the present invention in which the prefabricated main beam and the prefabricated secondary beam are connected and cast;

[0027] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure;

[0028] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the prefabricated main beam;

[0029] Figure 4 for Figure 1 3D perspective view of the precast secondary beam;

[0030] Figure 5 for Figure 1 3D perspective view of the prefabricated primary and secondary beam steel tongue and groove rigid composite connection node;

[0031] Figure 6 A schematic diagram of the three-dimensional structure of a steel groove according to an embodiment of the present invention;

[0032] Figure 7 for Figure 1 Schematic diagram of the three-dimensional structure of the cast-in-place area at the bottom of the precast secondary beam;

[0033] Figure 8 It is a schematic diagram of the three-dimensional structure of the secondary beam combined stirrups according to an embodiment of the present invention;

[0034] Fig. 9 This is the main view of the second beam composite stirrups before bending.

[0035] Figures and symbols: 1. Precast main beam; 2. Cast-in-place superimposed layer on top of precast main beam; 3. Precast secondary beam; 4. Cast-in-place superimposed layer on top of precast secondary beam; 5. Steel groove; 6. Embedded section of steel groove; 7. Extended section of steel groove; 8. Steel groove studs; 9. Steel groove pressure plate and anchoring bars; 10. Cast-in-place area at the connection of precast main beam; 11. Cast-in-place area at the bottom of precast secondary beam; 12. Extended section of bottom reinforcement of precast secondary beam; 13. .Pre-embedded secondary beam bottom reinforcement in main beam; 14. Sleeve; 15. Longitudinal force-bearing surface reinforcement of secondary beam; 16. Prefabricated secondary beam bottom reinforcement; 17. Ordinary secondary beam stirrups; 18. Secondary beam combined stirrups; 19. First beam combined stirrups; 20. Second beam combined stirrups; 21. Second beam combined stirrups connecting reinforcement; 22. Reinforcement reinforcement; 23. Main beam bottom reinforcement; 24. Main beam stirrups; 25. Main beam surface reinforcement; 26. Secondary beam waist reinforcement. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0037] like Figures 1 to 5 As shown, this embodiment includes a precast concrete main beam and a precast concrete secondary beam. The precast concrete main beam includes a precast main beam 1, a cast-in-place superimposed layer 2 on the top of the precast main beam, a cast-in-place area 10 at the connection of the precast main beam, a precast main beam embedded steel tongue-and-groove pressure plate and anchor bars 9, and a precast main beam embedded main beam bottom bar 13 at the bottom. The precast concrete secondary beam includes a precast secondary beam 3, a cast-in-place superimposed layer 4 on the top of the precast secondary beam, a precast secondary beam embedded steel tongue 5, and a cast-in-place area 11 at the bottom of the precast secondary beam. The above-mentioned precast main beam 1 is embedded with a steel tongue-and-groove pressure plate and anchor bars 9; the above-mentioned precast secondary beam 3 is embedded with a steel tongue-and-groove 5. As shown in FIG. Figure 3 As shown, there is a gap for placing the steel groove in the cast-in-place area 10 at the connection of the precast main beam, and a steel groove bearing plate and anchoring bars 9 are pre-buried under the gap; a vertically arranged steel groove 5 is pre-buried at the connection end of the precast secondary beam 3. Figure 6As shown, the steel groove 5 includes a steel groove embedded section 6 embedded in the prefabricated secondary beam 3, a steel groove extending section 7 extending out of the prefabricated secondary beam 3, and steel groove bolts 8 vertically welded on both sides of the steel groove 5 body; the steel groove embedded section 6 is fixed and embedded in the prefabricated secondary beam 3 by the steel groove bolts 8 and the reinforcing ribs 22 vertically hooped on the steel groove 5; the steel groove extending section 7 is inserted into the cast-in-place area 10 at the connection of the prefabricated main beam for placing the gap of the steel groove and placed on the steel groove pressure plate and anchor ribs 9, and then cast-in-place with non-shrinkage mortar to form the steel groove connection node of the prefabricated primary and secondary beams. The steel groove 5 mainly plays the role of providing shear bearing capacity, and also facilitates the installation and positioning of the prefabricated primary and secondary beams.

[0038] More than two precast secondary beam bottom reinforcement extension sections 12 extend from the cast-in-place area 11 at the bottom of the precast secondary beam at the bottom of the connection end of the precast secondary beam 3, and the same number of main beam embedded secondary beam bottom reinforcements 13 are embedded and extended from the bottom of the precast main beam 1, and each precast secondary beam bottom reinforcement extension section 12 and each corresponding main beam embedded secondary beam bottom reinforcement 13 are connected through a sleeve 14 located in the cast-in-place area 11 at the bottom of the precast secondary beam, and are filled with fine stone concrete cast-in-place to form the bottom connection node of the precast main and secondary beams.

[0039] like Figures 7 to 9 As shown, the stirrups arranged in the prefabricated secondary beam 3 include ordinary secondary beam stirrups 17 and secondary beam composite stirrups 18; the top of the ordinary secondary beam stirrups 17 extends into the cast-in-place superimposed layer 4 at the top of the secondary beam and is hooped on the longitudinal force-bearing surface reinforcement 15 of the secondary beam, and the remaining part is pre-buried in the prefabricated secondary beam 3 and hooped under the prefabricated secondary beam bottom reinforcement 16 at the bottom; the secondary beam composite stirrups 18 include first beam composite stirrups 19, second beam composite stirrups 20 and secondary beam composite stirrup connecting reinforcement 21; the top of the first beam composite stirrups 19 extends into the cast-in-place superimposed layer 4 at the top of the secondary beam and is hooped on the longitudinal force-bearing surface reinforcement 15 of the secondary beam, and the remaining part is pre-buried in the prefabricated secondary beam 3 and is hooped under the prefabricated secondary beam bottom reinforcement 16 at the bottom; the secondary beam composite stirrups 18 include first beam composite stirrups 19, second beam composite stirrups 20 and secondary beam composite stirrup connecting reinforcement 21; the top of the first beam composite stirrups 19 extends into the cast-in-place superimposed layer 4 at the top of the secondary beam and is hooped On the longitudinal force-bearing reinforcement 15 of the secondary beam, its middle part is embedded in the precast secondary beam 3, and its bottom extends out of the precast secondary beam 3 and extends into the cast-in-place area 11 at the bottom of the precast secondary beam; in the cast-in-place area 11 at the bottom of the precast secondary beam, the bottom of the secondary beam composite stirrup 20 is clamped under the precast secondary beam bottom reinforcement extension section 12 and the main beam embedded secondary beam bottom reinforcement 13 which are connected into a whole through the sleeve 14; each first beam composite stirrup 19 is connected to the corresponding second beam composite stirrup 20 through the secondary beam composite stirrup connecting reinforcement 21 to form a complete secondary beam composite stirrup 18.

[0040] like Figure 1 and Figure 2 As shown, more than two secondary beam longitudinal stress-bearing reinforcements 15 are arranged in the cast-in-place superimposed layer 4 on the top of the prefabricated secondary beam, and each secondary beam longitudinal stress-bearing reinforcement 15 runs through the cast-in-place superimposed layer 4 on the top of the prefabricated secondary beam and the cast-in-place superimposed layer 2 on the top of the prefabricated main beam.

[0041] The contact surface between the precast main beam 1 and the cast-in-place superimposed layer 2 at the top of the precast main beam, the contact surface between the precast secondary beam 3 and the cast-in-place superimposed layer 4 at the top of the precast secondary beam, and the contact surface between the bottom of the precast secondary beam 3 and the cast-in-place area 11 at the bottom of the precast secondary beam are all provided with a rough surface with a roughness of not less than 4 mm; the contact surface between the precast main beam 1 and the cast-in-place area 10 at the connection between the precast main beam and the cast-in-place area 10 at the connection between the precast secondary beam 3 and the precast main beam are all set to smooth surfaces, and the smooth surfaces can enable the non-shrinkage mortar to smoothly fill the cast-in-place areas of the main and secondary beam nodes.

[0042] The setting of the integral secondary beam bottom reinforcement after the steel tongue and sleeve connection, the cast-in-place area at the main beam connection, the cast-in-place area at the bottom of the secondary beam, and the cast-in-place superimposed layer makes the prefabricated main and secondary beams connected as a whole, achieving the strength of the cast-in-place main and secondary beam connection. At the same time, without weakening the integrity of the prefabricated main and secondary beams, the integral secondary beam bottom reinforcement after the steel tongue and sleeve connection is used to fix the prefabricated main and secondary beams as a whole, and the connection integrity is strong.

[0043] The above prefabricated main and secondary beam steel tongue and groove rigid combined connection nodes are connected through the following steps:

[0044] Step 1, prefabricating the main beam 1: at the connection between the prefabricated main beam 1 and the prefabricated secondary beam 3, a prefabricated main beam connection cast-in-place area 10 for placing the steel groove extension section 7 and for connecting the main and secondary beam nodes is reserved, a steel groove bearing plate and anchoring bars 9 are embedded below the notch of the prefabricated main beam connection cast-in-place area 10 for placing the steel groove extension section 7, two or more main beam embedded secondary beam bottom bars 13 are embedded at the bottom of the prefabricated main beam 1, a prefabricated main beam top cast-in-place superimposed layer 2 is reserved at the top of the prefabricated main beam 1, and the contact surface between the prefabricated main beam 1 and the prefabricated main beam top cast-in-place superimposed layer 2 is roughened. In this step, the roughness of the rough surface is not less than 4mm.

[0045] The second step is to prefabricate the secondary beam 3: a vertically arranged steel groove 5 is pre-embedded at the connection end of the prefabricated secondary beam 3, the steel groove pre-embedded section 6 is fixed and pre-embedded in the prefabricated secondary beam 3 by means of a steel groove bolt 8 and a reinforcing bar 22, so that the steel groove protruding section 7 is protruded and exposed outside the prefabricated secondary beam 3, a section of the prefabricated secondary beam bottom cast-in-place area 11 is reserved at the bottom of the connection end of the prefabricated secondary beam 3, more than two prefabricated secondary beam bottom reinforcement protruding sections 12 are extended from the prefabricated secondary beam bottom cast-in-place area 11, ordinary secondary beam stirrups 17 are arranged in the section of the prefabricated secondary beam 3 without the prefabricated secondary beam bottom cast-in-place area 11, and the steel groove protruding section 7 is protruded and exposed outside the prefabricated secondary beam 3. The secondary beam combined stirrups 18 are such that the top of the common secondary beam stirrups 17 extend into the cast-in-place superimposed layer 4 at the top of the secondary beam, the rest of the stirrups are pre-buried in the precast secondary beam 3 and hooped under the precast secondary beam bottom reinforcement 16 at the bottom, the top of the first beam combined stirrups 19 extend into the cast-in-place superimposed layer 4 at the top of the precast secondary beam, the middle part is pre-buried in the precast secondary beam 3, the bottom extends into the cast-in-place area 11 at the bottom of the precast secondary beam, the cast-in-place superimposed layer 4 at the top of the precast secondary beam 3 is reserved, and the contact surface between the precast secondary beam 3 and the cast-in-place superimposed layer 4 at the top of the precast secondary beam and the contact surface between the bottom of the precast secondary beam 3 and the cast-in-place area 11 at the bottom of the precast secondary beam is roughened. In this step, the roughness of the rough surface is not less than 4 mm.

[0046] The order of the first and second steps can be reversed or they can be performed simultaneously.

[0047] The third step is the hoisting of the prefabricated main beam 1: hoisting the prefabricated main beam 1 to the predetermined position.

[0048] The fourth step is to set the secondary beam composite stirrup connecting reinforcement 21: place and fix two secondary beam composite stirrup connecting reinforcements 21 on the first primary beam composite stirrups 19 respectively.

[0049] The fifth step is to hoist the precast secondary beam 3: hoist the precast secondary beam 3 to the predetermined position, and place the steel groove extension section 7 of the precast secondary beam 3 in the gap of the cast-in-place area 10 at the connection of the precast main beam above the steel groove bearing plate and the anchor bar 9.

[0050] The sixth step is to connect the prefabricated secondary beam bottom reinforcement extended section 12 with the main beam embedded secondary beam bottom reinforcement 13: connect each prefabricated secondary beam bottom reinforcement extended section 12 with each corresponding main beam embedded secondary beam bottom reinforcement 13 through the sleeve 14.

[0051] Step 7: Connection of secondary beam composite stirrups 18 at the cast-in-place section at the bottom of the secondary beam: hang one end of the hook of the secondary beam composite stirrups 20 corresponding to each first beam composite stirrup 19 on the secondary beam composite stirrup connecting reinforcement 21, and after the second beam composite stirrups 20 are hooped under the prefabricated secondary beam bottom reinforcement extension section 12 and the main beam pre-embedded secondary beam bottom reinforcement 13 connected as a whole through the sleeve 14, bend the straightened end of each second beam composite stirrup 20 to form a hook (such as Fig. 9As shown), and hung on another secondary beam composite stirrup connecting bar 21, the secondary beam composite stirrup 20 is connected with the primary beam composite stirrup 19 to form a complete secondary beam composite stirrup 18.

[0052] Step 8: Casting of the cast-in-place area 10 at the connection of the precast main beam and the cast-in-place area 11 at the bottom of the precast secondary beam and the formation of the cast-in-place superimposed layer: Use non-shrinkage mortar to cast the exposed steel tongue extension section 7 and the cast-in-place area 10 at the connection of the precast main beam, so that the precast main and secondary beam steel tongue connection node is formed; Use fine stone concrete to cast the cast-in-place area 11 at the bottom of the precast secondary beam, the secondary beam combined stirrups 18 and the precast secondary beam bottom reinforcement extension section 1 connected as a whole by the sleeve 14 2 and the main beam embedded with the secondary beam bottom reinforcement 13, then the precast main and secondary beam bottom connection node is formed; at least two secondary beam longitudinal force-bearing surface reinforcements 15 are placed in parallel on both sides of the edges of the superimposed layer, which penetrate the cast-in-place superimposed layer 4 at the top of the secondary beam and the cast-in-place superimposed layer 2 at the top of the main beam; concrete is used to cast the cast-in-place superimposed layer 2 at the top of the precast main beam and the cast-in-place superimposed layer 4 at the top of the precast secondary beam, then the top cast-in-place superimposed layer is formed, so that the precast main beam 1 and the precast secondary beam 3 are connected as a whole.

[0053] The above description is only a preferred specific implementation method of the present invention, and is not any form of limitation on the steel bar connection of the present invention. Although the present invention has been disclosed as above with a preferred embodiment, the protection scope of the present invention is not limited thereto. Any technician familiar with this profession, without departing from the scope of the technical solution disclosed in the present invention, based on the technical essence of the present invention and using the technical content disclosed above, can easily think of changes or modifications and replacements, which should be covered within the protection scope of this patent.

Claims

1. A prefabricated primary and secondary beam steel tongue and groove rigid combined connection node, comprising a prefabricated concrete primary beam and a prefabricated concrete secondary beam, characterized in that: The precast concrete main beam comprises a precast main beam (1), a cast-in-place superimposed layer (2) at the top of the precast main beam, a cast-in-place area (10) at the connection of the precast main beam, a steel groove bearing plate and anchor bars (9) embedded in the precast main beam (1), and a main beam embedded secondary beam bottom bar (13) embedded in the bottom of the precast main beam (1); the precast concrete secondary beam comprises a precast secondary beam (3), a cast-in-place superimposed layer (4) at the top of the precast secondary beam, a steel groove (5) embedded in the precast secondary beam (3), and a cast-in-place area (11) at the bottom of the precast secondary beam; the connection node between the precast concrete main beam and the precast concrete secondary beam comprises a top cast-in-place superimposed layer, a steel groove connection node, and a bottom connection node; the cast-in-place superimposed layer (2) at the top of the precast main beam and the cast-in-place superimposed layer (4) at the top of the precast secondary beam form a precast main and secondary beam. The top of the beam is cast in situ overlaying layer; in the cast-in-situ area (10) at the connection of the precast main beam, the precast secondary beam (3) embedded steel groove (5) and the precast main beam (1) embedded steel groove bearing plate and anchor bar (9) form the steel groove connection node of the precast main and secondary beams; in the cast-in-situ area (11) at the bottom of the precast secondary beam, the precast secondary beam bottom reinforcement extension section (12), the main beam embedded secondary beam bottom reinforcement (13) and the sleeve (14) form the bottom connection node of the precast main and secondary beams; two or more precast secondary beam bottom reinforcement extension sections (12) are extended from the cast-in-situ area (11) at the bottom of the precast secondary beam at the connection end of the precast secondary beam (3), the bottom of the precast main beam (1) is embedded and extends the same number of main beam embedded secondary beam bottom reinforcement (13), and each precast secondary beam bottom reinforcement extension section (14) is provided. 2) The embedded secondary beam bottom reinforcement (13) of each corresponding main beam is connected through a sleeve (14) located in the cast-in-place area (11) at the bottom of the precast secondary beam, and cast-in-place fine stone concrete is used to form the bottom connection node of the precast primary and secondary beams; the stirrups arranged in the precast secondary beam (3) include ordinary secondary beam stirrups (17) and secondary beam composite stirrups (18); the top of the ordinary secondary beam stirrups (17) extends into the cast-in-place superimposed layer (4) at the top of the precast secondary beam and is hooped on the longitudinal force-bearing surface reinforcement (15) of the secondary beam, and the remaining part is embedded in the precast secondary beam (3) and hooped under the precast secondary beam bottom reinforcement (16) at the bottom; the secondary beam composite stirrups (18) include first beam composite stirrups (19), second beam composite stirrups (20) and secondary beam composite stirrups The top of the first beam composite stirrup (19) extends into the cast-in-place superimposed layer (4) at the top of the precast secondary beam and is hooped on the longitudinal force-bearing surface reinforcement (15) of the secondary beam, the middle part of which is embedded in the precast secondary beam (3), and the bottom of which extends out of the precast secondary beam (3) and extends into the cast-in-place area (11) at the bottom of the precast secondary beam; in the cast-in-place area (11) at the bottom of the precast secondary beam, the bottom of the second beam composite stirrup (20) is hooped under the precast secondary beam bottom reinforcement extension section (12) and the main beam embedded secondary beam bottom reinforcement (13) which are connected into an integral whole through the sleeve (14); each first beam composite stirrup (19) is connected to the corresponding second beam composite stirrup (20) through the secondary beam composite stirrup connecting reinforcement (21) to form a complete secondary beam composite stirrup (18).

2. A prefabricated primary and secondary beam steel tongue and groove rigid combined connection node according to claim 1, characterized in that: A notch is provided in the cast-in-place area (10) at the connection of the prefabricated main beam for placing the steel groove (5), and a steel groove bearing plate and anchoring bars (9) are pre-buried below the notch; a vertically arranged steel groove (5) is pre-buried at the connection end of the prefabricated secondary beam (3), and the steel groove (5) includes a steel groove pre-buried section (6) pre-buried in the prefabricated secondary beam (3), a steel groove protruding section (7) protruding from the prefabricated secondary beam (3), and steel grooves (8) vertically welded on both sides of the main body of the steel groove (5). The steel groove pre-embedded section (6) is fixed and pre-embedded in the prefabricated secondary beam (3) by means of the steel groove bolt (8) and the reinforcing bar (22) vertically hooped on the steel groove (5); the steel groove protruding section (7) is inserted into the cast-in-place area (10) at the connection of the prefabricated main beam for accommodating the notch of the steel groove and is placed on the steel groove bearing plate and the anchor bar (9), and then cast-in-place filling is performed using non-shrinkage mortar to form the steel groove connection node of the prefabricated main and secondary beams.

3. The prefabricated primary and secondary beam steel tongue and groove rigid combined connection node according to claim 1, characterized in that: Two or more secondary beam longitudinal stress-bearing reinforcement bars (15) are arranged in the cast-in-place superimposed layer (4) at the top of the prefabricated secondary beam, and each secondary beam longitudinal stress-bearing reinforcement bar (15) runs through the cast-in-place superimposed layer (4) at the top of the prefabricated secondary beam and the cast-in-place superimposed layer (2) at the top of the prefabricated main beam.

4. The prefabricated primary and secondary beam steel tongue and groove rigid combined connection node according to claim 1, characterized in that: The contact surface between the precast main beam (1) and the cast-in-place superimposed layer (2) at the top of the precast main beam, the contact surface between the precast secondary beam (3) and the cast-in-place superimposed layer (4) at the top of the precast secondary beam, and the contact surface between the bottom of the precast secondary beam (3) and the cast-in-place area (11) at the bottom of the precast secondary beam are all provided with a rough surface with a roughness of not less than 4 mm; the contact surface between the precast main beam (1) and the cast-in-place area (10) at the connection between the precast main beam and the cast-in-place area (10) at the connection between the precast secondary beam (3) and the precast main beam are all provided with a smooth surface.

5. A connection method for prefabricated primary and secondary beam steel tongue and groove rigid combined connection nodes, characterized in that: The following steps are involved: The first step is to prefabricate the main beam (1): at the connection between the prefabricated main beam (1) and the prefabricated secondary beam (3), a prefabricated main beam connection cast-in-place area (10) for placing the steel groove extension section (7) and for connecting the main and secondary beam nodes is reserved; a steel groove bearing plate and anchoring bars (9) are embedded below the notch of the prefabricated main beam connection cast-in-place area (10) for placing the steel groove extension section (7); two or more main beam embedded secondary beam bottom bars (13) are embedded at the bottom of the prefabricated main beam (1); a prefabricated main beam top cast-in-place superimposed layer (2) is reserved at the top of the prefabricated main beam (1); and a rough surface treatment is performed on the contact surface between the prefabricated main beam (1) and the prefabricated main beam top cast-in-place superimposed layer (2); The second step is to prefabricate the secondary beam (3): a steel groove (5) vertically arranged is embedded at the connection end of the prefabricated secondary beam (3); the embedded steel groove section (6) is fixed and embedded in the prefabricated secondary beam (3) by means of steel groove bolts (8) and reinforcing bars (22), so that the steel groove protruding section (7) protrudes out of the prefabricated secondary beam (3); a section of the prefabricated secondary beam bottom cast-in-place area (11) is reserved at the bottom of the connection end of the prefabricated secondary beam (3); two or more prefabricated secondary beam bottom reinforcement protruding sections (12) are extended from the prefabricated secondary beam bottom cast-in-place area (11); ordinary secondary beam stirrups (17) are provided in the section of the prefabricated secondary beam (3) without the prefabricated secondary beam bottom cast-in-place area (11); and the steel groove protruding sections (7) are provided in the section of the prefabricated secondary beam (3) with the prefabricated secondary beam bottom cast-in-place area (11). Secondary beam composite stirrups (18) are arranged in the middle, so that the top of the common secondary beam stirrups (17) extends into the cast-in-place superimposed layer (4) at the top of the secondary beam, and the remaining part is pre-buried in the precast secondary beam (3) and hooped under the precast secondary beam bottom reinforcement (16) at the bottom, so that the top of the first beam composite stirrups (19) extends into the cast-in-place superimposed layer (4) at the top of the precast secondary beam, the middle part is pre-buried in the precast secondary beam (3), and the bottom extends into the cast-in-place area (11) at the bottom of the precast secondary beam, the cast-in-place superimposed layer (4) at the top of the precast secondary beam (3) is reserved, and the contact surface between the precast secondary beam (3) and the cast-in-place superimposed layer (4) at the top of the precast secondary beam and the contact surface between the bottom of the precast secondary beam (3) and the cast-in-place area (11) at the bottom of the precast secondary beam are roughened; The third step is to hoist the prefabricated main beam (1): hoist the prefabricated main beam (1) to a predetermined position; Step 4: Setting of secondary beam composite stirrup connecting bars (21): placing and fixing two secondary beam composite stirrup connecting bars (21) on the primary beam composite stirrups (19) respectively; Step 5, hoisting the prefabricated secondary beam (3): hoisting the prefabricated secondary beam (3) to a predetermined position, placing the steel groove extension section (7) of the prefabricated secondary beam (3) in the gap of the cast-in-place area (10) at the connection of the prefabricated main beam above the steel groove bearing plate and the anchor bar (9); Step 6: connecting the prefabricated secondary beam bottom reinforcement extension section (12) with the main beam pre-embedded secondary beam bottom reinforcement (13): connecting each prefabricated secondary beam bottom reinforcement extension section (12) with each corresponding main beam pre-embedded secondary beam bottom reinforcement (13) through a sleeve (14); Step 7, connecting the secondary beam composite stirrups (18) at the cast-in-place section at the bottom of the secondary beam: hang one end of the hook of the secondary beam composite stirrup (20) corresponding to each first beam composite stirrup (19) on the secondary beam composite stirrup connecting bar (21), hoop the second beam composite stirrup (20) under the prefabricated secondary beam bottom reinforcement extension section (12) and the main beam pre-embedded secondary beam bottom reinforcement (13) connected as a whole by the sleeve (14), bend one end of each second beam composite stirrup (20) to form a hook, and hang it on another secondary beam composite stirrup connecting bar (21), connect the second beam composite stirrup (20) with the first beam composite stirrup (19) to form a complete secondary beam composite stirrup (18); Step 8: Casting of the cast-in-place area (10) at the connection of the precast main beam and the cast-in-place area (11) at the bottom of the precast secondary beam and the formation of the cast-in-place superimposed layer: Use non-shrinkage mortar to cast the exposed steel tongue extension section (7) and the cast-in-place area (10) at the connection of the precast main beam, so that the precast main and secondary beam steel tongue connection node is formed; Use fine stone concrete to cast the cast-in-place area (11) at the bottom of the precast secondary beam, the secondary beam composite stirrups (18) and the precast secondary beam bottom reinforcement extension section (12) and the main beam embedded secondary beam bottom reinforcement (13) connected as a whole by the sleeve (14), so that the precast main and secondary beam bottom connection node is formed; Use concrete to cast the cast-in-place superimposed layer (2) at the top of the precast main beam and the cast-in-place superimposed layer (4) at the top of the precast secondary beam, so that the top cast-in-place superimposed layer is formed, so that the precast main beam (1) and the precast secondary beam (3) are connected as a whole.

6. The method for connecting a prefabricated primary and secondary beam steel tongue-and-groove rigid combined connection node according to claim 5, characterized in that: In the eighth step, before pouring the cast-in-place superimposed layer (2) at the top of the precast main beam and the cast-in-place superimposed layer (4) at the top of the precast secondary beam, two or more secondary beam longitudinal force-bearing surface reinforcements (15) are placed in parallel on both sides of the superimposed layer edges, penetrating the cast-in-place superimposed layer (4) at the top of the secondary beam and the cast-in-place superimposed layer (2) at the top of the main beam.

7. The method for connecting a prefabricated primary and secondary beam steel tongue-and-groove rigid combined connection node according to claim 5, characterized in that: In the first step and the second step, the roughness of the rough surface is not less than 4 mm.

Images