Steel box beam column reinforcing precast concrete connecting device and using method thereof

Abstract

The invention discloses a steel box beam column reinforcing precast concrete connecting device and a using method thereof. The beam column comprises a prefabricated column and a prefabricated beam, the connecting device comprises a steel box component and a cast-in-place beam component, the prefabricated column comprises a first concrete column and a second concrete column which are arranged in the length direction in a spaced mode, and the first concrete column and the second concrete column are connected through column steel bars. The steel box component is arranged in the interval space between the first concrete column and the second concrete column and connects the first concrete column and the second concrete column into a whole. The cast-in-place beam components are arranged at the tops of the prefabricated beams in an aligned mode, and the prefabricated beams and the ends, close to the prefabricated columns, of the cast-in-place beam components are fixed to the steel box components through plastic hinge connecting assemblies and anchoring connecting assemblies correspondingly. According to the invention, the installation is easy, the construction difficulty can be reduced, the construction process is simplified, and high strength, bearing capacity and better shock resistance are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of precast concrete beam-column connection, in particular to a steel box beam-column reinforced precast concrete connection device and a use method thereof. Background Art

[0002] With the development of building industrialization, prefabricated buildings have become an important direction of the modern construction industry. Prefabricated concrete beam-column connection technology has attracted widespread attention because it can significantly improve construction efficiency, reduce on-site wet operations, and increase the proportion of factory production. Especially under the demand for energy conservation and environmental protection, prefabricated component technology has become an important development trend in the construction field.

[0003] At present, precast concrete beam-column connection technology is widely used in engineering, and has gradually realized the transition from traditional construction to modern prefabricated buildings. In the past, the connection methods used for precast reinforced concrete structures were divided into two types: "dry type" and "semi-integral type". In practical applications, there are the following shortcomings:

[0004] 1) Although the installation procedure is simple, the integrity of the prefabricated component connection is poor, especially the "dry" connection method, which makes it difficult to achieve the continuity of traditional cast-in-place structures.

[0005] 2) Under the action of strong earthquakes, the forces on the connection nodes are complex and prone to local damage, and the seismic performance is often inferior to that of cast-in-place structures.

[0006] 3) “Semi-integral” connections require longer pouring times and scaffolding at the construction site, and result in blockage of reinforcement at the beam-column connection.

[0007] 4) The design and construction process of precast concrete beam-column connections is relatively complex, especially in super-high-rise buildings and special structures. The construction requirements are high, workers need to receive special training, and need to have precise operation and control capabilities.

[0008] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0009] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the present invention proposes a precast concrete connection device for reinforcing a steel box beam column and a method for using the same, which is not only easy to install, can reduce the construction difficulty, and simplify the construction process, but also has higher strength, bearing capacity and better earthquake resistance.

[0010] According to a precast concrete connection device for reinforcing a steel box beam column of the present invention, the beam column comprises a precast column and a precast beam, and the connection device comprises:

[0011] The steel box component, the prefabricated column comprises a first section concrete column and a second section concrete column arranged at intervals along the length direction, the first section concrete column and the second section concrete column are connected by column reinforcement, and the steel box component is arranged in the interval space between the first section concrete column and the second section concrete column and connects the two into one;

[0012] The cast-in-place beam component is arranged on the top of the precast beam in an aligned manner, and the precast beam and the end of the cast-in-place beam component close to the precast column are fixed together with the steel box component through a plastic hinge connection component and an anchor connection component respectively.

[0013] According to some embodiments of the present invention, the steel box component includes a steel plate box body having upper and lower through ports, the end face dimensions of the upper and lower through ports are consistent with the cross-sectional dimensions of the first section concrete column and the second section concrete column, and the column reinforcement is welded and fixed to the steel plate box body.

[0014] According to some embodiments of the present invention, a reinforcing steel plate is further provided inside the steel plate box, and the reinforcing steel plate is configured to be able to divide the steel plate box into a plurality of longitudinally extending cavities.

[0015] According to some embodiments of the present invention, a cast-in-place beam component includes a row of U-shaped steel bars fixedly connected to the top of a precast beam and a concrete beam integrally cast with the U-shaped steel bars.

[0016] According to some embodiments of the present invention, the plastic hinge connection assembly includes a steel box angle and a steel box seat plate fixedly arranged on the outer side of the steel box member, and a beam side plate and a beam bottom plate fixedly arranged on the end of the prefabricated beam, and the beam side plate and the beam bottom plate are respectively connected to the steel box angle and the steel box seat plate from the side and the bottom.

[0017] According to some embodiments of the present invention, two steel box angles are symmetrically welded and fixed to the upper two sides of the steel plate box body facing the prefabricated beam, and two steel box seat plates are fixed to the lower two sides of the steel plate box body facing the prefabricated beam by means of steel box head nails and welding;

[0018] Two beam side plates with first beam head nails are symmetrically fixed to the end side surfaces of the precast beam, and a beam bottom plate with second beam head nails is fixed to the end bottom surface of the precast beam; the beam side plates and the beam bottom plate are welded and fixed to the steel box angle steel and the steel box seat plate respectively.

[0019] According to some embodiments of the present invention, the anchoring connection assembly includes anchoring holes, anchoring bars, anchoring pads and anchoring nuts. The same number of anchoring holes as the anchoring bars are reserved inside the prefabricated column and are arranged throughout. At least two anchoring bars respectively penetrate the interior of the U-shaped steel bar and the anchoring holes. The anchoring bars have threaded ends that pass through the anchoring holes and are fixed to the prefabricated column through the anchoring pads and anchoring nuts.

[0020] A method for using the above-mentioned steel box beam column reinforcement precast concrete connection device according to the present invention comprises the following steps:

[0021] Making prefabricated columns and forming a combined structure of the first section concrete column, the second section concrete column and column reinforcement, while reserving anchor holes;

[0022] Make precast beams, and set U-shaped steel bars, beam side plates and beam bottom plates at the top and ends of the precast beams;

[0023] Fabrication and installation of steel box components: setting steel box angle steel and steel box seat plate on the steel box components, and assembling the prefabricated beams with the steel box components through the beam side plates and beam bottom plates;

[0024] Production and installation of cast-in-place beam components: pass the anchor bars through the U-shaped steel bars and anchor holes, and fix the threaded ends that pass through the anchor holes to the precast columns through anchor pads and anchor nuts; pour concrete on site at the anchor bars and U-shaped steel bars to complete the production of the cast-in-place beam components and their assembly with the precast beams.

[0025] According to the present invention, a precast concrete connection device for reinforcing a steel box beam column and a method for using the same, on the one hand, an integrally connected steel box component is provided based on the precast column, and the precast beam and the steel box component are assembled into one by using a plastic hinge connection assembly; on the other hand, an integrally connected cast-in-place beam component is provided based on the precast beam, and the cast-in-place beam component and the precast column are assembled into one by using an anchor connection assembly. In this way, the precast concrete beam-column connection is simply and effectively reinforced by using the steel box component and the cast-in-place beam component as a link, and by means of the anchor connection assembly and the plastic hinge connection assembly. It is not only easy to install, can reduce the difficulty of construction, and simplify the construction process, but also has higher strength, bearing capacity and better earthquake resistance, and is particularly suitable for large-span, heavy-load building structures.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of some embodiments of the steel box beam column reinforcement precast concrete connection device of the present invention.

[0029] Figure 2 Schematic diagram of the exploded structure of some embodiments of the precast concrete connection device for reinforcing the steel box beam column of the present invention.

[0030] Figure 3 It is a schematic diagram of the main structure of some embodiments of the steel box beam column reinforcement precast concrete connection device of the present invention.

[0031] Figure 4 It is a rear structural schematic diagram of some embodiments of the steel box beam column reinforcement precast concrete connection device of the present invention, which is presented in perspective form.

[0032] Figure 5 It is a side view structural schematic diagram of some embodiments of the steel box beam column reinforcement precast concrete connection device of the present invention.

[0033] Figure 6 It is a schematic diagram of the top view of some embodiments of the precast concrete connection device for reinforcing the steel box beam column of the present invention.

[0034] Figure 7 The present invention is a schematic flow chart of some embodiments of the method for using the precast concrete connection device for reinforcing a steel box beam column.

[0035] Meaning of reference numerals in the figure:

[0036] 100-connection device;

[0037] 110- steel box member; 1101- steel plate box; 1102- reinforcement steel plate;

[0038] 120-cast-in-place beam member; 1201-U-shaped steel bar; 1202-concrete beam;

[0039] 130- plastic hinge connection assembly; 1301- steel box angle steel; 1301-1- steel box head nail; 1302- steel box seat plate; 1303- beam side plate; 1303-1- first beam head nail; 1304- beam bottom plate; 1304-1- second beam head nail;

[0040] 140-anchor connection assembly; 1401-anchor hole; 1402-anchor rib; 1403-anchor pad; 1404-anchor nut;

[0041] 200-precast columns;

[0042] 210-1st section concrete column;

[0043] 220-Second Section Concrete Column;

[0044] 300-Precast beams. DETAILED DESCRIPTION

[0045] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0046] The common connection methods of prefabricated reinforced concrete structures in related technologies are "dry type" and "semi-integral type". Although the installation procedure is simple, there are many problems:

[0047] The integrity of prefabricated component connections is poor, especially the "dry" connection method, which makes it difficult to achieve the continuity of traditional cast-in-place structures; under strong earthquakes, the forces on the connection nodes are complex and prone to local damage, and the seismic performance is often not as good as that of cast-in-place structures; "semi-integral" connections require a long pouring time and scaffolding on the construction site, and cause blockage of steel bars at the beam-column connection; the design and construction process of precast concrete beam-column connections are relatively complex, especially in super-high-rise buildings and special structures, where construction requirements are high, workers need to undergo special training, and need to have precise operation and control capabilities.

[0048] In view of this, an embodiment of the present invention application aims to provide a steel box beam column reinforced precast concrete connection device and a method of using the same, by setting a steel box component 110 and a cast-in-place beam component 120, and utilizing a plastic hinge connection assembly 130 and an anchor connection assembly 140 to assemble them into an integrated structure.

[0049] First, the selected beam-column joints are prefabricated and cast-in-place. The prefabricated beam joints are designed at a ratio of 2 / 3 (that is, various possible load conditions are required to be taken into account during the design process to ensure that the structure can withstand at least two-thirds of the expected load, thereby ensuring the safety and stability of the structure.), and the cast-in-place beam joints are designed at a ratio of 1 / 3, so that the connection device 100 of the embodiment of the present invention not only has suitable beam-column connection conditions, but also the flexible design of the 1 / 3 cast-in-place part is more flexible and better connected with the floor slab. The cast-in-place part can ensure the overall connectivity of the beam-slab, reduce quality problems such as cracks and leakage caused by discontinuity, and reflect suitable beam-slab connection conditions.

[0050] Secondly, the high strength of the steel structure is combined with the good compressive resistance of concrete, so that a large load can be carried within a relatively small cross-sectional size, further making the connection device 100 of the embodiment of the present invention have a higher strength and bearing capacity, and can effectively improve the stress performance of the connection part;

[0051] Furthermore, the connection device 100 of the embodiment of the present invention can utilize the limiting effect of the steel box 110 on the prefabricated joints to reduce concrete damage, can cope with larger vertical and horizontal loads, and is particularly suitable for large-span, heavy-load building structures.

[0052] Finally, the connection device 100 of the embodiment of the present invention can utilize the anchor connection assembly 140 and the plastic hinge connection assembly 130 to improve the integrity of the structural node, reduce stress concentration at the beam-column connection, and enable the entire beam-column connection node structure to exhibit better seismic resistance during an earthquake.

[0053] Based on the above, the above problems are solved simply and effectively.

[0054] According to the following Figure 1-Figure 7 A steel box beam column reinforcement precast concrete connection device 100 and a method of using the same are described in detail.

[0055] Please refer to Figure 1-6 An embodiment of the present invention provides a steel box beam column reinforced precast concrete connection device 100, which includes a steel box component 110 and a cast-in-place beam component 120.

[0056] In an embodiment of the present invention, the beam column includes a prefabricated column 200 and a prefabricated beam 300. The prefabricated column 200 includes a first section concrete column 210 and a second section concrete column 220 which are spaced apart along the length direction. The first section concrete column 210 and the second section concrete column 220 are connected by column reinforcement. The steel box component 110 is disposed in the space between the first section concrete column 210 and the second section concrete column 220 and connects the two into one.

[0057] The figure does not show the column reinforcement, but the installation space of the column reinforcement is shown on the first section concrete column 210 and the second section concrete column 220. Therefore, it is not difficult to understand that the column reinforcement sequentially passes through the first section concrete column 210, the interval space and the second section concrete column 220, and the steel plate box 1101 is connected to the column reinforcement in the interval space by welding.

[0058] In an embodiment of the present invention, the cast-in-place beam component 120 is arranged on the top of the precast beam 300 in an aligned manner, and the precast beam 300 and the end of the cast-in-place beam component 120 close to the precast column 200 are fixed together with the steel box component 110 by a plastic hinge connection component 130 and an anchor connection component 140 respectively.

[0059] The design of the plastic hinge connection assembly 130 can increase the compressive strength of the precast beam 300 and the axial force of the precast column 200 at the connection node. The anchor connection assembly 140 can improve the connection stability of the precast column 200 and the precast beam 300.

[0060] In some implementations of the embodiments of the present invention, the steel box component 110 includes a steel plate box body 1101 having upper and lower through ports, the end face dimensions of the upper and lower through ports are consistent with the cross-sectional dimensions of the first section concrete column 210 and the second section concrete column 220, and the column reinforcement is welded and fixed to the steel plate box body 1101.

[0061] In some implementations of the embodiments of the present invention, a reinforcing steel plate 1102 is further provided inside the steel plate box 1101, and the reinforcing steel plate 1102 is configured to be able to separate the steel plate box 1101 into a plurality of cavities extending longitudinally.

[0062] The reinforcement steel plate 1102 is mainly used to optimize the structural strength of the steel plate box 1101, avoid deformation due to stress, and avoid plane bending.

[0063] In some implementations of the embodiments of the present invention, the cast-in-place beam component 120 includes a row of U-shaped steel bars 1201 fixedly connected to the top of the precast beam 300 and a concrete beam 1202 cast integrally with the U-shaped steel bars 1201 .

[0064] In a specific implementation, a row of U-shaped steel bars 1201 may be a plurality of U-shaped steel bars 1201 arranged at equal intervals parallel to the length direction of the precast beam 300. Furthermore, the steel bar spacing may be set to 100 mm.

[0065] In some embodiments of the embodiments of the present invention, the plastic hinge connection assembly 130 includes a steel box angle 1301 and a steel box seat plate 1302 fixedly arranged on the outer side of the steel box member 110, and a beam side plate 1303 and a beam bottom plate 1304 fixedly arranged at the end of the prefabricated beam 300, and the beam side plate 1303 and the beam bottom plate 1304 are respectively connected to the steel box angle 1301 and the steel box seat plate 1302 from the side and the bottom.

[0066] The beam side plate 1303 and the beam bottom plate 1304 limit the concrete at the beam end of the precast beam 300, and then form a plastic hinge structure by connecting with the column model of the precast beam 300 with the help of the steel box angle 1301 and the steel box seat plate 1302, thereby enhancing the compressive strength of the concrete at the beam end and the axial force of the concrete column.

[0067] In some implementations of the embodiments of the present invention, two steel box angles 1301 are symmetrically welded and fixed to the upper two sides of the steel plate box 1101 facing the precast beam 300, and two steel box seat plates 1302 are fixed to the lower two sides of the steel plate box 1101 facing the precast beam 300 by means of steel box head nails 1301-1 and welding;

[0068] Two beam side plates 1303 with first beam head nails 1303-1 are symmetrically fixed to the end side surfaces of the precast beam 300, and a beam bottom plate 1304 with second beam head nails 1304-1 is fixed to the end bottom surface of the precast beam 300; the beam side plates 1303 and the beam bottom plate 1304 are welded and fixed to the steel box angle steel 1301 and the steel box seat plate 1302, respectively.

[0069] In some embodiments of the embodiments of the present invention, the anchoring connection assembly 140 includes an anchoring hole 1401, an anchoring rib 1402, an anchoring pad 1403 and an anchoring nut 1404. The same number of anchoring holes 1401 as the anchoring rib 1402 is reserved inside the prefabricated column 200 and is arranged throughout. At least two anchoring ribs 1402 respectively penetrate the interior of the U-shaped steel bar 1201 and the anchoring hole 1401. The anchoring rib 1402 has a threaded end that passes through the anchoring hole 1401 and is fixed to the prefabricated column 200 through the anchoring pad 1403 and the anchoring nut 1404.

[0070] Please refer to Figure 7 The method for using the above-mentioned steel box beam column reinforcement precast concrete connection device 100 provided in an embodiment of the present invention comprises the following steps:

[0071] S100, manufacturing prefabricated columns 200.

[0072] By means of binding steel bars and pouring concrete, a combined structure of the first section concrete column 210, the second section concrete column 220 and the column steel bars is prepared and formed in advance, and an anchor hole 1401 is reserved at the same time;

[0073] S200, manufacturing prefabricated beams 300.

[0074] The method of tying steel bars and pouring concrete is adopted, and U-shaped steel bars 1201, beam side plates 1303 and beam bottom plates 1304 are respectively arranged at the top and ends thereof;

[0075] S300 , manufacturing and installing the steel box component 110 .

[0076] A steel box angle steel 1301 and a steel box seat plate 1302 are arranged on the steel box member 110, and the prefabricated beam 300 is assembled with the steel box member 110 through the beam side plate 1303 and the beam bottom plate 1304;

[0077] S400: fabricate and install cast-in-place beam components 120.

[0078] The anchor bar 1402 is passed through the U-shaped steel bar 1201 and the anchor hole 1401, and the threaded end passing through the anchor hole 1401 is fixed to the precast column 200 through the anchor pad 1403 and the anchor nut 1404; concrete is poured on site at the anchor bar 1402 and the U-shaped steel bar 1201 to complete the production of the cast-in-place beam component 120 and the assembly with the precast beam 300.

[0079] According to the steel box beam column reinforcement precast concrete connection device 100 and its use method provided in the embodiment of the present invention, a model is made and the effect test is carried out. The details are as follows:

[0080] By using Buckingham π theorem, the geometric similarity ratio with the actual project is determined, the test scale size is determined, and the scaled model of the connection device 100 of the embodiment of the present invention and the existing ordinary prefabricated beam 300 column connection structure is produced, and the difficulty of model production and the complexity of the construction process are recorded. The bearing capacity of the two connection structures under positive bending moment is analyzed and compared. Then, the test process is numerically analyzed by finite element software, and the accuracy and reliability of the numerical value are verified by numerical and experimental comparative analysis. Finally, the earthquake motion simulation is carried out by numerical method to compare and analyze the influence of earthquake motion on different connection methods and the influence on the degree of structural damage.

[0081] After testing, the method of using the connection device 100 of the embodiment of the present invention has a simple assembly process for connecting with other traditional prefabricated beams 300. In addition, no scaffolding and formwork are required for the cast-in-place part of the beam.

[0082] According to tests, the embodiment of the present invention uses steel box components 110 and cast-in-place beam components 120 to reinforce the connection between the precast concrete beam 1202 and the column, and the constraint effect on the upper part of the proposed precast beam 300 increases the bearing capacity of the beam-column connection node structure under the action of positive moment by at least 7%.

[0083] After testing, it was found that the beam-column connection in the embodiment of the present invention improves the overall ductility of the beam-column connection node structure by setting a plastic hinge connection component 130 composed of a steel box angle 1301, a steel box seat plate 1302, a beam bottom plate 1304 and a beam side plate 1303, which is more conducive to structural earthquake resistance.

[0084] According to the test, the concrete damage degree at the connection between the beam and the column is small due to the limiting effect of the connection between the steel box member 110 and the prefabricated column 200 on the planned prefabricated joint.

[0085] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0086] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0087] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0088] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A precast concrete connection device for reinforcing a steel box beam column, wherein the beam column comprises a precast column and a precast beam, characterized in that: The connecting device comprises: The prefabricated column comprises a first section concrete column and a second section concrete column arranged at intervals along the length direction, the first section concrete column and the second section concrete column are connected by column reinforcement, and the steel box component is arranged in the interval between the first section concrete column and the second section concrete column and connects the two into one; A cast-in-place beam component is arranged on the top of the precast beam in an aligned manner, and the precast beam and one end of the cast-in-place beam component close to the precast column are fixed together with the steel box component through a plastic hinge connection component and an anchor connection component respectively.

2. The precast concrete connection device for reinforcing steel box beam columns according to claim 1 is characterized in that: The steel box component includes a steel plate box body with upper and lower through ports, the end surface dimensions of the upper and lower through ports are consistent with the cross-sectional dimensions of the first section concrete column and the second section concrete column, and the column reinforcement is welded and fixed to the steel plate box body.

3. The precast concrete connection device for reinforcing steel box beam columns according to claim 2 is characterized in that: A reinforcing steel plate is further provided inside the steel plate box, and the reinforcing steel plate is configured to be able to divide the steel plate box into a plurality of cavities extending longitudinally.

4. The precast concrete connection device for reinforcing steel box beam columns according to claim 3 is characterized in that: The cast-in-place beam component comprises a row of U-shaped steel bars fixedly connected to the top of the prefabricated beam and a concrete beam integrally cast with the U-shaped steel bars.

5. The precast concrete connection device for reinforcing steel box beam columns according to claim 4 is characterized in that: The plastic hinge connection assembly includes a steel box angle and a steel box seat plate fixedly arranged on the outer side of the steel box member, and a beam side plate and a beam bottom plate fixedly arranged on the end of the prefabricated beam. The beam side plate and the beam bottom plate are respectively connected to the steel box angle and the steel box seat plate from the side and the bottom.

6. The precast concrete connection device for reinforcing steel box beam columns according to claim 5, characterized in that: The two steel box angles are symmetrically welded and fixed to the upper two sides of the steel plate box body facing the prefabricated beam, and the two steel box seat plates are fixed to the lower two sides of the steel plate box body facing the prefabricated beam by means of steel box head nails and welding; The two beam side plates with first beam head nails are symmetrically fixed to the end side surfaces of the precast beam, and a beam bottom plate with second beam head nails is fixed to the end bottom surface of the precast beam; the beam side plates and the beam bottom plate are respectively welded and fixed to the steel box angle steel and the steel box seat plate.

7. The precast concrete connection device for reinforcing steel box beam columns according to claim 6, characterized in that: The anchor connection assembly includes anchor holes, anchor bars, anchor pads and anchor nuts. The anchor holes, which are the same in number as the anchor bars, are reserved inside the prefabricated column and are arranged through the column. At least two of the anchor bars respectively penetrate the interior of the U-shaped steel bar and the anchor holes. The anchor bars have threaded ends that pass through the anchor holes and are fixed to the prefabricated column through anchor pads and anchor nuts.

8. A method for using the precast concrete connection device for reinforcing a steel box beam column as claimed in claim 7, characterized in that: The following steps are involved: Making prefabricated columns and forming a combined structure of the first section concrete column, the second section concrete column and column reinforcement, while reserving anchor holes; Make precast beams, and set U-shaped steel bars, beam side plates and beam bottom plates at the top and ends of the precast beams; Fabrication and installation of steel box components: setting steel box angle steel and steel box seat plate on the steel box components, and assembling the prefabricated beams with the steel box components through the beam side plates and beam bottom plates; Production and installation of cast-in-place beam components: pass the anchor bars through the U-shaped steel bars and anchor holes, and fix the threaded ends that pass through the anchor holes to the precast columns through anchor pads and anchor nuts; pour concrete on site at the anchor bars and U-shaped steel bars to complete the production of the cast-in-place beam components and their assembly with the precast beams.

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