A partially prefabricated cavity shear wall hybrid structure, construction method and application thereof

Abstract

This invention discloses a partially precast cavity shear wall hybrid structure, its construction method, and its application. It includes precast concrete shear wall panels, each precast from precast concrete. Along the height direction, I-beams are vertically inserted through both ends of the precast concrete shear wall panels, and two square steel tubes are inserted through the middle of the panels. Cavities one and two are arranged within the precast concrete shear wall panels. The I-beams are placed in cavity one along the height direction, and the square steel tubes are placed in cavity two along the height direction. Cavity one is filled with cast-in-place concrete, and the square steel tubes are filled with grout. This invention greatly simplifies the rebar splicing process and enhances the horizontal connection effect.

Description

Technical Field

[0001] This invention relates to the field of shear wall structure technology, specifically to a partially prefabricated cavity shear wall hybrid structure, its construction method, and its application. Background Technology

[0002] Steel-concrete composite shear walls possess excellent shear and seismic resistance, making them widely used in high-rise and super high-rise buildings in my country. However, their complex structure leads to difficulties in on-site construction, long construction periods, and significant susceptibility to environmental influences. Prefabricated structures, on the other hand, have components designed and manufactured in advance in a factory, then transported to the site for installation. This offers advantages such as faster construction speed, higher economic efficiency, and less environmental impact, thus filling the gaps in cast-in-place steel-concrete composite shear walls. However, fully prefabricated steel-concrete composite structures suffer from complex connections, making it difficult to guarantee the reliability of joint areas and the overall structural integrity. Furthermore, their heavy weight results in high transportation and hoisting costs.

[0003] A precast steel-concrete composite connection for shear walls, disclosed in CN112064824A, involves post-casting concrete at the lapped reinforcement joints, but this connection method lacks overall integrity. Summary of the Invention

[0004] In order to overcome the problems existing in the prior art, the purpose of this invention is to provide a partially prefabricated cavity shear wall hybrid structure, its construction method, and its application;

[0005] The first objective of this invention is to significantly improve construction speed and ensure the overall integrity of the structure by partially prefabricating the reinforced concrete of the shear wall and then fitting the prefabricated shear wall panels onto pre-installed steel sections during on-site construction, followed by pouring concrete into the cavities. Furthermore, replacing the intermediate vertical reinforcing bars with square steel pipes greatly simplifies the rebar splicing process.

[0006] The second objective of this invention is to weld the corrugated web box-shaped connector to the transversely distributed reinforcing bars during the prefabrication of the wall panels, embed them in the prefabricated steel-concrete wall panels, and design three different connection methods. The horizontal connector steel plate and the steel section are equipped with studs to further enhance the horizontal connection function.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A partially precast cavity shear wall hybrid structure includes precast concrete shear wall panels, which are precast from precast concrete. Along the height direction, I-beams are provided at both ends of the precast concrete shear wall panels, penetrating vertically through the upper and lower ends of the precast concrete shear wall panels. Two square steel pipes are provided through the middle of the precast concrete shear wall panels. Cavities one and two are arranged in the precast concrete shear wall panels.

[0009] An I-beam is placed in cavity one along the height direction, and a square steel pipe is placed in cavity two along the height direction. Concrete is poured into cavity one, and grouting material is filled into the square steel pipe.

[0010] The first cavity is vertically set and penetrates the precast concrete shear wall panel to form a through hole at the top and bottom. During construction, an I-beam is inserted and then cast-in-place concrete is poured. The second cavity is not set through and is only arranged at the bottom of the precast concrete shear wall panel. During construction, a square steel pipe is inserted and then grout is injected.

[0011] The opening of cavity one is larger than the corresponding position of I-beam one, and the opening of cavity two is larger than the corresponding position of square steel tube, so as to facilitate the positioning of I-beam one and square steel tube and prevent I-beam one and square steel tube from being unable to be inserted into the cavity due to factory production errors.

[0012] The square steel pipe is embedded in the upper part of the middle section of the precast concrete wall panel in the factory, and the I-beam is installed on the construction site after it is made; the I-beam is made of honeycomb steel.

[0013] The cavity is provided with box-shaped steel pipes at both ends. The box-shaped steel pipes have a constricted structure. The four corners of the box-shaped steel pipes are welded with longitudinal ribs, and the longitudinal ribs are fixed with stirrups.

[0014] The cavity two includes a box-shaped steel pipe with a constricted opening. The bottom of the box-shaped steel pipe with the constricted opening is sealed. The box-shaped steel pipe with the constricted opening is located in the middle part. A grouting hole is reserved on the box-shaped steel pipe with the constricted opening. A square steel pipe is inserted into the box-shaped steel pipe with the constricted opening. The grouting hole is used for grouting.

[0015] The box-type steel pipe one and box-type steel pipe two are rectangular or circular in shape;

[0016] The first and second box-shaped steel pipes have rectangular cross sections. The constricted section is made of two rectangular steel plates and two trapezoidal steel plates of the same size welded together. The main body is a section of box-shaped steel pipe, which is made of welded steel plates.

[0017] The middle part of the cavity is made of foam board or square steel pipe.

[0018] When a partially precast cavity shear wall hybrid structure is applied, and the required shear wall in the horizontal direction is relatively long, a horizontal connection system is needed to connect the partially precast cavity shear walls. The horizontal connection system includes three types of horizontal connection methods: straight, L-shaped, and T-shaped.

[0019] When the required shear wall in the straight direction is relatively long and the span of the edge restraint member is large, a straight-line shape is adopted;

[0020] When shear walls are used at corners, an L-shape is adopted;

[0021] When shear walls are used with T-shaped connections, a T-shape should be adopted;

[0022] When using a straight connection, the cavity at one end of the shear wall is replaced with a pre-embedded corrugated web box connector, and an I-beam is provided at the junction of the connectors.

[0023] When using an L-shaped connection, the cavity at one end of the shear wall is replaced with a pre-embedded corrugated web box-type connector, and an L-shaped steel is provided at the junction of the connectors.

[0024] When using a T-shaped connection, one end cavity of the aforementioned shear wall is replaced with a pre-embedded corrugated web box-type connector three, and the other shear wall is replaced with a pre-embedded corrugated web box-type connector four. A T-shaped steel is provided at the junction of the connectors.

[0025] The prefabricated corrugated web box-type connector includes two identical rectangular corrugated webs, one end of which is welded to a large steel plate, and the other end of each is welded to an identical rectangular small steel plate. The direction of the small steel plates of the two webs of the prefabricated corrugated web box-type connector is parallel to the large steel plate.

[0026] The prefabricated corrugated web box-type connector II includes a short and a long corrugated web, both with a flat section at one end and a sloping section in the same direction at the other end. The flat section ends are welded to a large steel plate, and the sloping section ends are each welded with the same small rectangular steel plate. The direction of the small steel plates of the two webs of the prefabricated corrugated web box-type connector II is at a 45° angle to the large steel plate.

[0027] The prefabricated corrugated web box-type connector three includes two identical corrugated webs, one end of which is a flat section and the other end is a mirror-symmetrical oblique section. The flat section ends are welded to the large steel plate, and the oblique section ends are each welded to the same rectangular small steel plate. The directions of the small steel plates of the two webs of the prefabricated corrugated web box-type connector three are at 45° and 135° angles to the large steel plate, respectively.

[0028] The prefabricated corrugated web box connector includes two identical corrugated webs, one end of which is a flat section, and the other end has a sloping section and a flat section respectively. The flat section ends are welded to the large steel plate, and the sloping section and flat section ends are each welded with the same small rectangular steel plate. The directions of the small steel plates of the two webs are at a 45° angle to the large steel plate and parallel to it, respectively.

[0029] The corrugated web of the horizontal connection system is welded to both sides of a large rectangular steel plate near the wall. The large steel plate is welded with studs. Holes are opened between the small rectangular steel plates that connect the horizontal connection system, and bolts are used for connection.

[0030] The horizontal connection system encloses areas with intersecting steel sections, each with a stud welded on it. The shape of the steel section is determined by the shape of the horizontal connection: H-beams are used for straight horizontal connections, L-shaped steel sections are used for L-shaped horizontal connections, and T-shaped steel sections are used for T-shaped horizontal connections.

[0031] A construction method for a partially precast cavity shear wall hybrid structure includes the following steps:

[0032] S1. In the factory, studs are welded onto the web of the I-beam and the square steel pipe. Two rectangular steel plates and two trapezoidal steel plates of the same size are welded together to form a constriction. A section of steel pipe is welded to the open end to form a box-shaped steel pipe. The other end of the constriction is sealed to form a box-shaped steel pipe. The longitudinal reinforcement is welded to the four corners of the box-shaped steel pipe. Foam board is placed inside as a hollow inner mold. Then the reinforcement cage is tied and the square steel pipe and box-shaped steel pipe are fixed. The tied reinforcement cage is supported by formwork with openings at both ends. After the precast concrete reaches a certain strength, the foam board is dissolved with turpentine to form a precast concrete shear wall panel with cavity one and cavity two.

[0033] S2, transport the precast concrete shear wall panels with cavity one and cavity two and the I-beam to the construction site;

[0034] S3. During construction, the first I-beam is installed, and then the precast concrete shear wall panels are fitted onto the first I-beam. The reinforcement of the floor slab is tied and the formwork is erected. The concrete in cavity one is poured at the same time as the floor slab concrete, and cavity two is filled with grout.

[0035] S4. After the cast-in-place concrete reaches a certain strength, the upper precast concrete wall panels are built up according to the positioning of the I-beams and square steel pipes, and then cast-in-place concrete is poured. This process is repeated until all layers of steel frame-steel concrete shear wall structures are installed.

[0036] S1 includes: the studs welded to the I-beam and the square steel pipe are different; the studs on the I-beam are slightly longer than those on the square steel pipe; the stud spacing on the I-beam and the square steel pipe is the same; circular grouting hole steel pipes are welded to the upper and lower ends of the box-shaped steel pipe; the vertically distributed reinforcing bars near the box-shaped steel pipe and on the side of the grouting hole steel pipe need to be shortened to above the box-shaped steel pipe; when binding the square steel pipe and the box-shaped steel pipe, they need to be on the same vertical line to avoid the square steel pipe of this layer not being able to be inserted into the box-shaped steel pipe of the upper wall panel;

[0037] When connecting wall panels, a precast corrugated web box connector is welded to one end of the transversely distributed steel bars to replace the stirrups at this end of the cavity.

[0038] The vertically distributed reinforcing bars near cavity two and on the side of the grouting hole should be shortened to above the bottom of cavity two to leave enough space for the grouting hole steel pipe welded to cavity two.

[0039] The S2 includes: cavity one adopts a through structure, and cavity two is only located at the lower end of the middle part of the precast concrete shear wall piece.

[0040] The S3 includes: when installing the connecting wall plate, first install the I-beam and the horizontal connecting steel, then fit the horizontal connecting wall plate into it, then tighten the bolts at the joint of the connecting parts, and then pour cast-in-place concrete together with the floor slab.

[0041] The beneficial effects of this invention are:

[0042] 1. Fast construction speed

[0043] This invention combines partial prefabrication and assembly technology, employing a partially prefabricated and partially cast-in-place construction method. Compared to fully cast-in-place steel-concrete shear wall structures, it eliminates the need for on-site rebar tying and formwork erection. Furthermore, on-site filling of the cavities with cast-in-place concrete is all that is required, significantly reducing wet work and greatly simplifying the construction process. Moreover, the construction of the superstructure does not have to wait until the cast-in-place concrete reaches a certain strength, as the prefabricated shear wall panels can bear the construction load, greatly shortening the construction period.

[0044] 2. Good overall structural integrity

[0045] The cavity of the precast shear wall panel of this invention is treated with a narrowing treatment, which enables a tight bond between cast-in-place and precast concrete without misalignment; in addition, the combination of cast-in-place and precast greatly enhances the integrity of the structure and the reliability of the connection area.

[0046] 3. Cost savings

[0047] The construction process of this invention involves less wet work, and the hollow part can be used as a formwork for the cast-in-place part, saving a lot of formwork and support costs. In addition, there is no need for large-scale steel reinforcement binding on site, which greatly reduces labor costs.

[0048] 4. Good horizontal connection function

[0049] The horizontal connection of this invention uses a corrugated web box-shaped connector pre-embedded in precast concrete. The back of the large steel plate is welded with studs to enhance the horizontal connection between the connector and the concrete. The small steel plate has bolt holes on both sides. The corrugated web greatly enhances the horizontal connection between the wall panels. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the structure of the present invention.

[0051] Figure 2 This is a layout diagram of the present invention.

[0052] Figure 3 This is a construction flowchart of the present invention.

[0053] Figure 4 This is a schematic diagram of the horizontal connection in a straight line according to the present invention.

[0054] Figure 5 This is a schematic diagram of the L-shaped horizontal connection of the present invention.

[0055] Figure 6 This is a schematic diagram of the T-shaped horizontal connection of the present invention.

[0056] Figure 7 This is a detailed drawing of the box-type steel pipe of the present invention.

[0057] Figure 8 This is a top view schematic diagram of the present invention.

[0058] Figure 9 This is a schematic diagram of the cavity combined with the steel profile and square steel tube of the present invention.

[0059] Figure 10 This is a schematic diagram of the steel reinforcement distribution of the present invention.

[0060] Figure 11 This is a schematic diagram of cavity one and cavity two of the present invention.

[0061] Figure 12 These are schematic diagrams of the first, second, third, and fourth pre-embedded corrugated web box-type connectors of the present invention.

[0062] Figure 13 These are schematic diagrams of steel sections one, two, and three at the horizontal connection node of the present invention.

[0063] Figure 14 This is a detailed connection diagram of the connector joint of the present invention.

[0064] Figure label:

[0065] 1. Precast concrete shear wall panel; 2. I-beam; 3. Cast-in-place concrete; 4. Square steel pipe; 5. Cavity 1; 6. Cavity 2; 7. Precast concrete; 8. Vertical distributed reinforcement; 9. Horizontal distributed reinforcement; 10. Longitudinal reinforcement; 11. Stirrups; 12. Box-type steel pipe 1; 13. Box-type steel pipe 2; 14. Grouting material; 15. Grouting hole; 16. Embedded corrugated web box-type connector 1; 17. Embedded corrugated web box-type connector 2; 18. Embedded corrugated web box-type connector 3; 19. Embedded corrugated web box-type connector 4; 20. I-beam; 21. L-shaped steel; 22. T-shaped steel; 23. Bolt. Detailed Implementation

[0066] The present invention will now be described in further detail with reference to the accompanying drawings.

[0067] refer to Figures 1 to 11 The present invention is based on a steel frame-steel concrete shear wall constructed by superposition method, mainly including a precast concrete shear wall panel 1 with a vertical cavity 1 5 and a vertical cavity 2 6, an I-beam 2 inserted into cavity 1 5, a square steel pipe 4 inserted into cavity 2 6, and cast-in-place concrete 3 poured into cavity 1 5 and grouting material 14 filled into cavity 2 6, with grouting material 14 filling the square steel pipe 4.

[0068] The precast concrete shear wall panel 1 has two cavities, 5 and 6, symmetrically arranged at both ends and the middle. Cavity 5 is through-hole, while cavity 6 is only located at the lower part of the precast concrete shear wall panel 1. Both cavities have constricted openings, which are formed by welding two rectangular steel plates and two trapezoidal steel plates of the same size. The cross-section at the opening is smaller than the cross-section inside the cavity. The precast concrete shear wall panel 1 is precast from precast concrete 7 to ensure the common working performance between cast-in-place concrete 3 and precast concrete 7. Studs are welded to the web of the I-beam steel 2 inserted into cavity 5 to ensure the bond between the I-beam steel 2 and the cast-in-place concrete 3. The precast concrete 7 uses ultra-high performance concrete, while the cast-in-place concrete 3 uses ordinary concrete, and both are poured simultaneously with the floor slab concrete. In addition, to simplify the splicing process of the reinforcing bars, the middle vertical reinforcing bars are replaced with square steel pipes 4. Studs are welded to the outside of the square steel pipes 4 and embedded in the upper part of the middle part of the precast concrete shear wall panel 1.

[0069] This invention relates to a steel frame-steel concrete shear wall constructed using a superposition method, which includes prefabrication construction and on-site construction. The prefabrication construction mainly involves preparing prefabricated concrete shear wall panels 1, while the on-site construction mainly involves installing the prefabricated panels, inserting I-beams 2, and pouring cast-in-place concrete 3.

[0070] Along the length of the precast concrete shear wall panel 1, there are two cavities 1 (5) and two cavities 2 (6) symmetrically arranged at both ends and the middle of the precast concrete shear wall panel 1. Cavity 1 (5) is a through cavity, while cavity 2 (6) is only arranged at the lower part of the precast concrete shear wall panel 1. Both cavities have constricted openings, which are formed by welding two rectangular steel plates and two trapezoidal steel plates of the same size. The cross-section at the opening is smaller than the cross-section inside the cavity.

[0071] like Figure 1 As shown, the preparation of a steel frame-steel concrete shear wall based on a superposition method of prefabrication of a portion followed by casting of the remaining portion includes the following steps:

[0072] S1, at the factory, studs are welded onto the web of the I-beam 2 and the square steel pipe 4. Two rectangular steel plates and two trapezoidal steel plates of the same size are welded together to form a constriction. A section of steel pipe is welded to the open end to form a box-shaped steel pipe 12. The other end of the constriction is sealed to form a box-shaped steel pipe 23. The longitudinal reinforcement is welded to the four corners of the box-shaped steel pipe 12. Foam board is placed inside as a hollow inner mold. Then the reinforcement cage is tied and the square steel pipe 4 and the box-shaped steel pipe 23 are fixed. The tied reinforcement cage is supported by formwork with openings at both ends. After the precast concrete 7 reaches a certain strength, the foam board is dissolved with rosin to form a precast concrete shear wall panel 1 with cavities 15 and 26.

[0073] Furthermore, the studs welded to the I-beam 2 and the square steel pipe 4 are different; the studs on the I-beam 2 are slightly longer than those on the square steel pipe 4, and the spacing between the studs on both the I-beam 2 and the square steel pipe 4 is the same. Circular grouting hole 15 steel pipes are welded to the upper and lower ends of the box-shaped steel pipe 2 13. The vertically distributed reinforcing bars 8 near the box-shaped steel pipe 2 13 and on the side of the grouting hole 15 steel pipe need to be shortened to above the box-shaped steel pipe 2 13. When binding the square steel pipe 4 and the box-shaped steel pipe 2 13, they must be on the same vertical line to avoid the box-shaped steel pipe 2 13 of this layer not being able to be inserted into the square steel pipe 4 of the lower wall panel.

[0074] S2, transport the precast concrete shear wall panel 1 with cavity 5 and cavity 6 and the I-beam 2 to the construction site.

[0075] Furthermore, cavity 5 adopts a through-hole design, while cavity 6 is only designed at the lower end of the middle part of the shear wall and steel pipes are welded to its upper and lower ends for grouting.

[0076] S3. During construction, the I-beam 12 is installed first, and then the precast concrete shear wall 1 is fitted onto the I-beam 12. The reinforcement of the floor slab is tied and the formwork is erected. The concrete in cavity 15 is poured at the same time as the floor slab concrete. Cavity 26 is filled with grout 14.

[0077] Furthermore, the precast concrete 7 is made of ultra-high performance concrete, while the cast-in-place concrete 3 is made of ordinary concrete.

[0078] S4. After the cast-in-place concrete 3 reaches a certain strength, the upper precast concrete shear wall 1 is erected according to the positioning of the I-beam 2 and the square steel pipe 4, and then the cast-in-place concrete 3 is poured. This process is repeated until all layers of steel frame-steel concrete shear wall structure are installed.

[0079] Furthermore, the length of the square steel pipe 4 needs to take into account three parts: the part embedded in the precast wall panel, the thickness of the floor slab, and the length of the cavity 2, in order to prevent the square steel pipe 4 from not being able to be properly inserted into the cavity 2 6 after the cast-in-place concrete 3 is poured.

[0080] The upper part of the middle section of the precast concrete shear wall panel is designed with a square steel pipe 4, and the lower part is designed with a cavity 2 6, which replaces the vertical steel bars, greatly saving steel consumption and reducing construction work.

[0081] like Figure 2 As shown, a partially prefabricated cavity shear wall is applied to the shear wall structure system of high-rise buildings, which effectively saves construction costs and is convenient to construct.

[0082] like Figure 3 As shown, based on the I-beam 2 and square steel tube 4 extending from the completed lower-level shear wall, the shear wall panels of this floor are positioned. The precast concrete shear wall panels 1 are then fitted into the I-beam 2 and square steel tube 4, and then cast-in-place concrete 3 is poured together with the floor slab. This process is repeated after the concrete reaches a certain strength until all floors of the steel frame-steel-concrete shear wall structure are installed. By fitting the precast concrete shear wall panels 1 into the I-beam 2 and square steel tube 4, a significant amount of work related to tying reinforcing bars and erecting formwork is eliminated, shortening the project duration.

[0083] like Figure 4 As shown, a horizontal connection of the shear wall of the present invention is adopted, which adopts a straight horizontal connection when a long shear wall is required.

[0084] like Figure 5 As shown, a horizontal connection of the shear wall according to the present invention is adopted when the shear wall is located at the corner of the wall, and an L-shaped horizontal connection is used.

[0085] like Figure 6 As shown, a horizontal connection of the shear wall of the present invention is adopted. When the shear wall is applied to a T-shape, a T-shaped horizontal connection is adopted.

[0086] like Figure 7 As shown, box-shaped steel pipes 12 are located at both ends of cavity 5, with longitudinal reinforcement 10 arranged at their four corners to form edge restraint members, improving the load-bearing performance of the shear wall. Cast-in-place concrete 3 is poured into cavity 5 together with the floor slab.

[0087] like Figure 8 As shown, a partially precast cavity shear wall is provided, with the main body of the wall panel being precast concrete 7, and cavities 5 set at both ends of the wall. I-beams 2 are arranged in the cavities 5. After assembly, cast-in-place concrete 3 is poured. An embedded square steel pipe 4 is set in the middle of the wall, and horizontal distributed steel bars 9 and vertical distributed steel bars 8 are set on both sides of the wall.

[0088] like Figure 9As shown, welded studs on I-beam 2 and square steel tube 4 improve their connection with concrete and structural integrity. Alternatively, honeycomb steel can be used for I-beam 2, effectively saving steel and reducing costs. The opening sizes of the constricted ends of box-type steel tube 12 and box-type steel tube 23 are slightly larger than those of I-beam 2 and square steel tube 4 to prevent manufacturing errors that would prevent I-beam 2 and square steel tube 4 from being inserted into cavities 15 and 26, respectively. The upper and lower ends of the middle section of the precast shear wall panel are designed with square steel tube 4 and cavity 26, respectively, which greatly saves steel and reduces on-site construction work compared to the through-hole design of square steel tubes.

[0089] like Figure 10 As shown, the vertically distributed reinforcing bars 8 near the cavity 2 6 and on the side of the grouting hole 15 should be shortened to above the bottom of the cavity 2 6 to leave enough space for the steel pipe of the grouting hole 15 welded to the cavity 2 6.

[0090] like Figure 11 As shown, the foam board and the box-shaped steel pipe 12 form cavity 5. The foam board is dissolved with rosin after the concrete reaches a certain strength. Optionally, the middle part of cavity 5 is also made of square steel pipe with tapered steel sleeves welded to both ends. Cast-in-place concrete 3 is poured into cavity 5, and it is poured together with the floor slab. Cavity 6 is filled with grout 14.

[0091] like Figure 12 As shown, studs are welded to the large steel plate of the connector, and bolts 23 are used to connect the small steel plates. Four types of connectors are used for horizontal connections of different shapes, including: For prefabricated corrugated web box-type connector 16, the directions of the small steel plates of both webs are parallel to the large steel plate; for prefabricated corrugated web box-type connector 2 17, the directions of the small steel plates of both webs are at a 45° angle to the large steel plate; for prefabricated corrugated web box-type connector 3 18, the directions of the small steel plates of both webs are at a 45° angle and a 135° angle to the large steel plate, respectively; and for prefabricated corrugated web box-type connector 4 19, the directions of the small steel plates of both webs are at a 45° angle to the large steel plate and parallel to it, respectively.

[0092] like Figure 13 As shown, studs are welded onto the connecting steel sections to enhance the integrity between the steel sections and the cast-in-place concrete.

[0093] like Figure 14 As shown, the small steel plates of the connector are connected by bolts 23 to ensure the horizontal connection of the connector before the cast-in-place concrete is poured.

Claims

1. A partially prefabricated cavity shear wall hybrid structure, characterized in that, Including precast concrete shear wall panels (1), which are precast from precast concrete (7). Along the height direction, I-beams (2) are vertically penetrating the upper and lower ends of the precast concrete shear wall panels (1) at both ends. Two square steel pipes (4) are penetrating the middle of the precast concrete shear wall panels (1). Cavity 1 (5) and cavity 2 (6) are arranged in the precast concrete shear wall panels (1). I-beam (2) is placed in cavity one (5) along the height direction, square steel pipe (4) is placed in cavity two (6) along the height direction, concrete (3) is poured in cavity one (5), and grouting material (14) is filled in square steel pipe (4). The cavity (5) is provided with box-shaped steel pipes (12) at both ends. The box-shaped steel pipes (12) have a constricted structure. The four corners of the box-shaped steel pipes (12) are welded with longitudinal ribs (10), and the longitudinal ribs (10) are fixed with stirrups (11) on the outside. The cavity two (6) includes a box-shaped steel pipe two (13) with a constricted opening. The bottom of the box-shaped steel pipe two (13) with a constricted opening is sealed. The box-shaped steel pipe two (13) with a constricted opening is set in the middle part. A grouting hole (15) is reserved on the box-shaped steel pipe two (13) with a constricted opening. A square steel pipe (4) is inserted into the box-shaped steel pipe two (13) with a constricted opening. The grouting hole (15) is used for grouting. The first cavity (5) is vertically set and penetrates the precast concrete shear wall piece (1) to form a through hole at the top and bottom. During construction, the first I-beam (2) is inserted and then cast-in-place concrete (3) is poured. The second cavity (6) is not set through and is only arranged at the bottom of the precast concrete shear wall piece (1).

2. The partially prefabricated cavity shear wall hybrid structure according to claim 1, characterized in that, The opening of cavity one (5) is larger than the opening of the corresponding I-beam one (2), and the opening of cavity two (6) is larger than the opening of the corresponding square steel pipe (4). The square steel tube (4) is embedded in the upper part of the middle section of the precast concrete shear wall piece (1) in the factory; the I-beam (2) is made of honeycomb steel.

3. A partially prefabricated cavity shear wall hybrid structure according to claim 1, characterized in that, The first box-type steel pipe (12) and the second box-type steel pipe (13) are rectangular or circular in shape; The first box-type steel pipe (12) and the second box-type steel pipe (13) adopt rectangular cross sections. The constricted part is welded from two rectangular steel plates of the same size and two trapezoidal steel plates of the same size. The main part is a section of box-type steel pipe, which is welded from steel plates. The middle part of the cavity (5) is a foam board or a square steel pipe.

4. The application of the partially prefabricated cavity shear wall hybrid structure according to any one of claims 1-3, characterized in that, When the required shear wall in the horizontal direction is long, a horizontal connection system is needed to connect some of the precast cavity shear walls; the horizontal connection system includes three types of horizontal connection: straight, L-shaped and T-shaped. When the required shear wall in the straight direction is relatively long and the span of the edge restraint member is large, a straight-line shape is adopted; When shear walls are used at corners, an L-shape is adopted; When shear walls are used with T-shaped connections, a T-shape should be adopted; When using a straight connection, the cavity at one end of the shear wall (5) is replaced with a pre-embedded corrugated web box connector (16), and an I-beam (20) is provided at the junction of the connectors. When using an L-shaped connection, the cavity one (5) at one end of the shear wall is replaced by a pre-embedded corrugated web box-type connector two (17), and an L-shaped steel (21) is provided at the junction of the connectors. When using a T-shaped connection, one end cavity (5) of the above shear wall is replaced with a pre-embedded corrugated web box-type connector (18), and the other shear wall is replaced with a pre-embedded corrugated web box-type connector (19). A T-shaped steel (22) is provided at the junction of the connectors.

5. The application of the partially prefabricated cavity shear wall hybrid structure according to claim 4, characterized in that, The pre-embedded corrugated web box-type connector (16) includes two identical rectangular corrugated webs, one end of which is welded to a large steel plate, and the other end of which is welded to an identical rectangular small steel plate. The direction of the small steel plates of the two webs of the pre-embedded corrugated web box-type connector (16) is parallel to the large steel plate. The pre-embedded corrugated web box-type connector II (17) includes a short and a long corrugated web, one end of which is a flat section and the other end is a slanted section in the same direction. The flat section ends are all welded to the large steel plate, and the slanted section ends are each welded with the same rectangular small steel plate. The direction of the small steel plates of the two webs of the pre-embedded corrugated web box-type connector II (17) is at a 45° angle to the large steel plate. The pre-embedded corrugated web box-type connector three (18) includes two identical corrugated webs, one end of which is a flat section and the other end is a mirror-symmetrical oblique section. The flat section ends are welded to the large steel plate, and the oblique section ends are each welded with the same rectangular small steel plate. The directions of the small steel plates of the two webs of the pre-embedded corrugated web box-type connector three (18) are at an angle of 45° and 135° to the large steel plate, respectively. The pre-embedded corrugated web box connector four (19) includes two identical corrugated webs, one end of which is a flat section, and the other end is a slanted section and the other is a flat section. The flat section ends are welded to the large steel plate, and the slanted section and the flat section ends are each welded with the same rectangular small steel plate. The directions of the small steel plates of the two webs are at a 45° angle to the large steel plate and parallel to it, respectively.

6. The application of the partially prefabricated cavity shear wall hybrid structure according to claim 5, characterized in that, The corrugated web of the horizontal connection system is welded to both sides of a rectangular large steel plate near the wall. The large steel plate is welded with studs. Holes are opened between the rectangular small steel plates that are connected to each other in the horizontal connection system, and bolts (23) are used for connection. The horizontal connection system encloses areas with intersecting steel sections, each with welded studs. The shape of the steel sections is determined by the shape of the horizontal connection: H-beams are used for straight horizontal connections, L-shaped irregular steel sections are used for L-shaped horizontal connections, and T-shaped irregular steel sections are used for T-shaped horizontal connections.

7. The construction method of the partially prefabricated cavity shear wall hybrid structure according to any one of claims 1-3, characterized in that, Includes the following steps: S1, at the factory, studs are welded on the web of the I-beam (2) and the square steel pipe (4). Two rectangular steel plates of the same size and two trapezoidal steel plates of the same size are welded to form a constriction. A section of steel pipe is welded to the open end to form a box-shaped steel pipe (12). The other end of the constriction is sealed to form a box-shaped steel pipe (13). The longitudinal reinforcement is welded to the four corners of the box-shaped steel pipe (12). Foam board is placed in the box as a hollow inner mold. Then the steel cage is tied and the square steel pipe (4) and the box-shaped steel pipe (13) are fixed. The tied steel cage is supported by formwork with openings at both ends of the formwork. After the precast concrete (7) reaches a certain strength, the foam board is dissolved with rosin to form a precast concrete shear wall piece (1) with cavity one (5) and cavity two (6). S2, transport the precast concrete shear wall piece (1) with cavity one (5) and cavity two (6) and the I-beam (2) to the construction site; S3, during construction, first install the I-beam (2), then put the precast concrete shear wall piece (1) onto the I-beam (2), tie the reinforcing bars and formwork for the floor slab, pour the concrete in cavity one (5) at the same time as the floor slab concrete, and fill cavity two (6) with grout (14). S4. After the cast-in-place concrete (3) reaches a certain strength, the upper precast concrete shear wall panel (1) is positioned and built up according to the I-beam (2) and square steel pipe (4), and then cast-in-place concrete (3) is poured. This process is repeated until all layers of steel frame-steel concrete shear wall structure are installed.

8. The construction method of the partially prefabricated cavity shear wall hybrid structure according to claim 7, characterized in that, The S1 includes: the studs welded to the I-beam (2) and the square steel pipe (4) are different; the studs on the I-beam (2) are slightly longer than the studs on the square steel pipe (4); the stud spacing on the I-beam (2) and the square steel pipe (4) is the same; circular grouting hole (15) steel pipes are welded to the upper and lower ends of the box-shaped steel pipe (13); the vertically distributed steel bars (8) close to the box-shaped steel pipe (13) and on the side of the grouting hole (15) steel pipe need to be shortened to above the box-shaped steel pipe (13); when binding the square steel pipe (4) and the box-shaped steel pipe (13), they need to be on the same vertical line. When making connecting wall panels, a precast corrugated web box connector is welded to one end of the transversely distributed steel bar (9) to replace the cavity one (5) and the stirrup (11) at this end. The vertically distributed reinforcing bars (8) near cavity two (6) and on the side of the grouting hole (15) should be shortened to above the bottom of cavity two (6); The S2 includes: cavity one (5) adopts a through structure, and cavity two (6) is only set at the lower end of the middle part of the precast concrete shear wall piece (1); The S3 includes: when installing the connecting wall plate, first install the I-beam (2) and the horizontal connecting steel, put the horizontal connecting wall plate in, then tighten the bolts (23) at the junction of the connecting parts, and then pour the cast-in-place concrete (3) together with the floor slab.

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