Multi-cavity steel reinforced concrete composite structure and construction method thereof

Abstract

The application provides a multi-cavity shaped steel concrete composite structure and a construction method thereof, two multi-cavity shaped steel units adjacent in the transverse direction are connected by a transverse connecting steel pipe, two multi-cavity shaped steel units adjacent in the longitudinal direction are connected by a longitudinal connecting unit, and an underground wall structure is formed after pouring concrete, so that the need of the bearing capacity of the connecting position can be met, meanwhile, the transverse connecting steel pipe and the longitudinal connecting unit can also play a role of alignment, and assist in the lowering of the multi-cavity shaped steel unit, so that the efficiency of lowering can be improved, the construction period can be shortened, and the application prospect in actual engineering is great.

Description

Technical Field

[0001] This application belongs to the field of civil engineering technology, specifically relating to a multi-cavity steel-concrete composite structure and its construction method. Background Technology

[0002] Multi-cavity steel-concrete composite structures refer to a new type of structure formed by butt-welding multiple steel flanges together to form multiple cavities, into which concrete is poured. The integrated operation of the steel and concrete gives steel-concrete composite structures advantages over traditional reinforced concrete structures, including greater load-bearing capacity, greater stiffness, and better seismic performance. Compared to steel structures, they offer better fire resistance, better local and overall structural stability, and savings in steel resources.

[0003] In related technologies, the multi-cavity steel units of multi-cavity steel-concrete composite structures are prefabricated in a factory and then transported to the construction site for assembly into a continuous underground wall. Before assembly, a trench is excavated, and multiple multi-cavity steel units are lowered sequentially to complete the assembly. However, due to the lack of a connecting structure between adjacent multi-cavity steel units, lateral and longitudinal alignment cannot be maintained during lowering. This affects the success rate of lowering, requiring multiple adjustments to the lowering position and hindering construction efficiency. Furthermore, the lack of a connecting structure between adjacent multi-cavity steel units prevents them from forming a common load-bearing structure, making the connection points of the connecting steel units weak points in terms of load-bearing capacity.

[0004] Therefore, it is necessary to provide a multi-cavity steel-concrete composite structure and its construction method to solve the problems mentioned in the background art. Summary of the Invention

[0005] This application provides a multi-cavity steel-concrete composite structure and its construction method. It utilizes transverse connecting steel pipes to connect two horizontally adjacent multi-cavity steel units, and longitudinal connecting units to connect two vertically adjacent multi-cavity steel units. After concrete pouring, an underground wall structure is formed, which can meet the bearing capacity requirements of the connection points. Simultaneously, the transverse connecting steel pipes and longitudinal connecting units can also serve as alignment aids in the lowering of the multi-cavity steel units, thereby improving the lowering efficiency and shortening the construction cycle. This structure has significant application prospects in practical engineering.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] A multi-cavity steel-concrete composite structure, comprising:

[0008] A multi-cavity steel section unit includes multiple horizontally arranged H-beams, with two adjacent H-beams fixed and fitted together to form a hollow cavity, and the multiple H-beams staggered in the vertical direction. Each H-beam includes two parallel spaced wing plates and a web plate connecting the two wing plates, with the two wing plates and the web plate fitting together to form an H-shaped structure.

[0009] A transverse connecting steel pipe connects two transversely adjacent multi-cavity steel units;

[0010] A longitudinal connecting unit connects two longitudinally adjacent multi-cavity steel sections. The longitudinal connecting unit includes a male connector, a female connector, and a longitudinal connecting steel pipe. The male connector is fixed to the outside of the wing plate. The male connectors on the upper multi-cavity steel section and the male connectors on the lower multi-cavity steel section are arranged opposite each other. The female connector is located in the soil trench. Two male connectors located on different multi-cavity steel sections and arranged opposite each other are inserted into the same female connector. In the two longitudinally adjacent multi-cavity steel sections, the multiple hollow cavities of the lower multi-cavity steel section and the upper multi-cavity steel section are arranged opposite each other. A part of the longitudinal connecting steel pipe is located in the hollow cavity of the upper multi-cavity steel section, and another part is located in the hollow cavity of the lower multi-cavity steel section.

[0011] The multi-cavity steel unit, the transverse connecting steel pipe and the longitudinal connecting unit are all embedded in the concrete, and the concrete, together with the multi-cavity steel unit, the transverse connecting steel pipe and the longitudinal connecting unit, forms an underground wall structure.

[0012] Preferably, in two horizontally adjacent multi-cavity steel sections, the rightmost H-beam in the left multi-cavity steel section and the leftmost H-beam in the right multi-cavity steel section cooperate to form a first mounting cavity. The horizontal connecting steel pipe is installed in the first mounting cavity and fixed to the two H-beams that form the first mounting cavity.

[0013] Preferably, the height of the upper end face of the plurality of H-beams decreases from both sides to the middle, so that the top of the multi-cavity steel unit forms a mortise and the bottom forms a tenon, and the tenon of the upper multi-cavity steel unit engages with the mortise of the lower multi-cavity steel unit.

[0014] Preferably, the upper end faces of two adjacent H-beams are at different heights, and the upper end faces of two H-beams located on both sides of one H-beam are at the same height. Multiple slots are formed at the top and bottom of the multi-cavity steel unit, and the slots of the upper and lower multi-cavity steel units interlock with each other.

[0015] Preferably, the longitudinal connecting steel pipe is a rectangular steel pipe, and the stress on the longitudinal connecting steel pipe satisfies the following conditions:

[0016] (1) The axial compression bearing capacity satisfies:

[0017] N u1 =a=b×(1.212+B1θ1+C1θ1) 2 )×f c1 ;

[0018]

[0019]

[0020]

[0021] In the formula, N u1 θ represents the design value of the axial compressive bearing capacity of the longitudinally connected steel pipe; a and b are the lengths of the long and short sides of the longitudinally connected steel pipe, respectively; B1 and C1 are the influence coefficients of the cross-sectional shape on the confinement effect; θ1 is the confinement coefficient of the steel-concrete composite member; f c1 The design value of the compressive strength of concrete; t a t b These are the wall thicknesses of the long and short sides of the rectangular steel pipe, respectively; f y1 The design value of the yield strength of the steel used for longitudinally connected steel pipes;

[0022] (2) The shear bearing capacity satisfies:

[0023]

[0024] In the formula, V u ψ1 represents the design value of the shear bearing capacity of the longitudinally connected steel pipe; ψ1 represents the void ratio of the steel-concrete composite member.

[0025] (3) The bending bearing capacity satisfies:

[0026]

[0027] In the formula, M u1 This represents the design value for the bending bearing capacity of the longitudinally connected steel pipe.

[0028] Preferably, the male connector is a T-shaped connector, and the female connector is provided with a T-shaped groove, and the male connector is installed in the T-shaped groove of the female connector.

[0029] Preferably, the transverse connecting steel pipe is a square steel pipe, and the stress on the transverse connecting steel pipe satisfies the following conditions:

[0030] (1) The axial compression bearing capacity satisfies:

[0031] N u2 =c 2 ×(1.212+B2θ2+C2θ2 2 )×fc2 ;

[0032]

[0033]

[0034]

[0035] In the formula, N u2 θ represents the design value of the axial compressive bearing capacity of the transverse connecting steel pipe, c represents the side length of the transverse connecting steel pipe; B2 and C2 are the influence coefficients of the cross-sectional shape on the confinement effect; θ2 represents the confinement coefficient of the steel-concrete composite member; f c The design value of the compressive strength of the concrete is represented by t; the wall thickness of the transverse connecting steel pipe is represented by f. y2 This is the design value for the yield strength of the steel.

[0036] (2) Shear bearing capacity satisfies:

[0037]

[0038] In the formula, V u2 This represents the design value of the shear bearing capacity of the transverse connecting steel pipe; ψ2 is the void ratio of the steel-concrete composite member.

[0039] (3) The bending bearing capacity satisfies:

[0040]

[0041] πr0 2 =c 2 ;

[0042] In the formula, M u2 The value of the flexural bearing capacity of the transverse connecting steel pipe is represented by r0, where r0 represents the equivalent circle radius of the cross-section of the transverse connecting steel pipe. ci The radius is the hollow radius.

[0043] This application also provides a construction method for the above-mentioned multi-cavity steel-concrete composite structure, including the following steps:

[0044] S1: Prefabricated multi-cavity steel unit, the male connector is fixed to the outside of the wing plate, the bottom of the longitudinal connecting steel pipe is fixed in the hollow cavity, and the top is exposed;

[0045] S2: Excavate a soil trench, vertically hoist the female connector into one side of the soil trench, and make the opening of the sliding groove on the female connector face the inside of the soil trench;

[0046] S3: Install multiple multi-cavity steel profile units laterally. First, hoist in one multi-cavity steel profile unit, then insert a transverse connecting steel pipe between the two flanges of the outermost H-beam, and hoist in another multi-cavity steel profile unit so that the transverse connecting steel pipe is located in the first installation cavity formed by two transversely adjacent multi-cavity steel profile units. Repeat this process multiple times to achieve lateral expansion.

[0047] S4: Install multiple multi-cavity steel units longitudinally. First, hoist in the bottommost multi-cavity steel unit and slide the male connector into the top of the female connector until the multi-cavity steel unit sinks to the bottom of the soil trench. Hoist in the upper multi-cavity steel units one by one according to the same steps, and slide the male connector into the top of the female connector until the bottom of the multi-cavity steel unit engages with the multi-cavity steel unit below, and make the top of the longitudinal connecting steel pipe located in the hollow cavity of the upper multi-cavity steel unit. Repeat this process multiple times to achieve longitudinal expansion.

[0048] S5: Pour concrete into the soil trench and the hollow cavity of the multi-cavity steel unit. After molding, it forms an underground wall structure with the multi-cavity steel unit, the transverse connecting steel pipe and the longitudinal connecting steel pipe.

[0049] The beneficial effects of this application are as follows:

[0050] This application provides a multi-cavity steel-concrete composite structure and its construction method. It utilizes transverse connecting steel pipes to connect two horizontally adjacent multi-cavity steel units, and longitudinal connecting units to connect two vertically adjacent multi-cavity steel units. After concrete pouring, an underground wall structure is formed, which can meet the bearing capacity requirements of the connection points. Simultaneously, the transverse connecting steel pipes and longitudinal connecting units can also serve as alignment aids in the lowering of the multi-cavity steel units, thereby improving the lowering efficiency and shortening the construction cycle. This structure has significant application prospects in practical engineering. Attached Figure Description

[0051] Figure 1 This is a schematic diagram showing the multi-cavity steel-concrete composite structure provided in this application;

[0052] Figure 2 express Figure 1 Schematic diagram of a multi-cavity steel section unit;

[0053] Figure 3 A schematic diagram showing the connection between two horizontally adjacent multi-cavity steel units;

[0054] Figure 4 express Figure 3 An exploded view of the connection structure shown;

[0055] Figure 5 A schematic diagram showing the connection between two longitudinally adjacent multi-cavity steel sections;

[0056] Figure 6 express Figure 5 An exploded view of the connection structure shown;

[0057] Figure 7 express Figure 5 The front view of the connection structure shown;

[0058] Figure 8 This diagram illustrates another connection between two longitudinally adjacent multi-cavity steel sections.

[0059] Figure 9 A schematic diagram showing the connection between the male and female connectors;

[0060] Figure 10 This is a schematic diagram showing the connection of longitudinally connected steel pipes. Detailed Implementation

[0061] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0062] Please see Figure 1-10 The present invention provides a multi-cavity steel-concrete composite structure 100, including a multi-cavity steel unit 10, a transverse connecting steel pipe 20 and a longitudinal connecting unit 30.

[0063] The multi-cavity steel section unit 10 includes multiple horizontally arranged H-beams 11, with adjacent H-beams 11 welded and fixed together to form a hollow cavity 12. The multiple H-beams 11 are staggered vertically, and all H-beams 11 have the same structure, utilizing industry standard parts. The staggered arrangement means that the upper and lower end faces of adjacent H-beams lie on different planes, thus creating the staggered effect. Please refer to... Figure 7 and Figure 8 , Figure 7 The height of the upper end face of multiple H-beams 11 decreases from both sides to the middle, so that the top of the multi-cavity steel unit 10 forms a mortise and the bottom forms a tenon. During the hoisting of two multi-cavity steel units 10 in the longitudinal direction, the tenon and mortise can be used to form alignment, which assists the hoisting process, reduces the number of times the position is adjusted, and improves the construction efficiency. After the tenon and mortise are engaged, they can also limit each other, restrict the lateral displacement of the multi-cavity steel unit 10, and maintain the stability of the structure. Figure 8In this design, the upper end faces of two adjacent H-beams 11 are at different heights, while the upper end faces of two H-beams located on either side of one H-beam are at the same height. This results in multiple latches forming at the top and bottom of the multi-cavity steel unit 10. The latches of the upper and lower multi-cavity steel units interlock with each other, achieving the same effect as that of mortise and tenon joints, which will not be elaborated upon here.

[0064] The H-beam 11 includes two parallel spaced flanges 111 and a web 112 connecting the two flanges 111. The two flanges 111 and the web 112 cooperate to form an H-shaped structure. Within the multi-cavity steel unit 10, the webs 112 of two adjacent H-beams 11 are parallel, and the flanges 111 are welded and fixed accordingly.

[0065] The transverse connecting steel pipe 20 is used to connect two transversely adjacent multi-cavity steel sections 10. In the two transversely adjacent multi-cavity steel sections 10, the rightmost H-beam of the left multi-cavity steel section and the leftmost H-beam of the right multi-cavity steel section form a first mounting cavity. The transverse connecting steel pipe 20 is installed in the first mounting cavity and fixed to the two H-beams that form the first mounting cavity.

[0066] The longitudinal connecting unit 30 is used to connect two longitudinally adjacent multi-cavity steel units 10. Specifically, the longitudinal connecting unit 30 includes a male connector 31, a female connector 32, and a longitudinally connecting steel pipe 33. The male connector 31 is fixed to the outside of the wing plate 111. The male connectors on the upper multi-cavity steel unit and the male connectors on the lower multi-cavity steel unit are arranged opposite each other. The female connector 32 is located in the soil trench. Two male connectors located on different multi-cavity steel units and arranged opposite each other are inserted into the same female connector. In the two longitudinally adjacent multi-cavity steel units 10, the multiple hollow cavities of the lower multi-cavity steel unit and the upper multi-cavity steel unit are arranged opposite each other. A part of the longitudinal connecting steel pipe 33 is located in the hollow cavity of the upper multi-cavity steel unit, and another part is located in the hollow cavity of the lower multi-cavity steel unit.

[0067] The multi-cavity steel section unit 10 is prefabricated. During the prefabrication process, the bottom of the longitudinal connecting steel pipe 33 is fixed inside the hollow cavity, while the top is exposed. The fixing method can be welding or bolt connection. During hoisting, the exposed top of the longitudinal connecting steel pipe 33 can also assist in the alignment during hoisting, allowing the hollow cavity of the upper multi-cavity steel section unit to be aligned with the exposed part of the longitudinal connecting steel pipe 33 and then inserted.

[0068] Preferably, the male connector 31 is a T-shaped connector, and the female connector 32 is provided with a T-shaped groove, and the male connector 31 is installed in the T-shaped groove of the female connector 32.

[0069] The multi-cavity steel unit 10, the transverse connecting steel pipe 20, and the longitudinal connecting unit 30 are assembled into a single unit within the soil trench. Then, concrete is poured into the soil trench and the hollow cavity of the multi-cavity steel unit 10, completely encasing the multi-cavity steel unit 10, the transverse connecting steel pipe 20, and the longitudinal connecting unit 30. After solidification, this forms the underground wall structure.

[0070] The longitudinal connecting steel pipe 33 is a rectangular steel pipe, and the stress on the longitudinal connecting steel pipe 33 satisfies the following conditions:

[0071] (1) The axial compression bearing capacity satisfies:

[0072] N u1 = a×b×(1.212+B1θ1+C1θ1) 2 )×f c1 ;

[0073]

[0074]

[0075]

[0076] In the formula, N u1 θ represents the design value of the axial compressive bearing capacity of the longitudinally connected steel pipe; a and b are the lengths of the long and short sides of the longitudinally connected steel pipe, respectively; B1 and C1 are the influence coefficients of the cross-sectional shape on the confinement effect; θ1 is the confinement coefficient of the steel-concrete composite member; f c1 The design value of the compressive strength of concrete; t a t b These are the wall thicknesses of the long and short sides of the rectangular steel pipe, respectively; f y1 The design value of the yield strength of the steel used for longitudinally connected steel pipes;

[0077] (2) The shear bearing capacity satisfies:

[0078]

[0079] In the formula, V u ψ1 represents the design value of the shear bearing capacity of the longitudinally connected steel pipe; ψ1 represents the void ratio of the steel-concrete composite member.

[0080] (3) The bending bearing capacity satisfies:

[0081]

[0082] In the formula, Mu1 This represents the design value for the bending bearing capacity of the longitudinally connected steel pipe.

[0083] The transverse connecting steel pipe 20 is a square steel pipe, and the stress on the transverse connecting steel pipe 20 satisfies the following conditions:

[0084] (1) The axial compression bearing capacity satisfies:

[0085] N u2 =c 2 ×(1.212+B2θ2+C2θ2 2 )×f c2 ;

[0086]

[0087]

[0088]

[0089] In the formula, N u2 θ represents the design value of the axial compressive bearing capacity of the transverse connecting steel pipe, c represents the side length of the transverse connecting steel pipe; B2 and C2 are the influence coefficients of the cross-sectional shape on the confinement effect; θ2 represents the confinement coefficient of the steel-concrete composite member; f c The design value of the compressive strength of the concrete is represented by t; the wall thickness of the transverse connecting steel pipe is represented by f. y2 This is the design value for the yield strength of the steel.

[0090] (2) Shear bearing capacity satisfies:

[0091]

[0092] In the formula, V u2 This represents the design value of the shear bearing capacity of the transverse connecting steel pipe; ψ2 is the void ratio of the steel-concrete composite member.

[0093] (3) The bending bearing capacity satisfies:

[0094]

[0095] πr0 2 =c 2 ;

[0096] In the formula, M u2 This represents the design value of the bending bearing capacity of the transverse connecting steel pipe, where r0 represents the equivalent circle radius of the cross-section of the transverse connecting steel pipe; r ci The radius is the hollow radius.

[0097] The multi-cavity steel unit 10, the transverse connecting steel pipe 20, and the longitudinal connecting unit 30 are all embedded in the concrete. The concrete, together with the multi-cavity steel unit 10, the transverse connecting steel pipe 20, and the longitudinal connecting unit 30, forms an underground wall structure that can share the load.

[0098] This application also provides a construction method for the above-mentioned multi-cavity steel-concrete composite structure, comprising the following steps:

[0099] S1: Prefabricated multi-cavity steel unit, the male connector is fixed to the outside of the wing plate, the bottom of the longitudinal connecting steel pipe is fixed in the hollow cavity, and the top is exposed;

[0100] S2: Excavate a soil trench, vertically hoist the female connector into one side of the soil trench, and make the opening of the sliding groove on the female connector face the inside of the soil trench;

[0101] S3: Install multiple multi-cavity steel profile units laterally. First, hoist in one multi-cavity steel profile unit. Then, insert a transverse connecting steel pipe between the two flanges of the outermost H-beam. Hoist in another multi-cavity steel profile unit, so that the transverse connecting steel pipe is located within the first installation cavity formed by two laterally adjacent multi-cavity steel profile units. Repeat this process multiple times to achieve lateral expansion.

[0102] S4: Install multiple multi-cavity steel units longitudinally. First, hoist in the bottommost multi-cavity steel unit and slide the male connector into the top of the female connector until the multi-cavity steel unit sinks to the bottom of the soil trench. Hoist in the upper multi-cavity steel units one by one according to the same steps, and slide the male connector into the top of the female connector until the bottom of the multi-cavity steel unit engages with the multi-cavity steel unit below, and make the top of the longitudinal connecting steel pipe located in the hollow cavity of the upper multi-cavity steel unit. Repeat this process multiple times to achieve longitudinal expansion.

[0103] S5: Pour concrete into the soil trench and the hollow cavity of the multi-cavity steel unit. After molding, it forms an underground wall structure with the multi-cavity steel unit, the transverse connecting steel pipe and the longitudinal connecting steel pipe.

[0104] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A multi-cavity steel-concrete composite structure, characterized in that, include: A multi-cavity steel section unit includes multiple horizontally arranged H-beams, with two adjacent H-beams fixed and fitted together to form a hollow cavity, and the multiple H-beams staggered in the vertical direction. Each H-beam includes two parallel spaced wing plates and a web plate connecting the two wing plates, with the two wing plates and the web plate fitting together to form an H-shaped structure. A transverse connecting steel pipe connects two transversely adjacent multi-cavity steel units; A longitudinal connecting unit connects two longitudinally adjacent multi-cavity steel sections. The longitudinal connecting unit includes a male connector, a female connector, and a longitudinal connecting steel pipe. The male connector is fixed to the outside of the wing plate. The male connectors on the upper multi-cavity steel section and the male connectors on the lower multi-cavity steel section are arranged opposite each other. The female connector is located in the soil trench. Two male connectors located on different multi-cavity steel sections and arranged opposite each other are inserted into the same female connector. In the two longitudinally adjacent multi-cavity steel sections, the multiple hollow cavities of the lower multi-cavity steel section and the upper multi-cavity steel section are arranged opposite each other. A part of the longitudinal connecting steel pipe is located in the hollow cavity of the upper multi-cavity steel section, and another part is located in the hollow cavity of the lower multi-cavity steel section. The multi-cavity steel unit, the transverse connecting steel pipe and the longitudinal connecting unit are all embedded in the concrete, and the concrete, together with the multi-cavity steel unit, the transverse connecting steel pipe and the longitudinal connecting unit, forms an underground wall structure.

2. The multi-cavity steel-concrete composite structure according to claim 1, characterized in that, In two horizontally adjacent multi-cavity steel sections, the rightmost H-beam in the left multi-cavity steel section and the leftmost H-beam in the right multi-cavity steel section cooperate to form a first mounting cavity. The horizontal connecting steel pipe is installed in the first mounting cavity and fixed with the two H-beams that form the first mounting cavity.

3. The multi-cavity steel-concrete composite structure according to claim 1, characterized in that, The height of the upper end face of the multiple H-beams decreases from both sides to the middle, so that the top of the multi-cavity steel unit forms a mortise and the bottom forms a tenon, and the tenon of the upper multi-cavity steel unit engages with the mortise of the lower multi-cavity steel unit.

4. The multi-cavity steel-concrete composite structure according to claim 1, characterized in that, The upper end faces of two adjacent H-beams are at different heights, while the upper end faces of two H-beams located on both sides of one H-beam are at the same height. Multiple slots are formed at the top and bottom of the multi-cavity steel unit, and the slots of the upper and lower multi-cavity steel units interlock with each other.

5. The multi-cavity steel-concrete composite structure according to claim 1, characterized in that, The longitudinal connecting steel pipe is a rectangular steel pipe, and the stress on the longitudinal connecting steel pipe satisfies the following conditions: (1) The axial compression bearing capacity satisfies: In the formula, N u1 θ represents the design value of the axial compressive bearing capacity of the longitudinally connected steel pipe; a and b are the lengths of the long and short sides of the longitudinally connected steel pipe, respectively; B1 and C1 are the influence coefficients of the cross-sectional shape on the confinement effect; θ1 is the confinement coefficient of the steel-concrete composite member; f c1 The design value of the compressive strength of concrete; t a t b These are the wall thicknesses of the long and short sides of the rectangular steel pipe, respectively; f y1 The design value of the yield strength of the steel used for longitudinally connected steel pipes; (2) The shear bearing capacity satisfies: In the formula, V u ψ1 represents the design value of the shear bearing capacity of the longitudinally connected steel pipe; ψ1 represents the void ratio of the steel-concrete composite member. (3) The bending bearing capacity satisfies: In the formula, M u1 This represents the design value for the bending bearing capacity of the longitudinally connected steel pipe.

6. The multi-cavity steel-concrete composite structure according to claim 1, characterized in that, The male connector is a T-shaped connector, and the female connector is provided with a T-shaped groove. The male connector is installed in the T-shaped groove of the female connector.

7. The multi-cavity steel-concrete composite structure according to claim 1, characterized in that, The transverse connecting steel pipe is a square steel pipe, and the stress on the transverse connecting steel pipe meets the following conditions: (1) The axial compression bearing capacity satisfies: N u2 =c 2 ×(1.212+B2θ2+C2θ2 2 )×f c2 ; In the formula, N u2 θ represents the design value of the axial compressive bearing capacity of the transverse connecting steel pipe, c represents the side length of the transverse connecting steel pipe; B2 and C2 are the influence coefficients of the cross-sectional shape on the confinement effect; θ2 represents the confinement coefficient of the steel-concrete composite member; f c The design value of the compressive strength of the concrete is represented by t; the wall thickness of the transverse connecting steel pipe is represented by f. y2 This is the design value for the yield strength of the steel. (2) Shear bearing capacity satisfies: In the formula, V u2 This represents the design value of the shear bearing capacity of the transverse connecting steel pipe; ψ2 is the void ratio of the steel-concrete composite member. (3) The bending bearing capacity satisfies: πr0 2 ＝c 2 ； In the formula, M u2 This represents the design value of the bending bearing capacity of the transverse connecting steel pipe, where r0 represents the equivalent circle radius of the cross-section of the transverse connecting steel pipe; r ci The radius is the hollow radius.

8. A construction method for a multi-cavity steel-concrete composite structure as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Prefabricated multi-cavity steel unit, the male connector is fixed to the outside of the wing plate, the bottom of the longitudinal connecting steel pipe is fixed in the hollow cavity, and the top is exposed; S2: Excavate a soil trench, vertically hoist the female connector into one side of the soil trench, and make the opening of the sliding groove on the female connector face the inside of the soil trench; S3: Install multiple multi-cavity steel profile units laterally. First, hoist in one multi-cavity steel profile unit, then insert a transverse connecting steel pipe between the two flanges of the outermost H-beam, and hoist in another multi-cavity steel profile unit so that the transverse connecting steel pipe is located in the first installation cavity formed by two transversely adjacent multi-cavity steel profile units. Repeat this process multiple times to achieve lateral expansion. S4: Install multiple multi-cavity steel units longitudinally. First, hoist in the bottommost multi-cavity steel unit and slide the male connector into the top of the female connector until the multi-cavity steel unit sinks to the bottom of the soil trench. Hoist in the upper multi-cavity steel units one by one according to the same steps, and slide the male connector into the top of the female connector until the bottom of the multi-cavity steel unit engages with the multi-cavity steel unit below, and make the top of the longitudinal connecting steel pipe located in the hollow cavity of the upper multi-cavity steel unit. Repeat this process multiple times to achieve longitudinal expansion. S5: Pour concrete into the soil trench and the hollow cavity of the multi-cavity steel unit. After molding, it forms an underground wall structure with the multi-cavity steel unit, the transverse connecting steel pipe and the longitudinal connecting steel pipe.

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