Novel multi-cavity double-steel-plate-UHPC composite structure and construction technology

Abstract

The invention discloses a novel multi-cavity double-steel-plate-UHPC composite structure and a construction technology, relates to the technical field of civil engineering structure materials and construction, and solves the problems that in the prior art, interface connecting pieces of a double-steel-plate-UHPC composite structure are not unified in design, and the engineering applicability is poor. According to the technical scheme, a perforated longitudinal partition plate is adopted to divide the space between double steel plates into multiple cavities, the perforated longitudinal partition plate is provided with flowing holes and reinforcing steel bar holes, and penetrating reinforcing steel bars penetrate into the reinforcing steel bar holes and are fixed to end plates through nuts, so that a standardized reinforcing steel bar-UHPC tenon connecting piece and a unified steel-concrete interface connecting mode are formed; meanwhile, pouring deformation is controlled through temporary tools of the constraint steel plates and the constraint pull rods to obtain a multi-cavity double-steel-plate-UHPC combined structure, the steel-concrete interface connection and combination effect is enhanced, the bending-shear-resistant mechanical property and the construction efficiency of the combined plate are improved, and a high-strength, high-toughness and simple-structure scheme is provided for engineering.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of civil engineering structural materials and construction technology, more particularly, it relates to a new type of multi-cavity double-steel plate-UHPC composite structure and construction process. BACKGROUND

[0002] Double-steel plate-concrete structure is an important composite structure form, which uses two outer steel plates as the structural framework, pours concrete in the middle, and sets shear connectors at the steel-concrete interface, relying on the cooperative work of steel and concrete to resist external forces. It is mainly suitable for wall, plate, shell and other components, has flexible construction form, good comprehensive performance and wide application value, and is widely used in building structural shear walls, protective structures and immersed tunnel structures. In addition, it is also used in some engineering applications such as cable-supported bridge tower columns, bridge deck structures and bridge piers.

[0003] The existing technology is based on the traditional double-steel plate-concrete structure, which combines the outer steel plate with the intermediate concrete through shear connectors to form a cooperative force system, and is applied to building shear walls, bridge towers and protective structures. To improve performance, ultra-high performance concrete (UHPC) is used to replace ordinary concrete to reduce the cross-sectional size and self-weight. However, the existing technology has significant defects: 1) the mainstream double-steel plate-UHPC is a single-chamber structure, which lacks internal structural control ability and cannot adapt to the differentiated load distribution of bridge, super high-rise building and other scenarios; 2) the steel-mix interface relies on traditional shear studs or traditional PBL connectors, which have the problems of non-uniform connection type, low transmission efficiency and complex welding process; 3) increasing the cross section to meet the needs of super high structures increases the self-weight, forming a vicious cycle of increasing material consumption, decreasing space utilization and amplifying seismic response; 4) during construction, the lack of effective restraint tooling during UHPC pouring leads to excessive deformation of the steel plate surface, seriously affecting the structural precision and durability.

[0004] Therefore, how to design a new type of multi-cavity double-steel plate-UHPC composite structure and construction process that can overcome the above defects is a pressing problem to be solved. SUMMARY

[0005] To solve the problems in the prior art, the present application aims at providing a novel multi-cavity double-steel plate-UHPC composite structure and construction process, wherein the space between the double-steel plates is divided into multiple cavities by the open-hole longitudinal partition plate, the standardized steel-UHPC tenon connecting piece is formed by the penetrating steel bar, the fixing nut and the second steel bar hole, and the steel-concrete interface connecting mode is unified; meanwhile, the temporary tooling of the constraint steel plate and the constraint pull rod is used to control the pouring deformation.

[0006] The above technical purpose of the present application is achieved by the following technical scheme:

[0007] In a first aspect, a novel multi-cavity double-steel plate-UHPC composite structure is provided, comprising:

[0008] Steel wall plates, which are two steel structure plate members on the outside of the composite structure;

[0009] Open-hole longitudinal partition plates, which are spaced and welded on the steel wall plates and are provided with flow holes and second steel bar holes;

[0010] End plates, which are welded on the steel wall plates, are located at both ends of the arrangement direction of the open-hole longitudinal partition plates and are parallel to the open-hole longitudinal partition plates, and are provided with first steel bar holes;

[0011] Penetrating steel bars, which are inserted into the second steel bar holes and are fixed to the end plates by the first nuts;

[0012] UHPC, which is poured between the steel wall plates.

[0013] Further, the open-hole longitudinal partition plates are equally spaced and welded on the two steel wall plates, and the two steel wall plates are assembled and docked with each other to divide the single cavity surrounded by the two steel wall plates into multiple independent compartments.

[0014] Further, the flow holes are round-end rectangular holes, which are equally arranged on the open-hole longitudinal partition plates and are used for the mutual flow of the UHPC between different cavities during pouring.

[0015] Further, the second steel bar holes are circular holes, which are respectively arranged between the flow holes.

[0016] Further, a transverse partition plate or a transverse stiffening rib is arranged in a plane perpendicular to the plane of the steel wall plate and the plane of the open-hole longitudinal partition plate.

[0017] Further, the present application further comprises a constraint steel plate and a constraint pull rod, wherein the constraint steel plate is vertically arranged on the outside of the steel wall plate and closely adheres to the steel wall plate.

[0018] Further, the width of the constraint steel plate is greater than the width of the steel wall plate.

[0019] In a second aspect, a construction process of a new multi-cavity double-steel plate-UHPC composite structure is provided, which is used to realize the new multi-cavity double-steel plate-UHPC composite structure according to any one of the first aspect, and comprises the following steps:

[0020] S1: welding the perforated longitudinal partition plate and the end plate equidistantly on the steel wall plate;

[0021] S2: assembling the steel wall plates on both sides, and permanently fixing the end plate on one side of the steel wall plate to the other side of the steel wall plate by welding;

[0022] S3: inserting the through steel bar into the first steel bar hole and the second steel bar hole, and screwing the first nut to anchor the through steel bar to the end plate;

[0023] S4: pouring the UHPC between the steel wall plates;

[0024] S5: after the UHPC is finally cured, the composite structure is obtained according to the standard implementation of maintenance.

[0025] Further, the constraint steel plate and the constraint tie rod are installed before pouring the UHPC, and the constraint steel plate and the constraint tie rod are removed after the UHPC is finally cured.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] 1. The present application divides the space between the double steel plates into multiple cavities by using the perforated longitudinal partition plate, forms a standardized steel bar-UHPC tenon connecting piece through the through steel bar, the fixing nut and the second steel bar hole, and unifies the steel-concrete interface connecting method; at the same time, the temporary tooling of the constraint steel plate and the constraint tie rod is used to control the pouring deformation; the problems of non-uniform design of the interface connecting piece of the existing double-steel plate-UHPC composite structure, poor engineering applicability and the like are solved, and the adaptability to different load scenarios is enhanced, thereby providing a high-strength and high-toughness, simple structure solution for super-high buildings, large-span bridges and the like engineering;

[0028] 2. The present application realizes the formation of a multi-cavity double-steel plate-UHPC composite structure with different plate thicknesses through parameterized design combination by adjusting the spacing of the steel wall plates, the height of the perforated longitudinal partition plate and the arrangement number of the through steel bar. By using the fact that the strength / density ratio of UHPC is significantly higher than that of ordinary concrete, the cross-sectional size and the structure self-weight are greatly reduced under the premise of ensuring the bearing capacity, and the effect of flexibly adapting to diversified engineering needs is achieved, thereby solving the problems of cross-sectional size increase, self-weight increase and space utilization rate decrease caused by the use of ordinary concrete in the prior art;

[0029] 3、The present application forms a steel-UHPC tenon connector by setting different aperture steel bar holes and corresponding setting different diameter through steel bars, and setting a cross partition plate or a transverse stiffening rib in the direction perpendicular to the steel wall plate and the open hole longitudinal partition plate, and combining connection strengthening and rigidity enhancement, which significantly improves the static performance and construction efficiency compared with other connectors such as welded pegs and traditional PBL connectors, realizes the improvement of steel-concrete interface force transmission efficiency and the optimization of the overall stability of the structure, and achieves the effect of improving durability and seismic performance. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0031] Figure 1 It is a schematic diagram of a steel structure of the multi-cavity double steel plate-UHPC composite structure in the embodiment 1 of the present application;

[0032] Figure 2 It is a schematic diagram of a multi-cavity double steel plate-UHPC steel structure containing a restraint tool in the embodiment 1 of the present application;

[0033] Figure 3 It is a schematic diagram of a multi-cavity double steel plate-UHPC composite structure in the embodiment 2 of the present application;

[0034] Figure 4 It is a schematic diagram of a cross section of a multi-cavity double steel plate-UHPC composite structure in the embodiment 2 of the present application;

[0035] Markings in the drawings and corresponding names of parts:

[0036] 1, steel wall plate; 2, end plate; 21, first steel bar hole; 3, open hole longitudinal partition plate; 31, second steel bar hole; 32, flow hole; 4, through steel bar; 41, first nut; 5, restraint pull rod; 51, second nut; 6, restraint steel plate; 7, UHPC. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the embodiments and drawings, the illustrative embodiments of the present application and the description thereof are only used to explain the present application, and do not limit the present application.

[0038] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component.

[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified.

[0041] Embodiment 1: A new type of multi-cavity double steel plate-UHPC composite structure, as shown in Figure 1 and Figure 2 It comprises a steel wall plate 1, an open hole longitudinal partition plate 3, an end plate 2, a through steel bar 4, a first nut 41, a constraint pull rod 5, a second nut 51, a constraint steel plate 6 and UHPC 7.

[0042] Among them, the steel wall plate 1 is two steel structure plate pieces on the outside of the composite structure.

[0043] Considering that the prior art usually uses studs, tensioned steel bars, channel steels and the like as steel-concrete interface connecting pieces, there are problems such as complex construction, poor adaptability to composite plates of different thicknesses, and difficulty in regulating the width-thickness ratio of the steel wall plate 1, etc. The present application designs an open hole longitudinal partition plate 3, which is a steel structure plate piece, and is welded on the two side steel wall plates 1 at equal intervals according to the stress needs, dividing the composite plate into a multi-chamber structure. This multi-chamber structure can improve the buckling resistance of the steel wall plate 1 by regulating the width-thickness ratio of the steel wall plate 1, and can improve the constraint effect of steel on UHPC, further strengthening the steel-concrete composite effect, and effectively improving the compressive mechanical properties of the composite plate.

[0044] In order to regulate the width-thickness ratio of the inner and outer steel wall plates, effectively improve the buckling resistance of the steel wall plate and the steel-concrete composite effect, the present application designs an open hole longitudinal partition plate 3, which is a steel structure plate piece, and is welded on the steel wall plate 1 at equal intervals, dividing the tower wall into multiple cells. Among them, the double steel plate-UHPC structure of the multi-cell can be equivalent to several steel pipe-UHPC columns in stress, and compared with the existing single-chamber steel plate UHPC technology, the width-thickness ratio of the steel wall plate is smaller, the buckling resistance is stronger, the steel-concrete composite effect is stronger, and the mechanical properties under load are better.

[0045] The height of the open hole longitudinal partition plate 3 is equal to the distance between the two side steel wall plates 1, and the open hole longitudinal partition plate 3 is provided with flow holes 32 and second steel bar holes 31. The flow holes 32 are round-end rectangular holes, which can be used for the UHPC 7 to flow between the cells when pouring the UHPC 7 between the two side steel wall plates 1. The second steel bar holes 31 are circular holes, which are used for the penetrating steel bars 4 to pass through. The height of the open hole longitudinal partition plate 3 refers to the height of the open hole longitudinal partition plate 3 in the direction parallel to the constraint pull rod 5.

[0046] The end plate 2 is a steel structure plate, which is located at both ends of the arrangement direction of the open hole longitudinal partition plate 3 and is parallel to the open hole longitudinal partition plate 3, and is welded on the two side steel wall plates 1. The end plate 2 is provided with first steel bar holes 21, which are circular holes and are used for the penetrating steel bars 4 to pass through. The end plate 2 is used for fixing the penetrating steel bars 4 and forming a closed section to pour the UHPC 7.

[0047] The penetrating steel bars 4 adopt a transverse design. When the traditional double steel plate-concrete structure is applied to the bridge tower, longitudinal steel bars are usually arranged to form a reinforced concrete structure to bear pressure. However, the connection process of the longitudinal steel bars is relatively complex and low in work efficiency in actual engineering application. However, the use of the UHPC 7 can greatly improve the pressure bearing efficiency, and the longitudinal steel bars can not be arranged for bearing stress, which also brings high efficiency in construction.

[0048] The penetrating steel bars 4 are provided with threaded sections at both ends, which pass through the second steel bar holes 31 of the open hole longitudinal partition plate 3 and are anchored to the two side end plates 2. The first nuts 41 are screwed into both ends of the penetrating steel bars 4, respectively, so as to fix the penetrating steel bars 4 on the end plates 2. The penetrating steel bars 4 and the circular holes on the open hole longitudinal partition plate 3 form a steel-UHPC tenon connector, which further strengthens the steel-UHPC combination effect and solves the problems of the traditional shear connector in the existing double steel plate-concrete structure, such as complex structure, difficult construction, poor adaptability to different thicknesses of the combined plate, and inconsistent design.

[0049] Since the UHPC 7 has a high strength / weight ratio, which is about 2-4 times that of ordinary concrete, the member cross-sectional size and self-weight can be significantly reduced. Therefore, the UHPC 7 is used to pour between the two side steel wall plates 1 to form a multi-cavity double steel plate-UHPC combined structure. The UHPC 7 mainly bears the pressure load, which improves the bearing efficiency and makes the structure lightweight, and is especially suitable for the design of structures with high seismic fortification requirements.

[0050] In some examples, the multi-cavity double steel plate-UHPC combined structure with different plate thicknesses can be formed by adjusting the distance between the two side steel wall plates 1, the height of the open hole longitudinal partition plate 3 and the arrangement number of the penetrating steel bars 4.

[0051] In some examples, the second steel bar holes 31 with different hole diameters can be arranged on the open hole longitudinal partition plate 3, and the penetrating steel bars 4 with different diameters can be correspondingly arranged to form a steel-UHPC tenon connector.

[0052] In some examples, a transverse diaphragm or a transverse stiffening rib can be arranged in a direction perpendicular to the steel wall plate 1 and the open-hole longitudinal diaphragm 3.

[0053] The steel structure diagram of the multi-cavity double-steel plate-UHPC composite structure is shown in Figure 1 which is composed of two side steel wall plates 1, end plates 2 at both ends, and open-hole longitudinal diaphragms 3 welded at equal intervals on the steel wall plates 1.

[0054] As shown in Figure 2 , it also includes through steel bars 4, first nuts 41. The open-hole longitudinal diaphragm 3 is provided with second steel bar holes 31 and flow holes 32. The open-hole longitudinal diaphragm 3 divides the composite structure into multiple cavities, the flow holes 32 are used for the mutual flow of the cast UHPC 7 between different cavities, the second steel bar holes 31 are used for the insertion of the through steel bars 4, and the first nuts 41 anchor the through steel bars 4 to the end plates 2. After the steel structure part is assembled, the steel structure part is fixed by using the restraining tie bars 5, the second nuts 51 and the restraining steel plates 6 to prevent excessive out-of-plane deformation of the two side steel wall plates 1 during the casting of the UHPC 7.

[0055] The out-of-plane deformation occurs during the pouring of the UHPC 7, which is a geometric initial defect that significantly weakens the mechanical properties of the structure. Therefore, the restraining steel plates 6 and the restraining tie bars 5 are used to effectively limit the out-of-plane deformation of the two side steel wall plates 1 and minimize the geometric initial defect of the composite structure.

[0056] Overall, the open-hole longitudinal diaphragm 3 design with controllable construction parameters in the present application effectively improves the buckling resistance of the steel wall plate 1, and the steel bar-UHPC tenon connector on the longitudinal diaphragm strengthens the steel-concrete composite action, fully utilizing the mechanical performance advantages of the composite structure. The new multi-cavity double-steel plate-UHPC composite plate provided by the present application has the advantages of excellent mechanical properties, good durability, fast construction speed, etc., and is especially suitable for double-thin-wall bridge piers, box girders, box arches, cable-supported bridge towers, light bridge decks, and shear walls of high-rise buildings. The application of the composite plate is of great significance for further promoting the industrialization, assembly, and greenization of bridge and building structures, and helps the development of low-carbon sustainable construction technology.

[0057] Embodiment 2: A construction process of a new multi-cavity double-steel plate-UHPC composite structure, which is used to realize the new multi-cavity double-steel plate-UHPC composite structure in embodiment 1, comprising the following steps:

[0058] Weld the open-hole longitudinal baffle 3 and the end plate 2 equidistantly on the two side steel wall plates 1; assemble the two side steel wall plates 1, and weld the two end plates 2 on one side steel wall plate 1 on the other side steel wall plate 1; pass through the steel bar 4, and screw the first nut 41 on both sides to anchor the steel bar 4 on the end plate 2; install the constraint steel plate 6 and the constraint pull rod 5 to fix the steel structure part; the constraint steel plate 6 is a steel structure plate, which is tightly attached to the two side steel wall plates 1 respectively, the width of the constraint steel plate 6 should be greater than the width of the steel wall plate 1 to reserve space for setting the constraint pull rod 5 at both ends, and a round hole is arranged at the design position of the constraint pull rod 5; the constraint pull rod 5 is a steel pull rod, which is provided with a threaded section at both ends, and is anchored on the constraint steel plate 6 after passing through the round hole of the constraint steel plate 6, so as to form effective constraint on the steel structure part of the double-steel plate-UHPC combined structure; pour the UHPC 7 between the two side steel wall plates 1, remove the constraint tooling after the UHPC 7 is finally cured, and carry out standard curing or steam curing, so as to finally form a new type of multi-cavity double-steel plate-UHPC combined structure; wherein the constraint tooling includes the constraint pull rod 5, the second nut 51 and the constraint steel plate 6.

[0059] As shown in Figure 3 and Figure 4 Pour the UHPC 7, remove the constraint tooling after the UHPC 7 is finally cured, and carry out standard curing or steam curing, so as to finally form a new type of multi-cavity double-steel plate-UHPC combined structure; wherein the constraint tooling includes the constraint pull rod 5, the second nut 51 and the constraint steel plate 6.

[0060] After pouring the UHPC, the steel bar 4 and the second steel bar hole 31 form a steel bar UHPC tenon connecting piece, which effectively enhances the steel-concrete combined effect of the combined plate structure under load, and is the key to the combination effect.

[0061] The new type of multi-cavity double-steel plate-UHPC combined structure provided by the application can be applied to the following scenes:

[0062] When the thickness is small (usually <100mm, the light steel-concrete composite orthotropic bridge deck of the Nanjing Jinwen Road river-crossing channel adopts a standard section with a thickness of 80mm), it can be applied to the bridge deck of a large-span cable-supported bridge.

[0063] When the thickness is 100-600mm, it is suitable for large-span box-section continuous rigid frame bridges, box-shaped arch ribs and high-rise building shear wall structures.

[0064] When the thickness is 600-1000mm, it can be used for the tower column of a large-span cable-supported bridge.

[0065] When the thickness is greater than 1000mm, it can be used for double-thin-walled piers of a large-span high-pier bridge.

[0066] Working principle: the present application divides the space between the two steel wall plates into multiple chambers by the open hole longitudinal partition plate, uses the steel bar to pass through the hole of the open hole longitudinal partition plate and the end plate, and is anchored by the fixing nut to form a standardized steel-UHPC tenon joint, unifies the steel-concrete interface connection form and facilitates the parameter design and control of the connection structure; UHPC is used for pouring to form a high-strength and high-toughness composite structure, which significantly reduces the cross-sectional size and self-weight, and improves the compressive bending shear mechanical properties and adaptability of different load cases / plate thicknesses.

[0067] Those skilled in the art will appreciate that embodiments of the application can be supplied as methods, systems, or computer program products. Accordingly, the application can be embodied in the form of complete hardware embodiments, complete software embodiments, or embodiments combining software and hardware aspects. Furthermore, the application can be embodied in the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) having computer usable program code embodied therein.

[0068] The application is described with reference to the flowcharts and / or block diagrams according to the embodiments of the application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device that implements the flow Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the function specified in the flow or flows and / or block or blocks.

[0069] These computer program instructions can also be stored in a computer readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including instruction apparatus, which implements the flow Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the function specified in the flow or flows and / or block or blocks.

[0070] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable data processing apparatus to produce a computer-implemented process, so that the instructions executed on the computer or other programmable data processing apparatus provide a process for implementing the flow Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the function specified in the flow or flows and / or block or blocks.

[0071] The above detailed description of the specific embodiments of the present application is provided for the purpose of further explaining the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A novel multi-cavity double-steel plate-UHPC composite structure, characterized in that, include: Steel wall panel (1) consists of two steel structural plates on the outside of the composite structure; Perforated longitudinal diaphragms (3) are welded at intervals to the steel wall plate (1) and are provided with flow holes (32) and second reinforcing bar holes (31). End plate (2), welded to the steel wall plate (1), located at both ends of the arrangement direction of the perforated longitudinal partition plate (3) and parallel to it, and provided with first reinforcing bar hole (21). The steel bar (4) is inserted into the second steel bar hole (31) and fixed to the end plate (2) by the first nut (41). UHPC (7) is injected between the steel wall panels (1).

2. The novel multi-cavity double-steel plate-UHPC composite structure according to claim 1, characterized in that, The perforated longitudinal partition (3) is welded at equal intervals to the steel wall panels (1) on both sides, and the single chamber enclosed by the two steel wall panels (1) is divided into multiple independent compartments by assembling and connecting the two steel wall panels (1) together.

3. The novel multi-cavity double-steel plate-UHPC composite structure according to claim 1, characterized in that, The flow holes (32) are rectangular holes with rounded ends, and are arranged at equal intervals on the perforated longitudinal partition (3) to allow the UHPC (7) to flow between different chambers during injection.

4. The novel multi-cavity double-steel plate-UHPC composite structure according to claim 1, characterized in that, The second reinforcing bar hole (31) is a circular hole, which is respectively disposed between each of the flow holes (32).

5. The novel multi-cavity double-steel plate-UHPC composite structure according to claim 1, characterized in that, Transverse diaphragms or transverse stiffening ribs are provided in a plane perpendicular to the plane of the steel wall panel (1) and the plane of the perforated longitudinal diaphragm (3).

6. The novel multi-cavity double-steel plate-UHPC composite structure according to claim 1, characterized in that, It also includes a constraint steel plate (6) and a constraint tie rod (5), wherein the constraint steel plate (6) is vertically arranged on the outside of the steel wall panel (1) and is closely fitted to the steel wall panel (1).

7. A novel multi-cavity double-steel plate-UHPC composite structure according to claim 6, characterized in that, The width of the constraint steel plate (6) is greater than the width of the steel wall plate (1).

8. A construction process for a novel multi-cavity double-steel plate-UHPC composite structure, characterized in that, This construction process is used to realize a novel multi-cavity double steel plate-UHPC composite structure as described in any one of claims 1-7, and includes the following steps: S1: The perforated longitudinal partition (3) and the end plate (2) are welded at equal intervals to the steel wall plate (1); S2: Assemble both sides of the steel wall panel (1) and permanently fix the end plate (2) on one side of the steel wall panel to the other side of the steel wall panel by welding; S3: Insert the through steel bar (4) into the first steel bar hole (21) and the second steel bar hole (31), and screw in the first nut (41) to anchor the through steel bar (4) onto the end plate (2); S4: Inject the UHPC (7) between the steel wall panels (1); S5: After the UHPC (7) has set, the composite structure is obtained by curing according to the standard.

9. The construction process of a novel multi-cavity double-steel plate-UHPC composite structure according to claim 8, characterized in that, Before pouring the UHPC (7), install the constraint plate (6) and constraint rod (5), and remove the constraint plate (6) and constraint rod (5) after the UHPC (7) has set.

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