UHPC (Ultra High Performance Concrete) reinforced large-opening heat-insulating multi-ribbed composite shear wall structure and manufacturing method

Abstract

The invention provides a heat-preservation multi-ribbed composite shear wall structure adopting ultra-high performance concrete (UHPC) to prefabricate a reinforced frame in a large holed area and a construction method of the heat-preservation multi-ribbed composite shear wall structure. According to the structure, a prefabricated UHPC reinforcing frame unit is arranged on the edge of a hole and reliably connected with a double-layer concrete panel and a dense rib heat preservation frame through concave-convex groove rabbets, shear teeth are arranged in grooves, outwards-extending steel bars are embedded in the grooves, and an enhanced hole stress edge area is constructed. The UHPC reinforced frame has the characteristics of high strength and high toughness, and adopts a gradient transition design with a common concrete wallboard, so that the problems of stiffness mutation and stress concentration of the hole are effectively relieved, initial cracking of the crack is delayed, and the toughness and durability of the structure are improved. The structure is high in prefabrication degree, the traditional ribbed beam thickening requirement is omitted, the light weight degree and the transportation and hoisting efficiency of the wall body are remarkably improved, and the industrial assembly type construction requirement is met. And meanwhile, the structure performance and the heat preservation integrated effect are considered, and the structure is suitable for building envelope systems with large holes in high-rise residences and public buildings.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building structure engineering, and particularly relates to a UHPC reinforced large-opening thermal insulation ribbed composite shear wall structure and a manufacturing method. BACKGROUND

[0002] With the wide promotion of prefabricated building technology, the thermal insulation integrated concrete shear wall structure has been widely used in prefabricated residential buildings, public buildings and other fields due to its excellent energy-saving performance and structural integration advantages. As an important component of the system, the thermal insulation ribbed composite shear wall is composed of double-sided concrete panels and sandwiched ribbed thermal insulation components, has the characteristics of light weight, high strength, superior stiffness-weight ratio and good enclosure function, and can effectively improve the comprehensive performance of the building enclosure structure, while meeting the requirements of structural safety and energy saving and environmental protection.

[0003] However, with the increasing complexity of building space function requirements, large-sized door and window openings need to be set in the wall to meet the diversified use functions such as lighting, ventilation, traffic and equipment shaft. However, the setting of the openings destroys the original stress continuity of the ribbed frame, resulting in significant weakening of the overall stiffness and bearing capacity of the opening area. Under the action of repeated loads such as earthquakes, cracks are easily concentrated in this area, the corner shear failure or even local instability occurs, which becomes a weak link of the structure.

[0004] Especially when a large opening is set in the wall, the ribbed beams on the upper and lower sides of the opening and the corner areas are more prone to cracking, sliding and shear failure due to stress concentration. In addition, the cracks often extend to the inside of the sandwiched insulation layer, causing the insulation material to break or fall off, affecting the thermal performance and enclosure safety of the building.

[0005] In existing engineering practice, the opening area is mainly treated by local reinforcement in the following ways: (1) Increasing the steel bars around the opening to form an enhanced area; (2) Thickening the edge beam and edge column components of the opening to form a concealed coupling beam or a reinforced ring beam; (3) Using steel cages or local steel mesh to improve the connection stiffness and ductility of the opening.

[0006] Although the above measures improve the local bearing capacity of the opening area to some extent, there are still the following problems: (1) The construction of the increased steel bars is complex, the steel bars are prone to congestion, and the construction quality is difficult to guarantee; (2) In order to meet the stress and bar distribution requirements, the ribbed beam section often needs to be thickened, which significantly increases the self-weight of the wall, reduces the advantages of "light weight and high efficiency" of the prefabricated structure, and is not conducive to the hoisting, transportation and standardized modulus design of the components; (3) The ordinary concrete reinforced area cannot effectively inhibit the crack propagation, the interface shear resistance is insufficient, and the seismic toughness is limited; (4) The stiffness and material continuity at the opening are interrupted, stress concentration areas are easily formed, the structural ductility is insufficient, and early cracking of cracks occurs; (5) The existing strengthening measures lack systematic consideration of the integrated performance of the opening structure and the thermal insulation system, affecting the building energy saving effect and the structural integrity.

[0007] Therefore, it is urgent to provide a large-opening shear wall reinforced structure and construction method with high strength and toughness, good structural coordination and assembly efficiency, to realize the coordinated improvement of seismic performance, thermal performance and assembly efficiency, and meet the development needs of new prefabricated structure systems. SUMMARY

[0008] The purpose of the present application is to provide a UHPC reinforced large-opening thermal insulation ribbed composite shear wall structure and manufacturing method, by setting a high-strength UHPC reinforced edge frame in the opening area, and reliably connecting with the surrounding ribbed frame structure, forming a locally stiffened "composite reinforced frame", effectively improving the crack resistance, shear resistance and durability of the opening part of the shear wall, realizing the unity of material partition coordination and structural integrity, and suitable for large-scale production and installation of industrialized prefabricated components.

[0009] To achieve the above purpose, the present application provides the following technical scheme:

[0010] A UHPC reinforced large-opening thermal insulation ribbed composite shear wall structure, comprising: an inner concrete panel, an outer concrete panel, a ribbed thermal insulation frame, an opening, and a UHPC reinforced edge frame unit; Wherein: The ribbed thermal insulation frame is located between the inner concrete panel and the outer concrete panel, and forms a lattice structure by interlacing longitudinal rib columns and transverse rib beams, and the lattice structure is filled with thermal insulation material; The opening is arranged in the wall body, and the UHPC reinforced edge frame unit is arranged along at least three sides of the opening; The UHPC reinforced edge frame unit is a prefabricated ultra-high performance concrete component, and is connected with the ribbed thermal insulation frame by a concave-convex groove joint, comprising two connecting convex parts in contact with the edges of the inner concrete panel and the outer concrete panel, and a reinforcing concave part between the two connecting convex parts in contact with the longitudinal rib column or the transverse rib beam; A plurality of external reinforcing steel bars are embedded in the reinforcing concave part, and the external reinforcing steel bars are connected with the stress steel bars in the ribbed thermal insulation frame; The inner side surfaces of the two connecting convex parts and the top surface of the reinforcing concave part form an anchoring groove inner wall, and a plurality of shear teeth are arranged on the anchoring groove inner wall.

[0011] Further, when the opening is a window opening, the UHPC reinforced edge frame unit is arranged along the four sides of the opening, and when the opening is a door opening, the UHPC reinforced edge frame unit is arranged only along the top and the left and right three sides of the opening.

[0012] Further, the overall thickness of the UHPC reinforced frame unit is consistent with the thickness of the wallboard, and the thickness of the connecting convex part is consistent with the thickness of the inner and outer concrete panels.

[0013] Further, the size tolerance of the concave-convex groove rabbet interface between the UHPC reinforced frame unit and the dense rib insulation frame is controlled within ±1mm, and the concave-convex groove rabbet structure is a rectangular rabbet structure or a dovetail structure.

[0014] Further, the external steel bar is connected with the stress steel bar in the longitudinal rib column or the transverse rib beam by mechanical sleeve connection, welding connection or binding connection.

[0015] Further, the shear teeth are a groove structure preformed by a mold, a protruding tooth structure or a rough structure obtained by mechanical treatment on the inner wall of the reinforced recess.

[0016] Further, the insulation material is polystyrene foam, rock wool or phenolic foam material.

[0017] The application also provides a manufacturing method of the shear wall structure, comprising the following steps:

[0018] S1: manufacturing a UHPC reinforced frame unit, comprising:

[0019] S11: determining the outer contour size of the UHPC reinforced frame unit and the structure size of the connecting convex part and the reinforced recess according to the preset opening size;

[0020] S12: embedding an external steel bar in the reinforced recess, and controlling the steel bar arrangement precision by using a positioning device;

[0021] S13: setting shear teeth in the reinforced recess, wherein the shear teeth are a preformed structure or a rough interface formed by mechanical treatment;

[0022] S14: pouring UHPC material into the mold, and ensuring the compactness of the concrete by using vibration, and curing to form a preformed reinforced frame;

[0023] S15: demolding after curing, and checking the component size and appearance quality;

[0024] S2: installing the UHPC reinforced frame unit in the preset opening position of the wall formwork, so that the groove opening faces away from the center of the opening, and fixing and positioning by using a limiting device;

[0025] S3: manufacturing a wall main structure, comprising:

[0026] S31: arranging the panel steel bar net of the inner concrete panel in the formwork and pouring the inner concrete panel;

[0027] S32: filling the thermal insulation material in the ribbed thermal insulation frame lattice;

[0028] S33: arranging the stress steel bars in the ribbed thermal insulation frame, and connecting the external steel bars in the UHPC reinforced frame unit with the stress steel bars, and then arranging the panel steel bar mesh of the outer concrete panel;

[0029] S34: pre-wetting the reinforcing recesses of the UHPC reinforced frame unit before pouring, and then pouring the longitudinal rib columns, the transverse rib beams and the outer concrete panel in layers, and ensuring that the concrete fills the anchoring groove area in the UHPC reinforced frame unit during the vibrating process.

[0030] S35: after the concrete pouring is completed, the whole wall is covered and maintained; after the maintenance reaches the design age, the formwork is removed, and the structure component forming is completed.

[0031] Compared with the prior art, the beneficial effects brought by the present application are:

[0032] (1) significantly improving the overall bearing performance of the opening part: the prefabricated UHPC reinforced frame unit is arranged around the wall body with a large opening, and through the mechanical engagement connection with the inner and outer concrete panels and the steel bar docking with the rib columns and the rib beams, a closed force frame is formed, which can effectively enhance the ability of the opening area to resist earthquake action and vertical load, and significantly reduce the risk of local stress concentration and damage.

[0033] (2) good crack control ability: the arrangement of the UHPC reinforced frame unit can effectively inhibit the stress concentration and early crack development of the opening edge, delay the initial cracking time of the crack, and improve the durability and safety redundancy of the structure under repeated loads such as earthquakes.

[0034] (3) enhancing the bonding and shear performance of the interface between UHPC and ordinary concrete: in the existing opening wall, the bonding force between ordinary concrete and reinforced components is often insufficient due to the smooth interface, which is prone to slip and cracking. The present application provides macro mechanical engagement through "concave-convex groove rebate", realizes internal force flow continuity through "external steel bars", and enhances micro interface bonding through "shear teeth". The three mechanisms jointly act on different scales to form a complete interface shear and force transmission system. The combination effectively solves the technical problem that the interface between high-strength materials and ordinary concrete is prone to peeling and slipping due to large stiffness difference, and ensures that the opening area can deform and work together when stressed, improving the integrity and seismic toughness of the structure.

[0035] (4) Improve the material coordination and partition load bearing capacity: the present application sets the concrete section in the hole to the edge of the wall region, that is, from the UHPC full section at the hole position, gradually transitions to the UHPC and ordinary concrete mixed section, and finally transitions to the ordinary concrete full section, so as to realize the continuous transition of the material strength in the wall body. This gradient configuration avoids the stress concentration problem caused by the sudden change of the interface stiffness, improves the overall deformation coordination and durability of the structure under load, and is beneficial to improve the bearing stability and ductility performance of the wall under complex load such as earthquake. At the same time, UHPC and ordinary concrete are distributed in the wall in turn, which fully plays the performance advantages of different materials and improves the overall wallboard load bearing capacity.

[0036] (5) Suitable for assembly construction, improve construction efficiency and precision: the traditional hole reinforcement is mostly "post-reinforcement" or "thickening" idea, which often sacrifices the lightweight and thermal continuity of the wall. The UHPC reinforced frame unit (5) of the present application is designed as a prefabricated component with the same thickness as the wallboard, and the integrated structure of the "connecting convex part" and the "reinforcing concave part" makes it possible to balance high strength reinforcement and standard wall thickness. This structure is once formed in the factory, and the precise assembly and efficient construction can be realized by simply positioning the concave-convex groove and butt jointing the steel bars on site, which simplifies the hole structure processing flow and improves the construction quality. This "prefabricated equal thickness integrated reinforcement" design avoids the weight increase and construction complexity caused by the traditional thickening scheme, and realizes the coordinated optimization of "high strength", "lightweight" and "construction convenience".

[0037] (6) Ensure the continuity and integrity of the wall thermal insulation system: the UHPC reinforced frame unit (5) of the present application is only arranged at the edge of the hole, without intrusion into the filling area of the thermal insulation material (33) in the middle of the ribbed thermal insulation frame (3), and the continuity of the thermal insulation layer is perfectly maintained. This "edge reinforcement, middle insulation" partition design makes it possible to satisfy the structural performance enhancement and building energy saving requirements at the same time without interference, solving the contradiction that the traditional reinforcement method often destroys the integrity of the thermal insulation layer.

[0038] In summary, the present application effectively solves the problems of local damage and crack control of large opening wall structure, and takes into account the structural safety, construction convenience and energy saving performance, and has wide engineering application value. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a three-dimensional schematic view of the UHPC reinforced large opening thermal insulation ribbed composite shear wall structure of the present application;

[0040] Figure 2 is a sectional structure schematic view of the wall;

[0041] Figure 3A local enlarged view of the connection relationship of the UHPC reinforced edge frame unit and the dense rib frame;

[0042] Figure 4 A cross-sectional schematic view of the connection of the groove of the UHPC reinforced edge frame unit and the ordinary concrete; Figure 5 A wallboard manufacturing method of the UHPC reinforced large opening thermal insulation dense rib composite shear wall structure;

[0043] In the figure: 1-in page concrete panel; 2-out page concrete panel; 3-dense rib thermal insulation frame; 31-longitudinal rib column; 32-transverse rib beam; 33-thermal insulation material; 4-opening; 5-UHPC reinforced edge frame unit; 51-connection convex part; 52-reinforced concave part; 53-external reinforcement; 54-anchoring groove; 55-shear tooth DETAILED DESCRIPTION

[0044] In order to make the technical scheme of the present application more clear and complete, a UHPC reinforced large opening thermal insulation dense rib composite shear wall structure of the present application is described in detail below in combination with specific embodiments. It should be understood that the embodiments are only used to further illustrate the present application and do not constitute a limitation on the protection scope of the present application.

[0045] The present application provides a shear wall structure system suitable for large opening parts, especially suitable for reinforcing large area opening components such as door openings and window openings in assembled monolithic building structures. The core is to set a prefabricated UHPC reinforced edge frame unit, and to improve the seismic performance and structural integrity of the opening area through multiple connection mechanisms such as concave-convex groove rabbet, external reinforcement, shear tooth, etc.

[0046] Embodiment 1:

[0047] This embodiment is aimed at the case of window opening set in the middle or upper part of the wall, which has four-edge closed reinforcement requirement.

[0048] As shown in Figure 1 and Figure 2 , the shear wall structure includes an in page concrete panel 1, an out page concrete panel 2, and a dense rib thermal insulation frame 3 set between the two. The dense rib thermal insulation frame 3 is composed of longitudinal rib columns 31 and transverse rib beams 32 to form a lattice structure, and the lattice space is filled with thermal insulation material 33 to form the load-bearing and thermal insulation core layer of the wall.

[0049] A window opening 4 is set in the middle of the wall, and a prefabricated UHPC reinforced edge frame unit 5 is provided around it. The UHPC reinforced edge frame unit 5 includes a top edge frame, a bottom edge frame, and two left and right side edge frame components, which form a closed reinforcement frame. Each edge frame component is provided with a groove structure, the opening of which faces away from the window opening direction, and the inner wall of the groove is provided with a shear tooth 55 to enhance the mechanical interlocking performance between the UHPC reinforced edge frame unit 5 and the post-cast concrete.

[0050] Each UHPC reinforced frame unit includes two connecting protrusions 51 in contact with the panel and a reinforcing recess 52 in the middle. A plurality of external reinforcing bars 53 are arranged in the reinforcing recess 52 to form an integrated force system with the force-bearing reinforcing bars. The connecting protrusions 51 and the reinforcing recess 52 together form an anchoring groove 54, which can be filled and compacted during concrete pouring, thereby improving the interface shear and anchoring performance.

[0051] The frame members on the four sides of the window opening 4 are connected by tongue-and-groove engagement, reinforcing bar insertion or welding positioning, so that they form a closed force frame during overall pouring, thereby significantly enhancing the shear stiffness and crack control ability of the opening area.

[0052] Preferably, to ensure the installation accuracy and overall structural coordination of the UHPC reinforced frame unit 5 in the wall, the overall thickness of the UHPC reinforced frame unit 5 is set to be consistent with the total thickness of the wall, thereby ensuring that the frame is flush with the inner concrete panel 1 and the outer concrete panel 2 after embedding, avoiding construction joint misalignment, and improving the continuity and aesthetics of the post-poured concrete. Further, the thickness of the connecting protrusion 51 is also preferably the same as the thickness of the inner concrete panel 1 and the outer concrete panel 2, so that it can form good adhesion and support at the panel part, enhancing the overall integrity after assembly and the pressure stability of the concrete surface layer.

[0053] Preferably, to ensure the assembly accuracy and mechanical properties of the connection part between the UHPC reinforced frame unit 5 and the dense rib insulation frame 3, the size tolerance of the concave-convex groove tongue-and-groove interface between them is controlled within ±1mm. Smaller interface tolerance can ensure good engagement and close effect during installation of the tongue-and-groove structure, avoiding joint misalignment, looseness or stress concentration.

[0054] Preferably, the concave-convex groove tongue-and-groove structure can be selected in various forms, including rectangular tongue-and-groove structure, dovetail structure or other mechanical connection structures with self-locking engagement function. Figure 3 As shown in Figure 3 a shows a rectangular tongue-and-groove structure, Figure 3 b shows a dovetail structure. By selecting different tongue-and-groove forms, the structural anti-slippage performance and shear connection strength can be flexibly matched according to the actual construction process.

[0055] Preferably, the insulation material 33 can be polystyrene foam EPS, rock wool or phenolic foam material, etc. These materials have the characteristics of light weight, low thermal conductivity, easy processing, etc., which can effectively improve the thermal performance and energy saving effect of the shear wall, meet the demand of green building standards. At the same time, it has good fire resistance and on-site construction adaptability.

[0056] Preferably, the embedded external reinforcement 53 in the UHPC reinforced edge frame unit 5 is connected to the stress reinforcement in the longitudinal rib column 31 or the transverse rib beam 32 in the dense rib insulation frame 3 by mechanical sleeve connection, welding connection or binding connection, etc. This design can ensure the mechanical continuity of the structural reinforcement, improve the overall collaborative stress capacity of the edge frame and the wall, and especially improve the ductility and toughness of the structure under the action of earthquake.

[0057] Preferably, the shear teeth 55 are groove structures, protruding teeth structures or rough structures obtained by mechanical processing of the inner wall of the recess 52, which are beneficial to enhance the interfacial shear resistance between the new and old concrete, improve the engagement effect and anti-peeling capacity of the overall structure, and further improve the anti-seismic and durability performance of the connection area.

[0058] Embodiment 2:

[0059] This embodiment is suitable for shear wall structures provided with floor-to-ceiling door openings or through-floor openings, especially for situations with high door opening repetition in industrialized prefabricated houses and modular unit buildings. In order to meet the connection requirements of the lower edge of the door opening with the floor or the threshold component, a three-edge reinforced UHPC reinforced edge frame is used, which simplifies the construction process while ensuring force transmission continuity.

[0060] As shown in Figure 4 , the shear wall includes an inner leaf concrete panel 1, an outer leaf concrete panel 2 and a dense rib insulation frame 3 therebetween, and a floor-to-ceiling door opening 4 is provided in the middle or lower part of the wall. The UHPC reinforced edge frame unit 5 is only arranged on the upper edge and the left and right sides of the opening, and no reinforcing component is arranged on the lower edge. The structure of the three-edge edge frame unit is basically the same as that of Embodiment 1, which includes a connecting protrusion 51, a reinforcing recess 52 and an anchoring groove 54, and a shear tooth 55 and an external reinforcement 53 are arranged in the recess for butt joint with the reinforcement in the rib column and rib beam of the wall.

[0061] During installation, the three-side edge frame unit is positioned at the pre-set position in the formwork, and is accurately matched with the dense rib frame through the concave-convex groove tenon. The structural space of the lower edge of the door opening without the UHPC reinforced edge frame unit can be cooperatively designed with the cast-in-place layer of the floor, the concrete threshold, the expansion joint assembly or the prefabricated door sleeve, and has good flexible structure integration capability.

[0062] Compared with the four-edge closed reinforcement scheme in Embodiment 1, the three-edge arrangement of the UHPC reinforced edge frame in Embodiment 2 ensures the continuity of the force transmission path on the upper part of the door opening while reducing the number of components, simplifying the formwork processing and improving the construction efficiency, thereby achieving an effective balance between structural performance and assembly construction, and being particularly suitable for efficient forming and structural connection of standardized door openings in industrialized prefabricated buildings.

[0063] The application also provides a wallboard manufacturing method of a UHPC reinforced large-opening thermal insulation dense-rib composite shear wall structure

[0064] The structures described in the above embodiments can be completed according to the following general construction process to form a structure, like Figure 5 The specific steps are as follows:

[0065] S1: prefabrication of the UHPC reinforced frame unit.

[0066] S11: according to the size of the preset door and window opening 4, the outer contour size (length, height, thickness) of the UHPC reinforced frame unit 5 is determined, and the structure parameters of the connecting convex part 51 and the reinforcing concave part 52 are determined at the same time. The thickness of the connecting convex part 51 is preferably consistent with the thickness of the inner leaf concrete panel 1 and the outer leaf concrete panel 2, and the depth and width of the reinforcing concave part 52 are determined according to the size of the rib column or rib beam to realize integrated connection of the structure. Based on the above size parameters, a steel mold or a plastic mold is made, and a corresponding concave-convex groove core is set to form a tongue-and-groove connection structure.

[0067] S12: according to the construction requirements, select the external steel bar 53 with appropriate diameter, anchoring length and connection mode, and reserve an anchoring section at the end of the steel bar, the length of which meets the lap joint or mechanical connection requirements of the stress steel bar. Set a steel bar positioning clamp or a limiting device in the mold to ensure the position accuracy of the steel bar and the thickness of the protective layer is not less than the design value, and complete the steel bar embedding.

[0068] S13: according to the stress and anti-skid design, the shape of the shear tooth 55 is determined as a groove type, a protruding tooth type or a roughened surface; when using mold forming, a tooth groove core or an embedded forming module is pre-installed on the inner wall of the mold to form a prefabricated shear tooth structure, and if using a post-processing method, mechanical scratching, roughing, sandblasting and other roughening treatments are performed on the inner wall of the concave part 52 after demolding to form an anti-skid interface with certain anchoring effect.

[0069] S14: pour the mixed UHPC mixture into the mold uniformly, layer by layer, and vibrate in time to ensure that the concrete is dense and fills the concave-convex structure and the gap between the steel bars; high-frequency vibration rods or pedestal vibration are used for auxiliary forming to avoid the appearance of honeycomb and rough surface. After pouring, the surface of the component is leveled and covered with a wet cloth or film for maintenance in time. After the specified curing period (such as 3 days of steam curing or 7 days of natural curing), demolding is performed, and the appearance and size of the component quality are accepted.

[0070] S2: installation of the UHPC reinforced frame unit.

[0071] Reserve the hole 4 position according to the design drawing in the wall mold, and set the installation limiting device corresponding to the UHPC reinforced frame unit 5. Hoist or place the cured UHPC reinforced frame unit 5 at the hole position, make it contact and fit with the positioning member inside the wall mold, and temporarily fix the reinforced frame through the screw rod, clamp or limiting block to prevent displacement of the reinforced frame in the subsequent concrete pouring process.

[0072] S3: Make the wallboard main structure.

[0073] S31: Arrange the panel steel bar mesh for forming the inner page concrete panel 1 on the inner wall of the mold, set the protective layer cushion block or support to ensure that the steel bar position and the protective layer thickness meet the specification requirements. Select the ordinary concrete with the strength grade not less than C30, and the moderate workability of the mixture. Pour the inner page concrete panel 1 from bottom to top in layers, and shake it in time to avoid vibration and segregation, so as to ensure that the concrete fully wraps the steel bar mesh and densely fills the inner panel area. The panel pouring thickness is consistent with the thickness of the connecting convex part 51 of the UHPC reinforced frame, so as to ensure that the steel bar mesh and the connecting convex part realize accurate lapping.

[0074] S32: After the inner page panel concrete pouring is completed and initial setting, fill the thermal insulation material 33 in the dense rib frame lattice, and the material can be selected from EPS board, rock wool or phenolic foam. Perform surface leveling treatment on the filled thermal insulation material, so as to facilitate the subsequent concrete pouring operation.

[0075] S33: Arrange the stress steel bars in the longitudinal rib column 31 and the transverse rib beam 32, and connect them with the external steel bars 53 pre-buried in the reinforced frame reinforcing recess 52 through mechanical connection, welding or binding, so as to ensure the stress continuity and anchoring strength. Then arrange the panel steel bar mesh required by the outer page concrete panel 2, and set the protective layer positioning member. After completion, perform overall inspection on the steel bar framework and thermal insulation frame, so as to ensure the accurate steel bar positioning and the compliance of the protective layer thickness.

[0076] S34: Before pouring the rib column and the rib beam, perform pre-wetting treatment on the interface of the reinforced frame reinforcing recess 52, so as to improve the interface bonding strength between the new and old concretes. Pour the longitudinal rib column 31, the transverse rib beam 32 and the outer page concrete panel 2 in turn by using the layering and partitioning pouring process. In the shear tooth 55 and the anchoring groove 54 area, use the fine vibration rod to locally insert and vibrate, so as to ensure that the interface concrete is fully filled.

[0077] S35: After the wall concrete overall pouring is completed, cover the wet cloth or plastic film for moisture curing, and remove the mold after curing to the design age such as 7 days. Check the appearance quality, size deviation and UHPC frame and wall connection compactness of the wallboard component.

[0078] In summary, the application provides a UHPC reinforced large-opening thermal insulation dense-rib composite shear wall structure, which combines the excellent strength and durability of UHPC material, and significantly improves the shear performance and crack control ability of the wall in the opening area through the effective connection of the prefabricated reinforcing frame unit and the cast-in-place dense-rib thermal frame, and improves the overall ductility and seismic performance of the component. The reinforcing frame adopts multiple structural measures such as concave-convex groove rabbet connection, external reinforcing steel bar butt joint and shear tooth interface anchoring, to ensure its cooperative work with the rest of the wall and form an efficient and stable force transmission path.

[0079] In addition, the construction method proposed by the application has clear structure and simple operation, is suitable for industrialized prefabrication and on-site assembly operation, and is particularly suitable for seismic reinforcement application of large-opening wall sections in high-rise residential buildings, public buildings and assembly type structure systems. Through different frame arrangement forms, it can adapt to various actual working conditions such as window openings and door openings, and has good engineering applicability and promotion prospect.

[0080] The above description is only used to illustrate and explain the technical solutions of the application, and does not make any form of limitation on the application. The above technical content can be changed, modified or modified, and any solution that does not deviate from the principle of the technical solutions of the application still belongs to the protection scope of the technical solutions of the application.

Claims

1. A UHPC-reinforced, large-aperture, thermally insulated, densely ribbed composite shear wall structure, characterized in that, include: Inner page concrete panel (1), outer page concrete panel (2), ribbed insulation frame (3), opening (4) and UHPC reinforced frame unit (5); in: The ribbed insulation frame (3) is located between the inner concrete panel (1) and the outer concrete panel (2), and is formed by the interlacing of longitudinal ribs (31) and transverse ribs (32) to form a lattice structure, which is filled with insulation material (33). The opening (4) is set in the wall, and UHPC reinforced frame units (5) are arranged along at least three sides of the opening (4); The UHPC reinforced frame unit (5) is a precast ultra-high performance concrete component, which is connected to the dense rib insulation frame (3) by tongue and groove joint. It includes two connecting protrusions (51) that contact and cooperate with the edges of the inner concrete panel (1) and the outer concrete panel (2), and a reinforcing recess (52) located between the two connecting protrusions (51) that contacts and cooperates with the longitudinal rib column (31) or the transverse rib beam (32). Multiple outward reinforcing bars (53) are pre-embedded in the reinforced recess (52), and the outward reinforcing bars (53) are connected to the reinforcing bars in the dense rib insulation frame (3); The inner wall of the anchoring groove (54) formed by the inner side of the two connecting protrusions (51) and the top surface of the reinforcing recess (52) is provided with multiple shear teeth (55).

2. The UHPC-reinforced large-aperture thermal insulation dense-ribbed composite shear wall structure according to claim 1, characterized in that: When the opening (4) is a window opening, the UHPC reinforced frame unit (5) is arranged in a fully enclosed manner around the opening. When the opening (4) is a door opening, the UHPC reinforced frame unit (5) is arranged only along the top and three sides of the opening.

3. The UHPC-reinforced large-aperture thermal insulation dense-ribbed composite shear wall structure according to claim 1, characterized in that: The overall thickness of the UHPC reinforced frame unit (5) is consistent with the thickness of the wall panel, and the thickness of the connecting protrusion (51) is consistent with the thickness of the inner page concrete panel (1) and the outer page concrete panel (2).

4. The UHPC-reinforced large-aperture thermal insulation dense-ribbed composite shear wall structure according to claim 1, characterized in that: The dimensional tolerance of the tongue and groove joint between the UHPC reinforced frame unit (5) and the dense rib insulation frame (3) is controlled within ±1 mm, and the tongue and groove joint structure is a rectangular tongue and groove structure or a dovetail joint structure.

5. The UHPC-reinforced large-aperture thermal insulation dense-ribbed composite shear wall structure according to claim 1, characterized in that: The extended reinforcing bars (53) are connected to the reinforcing bars in the longitudinal ribs (31) or transverse ribs (32) by means of mechanical sleeve connection, welding connection or binding connection.

6. The UHPC-reinforced large-aperture thermal insulation dense-ribbed composite shear wall structure according to claim 1, characterized in that: The shear teeth (55) are groove structures, protruding tooth structures, or rough structures obtained by mechanically processing the inner wall of the reinforced recess (52) through a mold.

7. The UHPC-reinforced large-aperture thermal insulation dense-ribbed composite shear wall structure according to claim 1, characterized in that: The insulation material (33) is polystyrene foam, rock wool or phenolic foam.

8. A method for fabricating a UHPC-reinforced large-aperture thermally insulated dense-ribbed composite shear wall structure, characterized in that, Includes the following steps: S1: Fabrication of UHPC reinforced bezel unit (5), including: S11: Based on the preset opening (4) size, determine the outer contour size of the UHPC reinforced frame unit (5) and the structural dimensions of the connecting protrusion (51) and the reinforcing recess (52); S12: Embed extended reinforcing bars (53) in the reinforced recess (52) and use a positioning device to control the accuracy of the reinforcing bar arrangement; S13: Shear teeth (55) are provided in the reinforced recess (52), wherein the shear teeth are pre-embedded molding structures or rough interfaces formed by mechanical processing; S14: Pour UHPC material into the mold and cure to form a prefabricated UHPC reinforced frame unit (5); S15: After curing, demold and check the dimensions and appearance quality of the components; S2: Install the UHPC reinforced frame unit (5) in the pre-set opening (4) position in the wall template, so that the groove opening faces away from the center of the opening (4), and fix it in place by the limiting device; S3: Construct the main wall structure, including: S31: Arrange the panel reinforcement mesh of the inner page concrete panel (1) in the template and pour the inner page concrete panel (1); S32: Fill the ribbed insulation frame with insulation material (33); S33: Arrange the reinforcing bars in the ribbed insulation frame (3), and connect the outward reinforcing bars (53) in the reinforcing frame to the reinforcing bars, and then arrange the panel reinforcement mesh of the outer concrete panel (2); S34: Before pouring, the reinforced recess (52) of the reinforced frame is pre-wetted, and then the longitudinal rib column (31), transverse rib beam (32) and outer concrete panel (2) are poured in layers. During the vibration process, the concrete is ensured to fill the anchor groove (54) area in the UHPC reinforced frame unit (5). S35: After the concrete is poured, the entire wall is covered and cured; after the curing reaches the design age, the formwork is removed and the structural components are formed.

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