Construction method of concrete shear walls with precast reinforced steel frame and UHPC formwork

Abstract

This invention provides a construction method for a concrete shear wall using a precast steel reinforcement cage and UHPC formwork. The shear wall includes a steel reinforcement cage, a steel reinforcement connecting cage connecting two steel reinforcement cages, and a UHPC slab connected to the outer periphery of the steel reinforcement cage. Concrete is poured between the UHPC slabs. The connection points of the steel reinforcement cage are welded, allowing the entire steel reinforcement cage to bear force independently and strengthening the overall support strength. The welding of the steel reinforcement cages of the two edge members provides support when welding the main steel reinforcement cage in the middle part. UHPC has many advantages such as high strength, good durability, and good impermeability. Using it as a permanent formwork for the shear wall can effectively prevent cracks and corrosion. At the same time, by using factory prefabrication, the steel reinforcement cage and UHPC slab of the concrete shear wall are made into a whole. After hoisting and positioning on site, only the side formwork needs to be erected before direct pouring, greatly reducing the on-site construction process.

Description

Technical Field

[0001] This invention relates to the field of building technology, and more specifically, to a construction method for a concrete shear wall with a steel reinforcement frame and a UHPC formwork. Background Technology

[0002] Shear walls in building structures often experience complex stress conditions under combined bending and shear forces, necessitating reinforcement. This is typically achieved using edge-constrained components such as concealed columns or end columns to enhance seismic resistance. This results in a large number of reinforcement binding points, making construction extremely complex. After the reinforcement cage is bound, formwork must be erected on-site and concrete poured, leading to a massive workload and significantly impacting the construction schedule. Particularly problematic is the prefabrication of reinforcement cages in precast plants, which are large and difficult to transport and hoist during construction. Furthermore, existing cast-in-place concrete has relatively low overall load-bearing capacity and ductility, and is prone to cracking, requiring subsequent formwork removal. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a construction method for a concrete shear wall with a precast steel reinforcement frame and UHPC formwork, so as to solve the above problems.

[0004] The present invention adopts the following solution:

[0005] This application provides a precast reinforced concrete shear wall with a steel reinforcement frame and a UHPC formwork, including a steel reinforcement frame, a steel reinforcement connecting cage connecting the upper and lower layers of the steel reinforcement frame, and UHPC plates connected to both sides of the steel reinforcement frame; concrete is poured between the UHPC plates.

[0006] The steel reinforcement cage includes a main steel reinforcement cage, multiple connecting steel bars, and two edge component steel reinforcement cages; the main steel reinforcement cage is connected between the two edge component steel reinforcement cages; the connecting steel bars are connected to the main steel reinforcement cage in a direction perpendicular to the wall surface; the length of the connecting steel bars is greater than the width of the main steel reinforcement cage, and its two ends protrude outward to form a first connecting section for insertion into the UHPC plate; all connection points on the steel reinforcement cage are welded.

[0007] The steel reinforcement cage includes a plurality of long ring steel bars spaced laterally, and a first transverse bar welded to the middle of both sides of the long ring steel bars; when the upper and lower main steel reinforcement cages are connected through the steel reinforcement cage, the long ring steel bars on both sides of the first transverse bar are placed inside the steel reinforcement cage, and the end faces of the UHPC plates connected to the upper and lower steel reinforcement cages abut against each other.

[0008] Furthermore, the edge member reinforcement cage includes at least four pairs of first longitudinal bars spaced apart along the length of the wall, and multiple stirrups are welded longitudinally between two spaced first longitudinal bars.

[0009] Furthermore, the main steel reinforcement cage includes multiple pairs of second longitudinal bars spaced apart along the length of the wall, and second transverse bars welded longitudinally to the second longitudinal bars; the two sides of the second transverse bars are welded to the edge member steel reinforcement cage.

[0010] Furthermore, the two ends of the first transverse rib protrude outward to form a second connecting segment.

[0011] Furthermore, it also includes side formwork connected to both sides of the steel reinforcement frame.

[0012] A construction method for a concrete shear wall with a precast steel reinforcement cage and UHPC formwork, comprising the following steps:

[0013] S1: Precast steel reinforcement cage and steel connection cage;

[0014] The first longitudinal reinforcement and stirrups are welded together to form a columnar edge member reinforcement cage; the second longitudinal reinforcement, transverse reinforcement and connecting reinforcement are welded together to form the main reinforcement cage; then the edge member reinforcement cage and the main reinforcement are welded together to form a reinforcement skeleton.

[0015] Long ring-shaped steel bars and horizontal bars are welded together to form a steel bar connection cage;

[0016] S2: Prefabrication of UHPC board;

[0017] S3: The UHPC slab and steel reinforcement cage are assembled using a horizontal casting method;

[0018] The UHPC panels prefabricated in step S2 are assembled before initial setting. First, the steel reinforcement skeleton prefabricated in step S1 is hoisted so that one side of it lies on the first UHPC panel, and the first connecting section of that side is inserted into the first UHPC panel. After the first UHPC panel reaches the required solidification strength, the steel reinforcement skeleton is hoisted so that the other side of it, opposite the first UHPC panel, lies on the second UHPC panel, and the first connecting section of that side is inserted into the second UHPC panel. The factory prefabrication stage is completed after the solidification strength of the second UHPC panel reaches the required solidification strength.

[0019] S4: Install formwork on the sides of the steel reinforcement cage with UHPC slab assembled in step S3.

[0020] S5: Assemble the upper and lower parts of the prefabricated steel frame with UHPC plate in step S4.

[0021] First, the lower steel reinforcement cage is hoisted to the designated construction position. Then, the steel connection cage is placed inside the lower steel reinforcement cage so that the first horizontal bar is placed on the uppermost connecting bar of the lower steel reinforcement cage. Next, the upper steel reinforcement cage is hoisted so that the long ring bar on the upper side of the steel connection cage is placed inside the upper steel reinforcement cage so that the lower end face of the UHPC plate of the upper steel reinforcement cage abuts against the upper end face of the UHPC plate of the lower steel reinforcement cage.

[0022] S5: Pour concrete into the UHPC slab.

[0023] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0024] 1. Welding is used at the connection points of the steel reinforcement cage so that the entire steel reinforcement cage can bear the force independently;

[0025] 2. The welding of the steel reinforcement cages on the two edge members can provide support during the welding of the main steel reinforcement cage in the middle part;

[0026] 3. The installation of connecting steel bars can not only enhance the overall integrity of the steel reinforcement cage, but also embed them in the UHPC slab, making the UHPC slab and the steel reinforcement cage a better integrated whole;

[0027] 4. UHPC has many advantages such as high strength, good durability and good impermeability. Using it as a permanent formwork for shear walls can effectively prevent problems such as cracks and corrosion in shear walls.

[0028] 5. By using factory prefabrication, the steel reinforcement skeleton of the concrete shear wall is made into a whole with the UHPC slab. After being hoisted into place on site, only the side formwork needs to be erected before pouring can be done directly, which greatly reduces the on-site construction process. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the edge component steel cage of a concrete shear wall using a precast steel reinforcement frame and UHPC formwork according to the present invention.

[0031] Figure 2 This is a schematic diagram of the welded edge component steel cage and main steel cage of a concrete shear wall with a precast steel reinforcement frame and UHPC formwork according to the present invention.

[0032] Figure 3This is a schematic diagram of the steel reinforcement skeleton after the welding of the connecting steel reinforcement of a precast steel reinforcement skeleton and UHPC formwork for a concrete shear wall according to the present invention.

[0033] Figure 4 This is a schematic diagram of the first UHPC panel of a concrete shear wall constructed with a precast steel frame and UHPC formwork according to the present invention after casting and assembly.

[0034] Figure 5 This is a schematic diagram of the second UHPC panel of a concrete shear wall constructed using a precast reinforced steel frame and UHPC formwork, according to the present invention, after casting and assembly. Figure 1 ;

[0035] Figure 6 This is a schematic diagram of the second UHPC panel of a concrete shear wall constructed using a precast reinforced steel frame and UHPC formwork, according to the present invention, after casting and assembly. Figure 2 ;

[0036] Figure 7 This is a schematic diagram showing the side formwork of a concrete shear wall constructed using a precast steel reinforcement frame and UHPC formwork, as per the present invention, after its erection.

[0037] Figure 8 This is a schematic diagram of the connection between a precast steel reinforcement cage and a UHPC formwork for a concrete shear wall according to the present invention.

[0038] Figure 9 This is a schematic diagram of the assembly process of the upper and lower steel reinforcement skeletons of a concrete shear wall with a precast steel reinforcement skeleton and UHPC formwork according to the present invention.

[0039] Figure 10 This is a schematic diagram showing the completed assembly of the upper and lower shear wall steel reinforcement frame and formwork of a concrete shear wall using a precast steel reinforcement frame and UHPC formwork according to the present invention.

[0040] Icons: First longitudinal reinforcement 11, stirrup 12, second longitudinal reinforcement 21, second transverse reinforcement 22, connecting reinforcement 3, UHPC slab 4, side formwork 5, long ring reinforcement 62, first transverse reinforcement 61. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example

[0043] Combination Figures 1 to 10 As shown, this embodiment provides a concrete shear wall with a precast steel reinforcement skeleton and UHPC formwork, including at least two steel reinforcement skeletons, a steel reinforcement connecting cage connecting the upper and lower layers of the steel reinforcement skeletons, and a UHPC plate 4 connected to the outer periphery of the steel reinforcement skeletons; concrete is poured between the UHPC plates 4.

[0044] The steel reinforcement cage includes a main steel reinforcement cage, multiple connecting steel bars 3, and two edge component steel reinforcement cages; the main steel reinforcement cage is connected between the two edge component steel reinforcement cages; the connecting steel bars 3 are connected to the main steel reinforcement cage in a direction perpendicular to the wall surface; the length of the connecting steel bars 3 is greater than the width of the main steel reinforcement cage, and its two ends protrude outward to form a first connecting section that is inserted into the UHPC plate 4; all connection points on the steel reinforcement cage are welded.

[0045] The steel reinforcement connecting cage includes a plurality of long ring steel bars 62 arranged at transverse intervals, and a first transverse bar 61 welded to the middle of both sides of the long ring steel bars 62; when the upper and lower main steel reinforcement cages are connected through the steel reinforcement connecting cage, the long ring steel bars 62 on both sides of the first transverse bar 61 are placed inside the steel reinforcement connecting cage, and the end faces of the UHPC plates 4 connected to the upper and lower steel reinforcement connecting cages are exactly abutted.

[0046] Welding is used at the connection points of the reinforcing steel cage, allowing the entire cage to bear the load independently and strengthening the overall support. Welding of the reinforcing steel cages at the two edge members provides support during the welding of the main reinforcing steel cage in the middle section. UHPC has many advantages such as high strength, good durability, and good impermeability, and using it as a permanent formwork for shear walls can effectively prevent cracks and corrosion in the shear walls. At the same time, the reinforcing steel cage of the concrete shear wall and the UHPC slab 4 are made into a whole through factory prefabrication. After hoisting and positioning on site, only the side formwork 5 needs to be erected before direct pouring, which greatly reduces the on-site construction process.

[0047] Specifically, in this implementation, such as Figure 1 As shown, the edge member reinforcement cage includes four pairs of first longitudinal bars 11 spaced apart along the length of the wall, and multiple stirrups 12 are welded longitudinally between two spaced first longitudinal bars 11; this improves the seismic resistance of the shear wall and provides support during the welding of the main reinforcement cage in the middle section. Figure 2 and Figure 3 As shown, the main steel reinforcement cage includes multiple pairs of second longitudinal bars 21 spaced apart along the length of the wall, and second transverse bars 22 welded longitudinally to the second longitudinal bars 21; the two sides of the second transverse bars 22 are welded to the edge member steel reinforcement cage; multiple connecting bars 3 are evenly welded to the second transverse bars 22 in the transverse direction. The setting of the connecting bars 3 can not only strengthen the integrity of the steel reinforcement cage, but also be embedded in the UHPC plate 4, so that the UHPC plate 4 and the steel reinforcement cage can better become a whole.

[0048] like Figures 4 to 7 As shown, the UHPC panel 4 is assembled and connected to the reinforcing steel frame before initial setting. First, the reinforcing steel frame is hoisted so that one side of it lies upright on the first UHPC panel 4, and the first connecting section of that side is inserted into the first UHPC panel 4. After the first UHPC panel 4 reaches the required solidification strength, the reinforcing steel frame is hoisted so that the other side of it, opposite the first UHPC panel 4, lies upright on the second UHPC panel 4, and the first connecting section of that side is inserted into the second UHPC panel 4. The prefabrication is completed after the second UHPC panel reaches the required solidification strength.

[0049] like Figures 8 to 10As shown, the reinforcing cage includes multiple long ring-shaped reinforcing bars 62 spaced laterally, and first transverse reinforcing bars 61 welded to the middle of both sides of the long ring-shaped reinforcing bars 62. During assembly and connection of the upper and lower reinforcing cages, the first transverse reinforcing bars 61 are placed on the uppermost connecting reinforcing bar 3 of the lower reinforcing cage. During assembly, the long ring-shaped reinforcing bars 62 are inserted longitudinally into the upper and lower reinforcing cages respectively. This ensures the integrity of the upper and lower reinforcing cages after concrete pouring. Furthermore, the reinforcing cage design avoids the need to re-tie the reinforcing bars of the upper and lower layers during upper-layer construction, achieving a simple connection between the upper and lower shear walls, greatly facilitating the transportation of the shear wall's reinforcing cage, and also facilitating hoisting during on-site construction.

[0050] Furthermore, if the two sides of the reinforcing steel skeleton also use UHPC plates 4 as formwork, the two ends of the first transverse reinforcement 61 protrude outward to form second connecting sections, which are then inserted into the UHPC plate 4. Of course, in other embodiments, the two sides of the reinforcing steel skeleton can also be supported by side formwork 5 on the construction site. Finally, concrete is poured into the reinforcing steel skeleton within the UHPC plate 4.

[0051] The following describes in detail the construction method of concrete shear walls using precast steel reinforcement cages and UHPC formwork, including the following steps:

[0052] S1: Precast steel reinforcement cage and steel connection cage;

[0053] The first longitudinal reinforcement 11 and the stirrup 12 are welded together to form a columnar edge member reinforcement cage; the second longitudinal reinforcement 21, the transverse reinforcement and the connecting reinforcement 3 are welded together to form the main reinforcement cage; then the edge member reinforcement cage and the main reinforcement are welded together to form a reinforcement skeleton.

[0054] The long ring-shaped steel bar 62 and the horizontal bar are welded together to form a steel bar connection cage;

[0055] S2: Prefabrication of UHPC board 4;

[0056] S3: The UHPC slab 4 and the steel reinforcement cage are assembled using a horizontal casting method;

[0057] The UHPC slab 4 prefabricated in step S2 is assembled before initial setting. First, the steel reinforcement skeleton prefabricated in step S1 is hoisted so that one side of it lies on the first UHPC slab 4, and the first connecting section of that side is inserted into the first UHPC slab 4. After the first UHPC slab 4 reaches the required solidification strength, the steel reinforcement skeleton is hoisted so that the other side of it, opposite the first UHPC slab 4, lies on the second UHPC slab 4, and the first connecting section of that side is inserted into the second UHPC slab 4. The factory prefabrication stage is completed after the solidification strength of the second UHPC slab reaches the required solidification strength.

[0058] S4: Install formwork on the sides of the steel reinforcement frame with UHPC plate 4 assembled in step S3.

[0059] S5: Assemble the upper and lower parts of the prefabricated steel frame with UHPC plate 4 in step S4.

[0060] First, the lower steel reinforcement cage is hoisted to the designated construction position. Then, the steel connection cage is placed inside the lower steel reinforcement cage so that the first horizontal bar 61 is erected on the uppermost connecting bar 3 of the lower steel reinforcement cage. Next, the upper steel reinforcement cage is hoisted so that the long ring bar 62 on the upper side of the steel connection cage is placed inside the upper steel reinforcement cage so that the lower end face of the UHPC plate 4 of the upper steel reinforcement cage abuts against the upper end face of the UHPC plate 4 of the lower steel reinforcement cage.

[0061] S5: Pour concrete into the UHPC board 4.

[0062] It should be noted that if the UHPC plates 4 are also used as formwork for both sides of the steel reinforcement cage, then in step S2, after the solidification strength of the second UHPC formwork reaches the required level, the assembly of the UHPC plates 4 on both sides of the steel reinforcement cage can continue, and there is no need to perform formwork for the sides of the steel reinforcement cage in step S4.

[0063] Meanwhile, the steel reinforcement skeleton of the concrete shear wall and the UHPC slab 4 are made into a whole by factory prefabrication. After being hoisted into place on site, only the side formwork 5 needs to be erected before pouring can be carried out directly, which greatly reduces the on-site construction process. The UHPC slab 4 also does not need to be demolded later, saving time and effort.

[0064] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of the present invention are within the scope of protection of the present invention.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A construction method for a concrete shear wall using precast steel reinforcement cages and UHPC formwork, wherein the concrete shear wall comprises at least two steel reinforcement cages, characterized in that... It also includes a steel connecting cage connecting the two steel reinforcement cages, and UHPC plates connected to both sides of the steel reinforcement cages; concrete is poured between the UHPC plates. The steel reinforcement cage includes a main steel reinforcement cage, multiple connecting steel bars, and two edge component steel reinforcement cages; the main steel reinforcement cage is connected between the two edge component steel reinforcement cages; the connecting steel bars are connected to the main steel reinforcement cage in a direction perpendicular to the wall surface; the length of the connecting steel bars is greater than the width of the main steel reinforcement cage, and its two ends protrude outward to form a first connecting section for insertion into the UHPC plate; all connection points on the steel reinforcement cage are welded. The steel reinforcement cage includes a plurality of long ring steel bars spaced laterally, and a first transverse bar welded to the middle of both sides of the long ring steel bars; when the upper and lower main steel reinforcement cages are connected through the steel reinforcement cage, the long ring steel bars on both sides of the first transverse bar are placed inside the steel reinforcement cage, and the UHPC plate end faces connected to the upper and lower steel reinforcement cages abut against each other. The construction method includes the following steps: S1: Precast steel reinforcement cage and steel connection cage; The first longitudinal reinforcement and stirrups are welded together to form a columnar edge member reinforcement cage; the second longitudinal reinforcement, transverse reinforcement and connecting reinforcement are welded together to form the main reinforcement cage; then the edge member reinforcement cage and the main reinforcement are welded together to form a reinforcement skeleton. Long ring-shaped steel bars and horizontal bars are welded together to form a steel bar connection cage; S2: Prefabrication of UHPC board; S3: The UHPC slab and steel reinforcement cage are assembled using a horizontal casting method; The UHPC panels prefabricated in step S2 are assembled before initial setting. First, the steel reinforcement skeleton prefabricated in step S1 is hoisted so that one side of it lies on the first UHPC panel, and the first connecting section of that side is inserted into the first UHPC panel. After the first UHPC panel reaches the required solidification strength, the steel reinforcement skeleton is hoisted so that the other side of it, opposite the first UHPC panel, lies on the second UHPC panel, and the first connecting section of that side is inserted into the second UHPC panel. The factory prefabrication stage is completed after the solidification strength of the second UHPC panel reaches the required solidification strength. S4: Install formwork on the sides of the steel reinforcement cage with UHPC slab assembled in step S3. S5: Assemble the upper and lower parts of the prefabricated steel frame with UHPC plate in step S4. First, the lower steel reinforcement cage is hoisted to the designated construction position. Then, the steel connection cage is placed inside the lower steel reinforcement cage so that the first horizontal bar is placed on the uppermost connecting bar of the lower steel reinforcement cage. Next, the upper steel reinforcement cage is hoisted so that the long ring bar on the upper side of the steel connection cage is placed inside the upper steel reinforcement cage so that the lower end face of the UHPC plate of the upper steel reinforcement cage abuts against the upper end face of the UHPC plate of the lower steel reinforcement cage. S6: Pour concrete into the UHPC slab.

2. The construction method of the concrete shear wall with precast steel reinforcement frame and UHPC formwork according to claim 1, characterized in that, The edge member reinforcement cage includes at least four pairs of first longitudinal bars spaced apart along the length of the wall, and multiple stirrups are welded longitudinally between two spaced first longitudinal bars.

3. The construction method of the concrete shear wall with precast steel reinforcement frame and UHPC formwork according to claim 2, characterized in that, The main steel reinforcement cage includes multiple pairs of second longitudinal bars spaced apart along the length of the wall, and second transverse bars welded to the second longitudinal bars at intervals along the longitudinal direction; the two sides of the second transverse bars are welded to the edge member steel reinforcement cage.

4. The construction method of the concrete shear wall with precast steel reinforcement frame and UHPC formwork according to claim 1, characterized in that, The two ends of the first transverse rib protrude outward to form a second connecting section.

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