Semi-assembled RPC-PC bundle shear wall and preparation method thereof

Abstract

The application relates to a semi-assembled RPC-PC bundle shear wall combined structure which comprises a lower end beam, a shear column and an upper end beam. The two ends of the shear column are fixedly connected with the lower end beam and the upper end beam respectively; the shear column comprises an active powder concrete outer mold and ordinary concrete filled in the internal space of the active powder concrete outer mold. The RPC-PC bundle shear wall utilizes the material advantages of RPC, can improve the stress performance and the anti-seismic performance of the shear wall, and can also improve the fire resistance, impact resistance and corrosion resistance of the shear wall. On the other hand, the RPC is prefabricated into the outer mold plate of the shear wall to form the RPC-PC bundle shear wall outer mold. The combined form can save a large amount of wood mold plates and steel mold plates, has a small influence on the surrounding environment, improves the work efficiency, can reduce the maintenance cost in the later period, and has a wide engineering application prospect.

Description

Technical Field

[0001] This invention relates to the field of concrete shear wall technology, specifically to a semi-prefabricated RPC-PC bundle shear wall composite structure and its preparation method. Background Technology

[0002] The rapid development of prefabricated buildings has had a significant impact on the construction industry. Prefabricated technology enables efficient use of resources and energy, offering advantages such as rapid construction, improved efficiency, controllable quality, and environmental protection. However, currently, most domestic concrete shear walls are constructed using traditional cast-in-place methods, requiring large quantities of wooden and steel formwork. This relatively crude production method results in substantial resource waste, contradicting the national advocacy of green ecology and sustainable development. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes a semi-prefabricated composite structure of reactive powder concrete (RPC) and plain concrete (PC) shear wall, the structure of which and its preparation method are described below.

[0004] A semi-prefabricated RPC-PC bundled shear wall includes a lower beam, a shear column, and an upper beam. The two ends of the shear column are fixedly connected to the lower beam and the upper beam, respectively. The shear column includes an active powder concrete outer formwork and plain concrete filling the internal space of the active powder concrete outer formwork.

[0005] RPC-PC bundled shear walls leverage the material advantages of RPC to improve the load-bearing and seismic performance of shear walls, while also enhancing their fire resistance, impact resistance, and corrosion resistance. Furthermore, prefabricating RPC into the outer formwork of the shear wall creates the RPC-PC bundled shear wall outer mold. This combination saves significant amounts of wood and steel formwork, minimizes environmental impact, improves work efficiency, and, most importantly, reduces subsequent maintenance costs, demonstrating broad prospects for engineering applications.

[0006] As a further improvement of the semi-prefabricated RPC-PC bundled shear wall of the present invention, the active powder concrete outer mold includes an outer frame and multiple partitions, each of the partitions being disposed in the inner space of the outer frame, dividing the inner space of the outer frame into multiple cavities, each cavity being filled with plain concrete.

[0007] As a further improvement to the semi-assembled RPC-PC bundled shear wall of the present invention, each of the partitions is provided with holes.

[0008] As a further improvement of the semi-prefabricated RPC-PC bundled shear wall of the present invention, the shear column is perpendicular to the lower beam and the upper beam; with the axis of the shear column as the longitudinal direction and the axes of the lower beam and the upper beam as the transverse direction, the shear column also includes multiple longitudinal steel bars and multiple stirrups; the longitudinal steel bars are embedded in the outer frame and partition body of the reactive powder concrete outer formwork; each stirrup is arranged transversely, and multiple stirrups tighten the multiple longitudinal steel bars in the cavity wall of each cavity from the upper end to the lower end.

[0009] As a further improvement to the semi-prefabricated RPC-PC shear wall of the present invention, both ends of each of the longitudinal steel bars extend into the lower end beam and the upper end beam, respectively.

[0010] As a further improvement to the semi-prefabricated RPC-PC shear wall of the present invention, a plurality of grouting corrugated pipes are provided in the lower end beam, and the lower end of a longitudinal steel bar is inserted into each grouting corrugated pipe and fixedly connected by the concrete filled in the grouting corrugated pipe.

[0011] As a further improvement to the semi-prefabricated RPC-PC shear wall of the present invention, the upper end of the longitudinal reinforcement is tied to the reinforcement in the upper beam and fixed to each other by plain concrete poured into the upper beam.

[0012] A method for fabricating a semi-assembled RPC-PC bundled shear wall, applied to the semi-assembled RPC-PC bundled shear wall as described above, includes the following steps:

[0013] First, prefabricate the lower beam, and pre-embed grouting corrugated pipes inside the lower beam;

[0014] 2. Process the active powder concrete outer mold. During construction, both ends of the longitudinal steel bars extend out of the active powder concrete outer mold. At the same time, holes are opened in the partition inside the active powder concrete outer mold. Finally, plain concrete is poured into the internal space of the active powder concrete outer mold and cured.

[0015] 3. After the curing time is over, pour concrete mortar into the pre-embedded corrugated grouting pipe, then insert the lower end of the longitudinal steel bar into the corrugated grouting pipe, and after curing, complete the assembly of the lower beam and the reactive powder concrete outer formwork.

[0016] 4. Tie the upper end of the longitudinal reinforcement to the reinforcement in the upper beam. After completion, pour plain concrete into the upper beam and cure to complete the preparation of the RPC-PC shear wall.

[0017] This method employs semi-prefabricated construction technology, which can save a significant amount of wooden and steel formwork, minimize the impact on the surrounding environment, improve work efficiency, and especially reduce subsequent maintenance costs. RPC-PC bundled shear walls not only quickly, simply, and efficiently meet building requirements, but also align with the national policy of "low-carbon, green, and environmentally friendly" construction, possessing broad prospects for engineering applications.

[0018] As a further improvement to the preparation method of the semi-prefabricated RPC-PC bundled shear wall of the present invention, step one specifically involves prefabricating the lower end beam in the prefabrication yard, including positioning the grouting corrugated pipe in advance when tying the reinforcing bars, for assembly with the upper shear column.

[0019] As a further improvement to the preparation method of the semi-prefabricated RPC-PC bundled shear wall of the present invention, step two, processing the active powder concrete outer mold includes: in the prefabrication yard, binding multiple longitudinal steel bars and multiple stirrups into a steel cage and placing it into the outer mold, with the two ends of the longitudinal steel bars extending out of the outer mold, and reserving a hole every 300mm for the middle partition, and finally pouring active powder concrete, and obtaining the active powder concrete outer mold after curing.

[0020] The technical advantages of this invention are as follows:

[0021] (1) The reinforced RPC is prefabricated into the outer formwork of the shear wall to form the outer formwork of the RPC-PC bundle shear wall. This combination can save a lot of formwork engineering. At the same time, the RPC bundle can act as steel, improving the load-bearing capacity and seismic performance of the composite shear wall.

[0022] (2) The use of reactive powder concrete (RPC) can improve the durability, corrosion resistance, fire resistance and erosion resistance of composite shear walls.

[0023] (3) The RPC-PC combined shear wall structure adopts grouting corrugated pipe connection, which is fast to construct, saves construction time, has little impact on the surrounding environment, and has controllable quality and high safety performance.

[0024] (4) The internal RPC bundle partition has reserved holes, which is conducive to the bonding between reactive powder concrete (RPC) and plain concrete (PC) and avoids the two from peeling off.

[0025] (5) RPC-PC bundled shear walls use only a small amount of RPC on the outside, with a thickness generally controlled between 25 and 50 mm, and a maximum of no more than 100 mm in actual projects, resulting in low cost. Based on the life-cycle cost of shear walls, RPC-PC combined shear walls have the advantages of being economical and reasonable, and effectively reducing the later maintenance costs of shear walls. Attached Figure Description

[0026] Figure 1This is a front-view sectional view of a semi-assembled RPC-PC bundled shear wall.

[0027] Figure 2 yes Figure 1 A top view of the AA section of a semi-assembled RPC-PC bundled shear wall.

[0028] Figure 3 yes Figure 1 A schematic diagram of pre-reserved holes on the partition plate in a semi-assembled RPC-PC bundled shear wall.

[0029] Attached reference numerals: 1. Longitudinal reinforcement; 2. Stirrup; 3. Reactive powder concrete outer formwork; 4. Plain concrete; 5. Lower extension section reinforcement; 6. Ultra-high performance concrete mortar; 7. Grouting corrugated pipe; 8. Upper beam; 9. Lower beam; 10. Partition; 11. Hole; 12. Upper extension section reinforcement. Detailed Implementation

[0030] 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 some embodiments of the present invention, not all embodiments. 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.

[0031] like Figures 1-2 As shown, a semi-prefabricated RPC-PC bundled shear wall includes a lower beam 9, a shear column, and an upper beam 8. The two ends of the shear column are fixedly connected to the lower beam 9 and the upper beam 8, respectively. The shear column includes an active powder concrete outer mold 3 and plain concrete 4 filling the internal space of the active powder concrete outer mold 3.

[0032] RPC-PC bundled shear walls leverage the material advantages of RPC to improve the load-bearing and seismic performance of shear walls, while also enhancing their fire resistance, impact resistance, and corrosion resistance. Furthermore, prefabricating RPC into the outer formwork of the shear wall creates the RPC-PC bundled shear wall external mold. This combination significantly reduces the use of wooden and steel formwork, minimizes environmental impact, and improves construction efficiency. RPC-PC bundled shear walls utilize only a small amount of RPC externally, typically with a thickness controlled between 25 and 50 mm, and rarely exceeding 100 mm in actual projects, resulting in low cost. Considering the life-cycle cost of shear walls, RPC-PC composite shear walls offer economic advantages, effectively reducing post-construction maintenance costs, and possess broad engineering application prospects.

[0033] like Figure 2As shown, the reactive powder concrete outer mold 3 includes an outer frame and multiple partitions 10. Figure 2 The diagram shows two partitions 10 (which can be added or removed depending on the actual project), each of which is disposed in the internal space of the outer frame, dividing the internal space of the outer frame into multiple cavities. Figure 2 It has three cavities (within which there are three cavities), each filled with the plain concrete 4. Figure 2 In this design, all partitions 10 are parallel to each other and have the same thickness. The outer frame and partitions 10 are integrally formed and are both made of RPC material. The outer frame can be, for example, Figure 2 In other embodiments, the outer frame can also be a square column shape, or an arc-shaped column shape, etc.

[0034] like Figure 3 The diagram shows a portion of the end face of the partition 10. Each partition 10 has holes 11, which can be spaced 200-400 mm apart, and the spacing of the holes 11 can be determined according to the specific situation. The holes 11 connect two adjacent cavities. After the plain concrete 4 is penetrated into the holes 11, it can enhance the connection between the plain concrete 4 and the reactive powder concrete outer mold 3 (RPC outer mold), and prevent the RPC outer mold from peeling off from the internal concrete.

[0035] like Figure 1 The shear column is perpendicular to the lower beam 9 and the upper beam 8. With the axis of the shear column as the longitudinal direction and the axes of the lower beam 9 and the upper beam 8 as the transverse direction, the shear column also includes multiple longitudinal reinforcing bars 1 and multiple stirrups 2. For example... Figures 1-2 The longitudinal steel bars 1 are embedded in the outer frame of the reactive powder concrete outer mold 3 and the body of the partition plate 10. Each of the stirrups 2 is arranged laterally, and multiple stirrups 2 tighten the multiple longitudinal steel bars 1 in the cavity wall of each cavity from the top to the bottom.

[0036] The reinforced RPC is prefabricated into the outer formwork of the shear wall, forming the outer formwork of the RPC-PC bundle shear wall. This combination can save a lot of formwork engineering, and at the same time, the RPC bundles can act as steel, improving the load-bearing capacity and seismic performance of the composite shear wall.

[0037] like Figure 1 As shown, both ends of each of the longitudinal steel bars 1 extend into the lower beam 9 and the upper beam 8, respectively, forming the upper extension section steel bar 12 and the lower extension section steel bar 5.

[0038] like Figure 1As shown, the lower beam 9 is provided with multiple grouting corrugated pipes 7. The lower end of a longitudinal steel bar 1, i.e. the lower extension section steel bar 5, is inserted into each grouting corrugated pipe 7 and fixedly connected by the concrete filled in the grouting corrugated pipe 7. The concrete filled in the grouting corrugated pipe 7 can be ultra-high performance concrete mortar 6.

[0039] The upper end of the longitudinal steel bar 1, namely the upper extension steel bar 12, is tied to the steel bar in the upper beam 8 and fixed to each other by plain concrete 4 poured into the upper beam 8.

[0040] The fabrication method of this semi-assembled RPC-PC bundle shear wall includes the following steps:

[0041] First, the lower beam 9 is prefabricated, and the grouting corrugated pipe 7 is pre-embedded in the lower beam 9.

[0042] 2. Process the active powder concrete outer mold 3. During construction, both ends of the longitudinal steel bar 1 extend out of the active powder concrete outer mold 3. At the same time, holes 11 are opened on the partition 10 inside the active powder concrete outer mold 3. Finally, plain concrete 4 is poured into the internal space of the active powder concrete outer mold 3 and cured.

[0043] 3. After the curing time is over, pour concrete mortar into the pre-embedded grouting corrugated pipe 7, then insert the lower end of the longitudinal steel bar 1 into the grouting corrugated pipe 7, and after curing, complete the assembly of the lower beam 9 and the reactive powder concrete outer formwork 3.

[0044] 4. Tie the upper end of the longitudinal steel bar 1 to the steel bar in the upper beam 8. After completion, pour plain concrete 4 into the upper beam 8. After curing, the preparation of the RPC-PC shear wall is completed.

[0045] This method employs semi-prefabricated construction technology, which can save a significant amount of wooden and steel formwork, minimize the impact on the surrounding environment, improve work efficiency, and especially reduce subsequent maintenance costs. RPC-PC bundled shear walls not only quickly, simply, and efficiently meet building requirements, but also align with the national policy of "low-carbon, green, and environmentally friendly" construction, possessing broad prospects for engineering applications.

[0046] Step one specifically involves prefabricating the lower beam 9 in the prefabrication yard, including positioning the grouting corrugated pipe 7 in advance during the reinforcement binding process for assembly with the upper shear column. The strength grade of the concrete poured into the lower beam 9 can be the same as that of plain concrete 4, or plain concrete 4 can be used directly. The RPC-PC composite shear wall structure uses grouting corrugated pipe 7 for connection, which allows for rapid construction, saves construction time, has minimal impact on the surrounding environment, and ensures controllable quality and high safety performance.

[0047] In step two, processing the reactive powder concrete outer mold 3 includes: in the prefabrication yard, binding multiple longitudinal steel bars 1 and multiple stirrups 2 into a steel cage and placing it into the outer mold, with both ends of the longitudinal steel bars 1 extending out of the outer mold, and reserving a hole 11 every 300mm in the middle partition; finally, pouring reactive powder concrete and curing to obtain the reactive powder concrete outer mold 3. In a preferred embodiment, before pouring the inner concrete (plain concrete 4), the inner surface and upper and lower end surfaces of the RPC outer mold (reactive powder concrete outer mold 3) should be appropriately roughened to increase surface roughness and improve the adhesion between the inner concrete and the RPC outer mold.

[0048] In a preferred embodiment, before assembling the lower beam and the upper shear column (RPC bundle) in step three, the upper surface of the lower beam 9 is roughened appropriately, and then the ultra-high performance concrete mortar 6 is poured into the grouting corrugated pipe 7. Then, the reinforcing bars extending from the lower end of the shear column are inserted. During construction, care should be taken to prevent the RPC outer formwork from tipping over, and a support bracket can be used for support.

[0049] The RPC-PC bundled shear wall proposed in this implementation plan can not only meet building requirements quickly, simply, and efficiently, but also conforms to the national concept of "low-carbon, green, and environmentally friendly" and has broad prospects for engineering applications.

[0050] The above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of protection of the present invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A semi-prefabricated RPC-PC bundled shear wall, characterized in that: It includes a lower beam (9), a shear column, and an upper beam (8); the two ends of the shear column are respectively fixedly connected to the lower beam (9) and the upper beam (8); the shear column includes an active powder concrete outer mold (3) and plain concrete (4) filled in the internal space of the active powder concrete outer mold (3); the active powder concrete outer mold (3) includes an outer frame and multiple partitions (10), each of the partitions (10) is disposed in the internal space of the outer frame, dividing the internal space of the outer frame into multiple The cavity is filled with plain concrete (4); the shear column also includes multiple longitudinal steel bars (1) and multiple stirrups (2), the upper end of the longitudinal steel bars (1) is tied to the steel bars in the upper beam (8) and fixed to each other by plain concrete (4) poured into the upper beam (8), and the lower end of the longitudinal steel bars (1) extends into the lower beam (9); each partition (10) is provided with holes (11); the partition is integrally formed with the outer mold by active powder concrete.

2. The semi-prefabricated RPC-PC bundled shear wall according to claim 1, characterized in that: The shear column is perpendicular to the lower beam (9) and the upper beam (8); the axis of the shear column is longitudinal, and the axes of the lower beam (9) and the upper beam (8) are transverse; the longitudinal steel bars (1) are embedded in the outer frame and the body of the partition plate (10) of the active powder concrete outer mold (3); each stirrup (2) is arranged transversely, and multiple stirrups (2) tighten multiple longitudinal steel bars (1) in the cavity wall of each cavity from the upper end to the lower end.

3. The semi-prefabricated RPC-PC bundled shear wall according to claim 2, characterized in that: The lower beam (9) is provided with multiple grouting corrugated pipes (7), and the lower end of a longitudinal steel bar (1) is inserted into each grouting corrugated pipe (7), and the connection is fixed by the concrete filled in the grouting corrugated pipe (7).

4. A method for preparing a semi-assembled RPC-PC bundled shear wall, applied to the preparation of the semi-assembled RPC-PC bundled shear wall as described in claim 3, characterized in that, Includes the following steps: First, the lower end beam (9) is prefabricated, and the grouting corrugated pipe (7) is pre-embedded in the lower end beam (9).

2. Process the active powder concrete outer mold (3). During construction, both ends of the longitudinal steel bar (1) extend out of the active powder concrete outer mold (3). At the same time, holes (11) are opened on the partition (10) inside the active powder concrete outer mold (3). Finally, plain concrete (4) is poured into the internal space of the active powder concrete outer mold (3) and cured.

3. After the curing time is over, concrete mortar is poured into the pre-embedded grouting corrugated pipe (7), and then the lower end of the longitudinal steel bar (1) is inserted into the grouting corrugated pipe (7). After curing, the lower beam (9) and the active powder concrete outer formwork (3) are assembled.

4. Tie the upper end of the longitudinal steel bar (1) to the steel bar in the upper beam (8), and pour plain concrete (4) into the upper beam (8) after completion. After curing, the preparation of the RPC-PC shear wall is completed.

5. The method for preparing a semi-assembled RPC-PC bundled shear wall according to claim 4, characterized in that, Step one specifically involves prefabricating the lower beam (9) in the prefabrication yard, including positioning the grouting corrugated pipe (7) in advance when tying the reinforcing bars, for assembly with the upper shear column.

6. The method for preparing a semi-assembled RPC-PC bundled shear wall according to claim 4, characterized in that, In step two, the processing of the active powder concrete outer mold (3) includes: in the prefabrication yard, multiple longitudinal steel bars (1) and multiple stirrups (2) are tied into a steel cage and placed in the outer mold, with the two ends of the longitudinal steel bars (1) extending out of the outer mold, and a hole (11) is reserved in the middle partition every 300mm. Finally, active powder concrete is poured, and after curing, the active powder concrete outer mold (3) is obtained.

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