A prefabricated shear wall based on helical stirrup restraint and its construction method

Abstract

This invention discloses a prefabricated shear wall based on helical stirrup constraint and its construction method, including prefabricated wall panels and post-cast concrete at joints; the prefabricated wall panels include confining edge helical stirrups and wall panel concrete; the confining edge helical stirrups are symmetrically arranged at both ends of the confining edges of the wall panel concrete; wherein, one side of the confining edge helical stirrup is embedded at the confining edge of the wall panel concrete, and the other side is exposed on the outside of the wall panel concrete, extending to the vertical joint between two adjacent prefabricated wall panels; the post-cast concrete at the joint is arranged at the vertical joint between two adjacent prefabricated wall panels and wraps around the exposed end of the confining edge helical stirrup; this invention greatly reduces the difficulty of on-site construction, reduces construction procedures, significantly reduces the requirements for construction accuracy, and relatively reduces the use of construction materials and manpower, saving costs, while still ensuring the strength, reliability, and integrity of the wall.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated building technology, and specifically relates to a prefabricated shear wall based on spiral stirrup constraint and its construction method. Background Technology

[0002] The construction industry is gradually transitioning from "extensive development" to "refined development." Traditional cast-in-place construction methods are greatly affected by site conditions, consume a lot of manpower and resources, and have long construction periods and high noise levels. Therefore, prefabricated construction methods are increasingly becoming the mainstream of the construction industry. Among them, prefabricated shear wall structures, as an important structural system, form an industrial chain that is superior to traditional cast-in-place concrete structures through standardized design, factory production, and prefabricated construction. The key and difficult problem of prefabricated shear wall structures has always been the reliability of joint connections. Improving its economy, practicality, and construction efficiency is the core issue of joint connections.

[0003] Currently, the main joint connection methods for prefabricated shear walls include grouting sleeves, bolt connections, and grout-anchored lap joints. While grouting sleeve connections offer advantages such as good structural integrity, high strength, and high reliability, they require pre-drilled grouting holes and sleeves, complicating the construction process. Furthermore, the grout density of the sleeves is significantly affected by factors such as worker skill and the fluidity of the grout material. Bolt connections, while greatly reducing on-site pouring, require high precision, presenting challenges due to complex construction procedures and the potential for bolt loosening under repeated loads, resulting in poor wall integrity after connection. Wall integrity directly impacts the shear wall's load-bearing capacity and seismic performance. Grout-anchored lap joints suffer from drawbacks such as a large number of openings, high installation difficulty, and susceptibility to cracking at the openings. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this invention provides a prefabricated shear wall based on spiral stirrup constraint and its construction method, so as to solve the technical problems of complex construction procedures, high construction accuracy requirements and high construction difficulty of existing prefabricated shear walls.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This invention provides a prefabricated shear wall based on helical stirrup constraint, comprising a prefabricated wall panel and post-cast concrete at the joints; the prefabricated wall panel includes helical stirrups constraining the edges and wall panel concrete;

[0007] The confining edge spiral stirrups are symmetrically arranged at both ends of the confining edge of the wall panel concrete; wherein, one side of the confining edge spiral stirrup is embedded at the confining edge of the wall panel concrete; the other side of the confining edge spiral stirrup is exposed on the outside of the wall panel concrete and extends into the vertical joint between two adjacent precast wall panels; the post-cast concrete of the joint is arranged at the vertical joint between two adjacent precast wall panels and wraps around the exposed end of the confining edge spiral stirrup.

[0008] Furthermore, the precast wall panel also includes longitudinal reinforcing bars at the confining edges; the longitudinal reinforcing bars at the confining edges of the wall panel concrete are evenly arranged and vertically inserted into the embedded ends of the spiral stirrups at the confining edges.

[0009] Furthermore, the precast wall panel also includes a wall reinforcement cage, which is located in the middle of the wall panel concrete; wherein the wall reinforcement cage is woven from wall horizontal bars, wall horizontal tie bars and wall longitudinal bars.

[0010] Furthermore, it also includes longitudinal reinforcement bars for the joints, which are evenly arranged in the post-cast concrete of the joints and vertically inserted into the exposed ends of the spiral stirrups at the constraint edges.

[0011] Furthermore, the joint longitudinal reinforcement is located at the bend angle of the constraint edge spiral stirrup.

[0012] Furthermore, the constrained edge spiral stirrup includes several spiral stirrup single-layer structures, which are connected sequentially from top to bottom in a spiral shape; each spiral stirrup single-layer structure includes a first connecting section, a first U-shaped stirrup frame, a second U-shaped stirrup frame, and a second connecting section.

[0013] The first end of the first connecting segment is connected to the tail end of the next layer of spiral stirrup single-layer structure, the tail end of the first connecting segment is connected to the first end of the first U-shaped stirrup frame, the tail end of the first U-shaped stirrup frame is connected to the first end of the second U-shaped stirrup frame, the tail end of the second U-shaped stirrup frame is connected to the first end of the second connecting segment, and the tail end of the second connecting segment is connected to the first end of the previous layer of spiral stirrup single-layer structure.

[0014] Furthermore, in the horizontal direction, the single-layer spiral stirrup structure in adjacent precast wall panels overlaps each other; in the vertical direction, the single-layer spiral stirrup structure in adjacent precast wall panels is staggered vertically.

[0015] Furthermore, at the constraint edges at both ends of the same precast wall panel, the single-layer spiral stirrup structure is staggered vertically.

[0016] Furthermore, the constrained edge spiral stirrup is made by continuously bending a single steel bar.

[0017] This invention also provides a construction method for prefabricated shear walls based on helical stirrup constraints, comprising the following steps:

[0018] Symmetrical spiral stirrups are set at the constraint edges of the wall panels, and wall panel concrete is poured to prepare precast wall panels; adjacent precast wall panels are hoisted and overlapped, and then joint post-poured concrete is poured at the vertical joint between the two adjacent precast wall panels.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] This invention provides a prefabricated shear wall based on helical stirrup constraint and its construction method. By setting helical stirrups at the constraint edge of the wall panel concrete, with one side of the helical stirrups exposed on the outside of the wall panel concrete, and when assembling two adjacent prefabricated wall panels, the exposed ends of the helical stirrups are overlapped to form a joint reinforcement mesh. Post-concrete pouring is then performed at the vertical joint to connect the two adjacent prefabricated wall panels. The structure is simple, greatly reducing the difficulty of on-site construction, reducing construction steps, lowering the requirements for construction precision, and relatively reducing the use of construction materials and manpower, thus saving costs while still ensuring the strength, reliability, and integrity of the wall.

[0021] Furthermore, by setting longitudinal reinforcement bars at the confined edge of the wall panel concrete, the anchorage strength of the spiral stirrups at the confined edge is effectively ensured, thereby guaranteeing the strength and reliability of the wall.

[0022] Furthermore, by setting joint longitudinal reinforcement at the exposed ends of the spiral stirrups at the constraint edges, the stress of the structure can be effectively transferred, ensuring the full utilization of the structure's tensile and compressive strength.

[0023] Furthermore, the confined edge spiral stirrups are composed of several single-layer spiral stirrups connected end to end in a spiral shape, eliminating the need for additional tie bars between the stirrups. This simplifies the manufacturing process and effectively improves the reliability and strength of the structure. Attached Figure Description

[0024] Figure 1 This is a front view of the prefabricated shear wall based on helical stirrup constraint as described in this invention;

[0025] Figure 2 This is a cross-sectional view of the prefabricated shear wall based on spiral stirrup constraint according to the present invention.

[0026] Figure 3 This is a front view of the prefabricated wall panel in this invention;

[0027] Figure 4This is a cross-sectional view of the prefabricated wall panel in this invention;

[0028] Figure 5 This is a schematic diagram of the single-layer structure of the spiral stirrup in this invention.

[0029] Among them, 10 is the confined edge spiral stirrup, 11 is the confined edge longitudinal reinforcement, 12 is the wall body horizontal reinforcement, 13 is the wall body longitudinal reinforcement, 14 is the wall panel concrete, and 15 is the joint longitudinal reinforcement; 100 is the first connecting section, 200 is the first U-shaped stirrup frame, 300 is the second U-shaped stirrup frame, and 400 is the second connecting section. Detailed Implementation

[0030] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0031] As attached Figure 1-4 As shown, the present invention provides a prefabricated shear wall based on spiral stirrup constraint, including prefabricated wall panels, post-cast concrete at joints and longitudinal reinforcement 15 at joints; the post-cast concrete at joints is set at the vertical joint between two adjacent prefabricated wall panels, and the longitudinal reinforcement 15 at joints is uniformly arranged in the post-cast concrete at joints.

[0032] In this invention, the precast wall panel includes confining edge spiral stirrups 10, confining edge longitudinal bars 11, wall body reinforcement cage, and wall panel concrete; the confining edge spiral stirrups 10 are symmetrically arranged at both ends of the confining edge of the wall panel concrete 14, and the confining edge spiral stirrups 10 are made by continuously bending a single steel bar; wherein, one side of the confining edge spiral stirrups 10 is embedded at the confining edge of the wall panel concrete 14; the other side of the confining edge spiral stirrups 10 is exposed on the outside of the wall panel concrete 14 and extends into the vertical joint between two adjacent precast wall panels.

[0033] The longitudinal reinforcing bars 11 are uniformly arranged at the confined edges of the wall panel concrete 14 and vertically inserted into the embedded ends of the confined edge spiral stirrups 10. By setting the longitudinal reinforcing bars 11 at the confined edges of the wall panel concrete 14, the combined action of the longitudinal reinforcing bars 11 and the wall panel concrete improves the overall compressive strength of the shear wall and the deformation capacity of the wall edge, thereby improving the brittleness of the wall under compressive failure. Secondly, the diameter of the longitudinal reinforcing bars 11 is designed to be larger than the diameter of the wall body longitudinal reinforcing bars 13, so that the compressive capacity of the wall edge is greater than that of the wall center. This allows the wall center to fail first and release seismic energy during an earthquake, while the confined edge of the wall can continue to exert its load-bearing capacity, preventing the wall from failing instantly during an earthquake and improving the ductility of the wall.

[0034] The wall reinforcement cage is located in the middle of the wall panel concrete 14. The wall reinforcement cage is woven from wall horizontal bars 12, wall horizontal tie bars and wall longitudinal bars 13. By setting the wall reinforcement cage in the middle of the wall panel concrete 14, the wall reinforcement cage can restrain the wall panel concrete, thereby improving the wall's compressive strength, shear strength and bending strength.

[0035] In this invention, the constrained edge spiral stirrup 10 comprises several single-layer spiral stirrup structures, which are connected sequentially end-to-end in a spiral shape; as shown in the attached figure. Figure 5 As shown, the single-layer spiral stirrup structure includes a first connecting section 100, a first U-shaped stirrup frame 200, a second U-shaped stirrup frame 300, and a second connecting section 400. The first end of the first connecting section 100 is connected to the tail end of the next layer of the single-layer spiral stirrup structure, the tail end of the first connecting section 100 is connected to the first end of the first U-shaped stirrup frame 200, the tail end of the first U-shaped stirrup frame 200 is connected to the first end of the second U-shaped stirrup frame 300, the tail end of the second U-shaped stirrup frame 300 is connected to the first end of the second connecting section 400, and the tail end of the second connecting section 400 is the same as the first end of the previous layer of the single-layer spiral stirrup structure.

[0036] Specifically, the single-layer spiral stirrup structure is formed by winding the reinforcing bars in a spiral pattern of node a → node b → node c → node d → node e → node f → node g → node h → node i; wherein, node a is the first end of the first connecting segment 100; node b is the last end of the first connecting segment 100 and serves as the connection node between the first connecting segment 100 and the first U-shaped stirrup frame 200; node e serves as the connection node between the first U-shaped stirrup frame 200 and the second U-shaped stirrup frame, that is, the last end of the first U-shaped stirrup frame 200 or the first end of the second U-shaped stirrup frame 300; node h is the connection node between the second U-shaped stirrup frame 300 and the second connecting segment 400, that is, the last end of the second U-shaped stirrup frame 300 or the first end of the second connecting segment 400; and node i is the last end of the second connecting segment 400.

[0037] It should be noted that node e is located in the middle of the first connecting segment 100, node b is located between node e and node f, node c is located between node g and node d, and node d is located between node c and node h; the line connecting node g and node h and the second connecting segment are set at a bend angle; preferably, the bend angle is an obtuse angle.

[0038] In this invention, spiral stirrups 10 are symmetrically set at the two ends of the wall panel concrete 14. The spiral stirrups 10 adopt a single-layer structure of several spiral stirrups connected end to end in a spiral shape. Compared with ordinary stirrups, they have a better restraining effect on the wall concrete, making the wall stronger. Moreover, the spiral stirrups are a continuous whole of steel reinforcement components. The steel reinforcement skeleton formed by the spiral stirrups is tightly connected, and its stability and firmness are outstanding.

[0039] It should be noted that, in the horizontal direction, the single-layer spiral stirrups in adjacent precast wall panels are interlocked; in the vertical direction, the single-layer spiral stirrups in adjacent precast wall panels are staggered vertically. This staggered arrangement allows for unobstructed splicing of the two precast wall panels, doubles the stirrup density at the joint, and increases the joint strength, compensating for the incomplete casting of the two precast wall panels. The joint tightness is significantly improved, enhancing the overall integrity of the spliced ​​structure. Furthermore, at the constrained edges of the same precast wall panel, the staggered arrangement of the single-layer spiral stirrups ensures that when any two precast wall panels are assembled, the single-layer spiral stirrups at the vertical joint between adjacent precast wall panels can overlap, improving the structural strength and reliability of the vertical joint, ensuring the versatility of the precast wall panels, facilitating on-site assembly, and greatly reducing construction difficulty.

[0040] In this invention, the longitudinal joint reinforcement 15 is vertically inserted into the exposed end of the confining edge spiral stirrup 10; wherein, the longitudinal joint reinforcement 15 is located at the bending angle of the confining edge spiral stirrup 10; by setting the longitudinal joint reinforcement 15 at the joint, the joint has better compressive strength and can tightly lock the staggered stirrups of the two precast wall panels together, further improving the strength of the joint, further enhancing the integrity of the two precast wall panels after splicing, and preventing cracking at the joint.

[0041] Construction process:

[0042] The prefabricated shear wall based on spiral stirrup constraint of the present invention is constructed by first setting spiral stirrups 10 symmetrically at the constraint edge of the wall panel, then pouring wall panel concrete 14 to prepare prefabricated wall panels; then hoisting and overlapping two adjacent prefabricated wall panels, and then constructing joint post-poured concrete at the vertical joint between the two adjacent prefabricated wall panels.

[0043] Specifically, the construction method for the prefabricated shear wall based on helical stirrup restraint includes the following steps:

[0044] Step 1: Use a single steel bar to form a confined edge spiral stirrup 10 by winding it along a preset path; specifically, wind it in a spiral pattern of node a→node b→node c→node d→node e→node f→node g→node h→node i to form a single-layer spiral stirrup structure, and then repeat this process to form the entire confined edge spiral stirrup 10; wherein, during the spiral winding process, the confined edge spiral stirrup 10 forms cb segment and de segment structure, and the cb segment and de segment structure serve as a tie structure similar to the spiral; therefore, there is no need to set up separate tie bars between the stirrups.

[0045] Step 2: Vertically insert the constraint edge longitudinal reinforcement 11 into the embedded end of the constraint spiral stirrup 10 to form a steel cage in the constraint edge area of ​​the precast wall panel.

[0046] Step 3: Fabricate horizontal reinforcing bars 12, horizontal tie bars, and longitudinal reinforcing bars 13 for the wall body. Use the horizontal reinforcing bars 12, horizontal tie bars, and longitudinal reinforcing bars 13 to weave together the wall reinforcement cage.

[0047] Step 4: After erecting the formwork, pour the wall panel concrete 14, cure it, and then remove the formwork to obtain the precast wall panel. In the length direction of the wall, the length of the wall panel concrete 14 is less than the extension length of the confining edge spiral stirrups in the length direction of the wall, so that a portion of the spiral stirrups are exposed on the outer sides of both ends of the precast wall panel. Furthermore, the spiral stirrups exposed at both ends of the precast wall panel are arranged in a staggered single-layer structure, so that when two precast wall panels are assembled, the exposed spiral stirrups at both ends of the precast wall panel can be staggered. In the thickness direction of the wall, the thickness of the wall panel concrete 14 is greater than the width of the confining edge spiral stirrups, to form a concrete protective layer.

[0048] Step 5: The precast wall panels are prefabricated in the factory and transported to the construction site for on-site assembly, following the operations described in steps 1-4 above. Specifically, the precast wall panels are hoisted to the designed position, and then the joint longitudinal reinforcement 15 is vertically inserted into the exposed end of the constraint edge spiral stirrup 10 to form a steel cage for the joint area. The joint longitudinal reinforcement 15 is located at the bending angle of the constraint edge spiral stirrup 10.

[0049] Step 6: Pour post-joint concrete in the joint area to connect the two adjacent precast wall panels together.

[0050] In this invention, the confining edge spiral stirrups are made from a single piece of steel bar spirally. During the spiraling process, the stirrups can form a structure similar to tie bars, eliminating the need for separate tie bars between single-layer structures and improving the structural integrity and strength. When the wall is cast with concrete, a portion of the confining edge spiral stirrups is exposed on the outer side of the precast wall panel at both ends of the confining edge. The exposed stirrups at both ends of the precast wall panel are on different horizontal planes, allowing the exposed stirrups to stagger when two precast wall panels overlap. On the construction site, the exposed stirrups of one shear wall are overlapped with the exposed steel bars of an adjacent shear wall on the same floor, longitudinal reinforcement is inserted, and then concrete is poured to connect the two walls. This significantly reduces the difficulty of on-site construction, reduces construction steps, lowers the requirements for construction precision, and reduces the use of construction materials and manpower, saving costs while still ensuring the strength and reliability of the wall and maintaining good integrity. It effectively solves the problems of high construction difficulty, high precision requirements, and high manpower and material resource demands of existing prefabricated shear walls.

[0051] The prefabricated shear wall based on helical stirrup constraint and its construction method described in this invention have the advantages of low on-site construction difficulty, fewer procedures, and lower requirements for operators; the structure has good integrity, resulting in excellent load-bearing capacity and seismic performance; the structure has high reliability and strength, and the use of helical stirrups further improves the reliability and strength; the structure has fewer components, is simple in structure, and is easy to manufacture; the effective bonding between the post-cast concrete at the joints, the longitudinal reinforcement at the joints, and the exposed helical stirrups allows for effective stress transfer, and the tensile and compressive strength of the structure can be fully utilized.

[0052] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A prefabricated shear wall based on helical stirrup restraint, characterized in that, It includes precast wall panels and post-cast concrete at joints; the precast wall panels include edge-constraining spiral stirrups (10) and wall panel concrete (14). The confining edge spiral stirrups (10) are symmetrically arranged at both ends of the wall panel concrete (14) at the confining edge; wherein, one side of the confining edge spiral stirrups (10) is embedded at the confining edge of the wall panel concrete (14); the other side of the confining edge spiral stirrups (10) is exposed on the outside of the wall panel concrete (14) and extends to the vertical joint between two adjacent precast wall panels; the joint post-cast concrete is set at the vertical joint between two adjacent precast wall panels and wraps around the exposed end of the confining edge spiral stirrups (10); The constrained edge spiral stirrup (10) includes several spiral stirrup single-layer structures, which are connected in a spiral shape from top to bottom; the spiral stirrup single-layer structure includes a first connecting section (100), a first U-shaped stirrup frame (200), a second U-shaped stirrup frame (300) and a second connecting section (400). The first end of the first connecting segment (100) is connected to the tail end of the next layer of spiral stirrup single-layer structure, the tail end of the first connecting segment (100) is connected to the first end of the first U-shaped stirrup frame (200), the tail end of the first U-shaped stirrup frame (200) is connected to the first end of the second U-shaped stirrup frame (300), the tail end of the second U-shaped stirrup frame (300) is connected to the first end of the second connecting segment (400), and the tail end of the second connecting segment (400) is connected to the first end of the previous layer of spiral stirrup single-layer structure. Specifically, a single steel bar is wound along a preset path to form a confined edge spiral stirrup (10); wherein, a single-layer spiral stirrup structure is formed by winding in a spiral manner of node a→node b→node c→node d→node e→node f→node g→node h→node i, and then the spiral is wound in the same manner to form the entire confined edge spiral stirrup (10); during the spiral winding process, the confined edge spiral stirrup (10) forms a node c-node b segment and a node d-node e segment structure, and the node c-node b segment and the node d-node e segment structure are used as the tie structure between the spirals; Node a → Node b forms the first connecting segment (100), Node b → Node c → Node d → Node e forms the first U-shaped stirrup frame (200), Node e → Node f → Node g → Node h forms the second U-shaped stirrup frame (300), Node h → Node i forms the second connecting segment (400).

2. A prefabricated shear wall based on helical stirrup constraint according to claim 1, characterized in that, The precast wall panel also includes longitudinal reinforcing bars (11) at the edge of the wall panel concrete (14). The longitudinal reinforcing bars (11) at the edge of the wall panel concrete (14) are evenly arranged and vertically inserted into the embedded end of the spiral stirrups (10) at the edge of the wall panel.

3. A prefabricated shear wall based on helical stirrup constraint according to claim 1, characterized in that, The precast wall panel also includes a wall reinforcement cage, which is located in the middle of the wall panel concrete (14); wherein the wall reinforcement cage is woven from wall horizontal bars (12), wall horizontal tie bars and wall longitudinal bars (13).

4. A prefabricated shear wall based on helical stirrup constraint according to claim 1, characterized in that, It also includes joint longitudinal reinforcement (15), which is evenly arranged in the post-cast concrete of the joint and vertically inserted into the exposed end of the confining edge spiral stirrup (10).

5. A prefabricated shear wall based on helical stirrup constraint according to claim 4, characterized in that, The joint longitudinal reinforcement (15) is located at the bend angle of the constraint edge spiral stirrup (10).

6. A prefabricated shear wall based on helical stirrup constraint according to claim 1, characterized in that, In the horizontal direction, the single-layer spiral stirrup structure in adjacent precast wall panels overlaps each other; in the vertical direction, the single-layer spiral stirrup structure in adjacent precast wall panels is staggered vertically.

7. A prefabricated shear wall based on helical stirrup constraint according to claim 1, characterized in that, At the two ends of the constrained edge of the same precast wall panel, the single-layer spiral stirrup structure is staggered vertically.

8. A prefabricated shear wall based on helical stirrup constraint according to claim 1, characterized in that, The confined edge spiral stirrup (10) is made by continuously bending a single steel bar.

9. A construction method for a prefabricated shear wall based on helical stirrup restraint as described in any one of claims 1-8, characterized in that, Includes the following steps: At the constraint edge of the wall panel, symmetrical spiral stirrups (10) are set, and wall panel concrete (14) is poured to prepare a precast wall panel; two adjacent precast wall panels are hoisted and overlapped, and then joint post-poured concrete is poured at the vertical joint between the two adjacent precast wall panels.

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