A precast concrete composite structure for elevator shafts and its construction method

Abstract

A precast concrete composite structure and construction method for elevator shafts, belonging to the field of prefabricated building technology, is disclosed. It includes multiple sets of composite shear walls, each set continuously arranged vertically, with horizontal construction joints between adjacent sets. Each set of composite shear walls includes a first precast concrete layer, a second precast concrete layer, and a connecting structure. The second precast concrete layer is placed inside the first precast concrete layer and has a cavity. Both the first and second precast concrete layers are annular structures formed by assembling multiple precast concrete slabs, with vertical splicing gaps. This invention solves the problems in existing composite elevator shaft structures, such as complex molds due to protruding reinforcing bars at the ends of precast components, easy deformation during transportation and hoisting, the need for separate formwork for edge components, numerous procedures, difficulty in connecting longitudinal reinforcement in confined spaces, and inconvenience in transportation and hoisting. It reduces production and construction difficulty and improves efficiency.

Description

Technical Field

[0001] This invention relates to a precast concrete composite structure and construction method for elevator shafts, belonging to the field of prefabricated building technology. Background Technology

[0002] In the process of building industrialization, precast concrete structures have been widely used due to their advantages such as controllable quality, fast construction speed, and less on-site wet work. As a core vertical transportation component in high-rise buildings, the construction of elevator shafts using precast concrete components has become an industry trend.

[0003] Existing prefabricated elevator shafts are typically constructed by assembling whole prefabricated wall panels or by casting the entire shaft on-site with formwork. The assembled method has problems such as numerous joints, poor integrity, and insufficient waterproofing; while the cast-in-place method has drawbacks such as large formwork usage, long construction period, and high on-site labor requirements.

[0004] To balance prefabrication and integrity, some existing solutions have adopted composite shear wall structures, which consist of two layers of prefabricated concrete and a connecting structure between them. A cavity is set between the inner and outer layers, and concrete is poured on site to form an integral load-bearing component. Typically, multiple composite shear walls are spliced ​​together on site to form a cylindrical structure.

[0005] However, existing composite elevator shaft structures still have the following shortcomings in design and construction:

[0006] Firstly, in the construction of edge components at wall corners or T-shaped joints, existing composite shear walls typically use a method where reinforcing bars extend from the ends of the precast concrete layer. The extended horizontal reinforcing bars need to be lapped or welded on-site before formwork is erected and concrete is poured. This practice results in a large amount of reinforcing bars protruding from the ends of the precast components, making the production molds complex, and the extended reinforcing bars are prone to collision and deformation during transportation and hoisting.

[0007] Secondly, the edge component areas require separate formwork, which involves more construction procedures, lower efficiency, and increases the amount of on-site formwork work and labor costs.

[0008] Third, when connecting the longitudinal reinforcement of the upper and lower edge components, the internal space of the shaft is narrow and the reinforcement is densely intersected, making the connection operation difficult and the construction quality hard to guarantee.

[0009] Fourth, when the cavity between the inner and outer precast layers is designed to be narrow (80mm to 150mm), construction personnel have difficulty entering or are unable to enter the cavity to operate, making it difficult to implement the connection process between the inner and outer precast layers.

[0010] In addition, existing structures mostly use integral prefabricated ring layers or whole prefabricated wall panels. The individual components are large in size and heavy in weight, which makes demolding, transportation and on-site hoisting very difficult. This is especially true for projects with ultra-large cross-sectional dimensions or transportation restrictions, which make construction organization more difficult.

[0011] Therefore, there is an urgent need to propose a new type of precast concrete composite structure and construction method for elevator shafts to solve the above-mentioned technical problems. Summary of the Invention

[0012] The purpose of this invention is to solve the problems in existing composite elevator shaft structures, such as complex molds due to protruding reinforcing bars at the ends of precast components, easy deformation during transportation and hoisting, the need for separate formwork for edge components, numerous procedures, difficulties in connecting longitudinal reinforcement between upper and lower layers in confined spaces, and the large size of integral precast components, which are inconvenient for transportation and hoisting. It also addresses the problem of personnel being unable to operate in narrow cavities between inner and outer precast layers. The invention provides a precast concrete composite structure with no protruding reinforcing bars at the ends, no need for formwork, convenient assembly, and suitable dimensions for transportation of individual components. A brief overview of the invention is provided below to provide a basic understanding of certain aspects of the invention. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention.

[0013] The technical solution of this invention:

[0014] Option 1: A precast concrete composite structure for elevator shafts, comprising multiple sets of composite shear walls, each set of composite shear walls being continuously arranged vertically, and having a horizontal construction joint between adjacent sets of composite shear walls.

[0015] Each of the composite shear walls includes a first precast concrete layer, a second precast concrete layer, and a connecting structure between the first precast concrete layer and the second precast concrete layer. The second precast concrete layer is placed inside the first precast concrete layer, and there is a cavity between them for cast-in-place concrete.

[0016] Both the first precast concrete layer and the second precast concrete layer are ring structures formed by assembling multiple precast concrete slabs together, and vertical splicing gaps are formed between two adjacent precast concrete slabs.

[0017] The cavity is provided with a reinforcing cage for edge components, which is arranged at the corner of the cavity.

[0018] Preferably, the edge member reinforcement cage includes vertical edge member longitudinal bars and horizontal edge member stirrups, and the edge member longitudinal bars and the edge member stirrups are fixed by binding or welding; the edge member longitudinal bars are formed by multiple vertical bars connected vertically and pass through the horizontal construction joint.

[0019] Preferably, the precast concrete slab has a concrete cross-section without protruding reinforcing bars on the end face facing the vertical splice joint.

[0020] Preferably, the concrete poured in the cavity and at the vertical splicing joints forms a unified whole with the edge member reinforcement cage, the first precast concrete layer, and the second precast concrete layer sharing the load.

[0021] Preferably, the connection structure is a truss reinforcement, with both ends of the truss reinforcement anchored in the first precast concrete layer and the second precast concrete layer, respectively.

[0022] Preferably, the connection structure is a combination of a sliding connector and a tie rod; the sliding connector is disposed on the corresponding surfaces of the first precast concrete layer and the second precast concrete layer, and the sliding connector is a groove-type connector embedded in the precast concrete layer or a rail-type connector installed on the surface of the precast concrete layer; both ends of the tie rod are T-shaped ends, and the two T-shaped ends of the tie rod are respectively connected to the sliding connectors on the first precast concrete layer and the second precast concrete layer.

[0023] Preferably, the vertical splicing joint is filled with sealant, elastic waterproof material, cement grout, or fine aggregate concrete; when the vertical splicing joint is filled with cement grout or fine aggregate concrete, a shear key is provided at the vertical splicing joint.

[0024] Preferably, the combined structure has at least one doorway; the elevator shaft is a single-channel shaft or a double-channel shaft; and the cross-section of the shaft formed by the multiple sets of overlapping shear walls is rectangular, polygonal, or circular.

[0025] Option 2: A construction method for a precast concrete composite structure for elevator shafts, based on the aforementioned precast concrete composite structure, includes the following steps:

[0026] Step 1: Hoist each precast concrete slab of the first set of composite shear walls into place, assemble them to form the first precast concrete layer and the second precast concrete layer, and install the connecting structure to form a cavity between the two, and form a vertical splicing gap between adjacent precast concrete slabs.

[0027] Step 2: Place an edge member reinforcement cage at the corner of the cavity. The edge member reinforcement cage includes vertical edge member longitudinal bars and horizontal edge member stirrups.

[0028] Step 3: Seal the vertical splicing gap, pour concrete into the cavity and the vertical splicing gap, and make the upper end of the longitudinal reinforcement of the edge member extend out of the top surface of the poured concrete.

[0029] Step 4: Hoist each precast concrete slab of the next set of composite shear walls into position, assemble them to form the first and second precast concrete layers, and install the connecting structure. Place the edge member reinforcement cage at the corner of the cavity; fix the lower end of the edge member longitudinal reinforcement cage to the upper end of the edge member longitudinal reinforcement extending from the cavity of the lower layer composite shear wall.

[0030] Step 5: Seal the vertical splicing gaps, pour concrete into the cavity and vertical splicing gaps of the composite shear wall, and make the upper end of the longitudinal reinforcement of the edge member extend out of the top surface of the poured concrete.

[0031] Step Six: Repeat Steps Four and Five until the entire wellbore construction is completed.

[0032] The present invention has the following beneficial effects:

[0033] 1. In this invention, the end face of the precast concrete slab is a concrete cross-section without protruding reinforcing bars. The component production mold is simple, demolding is convenient, and there are no problems of reinforcing bar collision or bending during transportation and hoisting, which greatly reduces the difficulty and cost of production, transportation and hoisting.

[0034] 2. In this invention, the reinforcing cage of the edge component is set independently in the cavity, the precast component has no protruding reinforcing bars, the edge component area does not need to be supported by a separate formwork, and only the splicing gap needs to be simply sealed to pour concrete together with the cavity, which reduces a lot of formwork engineering, has fewer construction procedures and higher efficiency, and effectively shortens the construction cycle.

[0035] 3. In this invention, the longitudinal reinforcement of the edge member is formed by multiple vertical steel bars connected vertically and passing through the horizontal construction joint. The joint of the upper and lower longitudinal reinforcement is located at the bottom of the upper cavity, with sufficient operating space, convenient connection construction and reliable quality, ensuring the continuity of vertical force.

[0036] 4. The sliding connector and the T-shaped ends of the tie rods in this invention can be connected and assembled by only vertical relative movement between the inner and outer prefabricated layers. Construction personnel do not need to enter the narrow cavity to operate, which is safe and has good construction fault tolerance. Multiple tie rods can be assembled into a frame through the connector and pushed into place vertically. The assembly action is simple and efficient.

[0037] 5. In this invention, both the first and second precast concrete layers are assembled from multiple precast concrete slabs to form a ring structure. The individual components are small in size and light in weight, making them easy to demold, transport, and hoist on site. They are especially suitable for the construction of cylindrical structures with ultra-large cross-sectional dimensions or limited transportation, and have strong engineering applicability.

[0038] 6. In this invention, the cast-in-place concrete in the cavity and vertical splicing gaps forms a whole with the edge component steel cage and the inner and outer precast concrete layers bearing the load together. The structure has strong integrity, clear stress distribution, large lateral stiffness, and good waterproof performance. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a precast concrete composite structure for elevator shafts as described in Embodiment 1 of the present invention;

[0040] Figure 2 This is a schematic diagram showing the two ends of the truss reinforcement anchored in the first and second precast concrete layers, respectively.

[0041] Figure 3 for Figure 1 A structural schematic diagram of the steel reinforcement cage for the edge components at the central corner.

[0042] Figure 4 A schematic diagram of the longitudinal section of the wall body showing the connection structure of the longitudinal reinforcement of the upper and lower edge members;

[0043] Figure 5 This is a schematic diagram of a precast concrete composite structure for elevator shafts as described in Embodiment 4 of the present invention;

[0044] Figure 6 This is an isometric schematic diagram of the single-channel wellbore combination structure of the present invention;

[0045] Figure 7 This is an isometric schematic diagram of the dual-channel shaft combination structure of the present invention;

[0046] Figure 8 This is a structural schematic diagram of the truss reinforcement.

[0047] Figure 9 Axonometric schematic diagram of the connection structure between the slide rail connector and the tie rod;

[0048] Figure 10 This is a schematic diagram of the connection structure between the slide rail connector and the T-shaped end of the tie rod.

[0049] Figure 11 This is a schematic diagram of the structure in which the first and second precast concrete layers are connected to the tie rod via a sliding connector.

[0050] In the diagram: 1-Composite shear wall; 11-First precast concrete layer; 12-Second precast concrete layer; 13-Truss reinforcement; 14-Cavity; 15-End face of precast concrete slab; 2-Vertical splice joint; 3-Edge member reinforcement cage; 31-Edge member longitudinal reinforcement; 32-Edge member stirrup; 4-Cast-in-place concrete; 5-Horizontal construction joint; 6-Slide-type connector; 7-Tie rod; 51-T-shaped end; 8-Fine aggregate concrete / filling material; 9-Door opening. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0052] Example 1

[0053] like Figure 1 As shown, this embodiment provides a precast concrete composite structure for elevator shafts, including multiple sets of composite shear walls 1, each set of composite shear walls 1 is continuously arranged in the vertical direction, and there is a horizontal construction joint 5 between adjacent sets of composite shear walls 1.

[0054] Each composite shear wall 1 includes a first precast concrete layer 11, a second precast concrete layer 12, and a connecting structure between the first precast concrete layer 11 and the second precast concrete layer 12. The second precast concrete layer 12 is placed inside the first precast concrete layer 11, forming a cavity 14 between them for cast-in-place concrete. Both the first precast concrete layer 11 and the second precast concrete layer 12 are annular structures formed by assembling multiple precast concrete slabs, with vertical splicing gaps 2 formed between adjacent precast concrete slabs. In this embodiment, the shaft cross-section is rectangular, and each composite shear wall is formed by assembling four precast concrete slabs to form a rectangular annular structure, corresponding to the four walls of the rectangular shaft. Vertical and horizontal reinforcing bars or structural reinforcing bars are arranged inside the precast concrete slabs.

[0055] A reinforcing cage 3 for edge components is installed inside the cavity 14, and the reinforcing cage 3 for edge components is arranged at the corner of the cavity 14. For example... Figure 1 As shown, in the cavity 14 area corresponding to the vertical splicing gap 2 at the four corners of the building, a set of edge component steel cages 3 are independently set.

[0056] like Figure 3As shown, the edge member reinforcement cage 3 includes vertical edge member longitudinal bars 31 and horizontal edge member stirrups 32. The edge member longitudinal bars 31 and edge member stirrups 32 are fixed together by binding. The edge member longitudinal bars 31 are formed by multiple vertical bars connected vertically by sleeves or welding, and penetrate through the horizontal construction joint 5 to form a longitudinal steel bar bundle that runs through the entire shaft height and is continuously stressed.

[0057] The precast concrete slab has a concrete cross-section without protruding reinforcing bars on its end face 15 facing the vertical splice joint 2. Simultaneously, all longitudinal reinforcing bars within the precast concrete slab terminate within the slab and do not extend into the cavity 14. Therefore, the edge member reinforcing cage 3 can be placed unimpeded into its predetermined position within the cavity 14, and during subsequent construction, it forms a unified load-bearing structure with the cavity 14 and the cast-in-place concrete 4 poured within the vertical splice joint 2.

[0058] In this embodiment, the connecting structure is a truss reinforcement 13, with both ends of the truss reinforcement 13 anchored within the first precast concrete layer 11 and the second precast concrete layer 12, respectively. The truss reinforcement 13 is a triangular truss reinforcement, as shown in the figure. Figure 8 As shown.

[0059] The vertical splicing joint 2 is filled with fine aggregate concrete 8, and a steel shear key is provided at the vertical splicing joint 2 to enhance the horizontal shear resistance of the joint.

[0060] The combined structure has one doorway 9 on each floor, and the elevator shaft is a single-channel shaft.

[0061] Example 2

[0062] The difference between this embodiment and embodiment 1 is that the connection structure is a combination of a slide rail connector 6 and a pull rod 7.

[0063] like Figure 9-10 As shown, the sliding connector 6 is disposed on the corresponding surfaces of the first precast concrete layer 11 and the second precast concrete layer 12. The sliding connector 6 is a groove-type connector pre-embedded in the precast concrete layer, such as... Figure 9 As shown, its cross-section is C-shaped. Figure 10 As shown, the groove has inwardly folded edges on both sides, making the opening width of the groove smaller than the inner width of the groove. The sliding connector 6 is installed along the full height of the precast concrete layer wall, extending from the top to the bottom of the precast concrete layer.

[0064] Both ends of the tie rod 7 are T-shaped ends 51, and the width of the cross head of the T-shaped end 51 is between the width of the slot and the width inside the slot of the sliding connector 6. The two T-shaped ends 51 of the tie rod 7 form a tie connection with the sliding connector 6 on the first precast concrete layer 11 and the second precast concrete layer 12, respectively. The T-shaped ends 51 can slide freely vertically within the sliding connector 6, but are blocked by the slot of the sliding connector 6 in the axial direction of the tie rod 7 and cannot be dislodged, thus achieving a reliable tie.

[0065] Multiple tie rods 7 are arranged vertically at intervals and are welded together to form a frame, which is used to synchronously push into place vertically along the slide-type connector 6. The tie rod 7 segments within the cavity 14 are provided with locally thickened sections to enhance the anchoring force with the cast-in-place concrete. In other embodiments, the tie rod 7 segments within the cavity 14 may also be provided with embossed patterns, notches, or welded shear studs.

[0066] During installation, the frame consisting of multiple tie rods 7 is first pre-installed into the sliding connector 6 of one side of the precast concrete layer, that is, the T-shaped end 51 of one end of each tie rod 7 slides into the upper opening of the sliding connector 6. Then, the other side of the precast concrete layer is hoisted from top to bottom, aligning the sliding connector 6 on its wall surface with the T-shaped end 51 of the other end of each tie rod 7, and vertically sliding into place during the descent. The entire assembly process involves only vertical movement and does not require personnel to operate inside the cavity 14.

[0067] The remaining structures and construction methods are the same as in Example 1.

[0068] Example 3

[0069] The difference between this embodiment and Embodiment 1 is that the shaft cross-section is octagonal. Both the first precast concrete layer 11 and the second precast concrete layer 12 are assembled from eight precast concrete slabs to form an octagonal ring structure. The edge reinforcement cages 3 are located within the cavities 14 at the eight corners. The remaining structure is the same as in Embodiment 1.

[0070] In other embodiments, the cross-section of the shaft may also be circular or other polygonal. Correspondingly, the first precast concrete layer 11 and the second precast concrete layer 12 are assembled by a corresponding number of precast concrete slabs to form a ring structure.

[0071] Example 4

[0072] The difference between this embodiment and Embodiment 1 is that the elevator shaft is a dual-channel shaft. Figure 5 and 7As shown, multiple sets of composite shear walls 1 enclose two parallel rectangular shaft spaces. The first precast concrete layer 11 and the second precast concrete layer 12 are both ring structures formed by assembling multiple precast concrete slabs. Specifically, the outer ring structure is formed by assembling ten precast concrete slabs, and the two inner passages are each formed by assembling four precast concrete slabs.

[0073] The edge member reinforcement cage 3 is arranged at the corner of cavity 14 and in the cavity 14 area corresponding to the T-shaped intersection between the two passages. The edge member reinforcement cage 3 at the T-shaped intersection is also composed of edge member longitudinal bars 31 and edge member stirrups 32, and is placed independently in cavity 14. The combined structure has two door openings 9 on each floor, facing two different elevator hall doors. The rest of the structure is the same as in embodiment 1.

[0074] Example 5

[0075] This embodiment provides a construction method for a precast concrete composite structure, which is based on the precast concrete composite structure described in any one of embodiments 1 to 4, and includes the following steps:

[0076] Step 1: Hoist each precast concrete slab of the first group of composite shear wall 1 into position, assemble them to form the first precast concrete layer 11 and the second precast concrete layer 12, and install the connecting structure to form a cavity 14 between them, and a vertical splicing gap 2 between adjacent precast concrete slabs. Specifically, first hoist each precast concrete slab to form the outer first precast concrete layer 11, then hoist each precast concrete slab to form the inner second precast concrete layer 12, and install the connecting structure truss reinforcement 13 or sliding connector 6 and tie rod 7 between them.

[0077] Step 2: Place the edge member reinforcement cage 3 at the corner of cavity 14. The edge member reinforcement cage 3 includes vertical edge member longitudinal bars 31 and horizontal edge member stirrups 32. The edge member longitudinal bars 31 are formed by connecting multiple vertical bars in the vertical direction through sleeves, and are extended vertically according to design requirements.

[0078] Step 3: Seal the vertical splicing joint 2 by pouring concrete 4 into the cavity 14 and the vertical splicing joint 2, ensuring that the upper end of the longitudinal reinforcement 31 of the edge member extends beyond the top surface of the poured concrete. Specifically, a simple grout-blocking treatment can be used to seal the vertical splicing joint 2, followed by pouring concrete and vibrating it to ensure sufficient length is reserved at the upper end of the longitudinal reinforcement 31 of the edge member to provide a prerequisite for the connection to the next layer.

[0079] Step 4: After the concrete reaches its design strength, the precast concrete slabs of the next set of composite shear wall 1 are hoisted into place and assembled to form the first precast concrete layer 11 and the second precast concrete layer 12. A connecting structure is then installed, and an edge member reinforcement cage 3 is placed at the corner of the cavity 14. The lower end of the edge member longitudinal reinforcement 31 of this edge member reinforcement cage 3 is fixedly connected to the upper end of the edge member longitudinal reinforcement 31 extending from the cavity of the lower layer composite shear wall 1. Specifically, the upper and lower layer edge member longitudinal reinforcement 31 can be fixedly connected by sleeve connection, lap welding, or mechanical connection.

[0080] Step 5: Seal the vertical splicing gap 2, pour concrete 4 into the cavity 14 and vertical splicing gap 2 of the composite shear wall 1, and make the upper end of the longitudinal reinforcement 31 of the edge member extend out of the top surface of the poured concrete.

[0081] Step Six: Repeat Steps Four and Five until the entire wellbore construction is completed.

[0082] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be permuted and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutation and combination. Therefore, the present invention will not describe the technical solutions after permutation and combination one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by the present invention.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A precast concrete composite structure for elevator shafts, characterized in that: It includes multiple sets of composite shear walls (1), each set of composite shear walls (1) is continuously arranged in the vertical direction, and there is a horizontal construction joint (5) between two adjacent sets of composite shear walls (1). Each of the composite shear walls (1) includes a first precast concrete layer (11), a second precast concrete layer (12), and a connecting structure between the first precast concrete layer (11) and the second precast concrete layer (12), wherein the second precast concrete layer (12) is placed inside the first precast concrete layer (11), and there is a cavity (14) between them for cast-in-place concrete. The first precast concrete layer (11) and the second precast concrete layer (12) are both ring structures formed by assembling multiple precast concrete slabs together, and a vertical splicing gap (2) is formed between two adjacent precast concrete slabs. The cavity (14) is provided with a reinforcing cage (3) for edge components, which is arranged at the corner of the cavity (14).

2. A precast concrete composite structure for elevator shafts according to claim 1, characterized in that: The edge member reinforcement cage (3) includes vertical edge member longitudinal bars (31) and horizontal edge member stirrups (32). The edge member longitudinal bars (31) and the edge member stirrups (32) are fixed by binding or welding. The edge member longitudinal bars (31) are formed by connecting multiple vertical bars in the vertical direction and pass through the horizontal construction joint (5).

3. A precast concrete composite structure for elevator shafts according to claim 1, characterized in that: The precast concrete slab has a concrete cross-section without protruding reinforcing bars on the end face (15) facing the vertical splice joint (2).

4. A precast concrete composite structure for elevator shafts according to claim 1, characterized in that: The concrete (4) poured in the cavity (14) and at the vertical splicing gap (2) will cast the edge member steel cage (3), the first precast concrete layer (11) and the second precast concrete layer (12) into a whole that shares the load.

5. A precast concrete composite structure for elevator shafts according to claim 1, characterized in that: The connection structure is a truss steel bar (13), and the two ends of the truss steel bar (13) are respectively anchored in the first precast concrete layer (11) and the second precast concrete layer (12).

6. A precast concrete composite structure for elevator shafts according to claim 1, characterized in that: The connection structure is a combination of a sliding connector (6) and a tie rod (7); the sliding connector (6) is set on the corresponding surfaces of the first precast concrete layer (11) and the second precast concrete layer (12), and the sliding connector (6) is a groove-type connector embedded in the precast concrete layer or a rail-type connector installed on the surface of the precast concrete layer; both ends of the tie rod (7) are T-shaped ends (51), and the two T-shaped ends (51) of the tie rod (7) form a tie connection with the sliding connector (6) on the first precast concrete layer (11) and the second precast concrete layer (12), respectively.

7. A precast concrete composite structure for elevator shafts according to claim 1, characterized in that: The vertical splicing gap (2) is filled with sealant, elastic waterproof material, cement slurry or fine stone concrete (8); when the vertical splicing gap (2) is filled with cement slurry or fine stone concrete, a shear key is provided at the vertical splicing gap (2).

8. A precast concrete composite structure for elevator shafts according to claim 1, characterized in that: The combined structure is provided with at least one doorway (9); the elevator shaft is a single-channel shaft or a double-channel shaft; the cross-section of the shaft formed by the multiple sets of composite shear walls (1) is rectangular, polygonal or circular.

9. A construction method for a precast concrete composite structure for elevator shafts, implemented based on the precast concrete composite structure as described in any one of claims 1 to 8, characterized in that, Includes the following steps: Step 1: Hoist each precast concrete slab of the first group of composite shear wall (1) into place, assemble them to form the first precast concrete layer (11) and the second precast concrete layer (12), and install the connecting structure to form a cavity (14) between the two, and form a vertical splicing gap (2) between two adjacent precast concrete slabs. Step 2: Place an edge member steel cage (3) at the corner of the cavity (14). The edge member steel cage (3) includes vertical edge member longitudinal bars (31) and horizontal edge member stirrups (32). Step 3: Seal the vertical splicing gap (2), pour concrete (4) into the cavity (14) and the vertical splicing gap (2), and make the upper end of the longitudinal reinforcement (31) of the edge member extend out of the top surface of the poured concrete. Step 4: Hoist each precast concrete slab of the next set of composite shear walls (1) into place, assemble them to form the first precast concrete layer (11) and the second precast concrete layer (12), and install the connecting structure to form a cavity (14) between the two, and form a vertical splicing gap (2) between two adjacent precast concrete slabs; place the edge member steel cage (3) at the corner of the cavity (14), and fix the lower end of the edge member longitudinal bar (31) of the edge member steel cage (3) to the upper end of the edge member longitudinal bar (31) extending into the cavity of the lower layer composite shear wall (1) that has been poured; Step 5: Seal the vertical splicing gap (2), pour concrete (4) into the cavity (14) and vertical splicing gap (2) of the composite shear wall (1), and make the upper end of the longitudinal reinforcement (31) of the edge member extend out of the top surface of the poured concrete. Step Six: Repeat Steps Four and Five until the entire wellbore construction is completed.

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