A prefabricated composite wall structure and its construction method

Abstract

A prefabricated composite wall structure and construction method, belonging to the field of building structure technology, includes a first precast concrete layer, a second precast concrete layer, and a tie rod assembly. The first and second precast concrete layers are connected by the tie rod assembly, forming a cavity between them for cast-in-place concrete. The tie rod assembly includes a sliding connector and a tie rod, with at least one end of the tie rod having a T-shaped end. At least one of the first and second precast concrete layers has a sliding connector on its inner side. The sliding connector has a groove with an inlet for the T-shaped end to enter, allowing the T-shaped end to slide vertically to a locking position after entering through the inlet, preventing the T-shaped end from detaching laterally at the locking position. This invention solves the technical problems of poor connection reliability and difficult construction alignment in existing composite wall structures, offering high construction flexibility and standardization.

Description

Technical Field

[0001] This invention relates to a prefabricated composite wall structure and its construction method, belonging to the field of building structure technology. Background Technology

[0002] Composite shear walls typically consist of two precast concrete layers and an intermediate cast-in-place concrete layer, offering advantages such as high industrialization and fast construction speed.

[0003] In current production practices, the common approach is to first fabricate a monolithic steel cage with internal truss reinforcement bars. These truss reinforcement bars connect the load-bearing or structural steel mesh within two layers of precast concrete. Then, the first layer of precast concrete is poured. After it reaches a certain strength, the mold for the second layer is erected, and the second layer is poured. The two layers of precast concrete are not precast separately but are formed sequentially on the same production line, permanently connected as a single unit by the truss reinforcement bars.

[0004] This method has the following problems: First, the two layers cannot be prefabricated at the same time. The second layer can only be constructed after the first layer has reached the required strength, resulting in a long production cycle and long mold occupation time. Second, the two layers are fixed together by truss reinforcement and cannot be transported and stored separately like independent components before being assembled on site, which lacks flexibility. Third, if the wall structure needs to be adjusted on site or subsequent assembly construction is required, this integrated prefabrication method cannot be modified, making it difficult to realize the construction method of prefabricating separately first and then assembling.

[0005] Therefore, there is an urgent need to propose a prefabricated composite wall structure to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of long production cycles, inability to prefabricate and flexibly assemble existing composite wall precast layers, and difficulties in on-site connection and alignment. A brief overview of the invention is provided below to offer a basic understanding of certain aspects of it. 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.

[0007] The technical solution of this invention:

[0008] Option 1: A prefabricated composite wall structure, comprising a first precast concrete layer, a second precast concrete layer, and a tie rod assembly. The first precast concrete layer and the second precast concrete layer are spaced apart, forming a cavity between them for cast-in-place concrete. The first precast concrete layer and the second precast concrete layer are connected by the tie rod assembly.

[0009] The tie rod assembly includes a slide rail connector and a tie rod, and at least one end of the tie rod is provided with a T-shaped end;

[0010] In at least one of the first precast concrete layer and the second precast concrete layer, the sliding connector is provided on the inner side.

[0011] The slide rail connector has a vertically extending groove with an inlet for the T-shaped end to enter, and the groove allows the T-shaped end to slide vertically to a locking position after entering from the inlet, and prevents the T-shaped end from coming out laterally at the locking position.

[0012] Preferably, one end of the tie rod is a T-shaped end, and the other end is an anchoring end. The anchoring end is fixedly connected to the corresponding precast concrete layer, and the T-shaped end is locked in place with the sliding connector set on another precast concrete layer.

[0013] Preferably, both ends of the tie rod are provided with T-shaped ends, and the inner sides of the first precast concrete layer and the second precast concrete layer are provided with sliding connectors, and the two T-shaped ends are respectively engaged and locked with the sliding connectors on the corresponding sides.

[0014] Preferably, the slide rail connector is a variable cross-section slide rail connector, which consists of multiple independent slide rail components arranged at vertical intervals. Each independent slide rail component has a groove including an upper inlet section and a lower locking section. The cross-sectional dimension of the inlet section is larger than that of the T-shaped end to form the inlet. The cross-sectional dimension of the locking section is smaller than that of the T-shaped end to form a constricted structure, thereby preventing the T-shaped end from laterally disengaging at the locked position.

[0015] Preferably, the constriction structure is a shoulder protruding inward from the two side walls of the slide groove, or a hook-shaped part formed by bending the two side walls of the slide groove inward.

[0016] Preferably, the slide rail connector is a continuous slide rail connector with a constant cross-section. The continuous slide rail connector with a constant cross-section is a slide rail that is set along the height direction, and the cross-section of the slide groove remains unchanged along the height direction. The slide groove has a lateral opening, the width of which is smaller than the head width of the T-shaped end. The upper end of the slide groove is provided with an end opening for the T-shaped end to be inserted from top to bottom, and the end opening forms the inlet.

[0017] Preferably, the end opening of the equal-section, full-length slide-type connector is provided with a detachable or openable end baffle.

[0018] Preferably, the first precast concrete layer and / or the second precast concrete layer are provided with reinforcing bars, which are load-bearing reinforcing bars or structural reinforcing bars.

[0019] Preferably, truss reinforcement is provided on the first precast concrete layer and / or the second precast concrete layer.

[0020] Option 2: A construction method for a prefabricated composite wall structure according to any one of claims 1 to 9, comprising the following steps:

[0021] Step 1: Transport the first and second precast concrete layers to the construction site;

[0022] Step 2: Align the T-shaped end of the pull rod with the groove inlet of the corresponding side slide connector;

[0023] Step 3: Allow the T-shaped end to enter the slide groove and slide it vertically to the locking position, so that the T-shaped end is limited in the lateral direction and cannot come out;

[0024] When one end of the tie rod is a T-shaped end and the other end is an anchoring end, the anchoring end remains embedded in the corresponding precast concrete layer, and the T-shaped end cooperates with the sliding connector on another precast concrete layer and slides to the locking position.

[0025] When both ends of the tie rod are T-shaped ends, the two T-shaped ends are respectively inserted into the sliding connectors on the first and second precast concrete layers, and both slide vertically to the locking position.

[0026] When the slide rail connector is a variable cross-section slide rail connector, the T-shaped end first enters the inlet section horizontally, and then slides vertically to the locking section to reach the locking position;

[0027] When the slide rail connector is a continuous slide rail connector with a constant cross-section, the T-shaped end is vertically inserted into the slide groove from the end opening and then slides vertically to the locking position;

[0028] Step 4: Pour cast-in-place concrete into the cavity to form an integral load-bearing structure.

[0029] The present invention has the following beneficial effects:

[0030] 1. The first precast concrete layer and the second precast concrete layer of the present invention are connected by a tie rod assembly. At least one end of the tie rod is provided with a T-shaped end, and at least one precast concrete layer is provided with a sliding connector on the inner side. The two layers can be precast, transported and stored separately, and then assembled on site. The production cycle is short, the mold occupancy time is less, and the construction flexibility is strong.

[0031] 2. The sliding connector of the present invention has a vertically extending groove. After the T-shaped end enters from the groove inlet, it slides vertically to the locking position and prevents the T-shaped end from coming out laterally at the locking position. The connection is reliable, the alignment is easy, the installation speed is fast, and no on-site welding or bolting is required.

[0032] 3. When the present invention uses a variable cross-section sliding connector, the inlet section and the locking section form a variable cross-section structure. After the T-shaped end is inserted from the inlet section, it slides down to the locking section and is automatically locked by the narrowing structure to prevent vertical dislodgement, without the need for additional fasteners.

[0033] 4. When using a continuous slide rail connector with equal cross-section, the lateral opening width of this invention is smaller than the head width of the T-shaped end. After the T-shaped end is inserted from the upper end opening, it cannot be pulled out laterally, making construction convenient and especially suitable for scenarios with a large number of tie rods.

[0034] 5. The tie rod of the present invention can have a T-shaped end at one end and an anchoring end at the other end, or both ends can be T-shaped ends with double-sided sliding connectors. The connection form is flexible and can form a single-sided prefabricated or double-sided prefabricated universal component with a high degree of standardization.

[0035] 6. The truss reinforcement provided on the first and / or second precast concrete layers of the present invention can enhance the overall rigidity of the precast layers, facilitate hoisting, transportation and installation, and at the same time, the truss reinforcement can serve as shear-resistant connectors on the overlapping surfaces, further improving the overall structural integrity. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the assembly of a prefabricated composite wall structure as described in Example 1;

[0037] Figure 2 This is a structural schematic diagram of a variable cross-section slide rail connector;

[0038] Figure 3 It is a 3D view of a variable cross-section slide rail connector;

[0039] Figure 4 This is a schematic diagram of the hook-shaped part of the variable cross-section slide rail connector;

[0040] Figure 5 This is a structural diagram showing that the two ends of the tie rod are T-shaped ends and anchoring ends, respectively.

[0041] Figure 6 This is a schematic diagram showing the fit between the T-shaped end and the lead-in section;

[0042] Figure 7 This is a schematic diagram showing the fit between the T-shaped end and the locking section;

[0043] Figure 8 This is the front view of a continuous slide-type connector with a uniform cross-section;

[0044] Figure 9 It is a three-dimensional view of a continuous slide-type connector with a uniform cross-section;

[0045] Figure 10 This is a structural schematic diagram of a continuous slide-type connector with a constant cross-section;

[0046] Figure 11 This is a schematic diagram showing the fit between the T-shaped end and the side opening;

[0047] Figure 12 This is a diagram showing the structure of the tie rod with T-shaped ends at both ends;

[0048] Figure 13 This is a schematic diagram illustrating the assembly of a prefabricated composite wall structure as described in Example 3;

[0049] Figure 14 This is a schematic diagram showing the connection between the tie rod and the second precast concrete layer;

[0050] Figure 15 This is a schematic diagram showing the fit between the variable cross-section sliding connector and the first precast concrete layer.

[0051] Figure 16 This is a schematic diagram showing the fit between the constant cross-section, continuous sliding track connector and the first precast concrete layer.

[0052] Figure 17 This is a schematic diagram of the reinforcement arrangement.

[0053] In the figure, 1-first precast concrete layer, 2-second precast concrete layer, 3-slide rail connector, 4-tie rod, 5-cavity, 6-reinforcing bar, 7-truss reinforcement, 31-variable cross-section slide rail connector, 311-inlet section, 312-locking section, 313-shoulder, 314-hook-shaped part, 32-uniform cross-section continuous slide rail connector, 321-lateral opening, 322-end opening, 41-T-shaped end, 42-anchoring end. Detailed Implementation

[0054] 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.

[0055] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections (i.e., non-detachable connections) include, but are not limited to, conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include, but are not limited to, conventional disassembly methods such as threaded connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can always be found to achieve the function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a hinged connection can be chosen for detachable connections.

[0056] Example 1: Combination Figure 1 , 2 Sections 3, 5, 6, 7, 14, and 15 describe this embodiment. This embodiment provides a prefabricated composite wall structure where the tie rod 4 has a T-shaped end 41 at one end and an anchoring end 42 at the other. The sliding connector 3 uses a variable cross-section sliding connector 31. Specifically, it includes a first precast concrete layer 1, a second precast concrete layer 2, and a tie rod assembly. The first precast concrete layer 1 and the second precast concrete layer 2 are spaced apart, forming a cavity 5 between them for cast-in-place concrete. The first precast concrete layer 1 and the second precast concrete layer 2 are connected by the tie rod assembly.

[0057] The tie rod assembly includes a sliding connector 3 and a tie rod 4. One end of the tie rod 4 has a T-shaped end 41, and the other end is an anchoring end 42. The sliding connector 3 is located on the inner side of the first precast concrete layer 1, and the anchoring end 42 is embedded in the second precast concrete layer 2. The T-shaped end 41 engages with the sliding connector 3 on the first precast concrete layer 1 for locking. The anchoring end 42 is specifically a hook, but can also be replaced with a pier, nut, or welded anchor plate.

[0058] In this embodiment, the slide rail connector 3 is a variable cross-section slide rail connector 31. This variable cross-section slide rail connector 31 consists of multiple independent slide rail components arranged vertically at intervals. Each independent slide rail component includes an upper guide section 311 and a lower locking section 312. The cross-sectional dimension of the guide section 311 is larger than the dimension of the T-shaped end 41, forming an entrance for the T-shaped end 41 to enter. The cross-sectional dimension of the locking section 312 is smaller than the dimension of the T-shaped end 41, and its side walls protrude inward to form shoulders 313, constituting a constricted structure. When the T-shaped end 41 slides into the locking section 312, the shoulders 313 prevent the T-shaped end 41 from disengaging laterally, thus achieving locking.

[0059] Both the first precast concrete layer 1 and the second precast concrete layer 2 are reinforced with steel bars 6.

[0060] During construction, the first precast concrete layer 1 and the second precast concrete layer 2 are transported to the construction site. The anchoring end 42 of the tie rod 4 on the second precast concrete layer 2 is pre-embedded, and the T-shaped end 41 is exposed. The T-shaped end 41 is aligned with the guide section 311 of the variable cross-section sliding connector 31 on the first precast concrete layer 1, and moved horizontally to allow the T-shaped end 41 to enter the guide section 311. Then, it is moved vertically to allow the T-shaped end 41 to slide down to the locking section 312, where the shoulder 313 locks it in place. Afterward, cast-in-place concrete is poured into the cavity 5 to form an integral load-bearing structure.

[0061] This embodiment achieves separate prefabrication and rapid on-site assembly of two precast concrete layers by anchoring on one side and locking on the other side via a sliding track.

[0062] Example 2: Combination Figure 1, 5 Sections 8, 9, 10, 11, 14, and 16 describe this embodiment, which is a prefabricated composite wall structure. The difference between this embodiment and Embodiment 1 is that the sliding connector 3 adopts a continuous sliding connector 32 with a constant cross-section. Specifically, it includes a first precast concrete layer 1, a second precast concrete layer 2, and a tie rod assembly. One end of the tie rod 4 is a T-shaped end 41, and the other end is an anchoring end 42, which is embedded in the second precast concrete layer 2.

[0063] In this embodiment, the slide-type connector 3 is a continuous slide-type connector 32 with a constant cross-section. This continuous slide-type connector 32 is a slide that extends along the entire height direction, and the cross-section of its groove remains constant along the height direction. The groove has a lateral opening 321, the width of which is smaller than the head width of the T-shaped end 41. The upper end of the groove has an end opening 322 for the T-shaped end 41 to be inserted from top to bottom, forming an inlet. A removable end baffle may also be provided at the end opening 322 to prevent the T-shaped end 41 from accidentally detaching before concrete pouring.

[0064] During construction, the T-shaped end 41 is vertically inserted into the groove through the end opening 322, and then slides vertically to the predetermined locking position. Since the width of the lateral opening 321 is always smaller than the width of the head of the T-shaped end 41, the T-shaped end 41 cannot be dislodged laterally at any position, ensuring reliable locking. Afterwards, cast-in-place concrete is poured into the cavity 5.

[0065] This embodiment is particularly suitable for scenarios where there are a large number of tie rods and connection points need to be continuously arranged along the height of the wall. The T-shaped end 41 can be inserted sequentially from the upper opening and slide freely in the groove to the target position, making construction convenient and efficient.

[0066] Example 3: Combination Figure 12-13 This embodiment describes a prefabricated composite wall structure. In this embodiment, the tie rod 4 has T-shaped ends 41 at both ends, and the sliding connector 3 is a variable cross-section sliding connector 31. Specifically, it includes a first precast concrete layer 1 and a second precast concrete layer 2, which are spaced apart, forming a cavity 5 in between. Both ends of the tie rod 4 are provided with T-shaped ends 41. Sliding connectors 3 are provided on the inner sides of both the first precast concrete layer 1 and the second precast concrete layer 2. In this embodiment, the sliding connector 3 is a variable cross-section sliding connector 31. The two T-shaped ends 41 respectively engage and lock with the corresponding variable cross-section sliding connector 31.

[0067] In this embodiment, the first precast concrete layer 1 and the second precast concrete layer 2 are precast components with identical structures, arranged symmetrically. The variable cross-section sliding connectors 31 on both sides are in one-to-one correspondence, each having an inlet section 311 and a locking section 312 with a shoulder 313. The tie rod 4 is an independent component with T-shaped ends 41 at both ends.

[0068] During construction, two identical precast components are symmetrically arranged in predetermined positions. A tie rod 4, with T-shaped ends 41 at both ends, is used. One T-shaped end 41 is aligned with the guide section 311 of the variable cross-section sliding connector 31 on the first precast concrete layer 1, and the other T-shaped end 41 is aligned with the guide section 311 of the variable cross-section sliding connector 31 on the second precast concrete layer 2. Horizontal movement causes both T-shaped ends 41 to simultaneously enter their respective guide sections 311, followed by vertical movement to allow both T-shaped ends 41 to slide synchronously to their respective locking sections 312, achieving double-sided locking. Finally, cast-in-place concrete is poured into the cavity 5.

[0069] This embodiment achieves a symmetrical arrangement of prefabricated universal components on both sides and independent tie rod connection. The components are highly standardized, and the prefabricated layers on both sides can be prefabricated on different production lines or at different times. On-site, only tie rod locking is required, and no embedded connectors need to be exposed.

[0070] Example 4: Combination Figure 12-13 This embodiment describes a prefabricated composite wall structure. The difference between this embodiment and Embodiment 3 is that the sliding connector 3 uses a continuous sliding connector 32 with a uniform cross-section. Specifically, it includes a first precast concrete layer 1 and a second precast concrete layer 2, spaced apart and forming a cavity 5 in between. Both ends of the tie rod 4 are provided with T-shaped ends 41. The inner sides of both the first precast concrete layer 1 and the second precast concrete layer 2 are provided with continuous sliding connectors 32 with uniform cross-sections. The two T-shaped ends 41 respectively engage and lock with the corresponding continuous sliding connectors 32 on their respective sides.

[0071] The first precast concrete layer 1 and the second precast concrete layer 2 are precast components with the same structure, arranged symmetrically. The width of the lateral openings 321 of the continuous sliding track connectors 32 with equal cross-sections on both sides is smaller than the head width of the T-shaped end 41, and the upper end is provided with an end opening 322.

[0072] During construction, two identical precast components are symmetrically arranged. A tie rod 4 with T-shaped ends 41 at both ends is taken and vertically inserted into the end openings 322 of the equal-section, continuous sliding connectors 32 on both sides. Then, it slides vertically to its predetermined locking position to achieve double-sided locking. After that, concrete is poured into the cavity 5.

[0073] This embodiment combines the standardization advantages of prefabricated universal components on both sides with the convenient construction features of a continuous slide with equal cross-section, making it suitable for projects with high requirements for component standardization and construction efficiency.

[0074] Example 5: Combination Figure 1 , 4 13 and Figure 17 This embodiment describes a prefabricated composite wall structure. Based on any of the above embodiments, this embodiment further defines the specific form of the narrowing structure of the sliding connector 3.

[0075] When the slide rail connector 3 is a variable cross-section slide rail connector 31, the constriction structure of the locking section 312 can employ a shoulder 313 or a hook-shaped portion 314 formed by bending the side walls of the slide rail inward. The hook-shaped portion 314 also makes the cross-sectional dimension of the locking section 312 smaller than the dimension of the T-shaped end 41. After the T-shaped end 41 slides into the locking section 312, it is hooked and limited by the hook-shaped portion 314, preventing lateral disengagement. Compared to the shoulder 313, the hook-shaped portion 314 provides a larger contact area and a more uniform force distribution.

[0076] Truss reinforcement 7 is also provided on the first precast concrete layer 1 and / or the second precast concrete layer 2. The truss reinforcement 7 is partially exposed on the surface of the precast layer, which enhances the overall rigidity of the precast layer during hoisting and transportation, and interlocks with the concrete after the concrete is poured to form a composite surface shear connection, further improving the overall structure.

[0077] This embodiment provides an alternative form of the narrowed structure and adds a truss reinforcement scheme, which is suitable for wall projects with high requirements for structural integrity.

[0078] Example 6: A construction method for a prefabricated composite wall structure according to this embodiment includes the following steps:

[0079] Step 1: Transport the first precast concrete layer 1 and the second precast concrete layer 2 to the construction site. The two precast concrete layers have been precast separately in the factory. The first precast concrete layer 1 has a pre-embedded sliding connector 3 on its inner side, and the second precast concrete layer 2 has a pre-embedded anchor end 42 or similarly pre-embedded sliding connector 3 on its inner side. When both ends of the tie rod 4 are T-shaped ends 41, the tie rod 4 is transported as an independent component.

[0080] Step 2: Align the T-shaped end 41 of the tie rod 4 with the groove inlet of the corresponding side slide rail connector 3. When one end of the tie rod 4 is a T-shaped end 41 and the other end is an anchoring end 42, the anchoring end 42 has been pre-embedded in the second precast concrete layer 2 in the factory. Align the exposed T-shaped end 41 with the inlet of the slide rail connector 3 on the first precast concrete layer 1.

[0081] When both ends of the tie rod 4 are T-shaped ends 41, align the T-shaped end 41 of one end of the independent tie rod 4 with the entrance of the slide rail connector 3 on the first precast concrete layer 1, and align the T-shaped end 41 of the other end with the entrance of the slide rail connector 3 on the second precast concrete layer 2.

[0082] Step 3: Allow the T-shaped end 41 to enter the slide groove and slide it vertically to the locking position, so that the T-shaped end 41 is limited in the lateral direction and cannot be dislodged.

[0083] Specifically, when the slide rail connector 3 is a variable cross-section slide rail connector 31, the T-shaped end 41 first enters the inlet section 311 horizontally, and then slides vertically to the locking section 312 to reach the locking position. The constriction structure of the locking section 312 prevents the T-shaped end 41 from coming out laterally.

[0084] When the slide rail connector 3 is a continuous slide rail connector 32 with equal cross-section, the T-shaped end 41 is vertically inserted into the slide groove from the end opening 322, and then slides vertically to the locking position. The width of the side opening 321 is smaller than the width of the head of the T-shaped end 41, so that it cannot be dislodged laterally.

[0085] Step 4: Pour cast-in-place concrete into cavity 5 to form an integral load-bearing structure.

[0086] When the first precast concrete layer 1 and the second precast concrete layer 2 are identical components, the two identical components are arranged symmetrically and connected by tie rods 4 with T-shaped ends 41 at both ends, and the installation is completed according to steps two to four.

[0087] 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.

[0088] 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 prefabricated composite wall structure, characterized in that: It includes a first precast concrete layer (1), a second precast concrete layer (2), and a tie rod assembly. The first precast concrete layer (1) and the second precast concrete layer (2) are spaced apart, forming a cavity (5) for cast-in-place concrete between them. The first precast concrete layer (1) and the second precast concrete layer (2) are connected by the tie rod assembly. The tie rod assembly includes a slide rail connector (3) and a tie rod (4), and at least one end of the tie rod (4) is provided with a T-shaped end (41). In the first precast concrete layer (1) and the second precast concrete layer (2), at least one of them is provided with the sliding connector (3) on its inner side. The slide rail connector (3) has a vertically extending groove with an inlet for the T-shaped end (41) to enter, and the groove allows the T-shaped end (41) to slide vertically to a locking position after entering from the inlet, and prevents the T-shaped end (41) from coming out laterally at the locking position.

2. The prefabricated composite wall structure according to claim 1, characterized in that: One end of the tie rod is the T-shaped end (41), and the other end is the anchoring end (42). The anchoring end (42) is fixedly connected to the corresponding precast concrete layer, and the T-shaped end (41) is locked in place with the sliding connector (3) set on another precast concrete layer.

3. The prefabricated composite wall structure according to claim 1, characterized in that: Both ends of the tie rod are provided with T-shaped ends (41), and the inner sides of the first precast concrete layer (1) and the second precast concrete layer (2) are provided with sliding connectors (3). The two T-shaped ends (41) are respectively engaged and locked with the sliding connectors (3) on the corresponding sides.

4. A prefabricated composite wall structure according to any one of claims 1-3, characterized in that: The slide rail connector (3) is a variable cross-section slide rail connector (31). The variable cross-section slide rail connector (31) consists of multiple independent slide rail components arranged at vertical intervals. Each independent slide rail component has a groove including an upper inlet section (311) and a lower locking section (312). The cross-sectional dimension of the inlet section (311) is larger than that of the T-shaped end (41) to form the inlet. The cross-sectional dimension of the locking section (312) is smaller than that of the T-shaped end (41) to form a constricted structure, thereby preventing the T-shaped end (41) from coming out laterally at the locking position.

5. A prefabricated composite wall structure according to claim 4, characterized in that: The constriction structure is either a shoulder (313) protruding inward from the two side walls of the slide groove, or a hook-shaped part (314) formed by bending the two side walls of the slide groove inward.

6. A prefabricated composite wall structure according to any one of claims 1-3, characterized in that: The slide rail connector (3) is a continuous slide rail connector (32) with equal cross-section. The continuous slide rail connector (32) with equal cross-section is a slide rail that is set along the height direction. The cross-section of the slide rail remains unchanged along the height direction. The slide rail has a lateral opening (321). The width of the lateral opening (321) is smaller than the head width of the T-shaped end (41). The upper end of the slide rail is provided with an end opening (322) for the T-shaped end (41) to be inserted from top to bottom. The end opening (322) forms the entrance.

7. A prefabricated composite wall structure according to claim 6, characterized in that: The end opening (322) of the equal cross-section continuous slide connector (32) is provided with a detachable or openable end baffle.

8. A prefabricated composite wall structure according to claim 1, characterized in that: The first precast concrete layer (1) and / or the second precast concrete layer (2) are provided with reinforcing bars (6), which are load-bearing reinforcing bars or structural reinforcing bars.

9. A prefabricated composite wall structure according to claim 1, characterized in that: Truss reinforcement (7) is provided on the first precast concrete layer (1) and / or the second precast concrete layer (2).

10. A construction method for a prefabricated composite wall structure according to any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: Transport the first precast concrete layer (1) and the second precast concrete layer (2) to the construction site; Step 2: Align the T-shaped end (41) of the pull rod (4) with the groove inlet of the corresponding side slide connector (3); Step 3: Allow the T-shaped end (41) to enter the slide groove and slide it vertically to the locking position, so that the T-shaped end (41) is limited in the lateral direction and cannot come out; When one end of the tie rod (4) is a T-shaped end (41) and the other end is an anchor end (42), the anchor end (42) is embedded in the corresponding precast concrete layer, and the T-shaped end (41) cooperates with the sliding connector (3) on another precast concrete layer and slides to the locking position. When both ends of the tie rod (4) are T-shaped ends (41), the two T-shaped ends (41) are respectively inserted into the sliding connectors (3) on the first precast concrete layer (1) and the second precast concrete layer (2), and both slide vertically to the locking position; When the slide rail connector (3) is a variable cross section slide rail connector (31), the T-shaped end (41) first enters the inlet section (311) horizontally, and then slides vertically to the locking section (312) to reach the locking position; When the slide rail connector (3) is a continuous slide rail connector (32) with equal cross-section, the T-shaped end (41) is vertically inserted into the slide groove from the end opening (322) and then slides vertically to the locking position; Step 4: Pour cast-in-place concrete into the cavity (5) to form an integral load-bearing structure.

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