PC prefabricated slab joint installation flatness control device and using method thereof

Abstract

The invention provides a PC prefabricated slab joint installation flatness control device and a using method thereof. The PC prefabricated slab joint installation flatness control device comprises a leveling device penetrating through a slab joint between any two adjacent PC prefabricated slabs. The leveling device comprises a tightening main pull rod penetrating through the slab joint, a bottom leveling assembly connected to the exposed first end of the tightening main pull rod, and a top flattening assembly connected to the exposed second end of the tightening main pull rod. In the application, the bottom leveling assembly and the top flattening assembly are mutually matched and tightened by rotating and tightening the main pull rod, so that the two adjacent PC prefabricated slabs are positioned on the same horizontal mounting surface, the problem of high-low dislocation between slab joints is solved, the overall disassembly and assembly are convenient, and the turnover use is flexible. Besides, the invention further provides a using method of the PC prefabricated slab joint installation flatness control device, and by means of the method, construction convenience and construction efficiency are greatly improved while the construction quality is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of prefabricated buildings, and in particular to a PC prefabricated panel joint installation flatness control device and a method for using the device. Background Art

[0002] PC precast panels refer to concrete products that are processed and produced in a standardized and mechanized manner in a factory. In contrast, traditional cast-in-place concrete requires many processes such as on-site mold making, on-site pouring and on-site maintenance, which greatly increases the construction time. Precast concrete panels are currently installed in a prefabricated and spliced ​​manner and are widely used in prefabricated buildings and other fields.

[0003] However, when the PC prefabricated panels are spliced ​​one by one, the installation of the PC prefabricated panels has insufficient horizontal accuracy of the support frame, resulting in high and low misaligned gaps between adjacent panels at the joints of the prefabricated panels, causing the flatness to exceed the standard, affecting the construction quality and later decoration; and when leveling adjacent PC prefabricated panels, on-site construction personnel need to add pads to perform tedious leveling operations, which greatly affects the construction efficiency. The splicing stability of adjacent PC prefabricated panels is poor, affecting the later pouring of the cast-in-place layer; for this reason, a convenient disassembly and leveling and reusable joint installation flatness control device is needed to improve the construction quality and construction efficiency. Summary of the invention

[0004] The present application provides a PC prefabricated panel joint installation flatness control device and a method for using the same, which enables quick and convenient disassembly and assembly, precise leveling operations, and can be used repeatedly to ensure construction quality and speed up construction efficiency.

[0005] In the first aspect, the PC prefabricated panel joint installation flatness control device provided by the present application comprises: a leveling device passing along the panel seam between any two adjacent PC prefabricated panels; the leveling device comprises: a tightening main tie rod passing through the panel seam, a bottom leveling component connected to the exposed first end of the tightening main tie rod, and a top flattening component connected to the exposed second end of the tightening main tie rod; wherein the bottom leveling component comprises a leveling beam fitted between the bottom planes of the two corresponding adjacent PC prefabricated panels; the top flattening component comprises a door-type frame; the door-type frame has two vertical legs that press against the top planes of the two corresponding adjacent PC prefabricated panels; The exposed first end of the tightening main pull rod has a first threaded section threadedly connected to the leveling beam, and the exposed second end of the tightening main pull rod has a second threaded section threadedly connected to the portal frame; the first threaded section and the second threaded section are both interspersed with tightening torsion bars for applying force; when any tightening torsion bar drives the tightening main pull rod to rotate, the leveling beam and the portal frame move away from or approach each other; the leveling device also includes a plurality of protective covers, and the plurality of protective covers are correspondingly slidably mounted on the two vertical legs and the middle section of the tightening main pull rod, and the bottoms of the plurality of protective covers are all in contact with the top planes of the corresponding PC prefabricated panels.

[0006] In the present application, when the tightening main pull rod is driven to rotate by the tightening torsion rod at any end, the portal frame and the leveling are brought closer to each other laterally to apply the leveling force. Under the continuous pressure of the leveling force, the high and low misaligned plate seams of the two adjacent PC prefabricated panels are brought closer to each other and leveled. The overall leveling method is simple, and has the advantages of easy disassembly and assembly and flexible turnover. At the same time, the provision of the protective cover prevents condensation with the cast-in-place layer, making it easy to dismantle and reuse multiple times.

[0007] In a specific implementation scheme, the lower surface of the leveling beam is connected with a first nut, the first thread segment passes through the leveling beam and is threadedly connected to the first nut. A hole is opened on the leveling beam and connected to the first nut to achieve quick installation and adjustment.

[0008] In a specific possible implementation scheme, the door-type frame includes: the two vertical legs, and a cross brace connected between the tops of the two vertical legs; wherein the upper surface of the cross brace is connected with a second nut, and the second threaded section passes through the cross brace and is threadedly connected with the second nut. A hole is opened on the cross brace and connected with the second nut to achieve quick installation and adjustment.

[0009] In a specific possible implementation, when the first thread segment and the second thread segment are both inserted with a tightening torque rod for applying force, a first insertion hole is transversely penetrated on the first thread segment, and the first tightening torque rod is plugged into the first insertion hole; a second insertion hole is transversely penetrated on the second thread segment, and the second tightening torque rod is plugged into the second insertion hole. The force can be adjusted in both directions, and the overall convenience is greatly improved.

[0010] In a specific implementation scheme, the first thread segment and the second thread segment have opposite thread directions. When the left-handed thread and the right-handed thread are respectively set, the accuracy of applying the leveling force and the convenience of quick removal are guaranteed.

[0011] In a specific implementation scheme, the first nut is welded to the center of the leveling beam; the second nut is welded to the center of the cross brace, and the first nut and the second nut are located at the same center. The force of the leveling force is evenly distributed.

[0012] In a specific implementation scheme, the length of the tightening main tie rod is ≥600mm, the height of the door frame is ≥300mm, and the lengths of the first thread segment and the second thread segment are both greater than 120mm. By selecting appropriate sizes, the plate seam leveling operation of various types of PC prefabricated panels can be matched.

[0013] In a specific embodiment, the plurality of protective sleeves are all stainless steel sleeves or PVC sleeves, which are not easy to condense with the cast-in-place layer and are easy to remove.

[0014] In a second aspect, a method for using a PC prefabricated panel joint installation flatness control device includes the method for using the above-mentioned leveling device, comprising the following steps: S1. Reserve installation holes at the joints of any two adjacent PC prefabricated panels; S2, the leveling beam is threadedly connected to the first threaded section, and the tightening main pull rod passes through the installation hole from bottom to top; S3. Put protective covers on the two vertical legs and the tightening main pull rod, and the door frame body is threadedly connected to the second threaded section; S4, inserting and tightening the torsion bar through the first thread segment and the second thread segment, and applying force to pre-tighten; S5, applying force to rotate the fastening torsion bar of the first threaded section, and the joint between the two adjacent PC prefabricated panels is leveled and then positioned and locked; S6. Pour the cast-in-place layer and remove the leveling device after curing for 12 hours.

[0015] In a specific possible implementation method, semicircular grooves are reserved on both sides of any PC prefabricated board; The installation hole is formed by overlapping the semicircular grooves between any two adjacent PC prefabricated plates.

[0016] In the present application, by adopting the above method, it is possible to ensure construction quality, improve construction efficiency, and ensure quick and convenient disassembly and assembly, as well as flexible turnover and usability of the leveling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the splicing state of the PC prefabricated panels provided in the embodiment of the present application; Figure 2 A schematic diagram of the structure of a PC prefabricated panel joint installation flatness control device provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of a leveling beam provided in an embodiment of the present application; Figure 4 A schematic diagram of the structure of a door-type frame provided in an embodiment of the present application.

[0018] Figure Number: PC prefabricated plate-100, semicircular groove-101, installation hole-110; Cast-in-place layer - 200; Tighten the main pull rod-10, the first threaded section-11, the first insertion hole-111, the second threaded section-12, and the second insertion hole-121; Leveling beam-20, first nut-21; First tightening torsion bar-30; Horizontal support-40, vertical support foot-41, second nut-42; Second tightening torsion bar-50; Tie rod protection cover -60; Foot protectors - 70. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0020] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should be understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] In order to facilitate understanding of the PC prefabricated board joint installation flatness control device and its use method provided by the embodiment of the present application, first explain its application scenario. When the PC prefabricated boards are spliced ​​in sequence, the PC prefabricated board installation is insufficient in horizontal precision of the support frame, resulting in high and low misaligned gaps between adjacent boards at the prefabricated board joints, causing the flatness to exceed the standard, affecting the construction quality and later decoration; and when the adjacent PC prefabricated boards are leveled, the on-site construction personnel need to add pads for cumbersome leveling operations, which greatly affects the construction efficiency. The adjacent PC prefabricated boards have poor splicing stability, which affects the later pouring of the cast-in-place layer; for this reason, a convenient disassembly, leveling and reusable joint installation flatness control device is needed to improve the construction quality and construction efficiency. In view of this, the present application provides a PC prefabricated board joint installation flatness control device and its use method, which realizes fast and convenient disassembly, precise leveling operations, and can be used repeatedly to ensure construction quality and speed up construction efficiency.

[0022] refer to Figure 1 As shown in Figure 1 Schematic diagram of the splicing state of the PC prefabricated board 100 provided in the embodiment of the present application. Figure 1It can be seen that after the two adjacent PC prefabricated panels 100 are spliced, an installation hole 110 for assembling the joint installation flatness control device in this application is formed in the panel seam; when multiple installation holes 110 are formed between the two adjacent PC prefabricated panels 100, semicircular grooves 101 are relatively reserved on both sides of any PC prefabricated panel 100 in this application; the semicircular grooves 101 are prefabricated in the mold form during the factory processing of the PC prefabricated panels 100, and multiple semicircular grooves 101 can be set on both sides of each PC prefabricated panel 100 according to different lengths, and the semicircular grooves 101 between any two adjacent PC prefabricated panels 100 overlap to form an installation hole 110. The reservation of the installation hole 110 allows the joint installation flatness control device to pass through the two adjacent PC prefabricated panels 100 along the panel seam, thereby realizing the application of a two-way leveling force. It should be specifically explained that the joint installation flatness control device in the present application can also be used in many prefabricated buildings such as prefabricated wall panels, steel structure panels, wooden panels, etc. By reserving the installation holes 110 and filling the installation holes 110 later, the decoration construction requirements are met. Here, only the height adjustment method of the panel seam of the PC prefabricated panel 100 is described in detail.

[0023] Continue to refer Figure 2 As shown in , the PC prefabricated panel joint installation flatness control device provided in the present application includes: a leveling device passing along the panel seam between any two adjacent PC prefabricated panels 100; the leveling device in the present application has a low manufacturing cost and is used in the installation process of the PC prefabricated panels 100 through mass production to ensure that the bottom surface flatness of multiple PC prefabricated panels 100 is consistent, the overall adjustment method is simple and convenient, and has a high degree of flexible turnover, thereby reducing construction costs and improving construction efficiency.

[0024] The leveling device includes: a tightening main pull rod 10 that penetrates the plate seam, and the tightening main pull rod 10 penetrates the plate seam along the installation hole 110. In a specific embodiment of the present application, the tightening main pull rod 10 is made of 32mm diameter round steel, which is easy to obtain, and the length of the tightening main pull rod 10 is 600mm, which has a large adjustment space. The tightening main tie rod 10 serves as the leveling force transmission body in the present application. The first end of the tightening main tie rod 10 exposed at the bottom of the PC prefabricated board 100 is connected to the bottom leveling component, and the second end of the tightening main tie rod 10 exposed at the top of the PC prefabricated board 100 is connected to the top flattening component; and the bottom leveling component and the top flattening component are both threadedly connected to the tightening main tie rod 10, so that when the tightening main tie rod 10 is in a rotating state, the bottom leveling component simultaneously applies a lifting leveling force to the bottom planes of the two adjacent PC prefabricated boards 100, and the top flattening component simultaneously applies a downward leveling force to the top planes of the two adjacent PC prefabricated boards 100. The two relative leveling forces are gradually applied to improve the flatness accuracy between the boards.

[0025] Combination Figure 2 and Figure 3 As shown in , the bottom leveling assembly in the present application includes a leveling beam 20 that is fitted between the bottom planes of two corresponding adjacent PC prefabricated panels 100; in a specific embodiment of the present application, the leveling beam 20 uses a 50mm wide, 30mm thick, and 300mm long steel bar as the main body of the leveling beam 20, and the leveling beam 20 is preferably in a cross-relationship with the plate seam to achieve a stronger fit.

[0026] The exposed first end of the tightening main tie rod 10 has a first threaded section 11 threadedly connected to the leveling beam 20. The lower surface of the leveling beam 20 is connected to a first nut 21. The first threaded section 11 passes through the leveling beam 20 and is threadedly connected to the first nut 21. A hole is opened on the leveling beam 20 and connected to the first nut 21, so that quick installation and adjustment are achieved.

[0027] It can be seen that after the first nut 21 of the leveling beam 20 is threadedly connected with the first threaded section 11, the main tension rod 10 is tightened to pass through the installation hole 110 from bottom to top, and the leveling beam 20 is pre-fitted to the plate seam. At this time, the installation beam is in an inclined state when the plate seam is misaligned. By installing the top flattening component on the exposed second end of the main tension rod 10 and continuously applying the pre-tightening force, the top flattening component and the leveling beam 20 cooperate with each other, so that the leveling beam 20 is gradually located in a horizontal state, thereby improving the flatness accuracy of the PC prefabricated panel 100 with high and low misalignment.

[0028] For reference Figure 2 and Figure 4 When the top flattening assembly is specifically set, the top flattening assembly includes a door-shaped frame; the door-shaped frame, the exposed second end of the tightening main tie rod 10 has a second threaded section 12 threadedly connected to the door-shaped frame. The second threaded section 12 is threadedly connected to the door-shaped frame, and during the rotation of the tightening main tie rod 10, the door-shaped frame and the leveling beam 20 are moved away from or close to each other, thereby achieving convenience in leveling and dismantling operations.

[0029] Specifically, the portal frame includes: two vertical legs 41, and a cross brace 40 connected between the tops of the two vertical legs 41; wherein, the upper surface of the cross brace 40 is connected with a second nut 42, and the second threaded section 12 passes through the cross brace 40 and is threadedly connected to the second nut 42. The cross brace 40 is provided with a hole and connected with the second nut 42 to achieve quick installation and adjustment. In a specific implementation of the present application, the cross brace 40 and the two vertical legs 41 are made of 50mm wide, 30mm thick, and 300mm long steel strips to form a portal frame of 300mm high and 300mm wide; of course, in other embodiments of the present application, the portal frame can also be formed by welding square steel or round steel to prevent its deformation when a large leveling force is applied.

[0030] In the embodiment of the present application, two vertical legs 41 press against the top planes of two adjacent PC prefabricated panels 100; the first thread segment 11 and the second thread segment 12 are both interspersed with tightening torsion bars for applying force; when any tightening torsion bar drives the tightening main pull rod 10 to rotate, the leveling beam 20 and the portal frame move away from or closer to each other.

[0031] When the leveling beam 20 and the door frame are moved away from or closer to each other, the thread directions of the first thread segment 11 and the second thread segment 12 in the present application are opposite. When the left-handed thread and the right-handed thread are respectively set, the accuracy of applying the leveling force and the convenience of quick removal are guaranteed.

[0032] In addition, in order to realize the bidirectional convenient force adjustment in the present application, when the first thread segment 11 and the second thread segment 12 are both inserted with a tightening torque rod for force application, a first insertion hole 111 is transversely penetrated on the first thread segment 11, and the first tightening torque rod 30 is plugged and connected in the first insertion hole 111; a second insertion hole 121 is transversely penetrated on the second thread segment 12, and the second tightening torque rod 50 is plugged and connected in the second insertion hole 121. Force application can be adjusted in both directions, and the overall convenience is greatly improved.

[0033] Continue reading Figure 2 As shown in the figure, the first nut 21 is welded to the center of the leveling beam 20; the second nut 42 is welded to the center of the horizontal support 40, and the first nut 21 and the second nut 42 are located at the same center of a circle, so that the force applied to the leveling force is evenly distributed.

[0034] In the present application, in the assembly and adjustment state of the portal frame, the flatness accuracy between the plates is improved while the construction work of casting the cast-in-place layer 200 on the top plane of the PC prefabricated plate 100 is not affected; in order to prevent the concrete from condensing between the tightening main tie rod 10 and the two vertical legs 41 when casting the cast-in-place layer 200, the leveling device in the present application also includes three protective sleeves, which are respectively a tie rod protective sleeve 60 slidably sleeved on the middle section of the tightening main tie rod 10, and a leg protective sleeve 70 slidably sleeved on the two vertical legs 41 one by one, and the bottoms of the tie rod protective sleeve 60 and the two leg protective sleeves 70 are both in contact with the top plane of the corresponding PC prefabricated plate 100, so as not to affect the casting of the cast-in-place layer 200; at the same time, the tie rod protective sleeve 60 and the two leg protective sleeves 70 are both stainless steel sleeves or PVC sleeves. Using materials that are not easy to condense with concrete as protective sleeves is convenient for later removal.

[0035] In the present application, when the tightening main pull rod 10 is driven to rotate by the tightening torsion rod at any end, the door-shaped frame and the leveling are brought closer to each other laterally to apply the leveling force. Under the continuous pressure of the leveling force, the high and low misaligned plate seams of the two adjacent PC prefabricated panels 100 are brought closer to each other and leveled. The overall leveling method is simple, and has the advantages of convenient disassembly and assembly and flexible turnover. At the same time, the provision of the protective cover prevents condensation with the cast-in-place layer 200, which is convenient for dismantling and repeated use.

[0036] In addition, the present application also provides a method for using a PC prefabricated panel joint installation flatness control device, including the method for using the above-mentioned leveling device, comprising the following steps: S1. A mounting hole is reserved at the joint of any two adjacent PC prefabricated panels; semicircular grooves are reserved on both sides of any PC prefabricated panel; and the semicircular grooves between any two adjacent PC prefabricated panels overlap to form a mounting hole.

[0037] S2. The leveling beam is threadedly connected to the first threaded section, and the tightening main pull rod passes through the installation hole from bottom to top; after the bottom installation is completed, the tightening main pull rod passes through the plate seam.

[0038] S3. Put protective sleeves on the two vertical legs and the tightening main pull rod, and the portal frame is threadedly connected to the second threaded section; install the protective sleeves in advance to prevent condensation with the cast-in-place layer.

[0039] S4. Insert and tighten the torsion bar on the first thread segment and the second thread segment, and apply force to pre-tighten; bidirectional adjustment of both ends is achieved, and the adjustment method is more convenient.

[0040] S5. Apply force to rotate the tightening torsion bar of the first threaded section, and position and lock the joint between the two adjacent PC prefabricated panels after it is leveled; and complete the leveling operation based on the fact that the bottom surfaces of the two adjacent PC prefabricated panels are located in the same plane.

[0041] S6. Pour the cast-in-place layer, remove the leveling device after curing for 12 hours, and clean the protective cover for reuse.

[0042] In the present application, by adopting the above method, it is possible to ensure construction quality, improve construction efficiency, and ensure quick and convenient disassembly and assembly, as well as flexible turnover and usability of the leveling device.

[0043] A person of ordinary skill in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. In line with the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present specification as above, which are not provided in detail for the sake of simplicity.

[0044] In addition, to simplify the description and discussion, and in order not to obscure one or more embodiments of the present specification, known power / ground connections of other components may or may not be shown in the provided figures. In addition, devices may be shown in the form of block diagrams to avoid obscuring one or more embodiments of the present specification, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which one or more embodiments of the present specification will be implemented (i.e., these details should be fully within the scope of understanding of those skilled in the art). Where specific details are set forth to describe exemplary embodiments of the present disclosure, it is apparent to those skilled in the art that one or more embodiments of the present specification may be implemented without these specific details or with variations in these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0045] One or more embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this disclosure.

Claims

1. A PC prefabricated board joint installation flatness control device, comprising a leveling device passing along the board seam between any two adjacent PC prefabricated boards; characterized in that: The leveling device comprises: a tightening main pull rod penetrating the plate seam, a bottom leveling component connected to the exposed first end of the tightening main pull rod, and a top flattening component connected to the exposed second end of the tightening main pull rod; wherein, The bottom leveling assembly includes a leveling beam attached between the bottom planes of two adjacent PC prefabricated panels; The top flattening assembly includes a door-shaped frame; the door-shaped frame has two vertical legs that press against the top planes of two adjacent PC prefabricated panels; The exposed first end of the tightening main tie rod has a first threaded section threadedly connected to the leveling beam, and the exposed second end of the tightening main tie rod has a second threaded section threadedly connected to the portal frame body; The first thread segment and the second thread segment are both interspersed with a tightening torsion bar for applying force; When any one of the tightening torsion bars drives the tightening main pull rod to rotate, the leveling beam and the portal frame body move away from or approach each other; The leveling device also includes a plurality of protective covers, which are correspondingly slidably mounted on the two vertical legs and the middle section of the tightening main pull rod, and the bottoms of the plurality of protective covers are all in contact with the top plane of the corresponding PC prefabricated board.

2. The PC prefabricated board joint installation flatness control device according to claim 1, characterized in that: A first nut is connected to the lower surface of the leveling beam, and the first thread section passes through the leveling beam and is threadedly connected to the first nut.

3. The PC prefabricated board joint installation flatness control device according to claim 2, characterized in that: The door-shaped frame includes: the two vertical legs, and a horizontal brace connected between the tops of the two vertical legs; wherein, The upper surface of the cross brace is connected with a second nut, and the second thread segment passes through the cross brace and is threadedly connected with the second nut.

4. The PC prefabricated board joint installation flatness control device according to claim 3, characterized in that: When the first thread segment and the second thread segment are both interspersed with a tightening torsion bar for applying force, A first insertion hole is formed transversely through the first threaded section, and a first tightening torsion rod is plugged and connected in the first insertion hole; A second insertion hole is transversely formed through the second threaded section, and a second tightening torsion rod is plugged and connected in the second insertion hole.

5. The PC prefabricated board joint installation flatness control device according to claim 3, characterized in that: The thread directions of the first thread segment and the second thread segment are opposite.

6. The PC prefabricated board joint installation flatness control device according to claim 5, characterized in that: The first nut is welded and connected to the center point of the leveling beam; The second nut is welded to the center point of the cross brace, and the first nut and the second nut are located at the same center of a circle.

7. The PC prefabricated board joint installation flatness control device according to claim 1, characterized in that: The length of the tightening main pull rod is ≥600mm, and the height of the door-shaped frame is ≥300mm; The lengths of the first thread segment and the second thread segment are both greater than 120 mm.

8. The PC prefabricated board joint installation flatness control device according to claim 1, characterized in that: The multiple protective sleeves are all stainless steel sleeves or PVC sleeves.

9. A method for using a PC prefabricated panel joint installation flatness control device, comprising a method for using the leveling device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Reserve installation holes at the joints of any two adjacent PC prefabricated panels; Step 2: The leveling beam is threadedly connected to the first threaded section, and the main tie rod is tightened to pass through the installation hole from bottom to top; Step 3: Put protective covers on the two vertical legs and the tightening main pull rod, and the door frame body is threadedly connected to the second threaded section; Step 4: insert and tighten the torsion bar through the first thread segment and the second thread segment, and apply force to pre-tighten; Step 5: Apply force to rotate the tightening torsion bar of the first threaded section, and position and lock the joints between the two adjacent PC prefabricated panels after they are leveled; Step 6: Pour the cast-in-place layer and remove the leveling device after curing for 12 hours.

10. The method for using the PC prefabricated panel joint installation flatness control device according to claim 9, characterized in that: Semicircular grooves are reserved on both sides of any PC prefabricated board; The installation hole is formed by overlapping the semicircular grooves between any two adjacent PC prefabricated plates.

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