A prefabricated slab with adjustable rib angle and a construction method thereof

Abstract

The application provides a prefabricated slab with adjustable tendon angle and a construction method thereof, and belongs to the technical field of prefabricated component construction; the prefabricated slab comprises a slab body, an angle adjusting assembly and a movable tendon; a main tendon is arranged in the slab body; the angle adjusting assembly comprises a base and a spherical hinge; the base is pre-buried in the end of the slab body and connected to the main tendon; the spherical hinge is rotationally connected to the base and partially protrudes from the slab body; the movable tendon is arranged in the spherical hinge from the protruding end of the spherical hinge and selectively connected to the base; the movable tendon is used as the anchoring tendon of the prefabricated slab, the spherical hinge is used to drive the movable tendon to rotate, the posture of the movable tendon can be adjusted according to the requirement, the movable tendon is adapted to different working conditions, the convenience and safety of the prefabricated slab installation are improved, and the construction efficiency is improved; meanwhile, the movable tendon can be fixed to ensure the accurate position of the movable tendon.

Description

Technical Field

[0001] This invention belongs to the field of precast component construction technology, and in particular relates to a precast slab with adjustable reinforcement angle and its construction method. Background Technology

[0002] Precast slabs typically have exposed reinforcing bars at their ends for connection to the beam's reinforcing cage. Because these exposed bars are parallel to the slab surface, they are prone to snagging with adjacent components (beams, columns) during hoisting and installation, resulting in slow hoisting speeds and significant safety hazards. While bending the exposed bars on-site can mitigate these risks, this method is labor-intensive and carries a high risk of worker injury. Furthermore, manual straightening of the bent bars is difficult to control, leading to positional deviations and inaccurate insertion into the beam's reinforcing cage. Repeated adjustments or prying can damage the bond between the bars, causing severe deformation of the beam's stirrups and affecting the beam's load-bearing capacity. It can also cause insufficient anchorage length or large deviations in the protective layer thickness, becoming a source of crack development and impacting overall structural safety. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a precast slab with adjustable reinforcement angle and its construction method, which improves the convenience and safety of precast slab installation and increases construction efficiency.

[0004] The technical solution adopted in this invention is: a precast slab with adjustable reinforcing bar angle, comprising a slab body, an angle adjustment component, and movable reinforcing bars; the slab body is provided with main reinforcing bars, the angle adjustment component includes a base and a ball joint, the base is pre-embedded at the end of the slab body and connected to the main reinforcing bars; the ball joint is rotatably connected to the base and partially protrudes from the slab body; the movable reinforcing bars pass through the ball joint from the protruding end of the ball joint and can be selectively connected to the base.

[0005] Furthermore, the base is provided with a first threaded hole, and the main rib is threadedly connected to the first threaded hole.

[0006] Furthermore, the base is also provided with a spherical groove with an opening, the spherical hinge is embedded in the spherical groove, and the movable steel bar passes through the opening into the spherical hinge; the opening can accommodate the movable steel bar to rotate at least 90 degrees.

[0007] Furthermore, the ball joint is provided with a limiting protrusion extending circumferentially thereon, and the limiting protrusion has a slide rail; the spherical groove is provided with a limiting groove, and the limiting groove is provided with an elastic element and a limiting ball, the limiting ball is connected to the elastic element and slidably connected with the slide rail; the limiting slide rail is provided with a plurality of positioning grooves adapted to the limiting ball.

[0008] Furthermore, the rotation axis of the slide is parallel to the surface of the plate, and the length of the arc-shaped center line of the slide is not less than one-quarter of the circumference of the ball joint.

[0009] Furthermore, the ball joint is provided with a second threaded hole, and the movable reinforcing bar is threadedly connected to the second threaded hole.

[0010] Furthermore, the axis of the second threaded hole passes through the center of the ball joint and is collinear with the center line of the first threaded hole; the movable reinforcing bar is selectively threaded into the first threaded hole.

[0011] Furthermore, the first threaded hole includes a first hole segment and a second hole segment, and the main reinforcing bar is threadedly connected to the first hole segment; the movable reinforcing bar is threadedly connected to the second threaded hole in the first working condition, and is threadedly connected to the second threaded hole and the second hole segment in the second working condition, and abuts against the main reinforcing bar.

[0012] Furthermore, the base is also provided with a third threaded hole, which is vertically connected to the second hole section and extends through to the plate surface; a limit pin is internally threaded into the third threaded hole; one end of the movable reinforcing bar is provided with a limit ring groove that matches the limit pin.

[0013] The construction method for the precast slab with adjustable reinforcement angle, as described above, includes the following steps:

[0014] Connect the main reinforcement bars and the base, and connect multiple main reinforcement bars to form a steel mesh;

[0015] Cast the slab and install the ball joint on the base;

[0016] Install the movable reinforcing bar onto the ball joint, and rotate the ball joint so that the movable reinforcing bar is perpendicular to the surface of the plate.

[0017] The precast slab is hoisted to the set position, the ball joint is rotated until the movable steel bar is in a horizontal position, the movable steel bar is screwed into the first threaded hole, and locked by the limit pin.

[0018] The advantages and positive effects of this invention are:

[0019] (1) This application sets an angle adjustment component at the end of the slab body, which is connected with the main reinforcement and movable reinforcement to form an integral structure. The movable reinforcement can be connected to the base as needed, or not connected to the base. When it is not connected to the base, the movable reinforcement can be rotated by a ball joint to adjust the posture of the movable reinforcement. By adjusting the posture of the movable reinforcement, it is possible to avoid the movable reinforcement from being hooked and damaged by adjacent components during the hoisting of the precast slab, thereby improving the convenience and safety of the hoisting of the precast slab. When the precast slab is connected to the beam, the movable reinforcement can be adjusted to another posture and fixed by the base to ensure the accurate position of the movable reinforcement, so as to smoothly insert it into the set position of the beam and more conveniently realize the assembly connection between the precast slab and the beam. Compared with the prior art, the bending and straightening of the main reinforcement is eliminated, which can greatly reduce the workload of workers and improve the assembly construction efficiency of the precast slab.

[0020] (2) Using the movable steel bars as anchoring steel bars for the precast slab, the main steel bars and movable steel bars do not need to be bent throughout the process, which ensures the original mechanical properties of the main steel bars and movable steel bars. This is conducive to ensuring the anchoring performance of the connection structure between the precast slab and the beam, and can effectively avoid the decrease in the bearing capacity of the node due to the deformation of the steel bars, and will not cause the risk of cracking.

[0021] (3) By setting a ball joint, the rotation of the ball joint allows the movable steel bar to switch between horizontal and vertical positions, thus ensuring the installation accuracy of the movable steel bar;

[0022] (4) By connecting the movable steel bar to the first threaded hole and locking it with a limit pin, the stability of the movable steel bar is ensured and the exposed length of the movable steel bar can be precisely controlled.

[0023] (5) The overall structure is simple, easy to manufacture, convenient to use, and highly applicable. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the angle adjustment component structure according to a specific embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional schematic diagram of an angle adjustment component according to a specific embodiment of the present invention;

[0027] Figure 4 This is an exploded view of an angle adjustment component according to a specific embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the connection between the slide and the limiting ball in a specific embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the position of the movable reinforcing bar under the first working condition of a specific embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the position of the movable reinforcing bar under the second working condition of a specific embodiment of the present invention;

[0031] In the picture:

[0032] 1. Plate; 2. Main reinforcement; 3. Base; 31. First connecting part; 32. Second connecting part; 33. Third connecting part; 4. Limiting pin; 5. Third threaded hole; 6. Ball joint; 7. Limiting ball; 8. Slide; 9. Movable reinforcement; 10. Second threaded hole; 11. First threaded hole; 12. Limiting ring groove. Detailed Implementation

[0033] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0034] like Figures 1 to 4 As shown, this embodiment of the invention proposes a precast slab with adjustable reinforcing bar angle, including a slab body 1, an angle adjustment assembly, and movable reinforcing bars 9; the slab body 1 is provided with main reinforcing bars 2, the angle adjustment assembly includes a base 3 and a ball joint 6, the base 3 is pre-embedded at the end of the slab body 1 and connected to the main reinforcing bars 2; the ball joint 6 is rotatably connected to the base 3 and partially protrudes from the slab body 1; the movable reinforcing bars 9 pass through the ball joint 6 from the protruding end of the ball joint 6 and can be selectively connected to the base 3.

[0035] The precast slab is a slab-shaped reinforced concrete component prefabricated in a factory and assembled and connected to the cast-in-place beam at the construction site. The main reinforcement 2 includes transverse main reinforcement 2 and longitudinal main reinforcement 2 arranged in a crisscross pattern and set parallel to the surface of the precast slab. In the prior art, the main reinforcement 2 protrudes from the slab 1 by a set length, needs to be bent during hoisting, and then corrected after hoisting and positioning. It is then inserted into the beam and embedded in the beam as the concrete is poured, forming anchor reinforcement to achieve the assembly connection between the precast slab and the beam.

[0036] This application incorporates an angle adjustment component at the end of the slab 1. This component, along with the main reinforcement 2 and the movable reinforcement 9, forms an integral structure. The movable reinforcement 9 can be connected to the base 3 or not, as needed. When not connected, the movable reinforcement 9 can be rotated using a ball joint 6 to adjust its posture for different construction conditions. Specifically, by adjusting the posture of the movable reinforcement 9, damage from snagging on adjacent components (beams, columns) can be avoided during the hoisting of the precast slab. Furthermore, when the precast slab is joined to the beam, the movable reinforcement 9 can be adjusted to another posture and fixed by the base 3, ensuring precise positioning for easy insertion into the beam's designated position. This facilitates easier assembly and connection between the precast slab and the beam. Compared to existing technologies, this eliminates the need for bending and straightening the main reinforcement 2, significantly reducing worker workload and improving the efficiency of precast slab assembly.

[0037] Meanwhile, the entire process does not require bending of the main reinforcement 2 and the movable reinforcement 9, ensuring the original mechanical properties of the main reinforcement 2 and the movable reinforcement 9. This is beneficial to ensuring the anchorage performance of the connection structure between the precast slab and the beam, effectively avoiding the decrease in the load-bearing capacity of the joint due to the deformation of the reinforcement, and preventing the risk of cracking.

[0038] Furthermore, in this embodiment, the base 3 is provided with a first threaded hole 11, and the main rib 2 is threadedly connected to the first threaded hole 11. The connection operation is simple, the stability is high, and the positioning of the base 3 can be ensured accurately.

[0039] Specifically, such as Figures 2 to 4 As shown, the base 3 includes a first connecting part 31, which is tubular and has a first threaded hole 11 inside. Before the precast concrete is poured, the first connecting part 31 is threaded to the end of the main reinforcement 2, so that the base 3 and the main reinforcement 2 can be firmly connected. The threaded connection method is not only easy to operate and reliable, but also facilitates the adjustment of the insertion length of the main reinforcement 2, so that the base 3 is located at the set position at the end of the slab 1, ensuring its accurate positioning. After the precast concrete is poured, both the main reinforcement 2 and the base 3 can be firmly fixed in the slab 1.

[0040] In the above embodiments, the outer contour of the first connecting portion 31 can be square, rectangular, or circular, and there is no limitation thereto. Preferably, the outer contour of the first connecting portion 31 is square.

[0041] Furthermore, in this embodiment, the base 3 is also provided with a spherical groove with an opening. A spherical hinge 6 is embedded in the spherical groove, and a movable reinforcing bar 9 passes through the opening into the spherical hinge 6. The opening can accommodate the movable reinforcing bar 9 to rotate at least 90 degrees. The spherical hinge 6 can rotate within the spherical groove, thereby driving the movable reinforcing bar 9 to rotate. The angle of the movable reinforcing bar 9 is at least 90 degrees, and it can change from being parallel to the surface of the precast slab to being perpendicular to the surface of the precast slab. When the movable reinforcing bar 9 is parallel to the surface of the precast slab, it can be inserted into the inside of the stirrups of the beam when docking with the beam. When the movable reinforcing bar 9 is perpendicular to the surface of the precast slab, it is easier to hoist the precast slab and avoid the movable reinforcing bar 9 from hooking onto surrounding structures or components.

[0042] Specifically, the inner wall of the aforementioned spherical groove is larger than half the spherical surface of the ball joint 6, which can prevent the ball joint 6 from coming out of the spherical groove, while also exposing a portion of the ball joint 6 at the opening, so that the movable reinforcing bar 9 can be inserted.

[0043] In one specific embodiment, the base 3 includes a second connecting part 32, one end of which is connected to the first connecting part 31, and the other end is provided with a spherical groove; at least a portion of the second connecting part 32 is embedded in the plate 1, and the outer contour of its cross section can be square or circular, which is not limited here.

[0044] Preferably, the cross-sectional outer contour of the second connecting part 32 is square, and the end face on the side where the opening of the spherical groove is located includes an inclined surface and a straight surface. The straight surface is flush with the end face of the plate 1 to facilitate accurate positioning of the pre-embedded position of the base 3. The inclined surface is inclined outward from the straight surface and protrudes from the end face of the plate 1. The opening of the spherical groove is located on the inclined surface. The ball joint 6 protrudes partially from the inclined surface.

[0045] In a preferred embodiment, the second connecting part 32 includes a first seat and a second seat, which can be connected by bolts to form a spherical groove. When installing the ball hinge 6, the ball hinge 6 can be installed on the first seat first, and then the second seat can be fastened and locked by bolts to fix the ball hinge 6 in the spherical groove.

[0046] Furthermore, in the embodiments of this application, such as Figure 3 and Figure 5 As shown, the ball joint 6 has a limiting protrusion extending along its direction, and the limiting protrusion has a slide rail 8; a limiting groove is provided in the spherical groove, and an elastic element and a limiting ball 7 are provided in the limiting groove. The limiting ball 7 is connected to the elastic element and is slidably connected to the slide rail 8; the limiting slide rail 8 has multiple positioning grooves that are adapted to the limiting ball 7. The limiting cooperation between the slide rail 8 and the limiting ball 7 can limit the rotation direction and rotation angle of the ball joint 6.

[0047] Specifically, when the elastic element is in a compressed state, the ball joint 6 can be rotated by external force to make the limiting ball 7 further press against the elastic element, so that the limiting ball 7 can slide within the sliding area. When the ball joint 6 needs to be locked, the limiting ball 7 can press against the positioning groove under the compression of the elastic element, thereby restricting the rotation of the ball joint 6.

[0048] Furthermore, in this embodiment, the rotation axis of the slide rail 8 is parallel to the surface of the plate 1, and the length of the arc-shaped center line of the slide rail 8 is not less than one-quarter of the circumference of the ball joint 6. The rotation axis of the slide rail 8 can control the rotation axis of the ball joint 6, thereby controlling the rotation direction of the movable reinforcing bar 9; by setting the length of the arc-shaped center line of the slide rail, the rotation angle of the movable reinforcing bar 9 can be limited. Through the above-mentioned settings, this embodiment ensures that the movable reinforcing bar 9 is parallel to the surface of the plate 1 when the slide rail 8 rotates to a set position, and perpendicular to the plate 1 when the slide rail 8 rotates to another set position, thus adapting to hoisting and docking conditions.

[0049] It is understandable that the slab 1 is in a horizontal position regardless of whether it is being hoisted or being connected. When the movable reinforcing bar 9 is perpendicular to the surface of the precast slab, the movable reinforcing bar 9 is set vertically, which is suitable for hoisting. When the movable reinforcing bar 9 is parallel to the surface of the precast slab, the movable reinforcing bar 9 extends horizontally, which is suitable for connecting with the beam.

[0050] Preferably, the straight surface is located on one side near the upper surface of the slab 1, and the inclined surface slopes upward from the straight surface. The slide rail 8 is located on one side near the upper surface of the slab 1. During hoisting, the movable reinforcing bar 9 can be rotated to fit against the vertical surface or protrude from the lower surface of the slab 1 to minimize the overall area of ​​the precast slab and to protect the movable reinforcing bar 9 while avoiding hooking.

[0051] In one specific embodiment, the limiting groove is located on the side near the inclined surface. The end of the chute near the junction of the movable reinforcing bar 9 and the ball joint 6 is the starting end. The chute extends along the ball joint 6 towards the first connecting part 31, and the end near the first connecting part 31 is the ending end. When the movable reinforcing bar 9 is parallel to the plate surface of the plate body 1, the limiting ball 7 can be just embedded in the first positioning groove at the starting end. When the limiting ball 7 is embedded in the last positioning groove at the ending end, the movable reinforcing bar 9 can rotate downward by 90 degrees or more.

[0052] Furthermore, in this embodiment, the ball joint 6 has a second threaded hole 10, and the movable steel bar 9 is threadedly connected to the second threaded hole 10, which can conveniently achieve a stable connection between the movable steel bar 9 and the ball joint 6.

[0053] Furthermore, in this embodiment, the axis of the second threaded hole 10 passes through the center of the ball joint 6 and is collinear with the center line of the first threaded hole 11. The movable reinforcing bar 9 is selectively threaded into the first threaded hole 11. With this arrangement, after the precast slab is hoisted into place, the movable reinforcing bar 9 passes through the second threaded hole 10 into the first threaded hole 11, thereby fixing it in both the first and second threaded holes 11. By locking the movable reinforcing bar 9 and the ball joint 6 using the first threaded hole 11, rotation of the movable reinforcing bar 9 or the ball joint 6 can be effectively prevented, thereby fixing the movable reinforcing bar 9 in a horizontal position and ensuring the accurate positioning of the movable reinforcing bar 9.

[0054] Specifically, the first threaded hole 11 includes a first hole section and a second hole section, with the main reinforcing bar 2 threadedly connected to the first hole section; the movable reinforcing bar 9 is threadedly connected to the second threaded hole 10 in the first working condition, and threadedly connected to the second threaded hole 10 and the second hole section in the second working condition, abutting against the main reinforcing bar 2. The first working condition corresponds to the hoisting working condition, and the second working condition corresponds to the docking working condition; as... Figure 6 and Figure 7 As shown, during hoisting, the ball joint 6 can be used to rotate the movable reinforcing bar 9 to a vertical position, effectively preventing snagging and improving the convenience and safety of hoisting operations. When aligning with the beam, the second hole section can be used to fix the movable reinforcing bar 9, ensuring its alignment with the main reinforcing bar 2 and guaranteeing the accuracy of its position. The cooperation of the first threaded hole 11 and the second threaded hole 10 enables rapid switching of the movable reinforcing bar 9's posture, while maintaining high connection stability and ease of operation.

[0055] Furthermore, in this embodiment, the base 3 is also provided with a third threaded hole 5, which is vertically connected to the second hole section and extends through to the plate surface; a limiting pin 4 is internally threaded into the third threaded hole 5; one end of the movable reinforcing bar 9 is provided with a limiting ring groove 12 that is adapted to the limiting pin 4. The limiting pin 4 can extend into the limiting ring groove 12 to limit the outward movement of the movable reinforcing bar 9, which can effectively prevent the movable reinforcing bar 9 from moving outward and ensure that the internal length and exposed length of the movable reinforcing bar 9 meet the requirements; the limiting pin 4 locks the movable reinforcing bar 9 before entering the docking condition.

[0056] In the above embodiment, the base 3 also includes a third connecting part 33, and a third threaded hole 5 is formed in the third connecting part 33. The third connecting part 33 is arranged along the thickness direction of the plate 1, and preferably extends through to the upper plate surface of the plate 1, so as to facilitate the operator to perform a screwing and locking operation.

[0057] This invention also proposes a construction method for the precast slab with adjustable reinforcement angle, comprising the following steps:

[0058] S1. Connect the main reinforcement 2 and the base 3, and connect multiple main reinforcement 2 to form a steel mesh;

[0059] Based on the dimensional parameters of the precast slab, the installation position of the base 3 is preset, and the length of the main reinforcement 2 and the length of the threaded section are determined;

[0060] The two ends of the main rib 2 are threaded to the first threaded hole 11 of the base 3. When connecting, the connection length between the main rib 2 and the first threaded hole 11 is controlled to meet the length requirements. Specifically, the connection length between the two can be controlled by controlling the number of threads of the main rib 2 exposed in the first threaded hole 11.

[0061] Connect the limiting pin 4 to the third threaded hole 5 to control the depth of the limiting pin 4 and prevent the limiting pin 4 from extending into the first threaded hole 11.

[0062] Based on the design reinforcement spacing and protective layer thickness of the precast slab, the horizontal spacing of the main reinforcement 2 is determined, and the limiting pin 4 is made to be vertically upward, connecting multiple main reinforcement 2 to form a steel mesh.

[0063] S2. Cast slab 1 and install ball joint 6 on base 3;

[0064] In this embodiment of the application, when the concrete of the slab 1 is poured and reaches 75% of the design strength, the ball hinge 6 is installed into the base 3, and the rotation angle and rotation flexibility of the ball hinge 6 are checked, and then it is transported to the construction site.

[0065] S3. Install the movable reinforcing bar 9 onto the ball joint 6, and rotate the ball joint 6 so that the movable reinforcing bar 9 is perpendicular to the surface of the plate 1;

[0066] In this embodiment of the application, after the concrete strength of the precast slab reaches 100%, the second threaded hole 10 is in a horizontal state when the ball hinge 6 is rotated. Then, the movable steel bar 9 is screwed into the second threaded hole 10, and the ball hinge 6 is rotated. The free end of the movable steel bar 9 rotates downward to 90°, thus completing the pre-hoisting preparation work.

[0067] S4. Hoist the precast slab to the set position, rotate the ball hinge 6 until the movable steel bar 9 is in a horizontal position, screw the movable steel bar 9 into the first threaded hole 11, and lock it with the limit pin 4.

[0068] Before hoisting, the joint positions of the precast slab and the beam are marked out according to the design drawings. Then the precast slab is hoisted. When it is hoisted to a design height of 300-500mm from the slab surface, the position of the beam reinforcement is observed to avoid collision. The precast slab is slowly lowered and the installation position is checked.

[0069] After verifying that everything is correct, rotate the ball joint 6 to rotate the free end of the movable steel bar 9 upward to a horizontal position, and continue to screw the movable steel bar 9 until it extends into the first threaded hole 11 and abuts against the main steel bar 2; and continue to screw the limiting pin 4 into it until it abuts against the limiting ring groove 12 to complete the double locking.

[0070] At this point, the free end of the movable reinforcing bar 9 extends into the inner side of the beam stirrups for a set length, and then the beam concrete can be poured. Finally, the reinforcing bar installation and concrete pouring work of the upper cast-in-place layer of the precast slab are carried out.

[0071] In this embodiment, by adopting the structure and construction method of the precast slab described above, the installation time of a single precast slab is reduced by 50% compared to the installation time required by using traditional precast slabs; the damage rate of the anchoring steel bars of the precast slab will be reduced to 0.

[0072] The advantages and positive effects of this invention are:

[0073] (1) This application provides an angle adjustment component at the end of the slab, which is connected to the main reinforcement and movable reinforcement to form an integral structure. The movable reinforcement can be connected to the base as needed, or not connected to the base. When it is not connected to the base, the movable reinforcement can be rotated by a ball joint to adjust its posture. By adjusting the posture of the movable reinforcement, it is possible to avoid the movable reinforcement from getting caught on adjacent components (beams, columns) and being damaged during the hoisting of the precast slab, thus improving the convenience and safety of the hoisting of the precast slab. Furthermore, when the precast slab is connected to the beam, the movable reinforcement can be adjusted to another posture and fixed by the base to ensure the accurate position of the movable reinforcement, so as to facilitate its insertion into the set position of the beam and more conveniently realize the assembly connection between the precast slab and the beam. Compared with the prior art, the bending and straightening of the main reinforcement is eliminated, which can greatly reduce the workload of workers and improve the assembly and construction efficiency of the precast slab.

[0074] (2) Using the movable steel bars as anchoring steel bars for the precast slab, the main steel bars and movable steel bars do not need to be bent throughout the process, which ensures the original mechanical properties of the main steel bars and movable steel bars. This is conducive to ensuring the anchoring performance of the connection structure between the precast slab and the beam, and can effectively avoid the decrease in the bearing capacity of the node due to the deformation of the steel bars, and will not cause the risk of cracking.

[0075] (3) By setting a ball joint, the rotation of the ball joint allows the movable steel bar to switch between horizontal and vertical positions, thus ensuring the installation accuracy of the movable steel bar;

[0076] (4) By connecting the movable steel bar to the first threaded hole and locking it with a limit pin, the stability of the movable steel bar is ensured and the exposed length of the movable steel bar can be precisely controlled.

[0077] (5) The overall structure is simple, easy to manufacture, convenient to use, and highly applicable.

[0078] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A precast slab with adjustable rib angle, characterized in that: The device includes a plate, an angle adjustment assembly, and movable reinforcing bars. The plate contains main reinforcing bars. The angle adjustment assembly includes a base and a ball joint. The base is embedded in the end of the plate and connected to the main reinforcing bars. The ball joint is rotatably connected to the base and partially protrudes from the plate. The movable reinforcing bars pass through the ball joint from its protruding end and can be selectively connected to the base.

2. The precast slab with adjustable reinforcing bar angle according to claim 1, characterized in that: The base is provided with a first threaded hole, and the main rib is threadedly connected to the first threaded hole.

3. The precast slab with adjustable reinforcing bar angle according to claim 2, characterized in that: The base is also provided with a spherical groove with an opening. The spherical hinge is embedded in the spherical groove, and the movable steel bar passes through the opening into the spherical hinge. The opening can accommodate the movable steel bar to rotate at least 90 degrees.

4. The precast slab with adjustable reinforcing bar angle according to claim 3, characterized in that: The ball joint is provided with a limiting protrusion extending circumferentially thereon, and the limiting protrusion has a slide rail; the spherical groove is provided with a limiting groove, and the limiting groove is provided with an elastic element and a limiting ball, the limiting ball is connected to the elastic element and is slidably connected with the slide rail; the limiting slide rail is provided with a plurality of positioning grooves that are adapted to the limiting ball.

5. The precast slab with adjustable reinforcing bar angle according to claim 4, characterized in that: The axis of rotation of the slide is parallel to the surface of the plate, and the length of the arc-shaped center line of the slide is not less than one-quarter of the circumference of the ball joint.

6. The precast slab with adjustable reinforcing bar angle according to any one of claims 2-4, characterized in that: The ball joint has a second threaded hole, and the movable steel bar is threadedly connected to the second threaded hole.

7. The precast slab with adjustable reinforcing bar angle according to claim 6, characterized in that: The axis of the second threaded hole passes through the center of the ball joint and is collinear with the center line of the first threaded hole; the movable reinforcing bar is selectively threaded into the first threaded hole.

8. The precast slab with adjustable reinforcing bar angle according to claim 7, characterized in that: The first threaded hole includes a first hole section and a second hole section, and the main reinforcing bar is threadedly connected to the first hole section; the movable reinforcing bar is threadedly connected to the second threaded hole in the first working condition, and is threadedly connected to the second threaded hole and the second hole section in the second working condition, and abuts against the main reinforcing bar.

9. The precast slab with adjustable reinforcing bar angle according to claim 8, characterized in that: The base is also provided with a third threaded hole, which is vertically connected to the second hole section and extends through to the surface of the plate; a limit pin is internally threaded into the third threaded hole; one end of the movable reinforcing bar is provided with a limit ring groove that is adapted to the limit pin.

10. The construction method of the precast slab with adjustable reinforcement angle as described in any one of claims 1-9, characterized in that, Includes the following steps: Connect the main reinforcement bars and the base, and connect multiple main reinforcement bars to form a steel mesh; Cast the slab and install the ball joint on the base; Install the movable reinforcing bar onto the ball joint, and rotate the ball joint so that the movable reinforcing bar is perpendicular to the surface of the plate. The precast slab is hoisted to the set position, the ball joint is rotated until the movable steel bar is in a horizontal position, the movable steel bar is screwed into the first threaded hole, and locked by the limit pin.

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