Steel strand lifting ring protection device suitable for prefabricated part and preparation method of steel strand lifting ring protection device

Abstract

The invention relates to the technical field of building construction, and discloses a steel strand lifting ring protection device suitable for a prefabricated part and a preparation method thereof.The steel strand lifting ring protection device suitable for the prefabricated part comprises a mold assembly and a pouring layer, and a first prefabricated mold and a second prefabricated mold are detachably arranged in a part base body; and after the pouring layer is cured, the first prefabricated mold and the second prefabricated mold are demolded. When the hoisting device pulls the prefabricated part, the two ends of the connecting part of the steel strand hoisting ring can be attached to the surfaces, at the first forming notch and the second forming notch, of the pouring layer correspondingly, the contact area between the steel strand hoisting ring and the prefabricated part is increased, and the fracture risk of the steel strand hoisting ring is reduced. The invention further provides a preparation method of the steel strand lifting ring protection device suitable for the prefabricated part, the first forming notch and the second forming notch in the prefabricated part are manufactured through the first prefabricated mold and the second prefabricated mold, the repeated utilization rate of the mold assembly is increased, and the construction difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a steel strand lifting ring protection device suitable for prefabricated components and a preparation method thereof. Background Art

[0002] During construction, various building components and equipment need to be lifted to designated locations for installation. Traditional hoisting operations often face issues such as insufficient connection stability and limited positioning accuracy. Some related technologies use pre-buried steel strand hangers as quick connection points for hoisting operations. These hangers offer advantages such as high tensile strength and excellent elasticity, meeting the requirements of high-precision hoisting operations.

[0003] When using steel strand hangers to raise vertical prefabricated components from a horizontal position to a vertical position for installation, the embedded steel strand hangers are subjected to dynamic variable loads. Under the action of shear forces, stress concentrations can easily occur at the interface between the steel strand hangers and the concrete component, leading to shear damage to the steel strands. Furthermore, during lifting, the interface between the steel strand hangers and the concrete is prone to damage due to localized pressure. If the concrete strength grade of the component is low, cracks may form around the steel strand hangers, affecting the safety of the lifting operation.

[0004] Therefore, there is an urgent need to improve the existing vertical prefabricated components to avoid the risk of breakage of the embedded steel strand hangers during the lifting operation and solve the problem of component damage due to local pressure. Summary of the Invention

[0005] Based on the above problems, the purpose of the present invention is to provide a method for preparing a steel strand lifting ring protection device suitable for prefabricated components and a method for preparing the same, which can enhance the safety of the lifting operation and reduce the risk of damage during lifting.

[0006] To achieve the above objectives, the following technical solutions are provided:

[0007] In a first aspect, the present invention provides a steel strand eye protection device suitable for use in prefabricated components, comprising:

[0008] A mold assembly can be detachably mounted on a component base, comprising a first prefabricated mold and a second prefabricated mold, wherein the first prefabricated mold can be demoulded from the component base to form a first molding notch on the component base; and the second prefabricated mold can be demoulded from the component base to form a second molding notch on the component base.

[0009] The casting layer is filled in the casting space surrounded by the component base and the mold assembly. When the casting layer is configured so that the lifting device lifts the component base, the surfaces of the casting layer at the first forming notch and the second forming notch can respectively abut against the two ends of the connection part of the steel wire rope eye.

[0010] Optionally, the first prefabricated mold is provided with a guide surface, and along the axial direction of the first anchoring portion of the steel strand eye, the distance between the guide surface and the first anchoring portion gradually increases.

[0011] Optionally, the first prefabricated mold includes a first splicing portion and a second splicing portion that are detachably connected, and the first splicing portion and the second splicing portion can be installed on opposite sides of the first anchoring portion of the steel strand eye.

[0012] Optionally, the mold assembly further includes an enclosure member, which can be detachably enclosed on a preset surface of the component base, and the first prefabricated mold and the second prefabricated mold are both detachably connected to the enclosure member.

[0013] Specifically, the first prefabricated mold is provided with a first connecting protrusion, and the second prefabricated mold is provided with a second connecting protrusion. Both the first connecting protrusion and the second connecting protrusion are plug-fitted with the enclosure member.

[0014] Furthermore, the steel strand eye protection device suitable for prefabricated components also includes a locking piece, the first connecting protrusion at least partially passes through the enclosure, and the locking piece and the first connecting protrusion are threadedly matched and can be pressed against the enclosure.

[0015] Optionally, the steel strand eye protection device suitable for prefabricated components also includes a rigid reinforcement component that can be anchored in the component base, the rigid reinforcement component includes embedded reinforcement and a first rigid reinforcement member and a second rigid reinforcement member both fixedly connected to the embedded reinforcement, the first rigid reinforcement member is connected to the first anchoring portion of the steel strand eye, and the second rigid reinforcement member is connected to the second anchoring portion of the steel strand eye.

[0016] Specifically, the first rigid reinforcement can be mounted on the first anchoring portion and detachably connected to the first precast mold, the second rigid reinforcement can be mounted on the second anchoring portion and detachably connected to the second precast mold, and the first rigid reinforcement and the second rigid reinforcement are respectively affixed to the surface of the casting layer at the first molding notch and the second molding notch.

[0017] In a second aspect, the present invention further provides a method for preparing a steel strand lifting eye protection device suitable for prefabricated components, which is used to prepare the above-mentioned steel strand lifting eye protection device suitable for prefabricated components, comprising the following steps:

[0018] S1, installing the first prefabricated mold and the second prefabricated mold into the component base;

[0019] S2. Insert the first anchoring portion and the second anchoring portion of the steel strand eyelet into the component matrix;

[0020] S3. Filling and setting a casting layer in the casting space surrounded by the component base and the mold assembly;

[0021] S4. After the casting layer is solidified, the mold assembly is removed.

[0022] Optionally, step S4 includes the following steps:

[0023] S41, demoulding the first prefabricated mold and the second prefabricated mold from the component base, so that the component base is formed with a first molding notch and a second molding notch;

[0024] S42, polishing and grinding the surfaces of the casting layer at the first molding notch and the second molding notch.

[0025] The beneficial effects of the present invention are:

[0026] The present invention proposes a steel strand eye protection device suitable for prefabricated components, wherein a first prefabricated mold and a second prefabricated mold are detachably provided in a component base. After casting is completed, the first prefabricated mold and the second prefabricated mold are demoulded from the component base. At this time, a first forming notch and a second forming notch are formed in the component base accordingly. When the lifting device lifts the component base from a horizontal position to a vertical position to be installed, the two ends of the connection portion of the steel strand eye can respectively rest on the surface of the casting layer at the first forming notch and the second forming notch. By forming the first forming notch and the second forming notch in the component base through the mold assembly, the contact area between the steel strand eye and the component base can be increased when the component base is lifted, the stress concentration phenomenon generated at the connection between the connection portion and the component base can be reduced, the risk of fracture of the steel strand eye can be reduced, and the safety of the component base lifting operation can be improved. At the same time, the risk of damage at the connection portion between the component base and the steel strand eye during lifting can be reduced, thereby improving the structural integrity of the steel strand eye protection device suitable for prefabricated components. The first molding notch and the second molding notch are formed by the mold assembly, and have standardized sizes and controllable shapes.

[0027] The present invention also proposes a method for preparing a steel strand lifting ring protection device suitable for prefabricated components. When the lifting device does not lift the component base, the first prefabricated mold and the second prefabricated mold are placed in the component base, and then a casting layer is filled in the casting space surrounded by the component base and the mold assembly. After the casting layer is solidified, the mold assembly is demolded from the component base to form a first forming notch and a second forming notch in the component base. When the lifting device pulls the steel strand lifting ring, the two ends of the connecting part of the steel strand lifting ring can respectively abut against the surface of the casting layer at the first forming notch and the second forming notch, reducing the hidden danger of stress concentration. The first forming notch and the second forming notch in the component base are made by the first prefabricated mold and the second prefabricated mold, which improves the reuse rate of the mold assembly and reduces the difficulty of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0029] Figure 1 It is a structural diagram of a concrete component in a horizontally placed state in the related art;

[0030] Figure 2 It is a structural diagram of a concrete component during the lifting operation in the related art;

[0031] Figure 3 yes Figure 2 Enlarged view of part A;

[0032] Figure 4 Schematic diagram of the structure of a steel strand lifting ring protection device applicable to prefabricated components provided by a specific embodiment of the present invention, which does not include a rigid reinforcement component;

[0033] Figure 5 This is a partial structural diagram of a steel strand lifting ring protection device applicable to prefabricated components provided by a specific embodiment of the present invention, which does not include a rigid reinforcement component;

[0034] Figure 6 It is a structural schematic diagram of a steel strand lifting eye protection device applicable to prefabricated components during lifting provided by a specific embodiment of the present invention;

[0035] Figure 7 yes Figure 6 Enlarged view of part B;

[0036] Figure 8 1 is a schematic structural diagram of a steel strand lifting ring protection device for prefabricated components including a rigid reinforcement assembly provided by a specific embodiment of the present invention;

[0037] Figure 9 It is a partial structural schematic diagram of a steel strand lifting ring protection device applicable to prefabricated components, including a rigid reinforcement assembly, provided by a specific embodiment of the present invention;

[0038] In the picture:

[0039] 100, concrete components; 200, steel strand hangers;

[0040] 1. Component base; 11. First molding notch; 12. Second molding notch;

[0041] 2. Mold assembly; 21. First prefabricated mold; 211. First splicing portion; 212. Second splicing portion;

[0042] 213, guide surface; 214, first connecting protrusion; 22, second prefabricated mold; 221, second connecting protrusion; 23, enclosure;

[0043] 3. Casting layer;

[0044] 4. Steel strand eye; 41. First anchoring portion; 42. Connecting portion; 43. Second anchoring portion;

[0045] 5. Rigid reinforcement assembly; 51. Embedded reinforcement; 52. First rigid reinforcement member; 53. Second rigid reinforcement member. DETAILED DESCRIPTION

[0046] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first rigid reinforcement" and "second rigid reinforcement" refer to rigid reinforcements at two different locations.

[0048] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0049] During the construction process, various building components or equipment need to be lifted to the designated location for installation. Traditional hoisting operations often face problems such as insufficient connection stability or limited positioning accuracy. In some related engineering operations, pre-buried steel strand hangers 200 are used as quick connection points for hoisting operations. They have the advantages of high tensile strength and excellent elasticity. Figure 1-Figure 3 As shown in the figure, when the concrete component 100 is lifted from the horizontal position to the vertical installation position, there are the following main problems: (1) During the initial lifting stage, the steel strand hanger 200 is subjected to dynamic variable loads, mainly shear force, which is easy to cause the steel strand hanger 200 to break at the interface between the steel strand hanger 200 and the concrete component 100 ( Figure 3 (1) The stress concentration phenomenon occurs at the arrow point, and there is a risk of shear damage to the steel strand hanger 200; (2) During the lifting process, the interface between the steel strand hanger 200 and the concrete component 100 is prone to local compressive damage. When the compressive strength grade of the concrete component 100 is lower than C30, the crack incidence rate around the steel strand hanger 200 reaches 15% to 20%, seriously affecting the safety of the lifting operation; (3) According to the lifting point design clause in the "JTG3365-05-2022 Highway Prefabricated Concrete Bridge Design Code", "Only When the strand is suspended vertically, the tensile stress in the strand should not exceed 350 MPa. When the strand is subjected to a reversal condition, the tensile stress in the strand should not exceed 280 MPa if the reversal frequency does not exceed three. If the reversal frequency exceeds three, the allowable stress in the hoist ring should be determined through on-site testing under the same operating conditions, with a safety factor of no less than 3. Because reversal conditions weaken the maximum load-bearing capacity of the strand hanger 200, to meet regulatory requirements, the number of reversals in the strand hoist ring is typically limited to no more than three times during conventional construction, which introduces significant inconvenience to on-site hoisting operations.

[0050] In order to improve the safety of the lifting operation, Figures 4 to 9 As shown, the present invention provides a steel strand eye protection device suitable for prefabricated components, including a mold assembly 2 and a casting layer 3, wherein the mold assembly 2 is detachably arranged on the component base 1, and includes a first prefabricated mold 21 and a second prefabricated mold 22. The first prefabricated mold 21 can be demoulded from the component base 1 so that the component base 1 is formed with a first forming notch 11; the second prefabricated mold 22 can be demoulded from the component base 1 so that the component base 1 is formed with a second forming notch 12. The casting layer 3 is filled and arranged in the casting space surrounded by the component base 1 and the mold assembly 2. When the casting layer 3 is configured as a lifting device to lift the component base 1, the surfaces of the casting layer 3 at the first forming notch 11 and the second forming notch 12 can respectively abut against the two ends of the connection portion 42 of the steel strand eye 4. In this embodiment, for the convenience of description, the steel strand eyelet 4 includes a first anchoring portion 41, a connecting portion 42 and a second anchoring portion 43 connected in sequence. The first anchoring portion 41 and the second anchoring portion 43 are both anchored in the component base 1, and the connecting portion 42 is used to connect the lifting device.

[0051] The first precast mold 21 and the second precast mold 22 are detachably arranged in the component base 1. After the casting layer 3 is cured, the first precast mold 21 and the second precast mold 22 are demoulded so that the component base 1 is formed with the first molded notch 11 and the second molded notch 12. When the lifting device lifts the component base 1 through the connection portion 42 connected to the steel strand eye 4, the two ends of the connection portion 42 will respectively stick to the surface of the casting layer 3 at the first molded notch 11 and the second molded notch 12. The first molded notch 11 and the second molded notch 12 formed in the component base 1 can increase the contact area between the steel strand eye 4 and the component base 1, reduce the stress concentration phenomenon that is easy to occur at the connection between the connection portion 42 and the component base 1, reduce the risk of breakage of the steel strand eye 4, and improve the safety of the operation of lifting the component base 1. At the same time, it can also reduce the risk of damage at the connection between the component base 1 and the connection portion 42 during lifting, and improve the structural integrity of the steel strand eye protection device itself suitable for prefabricated components. In addition, the first molding notch 11 and the second molding notch 12 are formed by the mold assembly 2 , and their sizes are standardized and their shapes are controllable, so the construction quality is controllable and the processing difficulty is reduced.

[0052] To facilitate processing and mass production, in this embodiment, the first prefabricated mold 21 and the second prefabricated mold 22 have the same shape and size, and are both made of a terpolymer of acrylonitrile, butadiene and styrene (commonly known as ABS plastic) through 3D printing technology. The wall thickness of the first prefabricated mold 21 and the second prefabricated mold 22 is 5 mm, and will not be repeated here.

[0053] In some embodiments, the first precast mold 21 has an inverted semi-conical shape, that is, the first precast mold 21 is surrounded by a guide surface 213 formed by a semicircular surface, a rectangular surface, and a fan-shaped surface. The distance between the guide surface 213 and the first anchoring portion 41 gradually increases along the axis of the first anchoring portion 41 of the steel strand eye 4. When the first precast mold 21 has an inverted semi-conical shape, after the casting layer 3 is cured and the first precast mold 21 is demolded from the component base 1, the surface of the casting layer 3 at the first molding notch 11 has the same size and shape as the guide surface 213. Providing the first precast mold 21 with a guide surface 213 can optimize the surface shape of the casting layer 3 at the first forming notch 11 after demolding, effectively improve the stress transfer path of the steel strand eye 4 when it is subjected to shear force during the lifting stage, and improve the uniformity of stress distribution. At the same time, it increases the contact area between the connection part 42 and the component base 1, reduces the shear stress concentration at the connection position between the steel strand eye 4 and the component base 1, reduces the risk of fracture of the steel strand eye 4, and improves the mechanical reliability of the steel strand eye 4 under complex stress conditions.

[0054] In some other embodiments, the first precast mold 21 may be in an inverted cone-like shape, that is, the first precast mold 21 is surrounded by a circular surface and a sector-like surface. After the casting layer 3 is cured, the first precast mold 21 is demoulded from the component base 1, and the casting layer 3 forms a surface at the first molding notch 11 that is consistent with the outer contour of the sector-like surface. Preferably, as Figure 4 and Figure 5 As shown, the first prefabricated mold 21 includes a first splicing portion 211 and a second splicing portion 212 that are detachably connected. The first splicing portion 211 and the second splicing portion 212 can be installed on opposite sides of the first anchoring portion 41. Processing the first prefabricated mold 21 into a split-assembly splicing structure rather than an integral structure is conducive to simplifying the installation process of the first prefabricated mold 21. It is understandable that when the first prefabricated mold 21 is set to an inverted cone-like shape that is assembled separately, the first splicing portion 211 and the second splicing portion 212 are both processed with semicircular holes on the side facing the first anchoring portion 41, so that after the two are assembled, the first anchoring portion 41 can be inserted into the component base 1 through the circular hole after the two are assembled. Similarly, the second anchoring portion 43 of the steel strand eyelet 4 can also be inserted into the component base 1 through the circular hole after the second prefabricated mold 22 is assembled. No more details will be given here.

[0055] In this embodiment, the first splicing portion 211 and the second splicing portion 212 are both arc surfaces on the side facing away from the first anchoring portion 41, so that no matter in which direction the component base 1 is placed horizontally, when the component base 1 is pulled up counterclockwise, the first anchoring portion 41 can be in contact with the arc surface of the first splicing portion 211 or the second splicing portion 212, effectively reducing the rigid collision between the connecting portion 42 and the surface of the component base 1, and enhancing the safety and reliability of the lifting operation of the component base 1.

[0056] The mold assembly 2 may also include a blocking member 23, which can be detachably mounted on the preset surface of the component base 1. The first precast mold 21 and the second precast mold 22 are both detachably connected to the blocking member 23, and the first anchoring portion 41 and the second anchoring portion 43 can penetrate into the component base 1 from the preset surface. The blocking member 23 surrounds the preset surface of the component base 1 and is arranged above the first precast mold 21 and the second precast mold 22. The blocking member 23, the first precast mold 21, the second precast mold 22 and the component base 1 can together form a casting space. The provision of the blocking member 23 can reduce the overflow or leakage of concrete slurry and improve the casting quality of the casting layer 3. In this embodiment, the preset surface of the component base 1 is the top surface of the component base 1 after the lifting is completed.

[0057] Specifically, the first precast mold 21 is provided with a first connecting protrusion 214, and the second precast mold 22 is provided with a second connecting protrusion 221. The first connecting protrusion 214 and the second connecting protrusion 221 are both plugged into and matched with the enclosure 23 to enhance the connection between the first precast mold 21 and the second precast mold 22 and the enclosure 23, respectively, and also enhance the definition of the casting range of the casting layer 3. For example, the first precast mold 21 is provided with four first connecting protrusions 214, and the second precast mold 22 is provided with four second connecting protrusions 221. The enclosure 23 is provided with the same number of plug holes as the first connecting protrusions 214 and the second connecting protrusions 221. In other embodiments, the first precast mold 21 can be provided with other numbers of first connecting protrusions 214, and the second precast mold 22 can be provided with other numbers of second connecting protrusions 221, without further limitation herein.

[0058] Furthermore, the steel strand eye protection device for prefabricated components further includes a locking member. A first connecting protrusion 214 at least partially extends beyond the enclosure 23. The locking member and the first connecting protrusion 214 are threadedly engaged and can be pressed against the enclosure 23. The locking member can be a threaded sleeve with an internal thread. A second connecting protrusion 221 can also at least partially extend beyond the enclosure 23. A nut is threadedly engaged with the second connecting protrusion 221 and can be pressed against the enclosure 23, further enhancing the connection between the first and second prefabricated molds 21 and 22 and the enclosure 23, respectively. For example, the first and second connecting protrusions 214 and 221 protrude 10 mm from the top surface of the enclosure 23. The portions of the first and second connecting protrusions 214 and 221 that protrude beyond the enclosure 23 can each be provided with a sealing member to enhance the sealing effect at the connection between the locking member and the nut, respectively, and the enclosure 23. The sealing member can be a sealing ring or a sealing gasket made of silicone rubber, for example.

[0059] In order to limit the damage to the smoothness of the connection surface between the first precast mold 21 and the second precast mold 22 and the casting layer 3 when the enclosure 23 is removed, it can be disassembled by moving it horizontally along the normal direction of the first connecting protrusion 214 and the second connecting protrusion 221, or the surface of the casting layer 3 at the first molding notch 11 and the second molding notch 12 after removal can be smoothed a second time to ensure that the surface is smooth and free of honeycomb surface.

[0060] Alternatively, as Figure 8 and Figure 9As shown, the steel strand eye protection device suitable for prefabricated components also includes a rigid reinforcement assembly 5 that can be anchored within the component base 1. The rigid reinforcement assembly 5 includes embedded reinforcement bars 51 and a first rigid reinforcement member 52 and a second rigid reinforcement member 53, both of which are fixedly connected to the embedded reinforcement bars 51. The first rigid reinforcement member 52 and the second rigid reinforcement member 53 can be welded to the prefabricated component binding steel bars before casting. The first rigid reinforcement member 52 is connected to the first anchoring portion 41, and the second rigid reinforcement member 53 is connected to the second anchoring portion 43. The provision of the first rigid reinforcement member 52, the second rigid reinforcement member 53, and the embedded reinforcement bar 51 can enhance the load-bearing effect of the steel strand eye 4, limit the breakage of the steel strand eye 4 when lifting or vertically lifting the component base 1, and reduce the impact of the overturning condition on the load-bearing capacity of the steel strand eye 4. For example, the first rigid reinforcement member 52 and the second rigid reinforcement member 53 are formed from low-alloy high-strength (Q345B) structural steel, and the surface is hot-dip galvanized to provide excellent corrosion resistance. In order to reduce the load-bearing requirements for a single steel strand eye 4, multiple steel strand eyes 4 can be arranged at preset surface intervals along the component base 1, and correspondingly, multiple first prefabricated molds 21 and multiple second prefabricated molds 22 with the same number as the steel strand eyes 4 are pre-processed.

[0061] Specifically, the first rigid reinforcement 52 can be sleeved on the first anchoring portion 41 and detachably connected to the first precast mold 21, and the second rigid reinforcement 53 can be sleeved on the second anchoring portion 43 and detachably connected to the second precast mold 22. The first rigid reinforcement 52 and the second rigid reinforcement 53 are respectively affixed to the surface of the casting layer 3 at the first molding notch 11 and the second molding notch 12, that is, the first rigid reinforcement 52 is consistent with the shape of the first precast mold 21, and the second rigid reinforcement 53 is consistent with the shape of the second precast mold 22, which reduces the occurrence of the casting material adhering to the surface of the first rigid reinforcement 52 or the second rigid reinforcement 53 when the casting layer 3 is filled, and improves the surface smoothness of the first rigid reinforcement 52 and the second rigid reinforcement 53 after the mold assembly 2 is demolded. When the two ends of the connection part 42 are respectively abutted against the surface of the casting layer 3 at the first forming notch 11 and the second forming notch 12, the load borne by the steel strand eye 4 can also be transmitted to the component base 1 through the first rigid reinforcement 52 and the second rigid reinforcement 53 abutting against the casting layer 3, thereby reducing the load actually required to be borne by the steel strand eye 4 and limiting the breakage of the connection part 42 when lifting.

[0062] For example, the first precast mold 21 and the second precast mold 22 are in an inverted cone-like shape, and correspondingly, the centers of the first rigid reinforcement 52 and the second rigid reinforcement 53 are pre-processed with an inverted cone-like notch, that is, the inner contour is a fan-shaped surface. In order to enhance the connection effect between the first rigid reinforcement 52 and the second rigid reinforcement 53 and the casting layer 3, the outer contours of the first rigid reinforcement 52 and the second rigid reinforcement 53 can be set to be cylindrical, so as to enhance the mechanical bite effect between the first rigid reinforcement 52 and the second rigid reinforcement 53 and the component base 1 provided with the casting layer 3 during the lifting operation, and also enable the concentrated stress transmitted by the steel strand eye 4 to be evenly dispersed to the component base 1 through the 360° annular contact surface, thereby reducing the crack incidence rate of the component base 1 at the connection with the steel strand eye 4, improving the local bearing capacity of the contact surface between the steel strand eye 4 and the casting layer 3, and ensuring the safety of the lifting operation. At the same time, the bending deformation amplitude of the steel strand lifting ring 4 during repeated lifting operations is also reduced, the fatigue failure of the steel strand lifting ring 4 is delayed, the service life is extended, and the maintenance difficulty is reduced.

[0063] In a second aspect, the present invention further provides a method for preparing a steel strand lifting eye protection device suitable for prefabricated components, which is used to pull the above-mentioned steel strand lifting eye protection device suitable for prefabricated components, comprising the following steps:

[0064] S1, installing the first prefabricated mold 21 and the second prefabricated mold 22 into the component base 1;

[0065] S2, inserting the first anchoring portion 41 and the second anchoring portion 43 of the steel strand eyelet 4 into the component base 1;

[0066] S3, filling and setting a casting layer 3 in the casting space enclosed by the component base 1 and the mold assembly 2;

[0067] S4. After the pouring layer 3 is solidified, the mold assembly 2 is removed.

[0068] It is understandable that after step S4 is completed, the connecting portion 42 needs to be connected to a lifting device and the lifting device needs to be started to lift the component base 1 from a horizontal position to a vertical position to be installed.

[0069] When the lifting device does not lift the component base 1, the first precast mold 21 and the second precast mold 22 are placed in the component base 1, and then the casting layer 3 is filled in the casting space surrounded by the component base 1 and the mold assembly 2. After the casting layer 3 is cured, the mold assembly 2 is demoulded from the component base 1, so that the component base 1 is formed with a first molding notch 11 and a second molding notch 12. After starting the lifting device, the lifting device can pull the component base 1 counterclockwise through the steel strand eye 4, so that the component base 1 is switched from a horizontal placement state to a vertical installation state. During this process, the two ends of the connecting portion 42 can respectively abut against the surface of the formed casting layer 3 at the first molding notch 11 and the second molding notch 12, thereby reducing the hidden danger of stress concentration. The present invention uses the first precast mold 21 and the second precast mold 22 to make the first molding notch 11 and the second molding notch 12 in the component base 1, thereby improving the reuse rate of the mold assembly 2 and reducing the difficulty of construction.

[0070] Optionally, before step S1, the component base 1 needs to be constructed, and the embedded position of the first anchoring portion 41 needs to be marked on the first precast mold 21, and the embedded position of the second anchoring portion 43 needs to be marked on the second precast mold 22, ensuring that the coordinate deviation is ≤ 2mm and the elevation error is between ±1mm. In step S1, after the first and second precast molds 21 and 22 are installed, the enclosure 23 can be installed and connected to the first and second precast molds 21 and 22.

[0071] Specifically, step S4 includes the following steps:

[0072] S41, demoulding the first prefabricated mold 21 and the second prefabricated mold 22 from the component base 1, so that the component base 1 is formed with a first molding notch 11 and a second molding notch 12;

[0073] S42 , polishing and grinding the surface of the casting layer 3 at the first molding notch 11 and the second molding notch 12 .

[0074] After demolding the first precast mold 21 and the second precast mold 22, the surface of the casting layer 3 is polished and ground, and then the lifting device is connected to the connecting part 42 to remove the casting material residue and improve the surface smoothness of the casting layer 3 at the first molding notch 11 and the second molding notch 12.

[0075] Exemplarily, the prefabricated component is a concrete component 100. When the compressive strength grade of the concrete component 100 after casting is less than C30 and its own weight is ≤50t, there is no need to set a rigid reinforcement component 5 in the component base 1. The first molding notch 11 and the second molding notch 12 are formed after the component base 1 is demolded by the mold assembly 2, so that the connection part 42 can be in contact with the surface of the casting layer 3 at the first molding notch 11 and the second molding notch 12 when the lifting is carried out, so as to improve the stress distribution at the connection between the connection part 42 and the casting layer 3. At the same time, the smooth fan-shaped surface formed by the mold is used to reduce stress mutations, thereby reducing the crack incidence of the low-strength concrete component 100 and improving the reliability of the lifting operation and the construction economy.

[0076] When the compressive strength grade of the concrete component 100 after casting is ≥ C30 and the deadweight is > 50t, it is necessary to set a rigid reinforcement assembly 5 in the component base 1, place the first precast mold 21 inside the first rigid reinforcement 52, and place the second precast mold 22 inside the second rigid reinforcement 53, and then fill the casting layer 3 into the component base 1. After the casting layer 3 is solidified, the first precast mold 21 and the second precast mold 22 are taken out. When the lifting device pulls the steel strand eye 4, the load borne by the steel strand eye 4 can be transferred to the component base 1 through the first rigid reinforcement 52 and the second rigid reinforcement 53, reducing the load actually borne by the steel strand eye 4, limiting the breakage of the connection part 42 when lifting or lifting the component base 1, and enhancing the safety and reliability of the lifting or lifting operation of the component base 1.

[0077] It is understood that a through hole is reserved in the center of the first rigid reinforcement 52 for the first anchoring portion 41 to pass through, and a through hole is reserved in the center of the second rigid reinforcement 53 for the second anchoring portion 43 to pass through. The first anchoring portion 41 of the steel strand eye 4 can be sequentially inserted into the component base 1 via the first precast mold 21 and the first rigid reinforcement 52, and the second anchoring portion 43 of the steel strand eye 4 can be sequentially inserted into the component base 1 via the second precast mold 22 and the second rigid reinforcement 53. To ensure that the reserved through hole coincides with the designed paths of the first anchoring portion 41 and the second anchoring portion 43, temporary support steel bars can be installed if necessary to prevent displacement of the rigid reinforcement assembly 5 during the pouring process.

[0078] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A steel strand lifting eye protection device suitable for prefabricated components, characterized in that: include: A mold assembly (2) can be detachably arranged on a component base (1), comprising a first prefabricated mold (21) and a second prefabricated mold (22), wherein the first prefabricated mold (21) can be demoulded from the component base (1) so that the component base (1) is formed with a first molding notch (11); and the second prefabricated mold (22) can be demoulded from the component base (1) so that the component base (1) is formed with a second molding notch (12). A casting layer (3) is filled and arranged in a casting space enclosed by the component base (1) and the mold assembly (2); when the component base (1) is lifted by a lifting device, the surfaces of the casting layer (3) at the first forming notch (11) and the second forming notch (12) can respectively abut against the two ends of the connection portion (42) of the steel strand lifting ring (4).

2. The steel strand lifting eye protection device suitable for prefabricated components according to claim 1, characterized in that: The first prefabricated mold (21) is provided with a guide surface (213), and along the axial direction of the first anchoring portion (41) of the steel strand suspension ring (4), the distance between the guide surface (213) and the first anchoring portion (41) gradually increases.

3. The steel strand lifting eye protection device suitable for prefabricated components according to claim 1, characterized in that: The first prefabricated mold (21) comprises a first splicing portion (211) and a second splicing portion (212) that are detachably connected, and the first splicing portion (211) and the second splicing portion (212) can be installed on opposite sides of the first anchoring portion (41) of the steel strand eye (4).

4. The steel strand lifting eye protection device suitable for prefabricated components according to claim 1, characterized in that: The mold assembly (2) further comprises a blocking member (23), wherein the blocking member (23) can be detachably blocked on a preset surface of the component base (1), and the first prefabricated mold (21) and the second prefabricated mold (22) are both detachably connected to the blocking member (23).

5. The steel strand lifting eye protection device suitable for prefabricated components according to claim 4, characterized in that: The first prefabricated mold (21) is provided with a first connecting protrusion (214), and the second prefabricated mold (22) is provided with a second connecting protrusion (221). Both the first connecting protrusion (214) and the second connecting protrusion (221) are plug-fitted with the enclosure (23).

6. The steel strand lifting eye protection device suitable for prefabricated components according to claim 5, characterized in that: The steel strand eye protection device suitable for prefabricated components further comprises a locking member, wherein the first connecting protrusion (214) at least partially passes through the enclosure member (23), and the locking member and the first connecting protrusion (214) are threadedly matched and can be pressed against the enclosure member (23).

7. The steel strand lifting eye protection device for prefabricated components according to any one of claims 1 to 6, characterized in that: The steel strand eye protection device suitable for prefabricated components further comprises a rigid reinforcement assembly (5) capable of being anchored in the component base (1), the rigid reinforcement assembly (5) comprising a pre-embedded reinforcement (51) and a first rigid reinforcement member (52) and a second rigid reinforcement member (53) both fixedly connected to the pre-embedded reinforcement (51), the first rigid reinforcement member (52) being connected to the first anchoring portion (41) of the steel strand eye (4), and the second rigid reinforcement member (53) being connected to the second anchoring portion (43) of the steel strand eye (4).

8. The steel strand lifting eye protection device suitable for prefabricated components according to claim 7, characterized in that: The first rigid reinforcement member (52) can be sleeved on the first anchoring portion (41) and detachably connected to the first precast mold (21); the second rigid reinforcement member (53) can be sleeved on the second anchoring portion (43) and detachably connected to the second precast mold (22); the first rigid reinforcement member (52) and the second rigid reinforcement member (53) are respectively abutted against the surface of the casting layer (3) at the first molding notch (11) and the second molding notch (12).

9. A method for preparing a steel strand lifting eye protection device suitable for prefabricated components, for preparing the steel strand lifting eye protection device suitable for prefabricated components according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, installing the first prefabricated mold (21) and the second prefabricated mold (22) into the component base (1); S2, inserting the first anchoring portion (41) and the second anchoring portion (43) of the steel strand lifting ring (4) into the component base (1); S3, filling and setting a casting layer (3) in the casting space enclosed by the component base (1) and the mold assembly (2); S4. After the pouring layer (3) is solidified, the mold assembly (2) is removed.

10. The method for preparing a steel strand lifting eye protection device suitable for prefabricated components according to claim 9, characterized in that: Step S4 includes the following steps: S41, demoulding the first prefabricated mold (21) and the second prefabricated mold (22) from the component base (1), so that the component base (1) is formed with a first molding notch (11) and a second molding notch (12); S42, polishing and grinding the surface of the casting layer (3) at the first molding notch (11) and the second molding notch (12).

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