Post-tensioning bonded prestress leveling layer structure and construction method

Abstract

The invention relates to a post-tensioning method bonded prestress leveling layer structure and a construction method thereof, the post-tensioning method bonded prestress leveling layer structure comprises a leveling layer, steel strands and corrugated pipes, the thickness of the leveling layer is 5-8 cm, the corrugated pipes are arranged in the leveling layer in a criss-cross mode to form a net shape, the steel strands are arranged in the corrugated pipes in a penetrating mode, the outer diameter of the corrugated pipes is 14-20 mm, and the diameter of the steel strands is 6-12 mm; and a micro-resistance layer is arranged between the leveling layer and the structural layer. According to the post-tensioned bonded prestress leveling layer structure provided by the invention, the post-tensioned bonded prestress is applied to the leveling layer, so that large-area seamless construction of the prestressed leveling layer can be realized. And by means of a prestress system, the concrete slab is always in a pressed state, the cracking problem caused by temperature change or load action is effectively avoided, and the integrity and durability of the leveling layer are enhanced.

Description

Technical Field

[0001] This invention relates to the field of prestressing technology, and in particular to a post-tensioned bonded prestressed leveling layer structure and its construction method. Background Technology

[0002] Prestressed concrete structures are structures that are pre-stressed before being subjected to loads. This causes compressive stress to be generated in the tensile zone of the concrete when external loads are applied, which is used to offset or reduce the tensile stress generated by external loads, improve the stiffness of the components, and prevent cracks from forming or delay the appearance of cracks under normal use. Therefore, prestressed structures are widely used in the field of prestressed monolithic flooring.

[0003] A leveling layer is a structural layer with a certain strength and flatness laid on top of the structural layer. Currently, leveling layers for floors or basements are prone to warping, hollowing, and cracking. Moreover, the leveling layer is easily affected by the structural layer that serves as the base layer; deformation of the structural layer can also cause problems such as hollowing and cracking in the leveling layer. Summary of the Invention

[0004] The purpose of this disclosure is to provide a post-tensioned bonded prestressed leveling layer structure and construction method to alleviate the problems of warping, hollowing and cracking that easily occur in the leveling layer in the prior art.

[0005] Based on the above objectives, this disclosure provides a post-tensioned bonded prestressed leveling layer structure, including a leveling layer, steel strands, and corrugated pipes. The thickness of the leveling layer is 5-8 cm. The corrugated pipes are arranged in a crisscross pattern within the leveling layer. The steel strands are threaded through the corrugated pipes. The outer diameter of the corrugated pipes is 14-20 mm, and the diameter of the steel strands is 6-12 mm. A micro-resistance layer is provided between the leveling layer and the structural layer. The micro-resistance layer includes a first micro-resistance layer and a second micro-resistance layer disposed on the first micro-resistance layer. The first micro-resistance layer includes a flat layer of fine sand, and the second micro-resistance layer includes at least one flat layer of thin film.

[0006] In one embodiment of this disclosure, the corrugated pipe has a circular cross-section, and the number of steel strands is one bundle.

[0007] In one embodiment of this disclosure, the second microresistive layer includes at least two flat films, the films being PE films, each film being formed by multiple adjacent monolithic films, and the seams of the adjacent monolithic films of different layers being staggered.

[0008] In one embodiment of this disclosure, the leveling layer includes at least two layers arranged at intervals along the horizontal direction, and an armor seam connects the two adjacent layers. The armor seam includes two opposing vertical plates.

[0009] In one embodiment of this disclosure, a tensioning end anchor is further included, the tensioning end anchor including an anchor plate connected to the vertical plate; the vertical plate is provided with a tensioning hole, and one end of the steel strand passes through the tensioning end anchor and through the tensioning hole.

[0010] In one embodiment of this disclosure, horizontal plates extending in a horizontal direction are respectively connected above the two vertical plates. The horizontal plates are connected to cover plates. When the cover plates are connected to the horizontal plates, the cover plates cover the gap between the two vertical plates.

[0011] To achieve the above objectives, this disclosure also provides a construction method applied to the post-tensioned bonded prestressed leveling layer structure, the construction method comprising the following steps: The surface of the structural layer is treated and repaired; Fine sand is spread evenly on the surface of the structural layer to form the first micro-resistance layer; At least one thin film is deposited on the first microresistive layer to form a second microresistive layer; The corrugated pipes are arranged in a crisscross pattern to form a mesh, and the steel strands are threaded inside the corrugated pipes. Pour concrete to form a leveling layer; Tensioning the steel strands; After tensioning, the corrugated pipe is grouted.

[0012] In one embodiment of this disclosure, in the step of tensioning the steel strand, a staged tensioning method is adopted. When the concrete strength reaches 10 MPa or above, the steel strand is tensioned for the first time, and the subsequent tensioning work is completed before the concrete reaches the design strength.

[0013] In one embodiment of this disclosure, in the steps of arranging corrugated pipes and threading steel strands, the armor seam is installed on the structural plate, the anchor plate of the tensioning end anchor is connected to the upright plate of the armor seam, and one end of the steel strand threaded in the corrugated pipe is threaded into the tensioning end anchor and passes through the tensioning hole of the upright plate.

[0014] In one embodiment of this disclosure, after one end of the steel strand is inserted into the tensioning end anchor and passes through the tensioning hole of the vertical plate, a jack is placed in the gap between the two vertical plates to tension the steel strand; after the tensioning step is completed, the jack is removed and a cover plate is used to cover the gap between the two vertical plates.

[0015] The main beneficial effects of this disclosure are: The post-tensioned bonded prestressed leveling layer structure disclosed herein applies post-tensioned bonded prestressing to the leveling layer, enabling seamless construction over large areas. Utilizing the prestressing system, the prestressed leveling layer counteracts external tensile stress through pre-compression stress, keeping the concrete slab under constant compression. This controls concrete cracking at its source, effectively avoiding cracking caused by temperature changes or load effects, significantly reducing the need for expansion joints, and enhancing the integrity and durability of the leveling layer. A micro-resistance layer is placed between the leveling layer and the structural layer. This micro-resistance layer includes a first micro-resistance layer and a second micro-resistance layer placed on top of the first. The first micro-resistance layer comprises a flat layer of fine sand, and the second micro-resistance layer comprises at least one flat layer of thin film. This ensures that the leveling layer is unaffected by the structural layer; even if cracks appear in the structural layer, the flatness and integrity of the leveling layer remain unaffected, further improving its service life and stability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a post-tensioned bonded prestressed leveling layer structure provided in an embodiment of this disclosure; Figure 2 A schematic diagram of the micro-resistive layer 30 with bonded prestressed leveling layer structure provided in the embodiments of this disclosure; Figure 3 A flowchart of the construction method provided in the embodiments of this disclosure; Figure 4 Another flowchart of the construction method provided in this disclosure embodiment. Detailed Implementation

[0018] The technical solutions of this disclosure will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this disclosure, not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0019] See Figures 1 to 2As shown, this embodiment provides a post-tensioned bonded prestressed leveling layer structure, including a leveling layer 10 disposed above a structural layer 20. A micro-resistance layer 30 is provided between the leveling layer 10 and the structural layer 20. The micro-resistance layer 30 includes a first micro-resistance layer 31 and a second micro-resistance layer 32 disposed above the first micro-resistance layer 31. The first micro-resistance layer 31 includes a flat layer of fine sand, and the second micro-resistance layer 32 includes at least one flat layer of thin film. The micro-resistance layer 30 between the leveling layer 10 and the structural layer 20 effectively isolates the structural layer and the leveling layer, reduces frictional resistance, and reduces the risk of the prestressed leveling layer concrete slab cracking.

[0020] In some embodiments, the second microresistive layer 32 comprises at least two layers of flat film, wherein the film is a PE film. Since the film is typically a roll-shaped packaging structure with a certain width, it is usually necessary to connect individual films adjacent to each other to achieve the purpose of covering the entire ground surface. Each layer of film is composed of multiple adjacent individual films, and the seams 33 of the adjacent films of different layers are staggered. See [reference needed]. Figure 2 The adjacent seams 33 of the single film in the upper layer are staggered from those of the single film in the lower layer. That is, the adjacent seams 33 of the films in different layers are staggered along the projection direction perpendicular to the plane of the leveling layer. This prevents sand from the first micro-resistance layer 31 from entering the film through the adjacent seams 33, and also prevents concrete from the leveling layer from flowing into the structural layer, ensuring the structural layer and the leveling layer are isolated, reducing frictional resistance, and avoiding the influence of the structural layer. In some embodiments, the thickness of the first micro-resistance layer 31 is 0.1mm to 3mm, and it is made by thinly spreading a layer of fine sand on the surface of the structural layer.

[0021] In some embodiments, the thickness of the leveling layer 10 is 5-8 cm. The leveling layer structure of this disclosure also includes steel strands 2 and corrugated pipes 3. The corrugated pipes 3 are arranged in a crisscross pattern to form a mesh within the leveling layer 10. Specifically, the corrugated pipes 3 are first placed on the structural layer 20 in a crisscross pattern on the structural layer 20, and then concrete is poured to form the leveling layer 10. The corrugated pipes 3 are completely embedded within the leveling layer 10, and no part of the corrugated pipes 3 protrudes from the leveling layer 10. The steel strands 2 are threaded through the corrugated pipes 3. The outer diameter of the corrugated pipes 3 is 14-20 mm, especially the outer diameter along the direction perpendicular to the plane of the leveling layer 10. The diameter of the steel strands 2 is 6-12 mm. In some embodiments, the corrugated pipes 3 are stacked in a crisscross pattern to form a mesh structure. In some embodiments, the cross-section of the corrugated pipes 3 is circular, and the number of steel strands 2 is one bundle. In some embodiments, the outer diameter of the corrugated pipe 3 is 19~20mm, especially the outer diameter of the pipe along the direction perpendicular to the plane where the leveling layer 10 is located is 19~20mm, the inner diameter of the corrugated pipe 3 is 16±1mm, and the diameter of the steel strand 2 is 9~10mm, so that the prestressing tension strength is strong enough, while ensuring that the corrugated pipe 3 maintains sufficient grouting space, so that the prestressed structure is stable.

[0022] In some embodiments, the leveling layer 10 includes at least two layers spaced apart in a horizontal direction, see [reference]. Figure 1 An armor seam 4 connects two adjacent layers, and the leveling layers 10 located on both sides of the armor seam 4 are two layers arranged at intervals. In some embodiments, the armor seam 4 includes two opposing vertical plates 41 with a gap between them, and the vertical plates 41 extend in a direction perpendicular to the plane of the leveling layer. In some embodiments, horizontal plates 42 extending in a horizontal direction are respectively connected above the two vertical plates 41, and the horizontal plates 42 are connected to the vertical plates 41 in an L-shape, extending towards the leveling layer layer relative to the vertical plates 41.

[0023] In some embodiments, the armor seam also includes angle steel 43, the number of which is the same as that of the upright plate 41, also two. The angle steel 43 can be installed on the structural plate. Specifically, the angle steel 43 is L-shaped, including a transverse section 431 and a longitudinal section 432. The transverse section 431 is connected to the lower end of the longitudinal section 432 and extends away from the leveling layer, that is, the transverse sections 431 of both angle steels 43 extend towards the gap between the two upright plates 41. The transverse section 431 of the angle steel 43 can be locked to the structural plate 20 by bolts or other fasteners, and the longitudinal section 432 of the angle steel 43 is connected to the lower end of the upright plate 41. Specifically, in actual construction, the transverse section 431 of the angle steel 43 is first locked to the structural plate 20, and the distance between the two angle steels 43 can be determined according to the distance between the two layers arranged at actual intervals. After fixing the angle steel 43, the lower end of the upright plate 41 is placed against the longitudinal section 432 of the angle steel 43, so that the lower end of the upright plate 41 abuts against the longitudinal section 432 of the angle steel 43 and partially overlaps it. According to the actual thickness of the leveling layer 10, the relative position of the upright plate 41 and the longitudinal section 432 is adjusted and determined. Then, the lower end of the upright plate 41 and the longitudinal section 432 of the angle steel 43 are fixedly connected by welding or other fixing methods. In some embodiments, the armor joint 4 also includes shear nails 45. The shear nails 45 are connected to the upright plate 41 and extend towards the leveling layer. The shear nails 45 extend downward at a certain angle. When concrete is poured, the shear nails 45 are poured into the concrete, which can transmit the shear force between the armor joint 4 and the leveling layer 10 and prevent relative slippage between the two.

[0024] In some embodiments, a cover plate 44 is connected to the horizontal plate 42. When the cover plate 44 is connected to the horizontal plate 42, the cover plate 44 covers the gap between the two vertical plates 41. In some embodiments, a tensioning end anchor 5 is also included. The tensioning end anchor 5 includes an anchor plate 51, which is connected to the vertical plate 41. The vertical plate 41 is provided with a tensioning hole (not shown in the figure). One end of the steel strand 2 passes through the tensioning end anchor 5 and through the tensioning hole.

[0025] In this embodiment, the transverse sections 431 of the two angle steels 43 extend towards the gap between the two vertical plates 41, preventing the angle steels 43 from interfering with the tensioning end anchor 5 and providing sufficient space for the tensioning end anchor 5. The relative position of the two angle steels 43 can be adjusted according to the actual situation, and the connection position between the vertical plate 41 and the longitudinal section 432 of the angle steel 43 is adjustable, making the armor seam structure universal and adaptable to various construction conditions. By setting tensioning holes on the vertical plate 41, the anchor plate 51 of the tensioning end anchor 5 is directly connected to the vertical plate 41, thus eliminating the need to set up a separate template for the tensioning end anchor 5, saving processes, construction time, and reducing costs. The cover plate 44 abuts against the transverse plate 42 of the armor seam at both ends, and a cover plate of appropriate width can be customized according to the actual situation in the later stages of the construction period. Using the structure of this embodiment, there is no need to set up a post-pouring strip. After the armor seam 4 is installed, the gap between the two upright plates 41 of the armor seam 4 can accommodate the jack to tension the steel strand 2. After the tensioning is completed and the anchor is sealed, the jack is removed and the cover plate 44 is placed over the gap between the two upright plates 41.

[0026] This embodiment also provides a construction method, which is applied to the post-tensioned bonded prestressed leveling layer structure provided in this embodiment. See [link to relevant documentation]. Figure 3 As shown, the mattress packaging method provided in this embodiment includes the following steps: Step S1: Treat and repair the surface of the structural layer; Step S2: Spread fine sand evenly on the surface of the structural layer to form the first micro-resistance layer; Step S3: Deposit at least one thin film on the first microresistive layer to form a second microresistive layer; Step S4: Arrange the corrugated pipes in a crisscross pattern to form a mesh, and thread the steel strands through the corrugated pipes; Step S5: Pour concrete to form a leveling layer; Step S6: Tension the steel strands; Step S7: After tensioning, grout the corrugated pipe.

[0027] The construction method provided in this embodiment first requires processing and repairing the structural layer 20, which serves as the base layer. Specifically, this includes repairing defects in the structural layer 20, firstly by leveling the grid and setting a reference elevation, then milling and leveling the base layer, removing high points and filling pits, and finally verifying the elevation. After complete repair, the surface of the structural layer is smooth and free of pits or protrusions. Next, fine sand is spread evenly on the repaired structural layer surface to form a first micro-resistance layer 31. In some embodiments, the thickness of the first micro-resistance layer 31 is 0.1mm to 3mm, and a thin layer of fine sand is spread evenly on the surface of the structural layer. After the first micro-resistance layer 31 is laid, at least one thin film is then laid on top of the first micro-resistance layer 31 to form a second micro-resistance layer 32.

[0028] In some embodiments, the second micro-resistance layer 32 comprises at least two layers of flat film, the film being PE film; in other embodiments, the film may also be made of other materials such as PP, PVC, or PET. Since the film is typically a roll-shaped packaging structure with a certain width, individual films usually need to be joined together to achieve the purpose of covering the entire ground surface. Each layer of film comprises multiple individual films joined together, and the adjacent seams 33 of the individual films of different layers are staggered. The adjacent seams 33 of the individual films of the upper layer are staggered from those of the individual films of the lower layer. That is, the adjacent seams 33 of the individual films of different layers are staggered along the projection direction perpendicular to the plane of the leveling layer, thereby preventing sand from the first micro-resistance layer 31 from entering the film through the adjacent seams 33, and simultaneously preventing concrete from the leveling layer from flowing into the structural layer, ensuring that the structural layer 20 and the leveling layer 10 are isolated, reducing frictional resistance, and avoiding the influence of the structural layer.

[0029] Next, the prestressed tendons are arranged, specifically including: the corrugated pipes 3 are stacked in a crisscross pattern to form a mesh, and several supports are used to erect and suspend the corrugated pipes 3 above the structural layer. Then, the steel strands 2 are threaded through the corrugated pipes 3, specifically: the steel strands 2 are wound in a reel and manually or with a threading machine, and the length is measured and cut with an abrasive cutter. When concrete is subsequently poured to form the leveling layer 10, the corrugated pipes 3 are completely embedded within the leveling layer 10, with no part of the corrugated pipes 3 protruding from the leveling layer 10. In some embodiments, the outer diameter of the corrugated pipe 3 is 14-20 mm, particularly the outer diameter along the plane perpendicular to the leveling layer 10, and the diameter of the steel strands 2 is 6-12 mm. In some embodiments, the cross-section of the corrugated pipe 3 is circular, and the number of steel strands 2 is one bundle. In some embodiments, the outer diameter of the corrugated pipe 3 along the direction perpendicular to the plane of the leveling layer 10 is 19~20mm, the inner diameter of the corrugated pipe 3 is 16±1mm, and the diameter of the steel strand 2 is 9~10mm, thereby ensuring sufficient prestressing tension strength while maintaining sufficient grouting space in the corrugated pipe 3, resulting in good stability of the prestressed structure. In some embodiments, the cross-section of the corrugated pipe 3 is circular, and the number of steel strands 2 is one bundle.

[0030] After the prestressed tendon arrangement is completed, concrete pouring begins. The concrete mixer truck arrives on site, unloads into a pump truck, and pumps the concrete to the work site. A handheld vibrator is used for vibration. During the concrete pouring process, the site supervisor must strictly fulfill their responsibilities to ensure the safety of embedded components such as steel strands 2 and corrugated pipes 3, preventing damage during construction. The concrete is quickly leveled to the required elevation, then vibrated and leveled. A laser leveling instrument or a leveling beam is used to level the vibrated concrete again, followed by a final leveling with a 3-meter screed or a push-pull ruler.

[0031] In one embodiment, see Figure 4 As shown, tensioning is performed after concrete pouring. In the tensioning of steel strand 2, a staged tensioning method is adopted. When the concrete strength reaches 10 MPa or higher, step S6-1, the steel strand 2 is tensioned for the first time. Before the concrete reaches its design strength, step S6-2, the subsequent tensioning work is completed. Subsequent tensioning can be done once or multiple times. During each tensioning process, care should be taken not to tension rapidly all at once; a slow tensioning method should be used to complete the tensioning work. In step S7, after the tensioning work is completed, the anchor is sealed, and then the corrugated pipe 3 is grouted. After the grout has solidified, the excess grouting pipe is cut off.

[0032] In one embodiment, see Figure 4 As shown, in step S4, the process of arranging the corrugated pipes 3 and threading the steel strands 2 involves installing the armor seam 4 onto the structural plate 20. Since the leveling layer has a large area, it can be divided into several horizontally spaced layers depending on the actual situation. In this embodiment, the leveling layer 10 includes at least two spaced layers, with the armor seam 4 connecting adjacent layers. It should also be noted that the installation of the armor seam 4 can be performed simultaneously with the arrangement of the corrugated pipes 3, or sequentially.

[0033] In one embodiment, the armor seam 4 includes two opposing vertical plates 41 with a gap between them, and the vertical plates 41 extend in a direction perpendicular to the plane of the leveling layer. In some embodiments, horizontal plates 42 extending in a horizontal direction are respectively connected above the two vertical plates 41, the horizontal plates 42 are connected to the vertical plates 41 in an L-shape, and the horizontal plates 42 extend towards the leveling layer relative to the vertical plates 41. In this embodiment, the gap between the two vertical plates 41 is approximately 40-50 cm wide, which can be used to accommodate the jacks used for tensioning. One end of the layer is provided with a tensioning end anchor 5, which includes an anchor plate 51 connected to the vertical plate 41. In one embodiment, the anchor plate 51 is a single-hole type, adapted to accommodate a single bundle of steel strands 2. The vertical plate 41 is provided with a tensioning hole, through which one end of the steel strand passing through the corrugated pipe is passed into the tensioning end anchor 5 and through the tensioning hole.

[0034] In one embodiment, see Figure 4 As shown, after one end of the steel strand is inserted into the tensioning end anchor and passes through the tensioning hole of the vertical plate, the jack is placed in the gap between the two vertical plates 41 to tension the steel strand 2, and then the anchor is sealed. After the tensioning step is completed, the jack is removed and a cover plate is used to cover the gap between the two vertical plates.

[0035] In some embodiments, the armor seam also includes angle steel 43, the number of which is the same as that of the upright plate 41, also two. The angle steel 43 can be installed on the structural plate. Specifically, the angle steel 43 is L-shaped, including a transverse section 431 and a longitudinal section 432. The transverse section 431 is connected to the lower end of the longitudinal section 432 and extends away from the leveling layer, that is, the transverse sections 431 of both angle steels 43 extend towards the gap between the two upright plates 41. The transverse section 431 of the angle steel 43 can be locked to the structural plate 20 by bolts or other fasteners, and the longitudinal section 432 of the angle steel 43 is connected to the lower end of the upright plate 41. Specifically, in actual construction, the transverse section 431 of the angle steel 43 is first locked to the structural plate 20, and the distance between the two angle steels 43 can be determined according to the distance between the two layers arranged at actual intervals. After fixing the angle steel 43, the lower end of the upright plate 41 is placed against the longitudinal section 432 of the angle steel 43, so that the lower end of the upright plate 41 abuts against the longitudinal section 432 of the angle steel 43 and partially overlaps it. According to the actual thickness of the leveling layer 10, the relative position of the upright plate 41 and the longitudinal section 432 is adjusted and determined. Then, the lower end of the upright plate 41 and the longitudinal section 432 of the angle steel 43 are fixedly connected by welding or other fixing methods. In some embodiments, the armor joint 4 also includes shear nails 45. The shear nails 45 are connected to the upright plate 41 and extend towards the leveling layer. The shear nails 45 extend downward at a certain angle. When concrete is poured, the shear nails 45 are poured into the concrete, which can transmit the shear force between the armor joint 4 and the leveling layer 10 and prevent relative slippage between the two.

[0036] Using the construction method of this embodiment, there is no need to set up a post-pouring strip. After the armor seam 4 is installed, the gap between the two upright plates 41 of the armor seam 4 can accommodate the jack to tension the steel strand 2. After the tensioning is completed and the anchor is sealed, the jack is removed and the cover plate 44 is placed over the gap between the two upright plates 41, thus completing all the procedures. The operation is convenient, the construction period is short, and it has great application prospects.

[0037] It should be noted that in this embodiment, "parallel" and "perpendicular" refer to being roughly parallel and roughly perpendicular, respectively.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A post-tensioned bonded prestressed leveling layer structure, characterized in that, It includes a leveling layer, steel strands and corrugated pipes. The thickness of the leveling layer is 5-8cm. The corrugated pipes are arranged in a crisscross pattern to form a network within the leveling layer. The steel strands are threaded through the corrugated pipes. The outer diameter of the corrugated pipes is 14-20mm, and the diameter of the steel strands is 6-12mm. A micro-resistance layer is provided between the leveling layer and the structural layer. The micro-resistance layer includes a first micro-resistance layer and a second micro-resistance layer disposed on the first micro-resistance layer. The first micro-resistance layer includes a flat layer of fine sand, and the second micro-resistance layer includes at least one flat layer of thin film.

2. The post-tensioned bonded prestressed leveling layer structure according to claim 1, characterized in that, The corrugated pipe has a circular cross-section, and the steel strands are in bundles.

3. The post-tensioned bonded prestressed leveling layer structure according to claim 1, characterized in that, The second microresistive layer comprises at least two flat films, wherein the films are PE films, each film layer is composed of multiple single films joined together, and the seams of the single films of different layers are staggered.

4. The post-tensioned bonded prestressed leveling layer structure according to claim 1, characterized in that, The leveling layer comprises at least two layers arranged at intervals along the horizontal direction, and an armor seam connects the two adjacent layers. The armor seam comprises two vertical plates arranged opposite each other.

5. A post-tensioned bonded prestressed leveling layer structure according to claim 4, characterized in that, It also includes a tensioning end anchor, which includes an anchor plate connected to the vertical plate; the vertical plate is provided with a tensioning hole, and one end of the steel strand passes through the tensioning end anchor and through the tensioning hole.

6. A post-tensioned bonded prestressed leveling layer structure according to claim 4, characterized in that, Above each of the two upright plates is a horizontal plate extending in a horizontal direction. The horizontal plate is connected to a cover plate. When the cover plate is connected to the horizontal plate, the cover plate covers the gap between the two upright plates.

7. A construction method, characterized in that, The construction method is applied to the post-tensioned bonded prestressed leveling layer structure as described in any one of claims 1 to 6, and the construction method includes the following steps: The surface of the structural layer is treated and repaired; Fine sand is spread evenly on the surface of the structural layer to form the first micro-resistance layer; At least one thin film is deposited on the first microresistive layer to form a second microresistive layer; The corrugated pipes are arranged in a crisscross pattern to form a mesh, and the steel strands are threaded inside the corrugated pipes. Pour concrete to form a leveling layer; Tensioning the steel strands; After tensioning, the corrugated pipe is grouted.

8. A construction method according to claim 7, characterized in that, In the step of tensioning the steel strand, a staged tensioning method is adopted. When the concrete strength reaches 10 MPa or above, the steel strand is tensioned for the first time, and the subsequent tensioning work is completed before the concrete reaches the design strength.

9. A construction method according to claim 7, characterized in that, In the steps of arranging corrugated pipes and threading steel strands, the armor seam is installed on the structural plate, the anchor plate of the tensioning end anchor is connected to the vertical plate of the armor seam, and one end of the steel strand threaded in the corrugated pipe is threaded into the tensioning end anchor and passes through the tensioning hole of the vertical plate.

10. A construction method according to claim 9, characterized in that, After one end of the steel strand is inserted into the tensioning end anchor and passes through the tensioning hole of the vertical plate, the jack is placed in the gap between the two vertical plates to tension the steel strand; after the tensioning step is completed, the jack is removed and a cover plate is used to cover the gap between the two vertical plates.

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