CN-121992923-A - Post-tensioning bonded prestressed leveling layer structure and construction method

CN121992923ACN 121992923 ACN121992923 ACN 121992923ACN-121992923-A

Abstract

The invention relates to a post-tensioning bonded prestress leveling layer structure and a construction method thereof, wherein the structure comprises a leveling layer, steel strands and a corrugated pipe, the thickness of the leveling layer is 5-8 cm, the corrugated pipes are arranged in the leveling layer in a crisscross manner, the steel strands penetrate through the corrugated pipe, the outer diameter of the corrugated pipe is 14-20 mm, 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. The post-tensioning method provided by the invention has the bonding prestress leveling layer structure, and the post-tensioning method has the bonding prestress applied to the leveling layer, so that the prestress leveling layer can realize large-area seamless construction. By means of the prestress system, the concrete slab is always in a pressed state, so that the cracking problem caused by temperature change or load action is effectively avoided, and the integrity and durability of the leveling layer are enhanced.

Inventors

Guo Chongnian
ZHANG LINA
GAO YONGSEN
WANG KEXIN

Assignees

厦门玛仕特科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260324

Claims (10)

1. The post-tensioning method has a bonding prestress leveling layer structure and is characterized by comprising a leveling layer, steel strands and a corrugated pipe, wherein the thickness of the leveling layer is 5-8 cm, the corrugated pipes are crisscrossed to form a net-shaped arrangement in the leveling layer, the steel strands penetrate into the corrugated pipe, the outer diameter of the corrugated pipe is 14-20 mm, and the diameter of the steel strands is 6-12 mm; The leveling layer is characterized in that a micro-resistance layer is arranged between the leveling layer and the structural layer, the micro-resistance layer comprises a first micro-resistance layer and a second micro-resistance layer arranged on the first micro-resistance layer, the first micro-resistance layer comprises tiled fine sand, and the second micro-resistance layer comprises at least one layer of tiled film.
2. The post-tensioned bonded prestressed screed structure of claim 1 wherein the cross section of the bellows is circular and the number of strands is one bundle.
3. The post-tensioned bonded prestressed screed structure of claim 1 wherein the second microresistance layer comprises at least two layers of tiled films, wherein the films are PE films, each layer of film is formed by abutting a plurality of individual films, and abutting seams of abutting individual films of different layers of films are offset from each other.
4. The post-tensioning bonded prestressed screed-coat structure of claim 1, wherein the screed comprises at least two layers arranged at intervals along a horizontal direction, armor seams are connected between two adjacent layers, and the armor seams comprise two vertical plates arranged oppositely.
5. The post-tensioning bonded prestressed screed-coat structure of claim 4, further comprising a tensioning end anchor comprising an anchor pad connected to said riser, said riser having a tensioning aperture, said steel strand having one end disposed through said tensioning aperture and through said tensioning aperture.
6. The post-tensioned bonded prestressed screed structure of claim 4 wherein each of said risers has a horizontally extending cross plate attached thereto, said cross plates having a cover plate attached thereto, said cover plate covering the gap between two of said risers when said cover plate is attached to said cross plates.
7. A construction method, characterized in that the construction method is applied to the post-tensioning bonded prestressed screed structure according to any one of claims 1 to 6, the construction method comprising the steps of: treating and repairing the surface of the structural layer; spreading fine sand on the surface of the structural layer to form a first micro-resistance layer; paving at least one layer of film on the first micro-resistance layer to form a second micro-resistance layer; Crisscross arranging the corrugated pipes to form a net shape, and penetrating the steel stranded wires into the corrugated pipes; pouring concrete to form a leveling layer; stretching the steel strand; and grouting the corrugated pipe after tensioning.
8. The construction method according to claim 7, wherein in the step of tensioning the steel strand, a method of tensioning the steel strand in several times is adopted, and when the strength of the concrete reaches 10Mpa or more, the steel strand is tensioned for the first time, and the subsequent tensioning work is completed before the concrete reaches the design strength.
9. The construction method according to claim 7, wherein in the step of arranging the corrugated pipe and penetrating the steel strand, the armor slit is installed on the structural plate, the anchor pad of the tension end anchor is connected to the riser of the armor slit, and one end of the steel strand penetrating the corrugated pipe is penetrated in the tension end anchor and penetrates through Zhang Lakong of the riser.
10. The construction method according to claim 9, wherein after the step of inserting one end of the steel strand into the anchor at the tension end and through the tension hole of the vertical plate, the jack is placed into the gap between the two vertical plates, the steel strand is tensioned, and after the tensioning step, the jack is withdrawn, and the gap between the two vertical plates is covered with the cover plate.

Description

Post-tensioning bonded prestressed leveling layer structure and construction method Technical Field The invention relates to the technical field of prestressing, in particular to a post-tensioning bonded prestressing leveling layer structure and a construction method. Background The prestressed concrete structure is characterized in that the prestressed concrete structure is subjected to pressure in advance before the structure bears load, so that the internal force of the concrete in a tension area generates compressive stress when the external load acts, the compressive stress generated by the external load is counteracted or reduced, the rigidity of a component is improved, and the structure does not generate cracks or delays the occurrence time of the cracks under the normal use condition, so that the prestressed structure is widely applied to the field of prestressed integral terraces. A screed refers to a layer of construction having a certain strength and flatness laid over a layer of construction. At present, the leveling layer of the floor or basement is easy to warp and crack in hollows. Moreover, the leveling layer is easily affected by the structural layer as the base layer, and when the structural layer is deformed, the problems of hollowing, cracking and the like of the leveling layer are caused. Disclosure of Invention The invention aims to provide a post-tensioning bonded prestressed leveling layer structure and a construction method thereof, so as to solve the problems that a leveling layer in the prior art is easy to warp and hollowing and cracking. Based on the above purpose, the disclosure provides a post-tensioning method bonded prestress leveling layer structure, which comprises a leveling layer, steel strands and a corrugated pipe, wherein the thickness of the leveling layer is 5-8 cm, the corrugated pipes are crisscrossed to form a net shape and are arranged in the leveling layer, the steel strands penetrate through the corrugated pipe, the outer diameter of the corrugated pipe is 14-20 mm, and the diameter of the steel strands is 6-12 mm; The leveling layer is characterized in that a micro-resistance layer is arranged between the leveling layer and the structural layer, the micro-resistance layer comprises a first micro-resistance layer and a second micro-resistance layer arranged on the first micro-resistance layer, the first micro-resistance layer comprises tiled fine sand, and the second micro-resistance layer comprises at least one layer of tiled film. In one embodiment of the present disclosure, the corrugated tube has a circular cross section, and the number of the steel strands is one bundle. In one embodiment of the disclosure, the second micro-resistive layer comprises at least two layers of tiled films, the films are PE films, each layer of film is formed by abutting a plurality of single films, and abutting seams of the single films of the films of different layers are staggered. In one embodiment of the disclosure, the leveling layer comprises at least two layer bodies arranged at intervals along the horizontal direction, an armor seam is connected between two adjacent layer bodies, and the armor seam comprises two vertical plates which are oppositely arranged. In one embodiment of the disclosure, the steel strand tensioning device further comprises a tensioning end anchor, the tensioning end anchor comprises an anchor backing plate, the anchor backing plate is connected to the vertical plate, a tensioning hole is formed in the vertical plate, and one end of the steel strand is arranged in the tensioning end anchor in a penetrating mode and penetrates through the tensioning hole. In one embodiment of the present disclosure, a horizontal plate extending in a horizontal direction is connected to each of the two vertical plates, and a cover plate is connected to each of the horizontal plates, and covers a gap between the two vertical plates when the cover plate is connected to the horizontal plate. Based on the above purpose, the present disclosure further provides a construction method, which is applied to the post-tensioning method with a bonded prestressed leveling layer structure, and the construction method includes the following steps: treating and repairing the surface of the structural layer; spreading fine sand on the surface of the structural layer to form a first micro-resistance layer; paving at least one layer of film on the first micro-resistance layer to form a second micro-resistance layer; Crisscross arranging the corrugated pipes to form a net shape, and penetrating the steel stranded wires into the corrugated pipes; pouring concrete to form a leveling layer; stretching the steel strand; and grouting the corrugated pipe after tensioning. In one embodiment of the disclosure, in the step of tensioning the steel strand, a method of tensioning the steel strand in multiple times is adopted, when the strength of the concrete reaches more than 10Mpa, the steel st