Multi-protection system for unbonded prestressed tendons in prefabricated part

Abstract

The utility model discloses an unbonded prestressed tendon multi-protection system in a prefabricated part, which belongs to the field of bridge engineering and comprises the prefabricated part, a prestressed duct, a prestressed tendon, a rubber sleeve and a grouting material. Pre-stress hole channels are reserved in the prefabricated parts in advance; the prefabricated parts are connected by inserting prestressed tendons into prestressed ducts; the rubber sleeve is sleeved on the surface of the prestressed tendon; a grouting material is arranged between the rubber sleeve and the prestressed duct; the grouting material forms a protection, and the rubber sleeve forms another protection. According to the protection system, multiple protection of the unbonded prestressed tendons is achieved, the protection system is convenient to construct and reliable in quality, the anti-corrosion requirement of the unbonded prestressed tendons in the prefabricated parts can be met, and the durability of the prestressed tendons in the prefabricated parts can be guaranteed while the prestressed tendons are not bonded.

Description

Technical Field

[0001] The utility model belongs to the field of bridge engineering, and particularly relates to a multi-protection system of non-bonded prestressed tendons in prefabricated components. Background Art

[0002] Rapid bridge construction technology can realize standardized design, factory prefabrication, mechanized transportation, and assembly construction of bridge construction. It can also combine intelligent and information technology to realize full prefabrication and assembly construction of bridge construction. It has many advantages such as fast on-site construction speed, low interference with the existing environment, high structural construction quality, and high construction safety. It has good economic efficiency after reaching a certain scale and has received widespread attention at home and abroad. Prestressed tendons connected to prefabricated segments to assemble bridge piers is a widely used prefabricated structure type.

[0003] Prefabricated segmental bridge piers connected by unbonded prestressed tendons have good seismic performance, small residual displacement, and can achieve self-reset after an earthquake. However, as an important component of prefabricated segmental bridge piers, unbonded prestressed tendons are susceptible to corrosion in a humid environment, and their durability cannot be guaranteed. Based on the above requirements, this paper proposes a multi-protection system and construction method for unbonded prestressed tendons in prefabricated components. Utility Model Content

[0004] The utility model aims to provide a multi-protection system for non-bonded prestressed tendons in prefabricated components.

[0005] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions:

[0006] A multi-protection system for unbonded prestressed tendons in prefabricated components, comprising prefabricated components, prestressed ducts, prestressed tendons, rubber sleeves, and grouting materials;

[0007] Prestressed channels are reserved in advance in the prefabricated components; the prefabricated components are connected by inserting prestressed tendons into the prestressed channels;

[0008] The rubber sleeve is sleeved on the surface of the prestressed tendon;

[0009] There is grouting material between the rubber sleeve and the prestressed channel;

[0010] The grouting material forms one layer of protection and the rubber sleeve forms another layer of protection.

[0011] Further technology of the utility model:

[0012] Preferably, a gap is left between the rubber sleeve and the prestressed tendons.

[0013] Preferably, epoxy glue is applied to the joints between the prefabricated components, and the prefabricated components and the epoxy glue constitute the first line of protection.

[0014] The beneficial effects of the utility model are:

[0015] The utility model realizes multiple protections of unbonded prestressed tendons, and the protection system thereof is convenient to construct and has reliable quality, and can meet the anti-corrosion requirements of unbonded prestressed tendons in prefabricated components.

[0016] The protection system and construction method of the utility model can ensure the durability of the prestressed tendons in the prefabricated component while achieving non-bonding of the prestressed tendons. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 these drawings without creative work.

[0018] Figure 1 Schematic diagram of the multi-protection system of unbonded prestressed tendons used in prefabricated components

[0019] Figure 2 for Figure 1 AA cross-section diagram

[0020] Figure 3 Construction flow chart of the multiple protection system for unbonded prestressed tendons

[0021] In the figure: 1-prefabricated component, 2-prestressed channel, 3-prestressed tendon, 4-rubber casing, 5-gap, 6-grouting material, 7-epoxy glue. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be further described in detail below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model but not all. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] like Figure 1-2 This embodiment provides a multi-protection system for unbonded prestressed tendons in a prefabricated component, including a prefabricated component 1, a prestressed duct 2, a prestressed tendon 3, a rubber sleeve 4, and a grouting material 6.

[0024] A prestressed channel 2 is reserved in advance in the prefabricated component 1; the prefabricated component 1 is connected by using prestressed tendons 3.

[0025] The rubber sleeve 4 is sleeved on the surface of the prestressed tendon 3 , and a certain gap 5 is left between the rubber sleeve 4 and the prestressed tendon 3 to facilitate the rubber sleeve 4 to be sleeved on the surface of the prestressed tendon 3 .

[0026] There is grouting material 6 between the rubber sleeve 4 and the prestressed channel 2.

[0027] Apply 2-3 mm epoxy glue 7 to the joints between the prefabricated components 1.

[0028] In order to prevent the rubber sleeve 4 from being squeezed and deformed during grouting, the rubber sleeve 4 should have a certain anti-deformation ability.

[0029] like Figure 3 The construction process of the above protection system is as follows:

[0030] 1) In a component factory: prefabricate a prefabricated component 1, reserve a prestressed channel 2 in the prefabricated component 1, and prepare prestressed tendons 3, rubber sleeves 4, and grouting materials 6.

[0031] 2) Install the non-bonded prestressed reinforcement protection device at the construction site: fix the rubber sleeve 4 on the surface of the prestressed reinforcement 3.

[0032] 3) Splicing prefabricated components at the construction site: Fix the prestressed tendons 8 with rubber sleeves 4 so that the prestressed tendons 8 pass through the prestressed holes 2 of the prefabricated components 1. Apply 2-3mm epoxy glue 7 to the joints, and then install the remaining prefabricated components 1 according to the above operations.

[0033] 4) Grouting: After the prefabricated component 1 is installed, grouting material is poured into the prestressed channel 2.

[0034] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A multi-protection system for unbonded prestressed tendons in prefabricated components, characterized in that: It comprises a prefabricated component (1), a prestressed duct (2), a prestressed tendon (3), a rubber sleeve (4), and a grouting material (6); A prestressed channel (2) is reserved in advance in the prefabricated component (1); the prefabricated component (1) is connected by inserting a prestressed tendon (3) into the prestressed channel (2); The rubber sleeve (4) is sleeved on the surface of the prestressed tendon (3); There is grouting material (6) between the rubber sleeve (4) and the prestressed channel (2); The grouting material (6) forms one layer of protection, and the rubber sleeve (4) forms another layer of protection.

2. A multi-protection system for unbonded prestressed tendons in prefabricated components according to claim 1, characterized in that: A gap (5) is left between the rubber sleeve (4) and the prestressed tendon (3).

3. A multi-protection system for unbonded prestressed tendons in prefabricated components according to claim 1, characterized in that: Epoxy glue (7) is applied to the joints between the prefabricated components (1), and the prefabricated components (1) and the epoxy glue (7) constitute the first line of protection.

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