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Method for reinforcing electric power tunnel by means of fiber grid enhanced polymer mortar and material

A technology of fiber mesh and power tunnels, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., and can solve problems such as reinforcement failure, fiber cloth is easy to fall off, and steel bars are easy to rust and corrode.

Active Publication Date: 2020-04-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the past, there was a serious problem that steel bars were easy to rust and corrode when reinforced with steel mesh and steel strands.
However, the currently used reinforcement method of pasting fiber cloth, because the tunnel is in a humid environment all the year round, makes the pasted fiber cloth easy to fall off, resulting in complete failure of the reinforcement

Method used

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  • Method for reinforcing electric power tunnel by means of fiber grid enhanced polymer mortar and material
  • Method for reinforcing electric power tunnel by means of fiber grid enhanced polymer mortar and material
  • Method for reinforcing electric power tunnel by means of fiber grid enhanced polymer mortar and material

Examples

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Effect test

Embodiment 1

[0037] The wall of the original inspection shaft was a masonry structure, with bricks and cracks and local cracks of 2-4cm. The basalt fiber mesh is reinforced with polymer mortar. The polymer mortar is composed of Portland cement, polyvinyl acetate emulsion, polyvinyl alcohol fiber, alkali-resistant glass fiber, sand, water, water reducing agent, starch ether, cellulose ether, etc. P·Ⅱ52.5 cement accounts for 22% of the total mass of mortar; polyacetic acid emulsion accounts for 11% of the total mass of mortar; polyvinyl alcohol fiber length 12-15mm, diameter 40-55μm, strength 1700MPa, mass content 0.4%; at the same time The length of alkali-resistant glass fiber is 10-18mm, the diameter is 40-80μm, the tensile strength is 1800MPa, the mass content is 0.5%, the water-cement ratio is 0.44, and the polycarboxylate superplasticizer is 0.15% of the cement mass. Starch ether, cellulose ether, etc. are 0.01% of the cement mass. Sand accounts for 31% of the mortar mass, and the sa...

Embodiment 2

[0039]The original tunnel wall was a reinforced concrete structure, and the steel bars were corroded, the protective layer was cracked, the concrete cracks were 2-3cm, and the concrete protective layer fell off in some places. Reinforced with alkali-resistant glass fiber mesh reinforced water-based epoxy mortar. Epoxy mortar consists of: high belite sulfoaluminate cement, water-based epoxy, polyvinyl alcohol fiber, alkali-resistant glass fiber, sand, water, water reducing agent, starch ether, cellulose ether, etc. High Belite sulfoaluminate cement accounts for 17% of the total mass of mortar; water-based epoxy accounts for 6% of the total mass of mortar; polyvinyl alcohol fiber length 12-15mm, diameter 40-55μm, strength 1700MPa, mass content 0.4% Alkali-resistant glass fiber length 10-18mm, diameter 40-80μm, tensile strength 1800MPa, mass content 0.5%; water-cement ratio 0.42; polycarboxylate superplasticizer 0.15% of cement mass. Starch ether, cellulose ether, etc. are all 0...

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Abstract

The invention discloses a method for reinforcing an electric power tunnel by means of fiber grid enhanced polymer mortar and a material, and belongs to the technical field of fiber grid enhanced cement-based composite material reinforcing. Raw material components comprise cement, polymers, polyvinyl alcohol fibers, alkali-resistant glass fibers, sand, water, a water reducer, starch ether, cellulose ether and the like. The method comprises the steps that pre-repairing such as filling and blocking is conducted on masonry or concrete tunnel wall cracks with the polymer mortar, and the mortar is embedded into the cracks; the surfaces of rusted steel bars are painted with a steel bar corrosion remover, and the tunnel wall is painted with one or two layers of an interface agent; and structural reinforcing is conducted on the tunnel and the well wall through multiple layers of the fiber grid enhanced polymer mortar. In order to improve the anti-seismic overall property, 1-3 fiber rib enhancedconcrete ring beams are arranged; and pretreatment is conducted firstly, and then reinforcing is conducted.

Description

technical field [0001] The invention relates to a method and material for reinforcing power tunnels with fiber grid-reinforced polymer mortar, which belongs to the technical field of fiber grid-reinforced cement-based composite materials and is mainly used for rapid repair and reinforcement of power tunnels. [0002] technical background [0003] In recent years, with the rapid development of urbanization and urban agglomeration in my country, the number of power tunnels is increasing. Underground pipelines such as power tunnels and drainage pipelines are aging or severely damaged due to the increase in service time, endangering the normal use of pipelines and power supply, and the repair of pipelines is becoming increasingly important. Tunnel walls and inspection wells, as important components of underground pipelines, have long been affected by multiple unfavorable factors such as road traffic loads, underground soil pressure, rainwater, and water seepage. Serious problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/00C04B28/04C04B28/06
CPCE21D11/105E21D11/00C04B28/04C04B28/06C04B24/26C04B16/0641C04B14/44C04B14/06C04B2103/302C04B24/38C04B24/383C04B24/281
Inventor 邓宗才
Owner BEIJING UNIV OF TECH
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