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Method and material for strengthening electric tunnel with fiber grid reinforced polymer mortar

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

Active Publication Date: 2021-12-31
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 and material for strengthening electric tunnel with fiber grid reinforced polymer mortar
  • Method and material for strengthening electric tunnel with fiber grid reinforced polymer mortar
  • Method and material for strengthening electric tunnel with fiber grid reinforced polymer mortar

Examples

Experimental program
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Effect test

Embodiment 1

[0041]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 san...

Embodiment 2

[0043] 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 ...

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Abstract

The invention discloses a method and material for reinforcing a power tunnel with fiber grid reinforced polymer mortar, belonging to the technical field of fiber grid reinforced cement-based composite material reinforcement. Raw material components include: cement, polymer, polyvinyl alcohol fiber, alkali-resistant glass fiber, sand, water, water reducing agent, starch ether, cellulose ether, etc. Use the above-mentioned polymer mortar to fill and seal the cracks in the masonry or concrete tunnel wall, so that the mortar can be embedded in the cracks; and paint the surface of the rusted steel bar with a steel preservative, and then paint the interface on the tunnel wall One or two coats; then use multi-layer fiber mesh reinforced polymer mortar to structurally reinforce the tunnel and well walls. In order to improve the seismic integrity, 1‑3 fiber reinforced concrete ring beams are set; pretreatment is carried out first, and then reinforcement is carried out.

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 Patents(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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