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Tunnel lining segment and preparation method thereof

A technology for lining segments and tunnels, used in tunnel linings, tunnels, shaft linings, etc., can solve the problems of concrete segment bursting, overall structure damage, and high cost, preventing concrete bursting, eliminating test errors, and improving fire resistance. Effect

Inactive Publication Date: 2009-09-30
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in engineering practice, the defects of reinforced concrete segments have gradually emerged
Mainly include: 1) It is easy to be damaged and cracked, which will damage the integrity of the lining structure, cause leakage and corrosion, and adversely affect the safety and durability of the tunnel structure. issues that must be properly addressed
2) The fire resistance is poor. The traditional reinforced concrete segment does not consider the fire factor. Once a fire occurs, the concrete segment is prone to burst, exposing the internal steel bars, which may damage the local or even the overall structure.
3) Lack of self-diagnosis function, lack of self-diagnosis ability for internal temperature, deformation, stress and durability conditions during construction and operation
However, this method is not only costly and complicated, but also has a short service life of the sensor, which cannot meet the requirements of long-term health monitoring.

Method used

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  • Tunnel lining segment and preparation method thereof
  • Tunnel lining segment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 Preparation and calibration of carbon fiber cement-based sensor

[0043] Carbon fiber mortars with carbon fiber volume additions of 0.2%, 0.3% and 0.5% were prepared.

[0044] Carbon fiber mortar preparation method: Pour the weighed chopped carbon fiber (carbon fiber length is 5-10mm) into the stirring device, add water and methyl cellulose and stir evenly, then slowly add silica fume, cement, yellow sand and defoamer Finally, slowly add high-efficiency superplasticizer to adjust the fluidity, and stir for 3 minutes. Then into the mold vibration molding.

[0045] The ratio (mass ratio) of the cement-based material is: cement: silica fume: yellow sand: water: methylcellulose: defoamer: superplasticizer = 1:0.15:1:0.4:0.0006:0.001:0.005. The defoamer is an industrial aliphatic hydrocarbon surfactant, and the high-efficiency water reducer is a polycarboxylic acid superplasticizer.

[0046] The size of the sensor is 5cm×5cm×5cm, and the test strength level i...

Embodiment 2

[0050] Example 2 Preparation of Tunnel Lining Segments

[0051] Select polypropylene fibers that meet the following conditions:

[0052] The length is 12-18mm, the average diameter is 60 microns, the elongation is greater than 15%, the tensile strength is greater than 500MPa, the elastic modulus is 3.0-5.0GPa, and the density is 0.91g / cm 3 , the melting point is lower than 170°C.

[0053] The volume content of polypropylene fiber is selected as 0.05%, 0.1%, and 0.2%, respectively.

[0054] Other raw materials for concrete include ordinary Portland cement with a strength grade of 42.5; finely ground slag of S95 and above; medium sand; and limestone with a maximum particle size of less than 25mm. High-efficiency water-reducing agent with a water-reducing rate higher than 30%. Calculate the concrete mix ratio according to the strength design requirements, then weigh the raw materials according to the calculation requirements, add water and stir them evenly, and then pour them ...

Embodiment 3

[0062] Example 3 Preparation of Tunnel Lining Segments

[0063] The preparation steps are the same as in Example 2, wherein the pouring range of polypropylene fiber concrete is the thickness range of 5 cm inside, and the other thickness ranges are poured with ordinary concrete.

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Abstract

The invention relates to a tunnel lining segment and a preparation method thereof. The invention provides a tunnel lining segment with the functions of anti-seepage, crack resistance and fire resistance and a preparation method thereof. The tunnel lining segment provided by the present invention is a concrete segment, the concrete inside the segment is polypropylene fiber concrete, the volume content of polypropylene fiber is 0.05-0.2%, and the thickness of the inner polypropylene fiber concrete layer is not less than 5 cm, the outer side of the polypropylene fiber concrete layer is ordinary concrete. The invention overcomes the defects of single function, non-refractory and easy cracking of the conventional tunnel segment, and improves the safety of the tunnel structure.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and in particular relates to a tunnel lining segment and a preparation method thereof. Background technique [0002] A shield tunnel is a tunnel lining structure assembled from several prefabricated segments, and the tunnel lining cost often accounts for about 40% to 50% of the entire tunnel engineering cost. Therefore, the quality of the segment directly affects the structural safety of the tunnel. Reinforced concrete segment is the most widely used form of tunnel lining. Reinforced concrete segments have a certain strength and are relatively easy to manufacture. Steel molds can ensure segment accuracy and low cost, especially in China. [0003] However, in engineering practice, the defects of reinforced concrete segments are gradually emerging. Mainly include: 1) It is easy to be damaged and cracked, which will damage the integrity of the lining structure, cause leakage a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/08C04B16/06C04B28/00
Inventor 姚武
Owner TONGJI UNIV
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