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High-performance functionally-gradient shield lining segment and preparation method thereof

A gradient function and lining segment technology, which is applied in wellbore lining, tunnel lining, chemical instruments and methods, etc., can solve the problems of poor durability, easy damage, and high segment cost, and achieve improved carbonation resistance and crack resistance , The effect of reducing the overall damage rate

Inactive Publication Date: 2011-10-05
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the existing reinforced concrete segments, such as easy damage, poor durability, and high cost of preparing segments using high-toughness concrete, the present invention provides a high-performance gradient function shield lining segment

Method used

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  • High-performance functionally-gradient shield lining segment and preparation method thereof
  • High-performance functionally-gradient shield lining segment and preparation method thereof
  • High-performance functionally-gradient shield lining segment and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0036] Conch PII52.5 cement, sheared straight and slightly twisted steel fiber (produced by Jiaxing Jingwei Steel Fiber Co., Ltd.), Class II fly ash, Shagang S95 slag powder, natural medium sand, 5-25mm crushed stone, HG-PCA600 Type high-performance water reducing agent, silica sol with mass concentrations of 5%, 20% and 40% respectively to prepare steel fiber reinforced nano-modified concrete, nano-modified concrete and C50 ordinary concrete, and used for gradient functional shield lining segments Production and concrete mix ratios are shown in Table 1.

[0037] Table 1

[0038]

Embodiment 4～6

[0040] Conch PII52.5 cement, sheared straight and slightly twisted steel fiber (produced by Jiaxing Jingwei Steel Fiber Co., Ltd.), polypropylene emulsion and nylon fiber produced by Zhejiang Luban Building Waterproof Co., Ltd., class II fly ash, and Shagang S95 slag Micropowder, natural medium sand, 5-25mm gravel and HG-FDN type high-efficiency water reducer, white carbon black or nano-SiO 2 The micropowder was used to prepare steel fiber reinforced nano-modified concrete and nano-modified concrete, which were used in the production of functionally gradient shield lining segments. The concrete mix ratios are shown in Table 2, respectively.

[0041] Table 2

[0042]

[0043] Embodiment 4~6:

[0044] Conch PII52.5 cement, sheared straight and slightly twisted steel fiber (produced by Jiaxing Jingwei Steel Fiber Co., Ltd.), polypropylene emulsion produced by Zhejiang Luban Building Waterproof Co., Ltd., class II fly ash, Shagang S95 slag powder, natural Medium sand, 5-25m...

Embodiment 8～10

[0048] Conch PII52.5 cement, sheared straight and slightly twisted steel fiber (produced by Jiaxing Jingwei Steel Fiber Co., Ltd.), Zhejiang Luban polypropylene fiber, class II fly ash, Shagang S95 slag powder, natural medium sand, 5-25mm Crushed stone and HG-PCA600 high-performance water reducing agent are used to prepare steel fiber concrete and ordinary concrete, and are used in the production of gradient functional shield lining segments. The produced gradient functional segments are cured in water for 7-14 days and then hoisted to the segment storage yard. After natural drying for 2 days, 4 days and 5 days respectively, paint 881-H04 epoxy resin coating and JS waterproof coating on the outside of the segments , 881-Y01 type polyurethane waterproof coating and PC-40 type silicone impregnated concrete protective agent, the coating thicknesses are 2.0mm, 4.0mm, 0.3mm respectively. The concrete mix proportions are shown in Table 3.

[0049] table 3

[0050]

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Abstract

The invention discloses a high-performance functionally-gradient shield lining segment and a preparation method thereof. The high-performance functionally-gradient shield lining segment, from top to bottom, sequentially comprises an external nano-modified concrete protection layer, an external nano-modified concrete structure layer, an internal steel fiber reinforced nano-modified concrete toughening structure layer and an internal steel fiber reinforced nano-modified concrete toughening protection layer, wherein the external nano-modified concrete protection layer and the external nano-modified concrete structure layer are connected into a whole; and the internal steel fiber reinforced nano-modified concrete toughening structure layer and the internal steel fiber reinforced nano-modifiedconcrete toughening protection layer are connected into a whole. The invention effectively solves the problems that the existing reinforced concrete segment is easy to damage, poor in durability and low in cost and the like because the existing reinforced concrete segment is completely prepared from high-toughness concrete.

Description

(1) Technical field [0001] The invention relates to a high-performance gradient functional shield lining segment and a preparation method thereof, belonging to the technical field of tunnel engineering materials and products. (2) Background technology [0002] At present, shield method construction has become the main method for constructing underground tunnels, cross-river tunnels and pipeline projects in urban soft soil strata. In the shield method, the tunnel lining structure is assembled from several prefabricated segments, among which the prefabricated concrete segment (hereinafter referred to as the segment) is not only the main structural form of the shield tunnel, but also the comprehensive performance of the tunnel such as waterproof, fire prevention and durability. Therefore, high requirements are put forward for the segment strength, stiffness and durability. [0003] Due to the needs of urban construction, a variety of new shield tunneling technologies have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/08B32B13/02C04B28/00
Inventor 孔德玉姜俊王晓栋
Owner ZHEJIANG UNIV OF TECH
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