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Ultra-high performance hybrid fiber concrete shield segment and preparation method thereof

A hybrid fiber and ultra-high-performance technology, which is applied in earth cube drilling, mining equipment, shaft equipment, etc., can solve the problems of concrete protective layer bursting, uneven heat distribution, and water vapor cannot be discharged, etc., and achieves short steam curing time , reduce production time, and reduce energy consumption

Inactive Publication Date: 2015-11-11
CHINA STATE CONSTRUCTION ENGINEERING CORPORATION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Since the reinforced concrete segment is mostly made of high-strength concrete above C50, the concrete is brittle and has poor toughness. During the transportation and installation of the segment, the edges and joints are easily damaged, which affects its durability;
[0005] 2. There are more reinforcements in reinforced concrete segments, and a large amount of steel bars are used;
[0006] 3. The amount of concrete is large, and the segments are self-heavy;
[0008] 5. High-strength concrete is good for durability, but it has a disadvantage for the fire protection of tunnels. Once a fire breaks out in the tunnel, the dense concrete will make it impossible for the internal water vapor to escape, and the heat distribution will be uneven, resulting in Burst of concrete cover

Method used

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  • Ultra-high performance hybrid fiber concrete shield segment and preparation method thereof
  • Ultra-high performance hybrid fiber concrete shield segment and preparation method thereof
  • Ultra-high performance hybrid fiber concrete shield segment and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0056] 1. Processing of steel skeleton:

[0057] The segment standard block has a width of 2000mm, a thickness of 315mm, and an inner arc length of 3492mm. Compared with the traditional reinforced concrete segment (width of 2000mm, thickness of 380mm, and inner arc length of 3492mm), the thickness is reduced by 17%, the volume is reduced by 18%, and the amount of main reinforcement 1 167kg, the reinforcement ratio is 0.83%, which is 21% less than the traditional one, and the amount of distributed reinforcement 2 is 39kg, which is 60% less than the traditional one.

[0058] 2. Mixing of ultra-high performance hybrid fiber concrete:

[0059] For cementitious materials, the total addition amount is 100 parts, of which the addition amount of ordinary Portland cement accounts for 75% of the total, secondary fly ash is 18.5%, and silica fume is 6.5%;

[0060] Manufactured sand, Zone II, fineness modulus 2.7, mud content less than 2%, and the addition amount is 135 parts;

[0061] ...

Embodiment 2

[0071] 1. Processing of steel skeleton:

[0072] The segment standard block has a width of 1000mm, a thickness of 225mm, and an inner arc length of 1746mm. Compared with the traditional reinforced concrete segment (width of 1000mm, thickness of 270mm, and inner arc length of 1746mm), the thickness is reduced by 17%, the volume is reduced by 18%, and the amount of main reinforcement 1 28kg, the reinforcement ratio is 0.85%, which is 17% less than the traditional one, and the distributed reinforcement 2 dosage is 9kg, which is 50% less than the traditional one.

[0073] 2. Mixing of ultra-high performance hybrid fiber concrete:

[0074] For cementitious materials, the total addition amount is 24%, of which ordinary portland cement is 75%, secondary fly ash is 18.5%, and silica fume is 6.5%;

[0075] Manufactured sand, Zone II, fineness modulus 3.0, mud content less than 2%, admixture of 140 parts;

[0076] Crushed stone, graded crushed stone with a diameter of less than 20mm, ...

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Abstract

The invention discloses an ultra-high performance hybrid fiber concrete shield segment and a preparation method thereof. The ultra-high performance hybrid fiber concrete shield segment is of a reinforced concrete structure which consists of a steel skeleton and concrete, wherein the reinforcement ratio of used main reinforcements is 0.5%-1.0%, the distances of the main reinforcements are 150-300mm, the grades of steel reinforcements are not less than three, the smallest steel reinforcement distance of distributed reinforcements is 400mm, the biggest steel reinforcement distance of used distributed reinforcements is 2000mm, and the grades of the steel reinforcements are not less than two. The ultra-high performance hybrid fiber concrete shield segment is made from ultra-high performance hybrid fiber concrete, and comprises cementitious materials, sands, crushed stones, steel fibers, synthetic fibers, water reducer, defoamer and water. The ultra-high performance hybrid fiber concrete shield segment is less in dosage of the steel reinforcements and concrete and high in early strength, can prevent steam preservation, reduces energy consumption, and is green, energy-saving and environmentally friendly. The ultra-high performance hybrid fiber concrete shield segment is strong in anti-burst performance when having a fire, excellent in toughness and crack resistance and excellent in durability, enables edge joints not to easily break, and overcomes the defects of traditional segments.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction, and specifically refers to an ultra-high performance hybrid fiber concrete shield segment and a preparation method thereof. Background technique [0002] With the continuous development of the scale of urban construction, major cities in China have successively begun to develop subways and urban underground spaces and transform urban water conservancy systems. The shield method construction technology is a construction method that has been widely used in underground tunnel construction. The prefabricated shield segment is the main assembly component of the shield construction, and it is the outermost permanent lining structure of the tunnel, which bears the role of resisting soil pressure, groundwater pressure and some special loads. [0003] As the main body of the tunnel structure, the prefabricated shield segment is directly related to the overall quality of the tunnel, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/08C04B28/00C04B28/04C04B14/38C04B16/06
Inventor 石云兴倪坤张发盛刘新伟张燕刚王庆轩
Owner CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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