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Construction method of longitudinal opening long-span large-volume concrete tunnel lining structure

A mass concrete and construction method technology, applied in tunnel lining, tunnel, shaft lining, etc., can solve problems affecting structural safety, difficulty in ensuring structural safety and reliability, and reduced section rigidity

Active Publication Date: 2013-05-08
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although opening holes can improve the adverse effects of heat of hydration, problems such as stress concentration and section stiffness reduction will occur in the openings of the concrete, which will reduce its tensile and shear resistance and affect the safety of the structure; even if the reinforcement is increased It is also difficult to ensure the safety and reliability of the structure

Method used

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  • Construction method of longitudinal opening long-span large-volume concrete tunnel lining structure
  • Construction method of longitudinal opening long-span large-volume concrete tunnel lining structure

Examples

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specific Embodiment approach

[0022] figure 1 , figure 2 Shown, a kind of specific embodiment of the present invention is: a kind of construction method of long-span mass concrete tunnel lining structure with longitudinal opening, and its method is:

[0023] a. Set up the formwork at the construction site of the lining 1 and bind the lining reinforcement 2;

[0024] b. Place the steel pipes 3 longitudinally on the circumferential axis 1B of the lining 1 above the inverted arch 1A, and distribute them at equal intervals along the circumferential axis 1B, and weld the steel pipes 3 to the erecting bars 2A of the lining steel bars 2;

[0025] c. Pouring concrete.

[0026] The diameter D of the steel pipe 3 used in this example is 1 / 10 to 1 / 2 of the lining thickness h, the wall thickness t of the steel pipe 3 is 10 to 30 mm, and the circumferential distance d between adjacent steel pipes 3 is 2 to 1 / 2 of the diameter D of the steel pipe 3. 3 times.

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Abstract

The invention discloses a construction method of longitudinal opening long-span large-volume concrete tunnel lining structure. The method includes the following steps: a, erecting formworks at a construction position of lining (1) and colligating lining rebars (2), b, longitudinally placing steel pipes (3) on a circumferential axis (1B) of the lining (1) at an upper portion of an inverted arch (1A), the steel pipes are distributed with the same distance, and welding the steel pipes (3) on frame supporting ribs (2A) in the colligating lining rebars (2), c, concreting. The method has the advantages of that the long-span large-volume concrete tunnel lining structure is strong in shearing resistance and bending resistance carrying capacity, high in safety and reliability, simple in construction, and easy to popularize.

Description

technical field [0001] The invention relates to a construction method of a large-span and large-volume concrete tunnel lining structure. Background technique [0002] Cement releases a large amount of heat of hydration during hydration and consolidation. Since concrete is a poor heat-conducting material, the internal heat of the concrete is not easy to dissipate, which will form a high temperature rise of the heat of hydration. When constructing long-span (span up to 15-50m) mass concrete (minimum thickness of structural section above 80cm) tunnel lining, the difference between the highest temperature inside the concrete and the outside air temperature exceeds 25°C, and then during the cooling process, it is subject to self-constraints And external constraints, concrete cannot be freely deformed, so temperature stress and restraint stress will be generated inside the concrete, while the tensile strength and other physical properties of early-age concrete have not yet mature...

Claims

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Application Information

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IPC IPC(8): E21D11/10
Inventor 张志强师晓权王洋李化云阚呈
Owner SOUTHWEST JIAOTONG UNIV
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