A construction method for the lining structure of large-span and large-volume concrete tunnel with circular openings

A technology of mass concrete and construction method, applied in the direction of tunnel lining, tunnel, shaft lining, etc., can solve the problems of reduced section stiffness, reduced shear performance, and impact on structural safety.

Active Publication Date: 2016-02-03
SOUTHWEST JIAOTONG UNIV
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  • Application Information

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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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  • A construction method for the lining structure of large-span and large-volume concrete tunnel with circular openings
  • A construction method for the lining structure of large-span and large-volume concrete tunnel with circular openings

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specific Embodiment approach

[0022] figure 1 , figure 2 It is shown that a specific embodiment of the present invention is: a method for constructing a large-span mass-volume concrete tunnel lining structure with circular openings, which is as follows:

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

[0024] b. Weld the arc-shaped steel pipe 3 on the erecting bar 2A in the lining steel bar 2, and the central axis of the arc-shaped steel pipe 3 coincides with the circumferential axis 1B of the lining 1 above the inverted arch 1A, and the arc-shaped steel pipe 3 along the tunnel Longitudinal equidistant distribution;

[0025] c. Pouring concrete.

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

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Abstract

The invention discloses a construction method of an annually-perforated long-span mass concrete tunnel lining structure. The method includes: a, erecting a formwork and binding lining steel bars (2) at a construction position of a lining (1); b, welding arc-shaped steel pipes (3) on erection bars (2A) in the lining steel bars (2), wherein the central axis of each arc-shaped steel pipe (3) is coincident with an annular axis (1B) of the lining (1) above an inverted arch (1A), and the arc-shaped steel pipes (3) are distributed longitudinally along a tunnel at an equal interval; and c, pouring concrete. The long-span mass concrete tunnel lining structure construction by the method is high in shear capacity and flexural capacity, high in safety and reliability, simple to construct 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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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10
Inventor 张志强师晓权林银李化云阚呈
Owner SOUTHWEST JIAOTONG UNIV
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