CN103089273B - A kind of longitudinal perforate is greatly across the construction method of concrete in mass tunnel lining structure - Google Patents

A kind of longitudinal perforate is greatly across the construction method of concrete in mass tunnel lining structure Download PDF

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Publication number
CN103089273B
CN103089273B CN201310012726.2A CN201310012726A CN103089273B CN 103089273 B CN103089273 B CN 103089273B CN 201310012726 A CN201310012726 A CN 201310012726A CN 103089273 B CN103089273 B CN 103089273B
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China
Prior art keywords
steel pipe
concrete
lining cutting
lining
greatly
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CN201310012726.2A
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Chinese (zh)
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CN103089273A (en
Inventor
张志强
师晓权
王洋
李化云
阚呈
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西南交通大学
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Priority to CN201310012726.2A priority Critical patent/CN103089273B/en
Publication of CN103089273A publication Critical patent/CN103089273A/en
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Publication of CN103089273B publication Critical patent/CN103089273B/en

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Abstract

The invention discloses a kind of longitudinal perforate greatly across the construction method of concrete in mass tunnel lining structure, its way is: a, at lining cutting (1) construction place formwork erection, colligation lining cutting reinforcing bar (2); B, steel pipe (3) is longitudinally placed on the hoop axis (1B) of inverted arch (1A) above position lining cutting (1), and circumferentially axis (1B) equidistantly distributes, and steel pipe (3) is welded on the bearing rod (2A) in lining cutting reinforcing bar (2); C, concreting.It is large strong across the shearing resistance of concrete in mass tunnel lining structure, bending bearing capacity that the method builds, safety and reliability high, and construction is simple, is easy to promote.

Description

A kind of longitudinal perforate is greatly across the construction method of concrete in mass tunnel lining structure

Technical field

The present invention relates to a kind of greatly across the construction method of concrete in mass tunnel lining structure.

Background technology

Cement can discharge a large amount of heats of hydration in aquation consolidation process.Because concrete is a kind of bad Heat Conduction Material, its inside concrete heat not easily distributes, and can form higher heat of hydration temperature rise.When building greatly across (span reaches 15 ~ 50m) concrete in mass (structure section minimum thickness is at more than 80cm) tunnel lining, the maximum temperature of inside concrete and the difference of outside air temperature are more than 25 DEG C, subsequently in temperature-fall period, be subject to self constraint and external constraint, concrete can not Free Transform, so thermal stresses and restraint stress will be produced at inside concrete, and the tensile strength of early-age concrete is also not full-fledged with other physical properties, the large tensile strength across concrete in mass is lower than thermal stresses, cause producing thermal stresses at inside concrete, time serious, through crack can be produced.

For reducing hydration heat temperature stress to the impact of concrete performance, large across concrete in mass tunnel lining structure in can take the measure of offering hole.Though hole-opening can improve the harmful effect of the heat of hydration, concrete can produce stress at tapping and concentrate and the problem such as rigidity of section reduction and its tension, shear behavior are reduced, and affects the safety of structure; Even if increase arrangement of reinforcement be also difficult to safety and the reliability of guaranteeing structure.

Summary of the invention

The object of the invention is to provide a kind of longitudinal perforate greatly across the construction method of concrete in mass tunnel lining structure.It is large strong across concrete in mass tunnel lining structure tension, shear resistant capacity that the method builds, safety and reliability high, and construction is simple, is easy to promote.

The present invention realizes its goal of the invention, and the technical scheme adopted is: a kind of longitudinal perforate is greatly across the construction method of concrete in mass tunnel lining structure, and its way is:

A, at lining cutting construction place formwork erection, colligation lining cutting reinforcing bar;

B, steel pipe to be longitudinally placed on the hoop axis of inverted arch above position lining cutting, and circumferentially axis equidistantly distributes, and by the bearing rod of steel-pipe welding in lining cutting reinforcing bar;

C, concreting.

Compared with prior art, the invention has the beneficial effects as follows:

Adopt the tunnel lining structure that this method is built, at the equidistant pre-buried longitudinal steel pipe of the hoop axis at the above position of inverted arch, because of the good heat conductivity of steel pipe, temperature transfer rate is fast, and the heat of hydration that concrete produces outwards is dissipated by longitudinal steel pipe rapidly; Produce thermal stresses at inside concrete little, the thermal stresses of early-age concrete, lower than its tensile strength, reduces the generation even avoiding crack.Meanwhile, pre-buried longitudinal steel pipe, as permanent supporting and protection structure, not only facilitates construction, more improves the shear resistance in lining cutting cross section, reduces cross section hole stress concentration effect.

Numerical model test also proves that the tunnel structure that the inventive method is built has good effect:

The present invention and not perforate and the concrete-lined results of numerical model calculation table of longitudinal perforate

Lining cutting section form Time after concrete temperature is stable Shear strength Not perforate concrete lining 28d V The concrete lining of longitudinal perforate cover PVC cylinder 24d 0.75V The present invention's (adding longitudinal concrete filled steel tube lining cutting) 18d 3.66V

(computation model parameter: lining thickness h=1.8m, arranges longitudinal steel pipe (PVC cylinder) along tunnel, adjacent longitudinal steel pipe (PVC cylinder) spacing d=1.2m, diameter of steel tube is D=0.55m, wall thickness t=25mm.)

Upper table shows, compared with longitudinal perforate concrete lining, the shear resistance in lining cutting cross section of the present invention improves about 388%, and rate of heat dispation improves about 21%.This is that the thermal stresses of inside concrete is little because longitudinal steel pipe thermal diffusivity that the present invention is pre-buried is good, reduces the generation even avoiding crack; Meanwhile, after pre-buried longitudinal steel pipe, this be similar to the concrete lining cross section of i-shaped beams integral anti-shearing performance and anti-bending strength significantly improve.

The diameter of above-mentioned steel pipe is 1/10 ~ 1/2 of lining thickness, and the wall thickness of steel pipe is 10 ~ 30mm, and the circumferential distance of adjacent steel pipe is 2 ~ 3 times of diameter of steel tube.

The steel pipe of this specification and spacing well can ensure heat radiation, reduces the generation in crack, strengthens integral anti-shearing performance and the anti-bending strength of lining cutting, meanwhile, also can well control construction cost and investment.

Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.

Accompanying drawing explanation

Fig. 1 is the large cross sectional representation across concrete in mass tunnel lining structure of building by embodiment of the present invention method.

Fig. 2 is the A-A cross-sectional view of Fig. 1.

Detailed description of the invention

Embodiment

Fig. 1, Fig. 2 illustrate, a kind of detailed description of the invention of the present invention is: a kind of longitudinal perforate is greatly across the construction method of concrete in mass tunnel lining structure, and its way is:

A, at lining cutting 1 construction place formwork erection, colligation lining cutting reinforcing bar 2;

B, steel pipe 3 to be longitudinally placed on the hoop axis 1B of inverted arch 1A above position lining cutting 1, and circumferentially axis 1B equidistantly distributes, and steel pipe 3 is welded on the bearing rod 2A in lining cutting reinforcing bar 2;

C, concreting.

The diameter D of the steel pipe 3 that this example uses is 1/10 ~ 1/2 of lining thickness h, and the wall thickness t of steel pipe 3 is 10 ~ 30mm, and the circumferential distance d of adjacent steel pipe 3 is 2 ~ 3 times of steel pipe 3 diameter D.

Claims (1)

1. longitudinal perforate is greatly across a construction method for concrete in mass tunnel lining structure, and its way is:
A, at lining cutting (1) construction place formwork erection, colligation lining cutting reinforcing bar (2);
B, steel pipe (3) is longitudinally placed on the hoop axis (1B) of inverted arch (1A) above position lining cutting (1), and circumferentially axis (1B) equidistantly distributes, and steel pipe (3) is welded on the bearing rod (2A) in lining cutting reinforcing bar (2);
The diameter (D) of described steel pipe (3) is lining thickness (h) 1/10 ~ 1/2, the wall thickness (t) of steel pipe (3) is 10 ~ 30mm, 2 ~ 3 times that the circumferential distance (d) of adjacent steel pipe (3) is steel pipe (3) diameter (D);
C, concreting.
CN201310012726.2A 2013-01-14 2013-01-14 A kind of longitudinal perforate is greatly across the construction method of concrete in mass tunnel lining structure CN103089273B (en)

Priority Applications (1)

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CN201310012726.2A CN103089273B (en) 2013-01-14 2013-01-14 A kind of longitudinal perforate is greatly across the construction method of concrete in mass tunnel lining structure

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Application Number Priority Date Filing Date Title
CN201310012726.2A CN103089273B (en) 2013-01-14 2013-01-14 A kind of longitudinal perforate is greatly across the construction method of concrete in mass tunnel lining structure

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101614125A (en) * 2009-07-23 2009-12-30 中铁九局集团有限公司 V level surrounding rock tunnel job practices
CN102287196A (en) * 2011-06-29 2011-12-21 大连市市政设计研究院有限责任公司 Method for designing long-distance small-spacing tunnel
CN102733827A (en) * 2012-06-29 2012-10-17 湖南省交通规划勘察设计院 Tunnel arch exchanging construction method and construction structure in tunnel arch exchanging construction

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Publication number Priority date Publication date Assignee Title
JP2007224570A (en) * 2006-02-22 2007-09-06 Ohbayashi Corp Shield lining segment, shield lining structure, and method of constructing shield lining structure
CN101413304B (en) * 2008-12-11 2010-06-23 中建二局第三建筑工程有限公司 Cast-in-situ concrete hollow exterior wall and construction method thereof
CN102410029A (en) * 2011-12-30 2012-04-11 中铁二院工程集团有限责任公司 Mass hollow concrete tunnel lining structure
CN202577761U (en) * 2012-04-17 2012-12-05 广州市第一建筑工程有限公司 Compound large-section concrete filled steel tube column

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101614125A (en) * 2009-07-23 2009-12-30 中铁九局集团有限公司 V level surrounding rock tunnel job practices
CN102287196A (en) * 2011-06-29 2011-12-21 大连市市政设计研究院有限责任公司 Method for designing long-distance small-spacing tunnel
CN102733827A (en) * 2012-06-29 2012-10-17 湖南省交通规划勘察设计院 Tunnel arch exchanging construction method and construction structure in tunnel arch exchanging construction

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
公路大跨度隧道开挖及初期支护施工;张凯;《隧道建设》;20070820;第27卷(第4期);第65-68页 *

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