CN102182469A - Construction method for preventing cracking of second lining of middle cavity of large span tunnel - Google Patents

Construction method for preventing cracking of second lining of middle cavity of large span tunnel Download PDF

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Publication number
CN102182469A
CN102182469A CN2011101140867A CN201110114086A CN102182469A CN 102182469 A CN102182469 A CN 102182469A CN 2011101140867 A CN2011101140867 A CN 2011101140867A CN 201110114086 A CN201110114086 A CN 201110114086A CN 102182469 A CN102182469 A CN 102182469A
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China
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lining
construction
tunnel
cavity
cavern
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CN2011101140867A
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CN102182469B (en
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辛振省
张俊兵
郑保才
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China Railway No 3 Engineering Group Co Ltd
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China Railway No 3 Engineering Group Co Ltd
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Abstract

The invention belongs to the technical field of advanced second lining construction of an undermined multi-arch tunnel, and in particular relates to a construction method for preventing the cracking of a second lining of a middle cavity of a large span tunnel. The problem that side cavity excavation is easy to cause the second lining of a middle cavity vault to crack in the traditional tunnel construction is solved. The construction method comprises the following steps of: constructing the middle cavity, preserving stabilizer bar holes on an upper longitudinal beam of the middle cavity, erecting supporting steel tubes between symmetrical stabilizer bar holes, penetrating screwed steel bars into the stabilizer bar holes and the supporting steel tubes at the same time, and tightening end nuts in time to form a stable tension stabilizing structure; and excavating side cavities on both sides and lining the side cavities in time to form a multi-arch tunnel structure. The construction method is simple and easy to operate, the construction cost is low, tension screws and the supporting steel tubes can be reused, economic benefits and social benefits in present large-scale underground projects, especially in a large span tunnel construction field, are particularly outstanding, the meaning is profound and lasting, and the construction method has an extremely high popularization value.

Description

A kind of job practices of striding secondary lining anti-cracking in hole in the tunnel greatly
Technical field
The invention belongs to the multi-joint arch of the tunneling tunnel technical field of the construction of secondary lining in advance, be specifically related to a kind of job practices of striding secondary lining anti-cracking in hole in the tunnel greatly.
Background technology
Along with the further propelling of Increase of population and urbanization, quick follow-up is demanded in traffic urgently, and ground resource is limited, tunnel construction become transport solution particularly the means of very wanting most of urban traffic developed on an unprecedented scale and used.Development along with tunneling technique, the tunnel is gradually to big section, large section development, in the process of big section and large section tunnel construction, bore quick-fried tunneling support technology at present and mainly adopt connection arch scheme, promptly a big section is divided into a plurality of arches and excavates and supporting, to keep the stable of excavation face and country rock.Through calculating comparative analysis, earlier the middle hole method that the hole secondary lining excavates the cavern, both sides then in cavern and the cast in advance in the middle of the excavation all is more reasonable on mechanical characteristics and construction technology, so middle hole method is widely used in the excavation design and construction process of large cross-section tunnel.Vault secondary lining cracking is a ubiquitous problem in the method work progress of middle instantly hole when excavating the cavern, both sides after middle hole vault secondary lining applies and finishes, and also is the significant problem that directly influences tunnel safety and quality, never is well solved.
At present; in in the hole method work progress, middle hole vault secondary lining resist technology mainly adopts at middle hole vault secondary lining and applies reserved steel bar head in the process, side is wide open dig before; with the reinforcing bar of making the steel bar end of reserving is coupled together, play the tension lining cutting and prevent its effect to outer displacement.This method has limited the lining cutting displacement to a certain extent, and vault lining cutting cracking in hole in preventing is played a role.But facts have proved that this method has only limited the export-oriented displacement of lining cutting to both sides, the not displacement to the inside of restriction restriction lining cutting, so after reinforcing in this way, hole vault secondary lining still can ftracture in the wide open process of digging of side, and similar accident happens occasionally in actual engineering.
Summary of the invention
The present invention is in order to solve in the existing multi-joint arch constructing tunnel of the tunneling process, and the wide open process of digging of side easily causes the problem of the middle hole vault secondary lining cracking that has applied, and a kind of job practices of striding secondary lining anti-cracking in hole in the tunnel greatly is provided.
The present invention adopts following technical scheme to realize:
Stride the job practices of secondary lining anti-cracking in hole in the tunnel greatly, its step is as follows:
1), carry out in the middle of the cavern excavation and carry out the preliminary bracing layer and the interim construction of supporting of grid steelframe, the interim support of grid comprises vertical grid steelframe and horizontal grid steelframe;
2), apply inverted arch secondary lining and bottom longeron in the bottom of middle cavern;
3), on the longeron of bottom steel pipe column is installed, the vault secondary lining and the top longeron of cavern in the middle of applying are then reserved the stabiliser bar duct on the two top longerons between the adjacent steel tubing string, and the stabiliser bar duct on the two top longerons is with respect to the tunnel axis symmetry;
4), remove the below of vertical grid steelframe top to the top longeron, between the stabiliser bar duct of symmetry, set up supporting steel pipe, in stabiliser bar duct and supporting steel pipe, penetrate simultaneously the screw rod reinforcing bar and in time tighten the termination nut, form stable tension and compression rock-steady structure;
5), apply intermediate laminae;
6), the side cavern and the lining cutting in time of excavation both sides, form connection arch tunnel structure.
Beneficial effect of the present invention: vault secondary lining reserving hole channel in middle cavern; utilize screw rod and supporting steel pipe to make steel pipe column and vault secondary lining form rock-steady structure then; guarantee that in later stage intermediate laminae and side cavern work progress the vault secondary lining is not subjected to pulling force and pressure effect; the quality of effectively protection vault lining cutting, and assurance lining cutting.This method is simple to operation, and is cheap, and pulling force screw rod and supporting steel pipe can reuse, current extensive underground construction particularly stride its economic benefit of tunnel construction field greatly and social benefit particularly outstanding, of far-reaching significance, high promotional value is arranged.
Description of drawings
Fig. 1 is wide open digging and the schematic diagram of preliminary bracing in being
Fig. 2 applies the schematic diagram on inverted arch secondary lining and longeron basis, bottom for the bottom
Fig. 3 is the schematic diagram of construction steel pipe column, vault secondary lining and top longeron
Fig. 4 is the schematic diagram of secondary lining tension and compression rock-steady structure
Fig. 5 is the vertical view of secondary lining tension and compression rock-steady structure
Fig. 6 is the schematic diagram of half storey in the middle of applying
Fig. 7 encircles the schematic diagram of tunnel structure for the connection that forms
Among the figure: 1-preliminary bracing layer, the vertical grid steelframe of 2-, the horizontal grid steelframe of 3-, 4-inverted arch secondary lining, 5-bottom longeron, 6-steel pipe column, 7-vault secondary lining, 8-top longeron, 9-stabiliser bar duct, 10-supporting steel pipe, 11-screw rod reinforcing bar, the 12-intermediate laminae, cavern in the middle of the 13-, 14-side cavern.
The specific embodiment
In conjunction with the accompanying drawings the specific embodiment of the present invention is described further.
The new technology of hole vault secondary lining protection in The present invention be directed in the multi-joint arch constructing tunnel of big section or the large section process, its specific implementation method is:
1, carry out in the middle of cavern 13 excavation and carry out preliminary bracing, as shown in Figure 1.
2, the bottom applies inverted arch secondary lining 4 and bottom longeron 5, and guarantees that vertical grid steelframe 2 embeds inverted arch secondary lining 4 and is not less than 10cm.As shown in Figure 2.
3, steel pipe column 6 is installed on bottom longeron 5, and the vault secondary lining 7 and the top longeron 8 of cavern 13 in the middle of applying, and on the top longeron 8 of vault secondary lining 7 bottoms, reserve stabiliser bar duct 9, remove to top longeron 8 belows, as shown in Figure 3 on simultaneously vertical grid steelframe 2 tops.
4, in time in the middle of two upper lateral part longerons 8 of vault secondary lining 7 bottoms of middle cavern 13, set up heavy wall supporting steel pipes 10, in stabiliser bar duct 9 and Qi Nei heavy wall supporting steel pipe 10, penetrate simultaneously screw rod reinforcing bar 11 and in time tighten the termination nut, form stable tension and compression rock-steady structure, as Fig. 4, shown in Figure 5.
5, apply intermediate laminae 12, as shown in Figure 6.
6, the side cavern 14 of excavation both sides and lining cutting in time, the final connection arch tunnel structure that forms, as shown in Figure 7.

Claims (1)

1. stride the secondary lining anti-job practices that ftractures in hole in the tunnel greatly for one kind, it is characterized in that step is as follows:
1), carry out in the middle of cavern (13) excavation and carry out the interim construction of supporting of preliminary bracing layer (1) and grid steelframe, the interim support of grid comprises vertical grid steelframe (2) and horizontal grid steelframe (3);
2), apply inverted arch secondary lining (4) and bottom longeron (5) in the bottom of middle cavern (13);
3), go up installation steel pipe column (6) at bottom longeron (5), the vault secondary lining (7) and the top longeron (8) of cavern (13) in the middle of applying then, two top longerons (8) between the adjacent steel tubing string (6) are gone up and are reserved stabiliser bar duct (9), and the stabiliser bar duct (9) on the two top longerons (8) is with respect to the tunnel axis symmetry;
4), remove the below of vertical grid steelframe (2) top to top longeron (8), between the stabiliser bar duct (9) of symmetry, set up supporting steel pipe (10), in stabiliser bar duct (9) and supporting steel pipe (10), penetrate simultaneously screw rod reinforcing bar (11) and in time tighten the termination nut, form stable tension and compression rock-steady structure;
5), apply intermediate laminae (12);
6), the side cavern (14) and the lining cutting in time of excavation both sides, form connection arch tunnel structure.
CN 201110114086 2011-05-04 2011-05-04 Construction method for preventing cracking of second lining of middle cavity of large span tunnel Active CN102182469B (en)

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CN 201110114086 CN102182469B (en) 2011-05-04 2011-05-04 Construction method for preventing cracking of second lining of middle cavity of large span tunnel

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CN102182469B CN102182469B (en) 2013-07-24

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104453948A (en) * 2014-12-01 2015-03-25 中铁隆工程集团有限公司 Vertical prestress steel pipe supporting structure for large-section subsurface tunnel and construction process
CN106640126A (en) * 2016-10-11 2017-05-10 中铁隧道集团有限公司 Processing method for extremely-high geostress soft rock tunnel arch wall lining cracking damage
CN111322088A (en) * 2020-02-27 2020-06-23 济南市市政工程设计研究院(集团)有限责任公司 Construction method for realizing combined primary support load sharing
CN111365042A (en) * 2020-03-13 2020-07-03 重庆工程职业技术学院 Large-section tunnel supporting device

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KR20100003061A (en) * 2008-06-30 2010-01-07 (주)엘티엠 Tunneling method and apparatus for blasting of enlargement and construction of concrete lining carried out simultaneously during excavation of pilot tunnel by tbm
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CN101725358A (en) * 2008-10-31 2010-06-09 中铁四局集团有限公司 Excavation construction method of ultra-shallow buried uneven weathered stratum of tunnel
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104453948A (en) * 2014-12-01 2015-03-25 中铁隆工程集团有限公司 Vertical prestress steel pipe supporting structure for large-section subsurface tunnel and construction process
CN104453948B (en) * 2014-12-01 2016-10-12 中铁隆工程集团有限公司 A kind of construction technology of big cross section bored tunnel vertical prestressing steel pipe support
CN106640126A (en) * 2016-10-11 2017-05-10 中铁隧道集团有限公司 Processing method for extremely-high geostress soft rock tunnel arch wall lining cracking damage
CN111322088A (en) * 2020-02-27 2020-06-23 济南市市政工程设计研究院(集团)有限责任公司 Construction method for realizing combined primary support load sharing
CN111365042A (en) * 2020-03-13 2020-07-03 重庆工程职业技术学院 Large-section tunnel supporting device

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