CN109372518B - Reverse excavation construction method for tunnel abrupt-change section - Google Patents

Reverse excavation construction method for tunnel abrupt-change section Download PDF

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Publication number
CN109372518B
CN109372518B CN201811141440.3A CN201811141440A CN109372518B CN 109372518 B CN109372518 B CN 109372518B CN 201811141440 A CN201811141440 A CN 201811141440A CN 109372518 B CN109372518 B CN 109372518B
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China
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tunnel
construction
change
excavation
abrupt change
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CN201811141440.3A
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CN109372518A (en
Inventor
谭忠盛
周振梁
赵博剑
刘会丰
李林
李扬
陈帅
马新
高晓辉
韩策
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Beijing Municipal Government Construction Group Co Ltd
Beijing Municipal Three Construction Engineering Co Ltd
Beijing Jiaotong University
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Beijing Municipal Government Construction Group Co Ltd
Beijing Municipal Three Construction Engineering Co Ltd
Beijing Jiaotong University
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries

Abstract

The invention relates to a tunnel abrupt change section reverse excavation construction method, which comprises the following specific construction steps: when a main line tunnel is excavated and enters a junction of the double-line tunnel, the section of the tunnel is suddenly changed, the main line span is used as a pilot tunnel to be excavated to the section of the suddenly changed section, and the dense distribution and the reinforcement of an arch frame are carried out at the junction; excavating a pilot tunnel at the abrupt change section by adopting a step method, and spraying concrete; after the pilot tunnel slowly climbs to the design elevation of the abrupt change section, reversely expanding and excavating the pilot tunnel to the design contour of the abrupt change section, and applying the pilot tunnel as an integral primary support; after the design outline excavation of the abrupt change section is finished, constructing an abrupt change section secondary lining, and continuously excavating the long-span tunnel by using the pilot tunnel and the expanded excavation part as upper and middle steps by a step method; the invention aims to reasonably organize tunnel construction procedures of the tunnel abrupt change section, simplify the construction mode of the abrupt change section tunnel, ensure mechanized construction, accelerate the construction progress and improve the construction efficiency on the premise of ensuring the construction safety.

Description

Reverse excavation construction method for tunnel abrupt-change section
The technical field is as follows:
the invention belongs to the technical field of civil engineering construction, and particularly relates to a tunnel abrupt-change section reverse excavation construction method for realizing safe and efficient construction of an ultra-large cross tunnel.
Background art:
along with the demand of economic development in China, highway tunnel engineering is more and more, the following sudden change projects of the tunnel section at the intersection of the double-line tunnel are not rare, and the difficulties of poor stability of surrounding rocks, high construction difficulty and the like at the sudden change section of the tunnel are solved.
The invention content is as follows:
the invention aims to overcome the problems in the prior art, and provides a tunnel abrupt-section reverse excavation construction method which is designed and provided, so that the construction can be organized safely and efficiently by innovating an abrupt-section tunnel excavation method on the premise of ensuring the construction safety, and the construction progress can be ensured.
In order to achieve the aim, the concrete construction steps of the tunnel abrupt change section reverse excavation construction method provided by the invention are carried out as follows:
s1, excavating the main line segment to enter the junction of the super-large span, only performing primary support when the main line segment enters the abrupt change section segment, densely arranging and reinforcing the primary support arch frame, and ensuring the stability of the junction of the abrupt change section segment and the main line segment;
s2, when entering the abrupt change section from the main line tunnel, conducting pilot tunnel climbing construction to the designed elevation of the abrupt change section at an elevation angle of 24 degrees, ensuring the excavation space of large machinery and improving the construction progress;
s3, after the abrupt change section pilot tunnel excavation is finished, reversely expanding excavation is carried out on a reverse expanding excavation area at the upper part of the pilot tunnel until the design size of the abrupt change section, the abrupt change section construction mode divides the large-span tunnel into pilot tunnel construction and expanding excavation construction, surrounding rock pressure is released step by step, and construction risks can be effectively reduced;
s4, after the sudden change section is excavated to the design size, constructing an inverted arch of the section, and then sealing the primary support into a ring to ensure the stability of surrounding rock of the sudden change section;
s5, after the construction of the abrupt change section is completed, because the pilot tunnel is excavated by two steps, an upper step, a middle step and a lower step are formed by the upper step and the lower step during the pilot tunnel excavation and the unexcavated part of the abrupt change interface section, and the long-span tunnel is continuously excavated by a step method;
furthermore, in the invention, the size of the pilot hole in the step S2 is controlled according to the height and span of the main line segment tunnel, and the overlapped part of the pilot hole profile and the design profile of the abrupt change section segment is controlled according to the profile of the abrupt change section segment.
Furthermore, in the pilot tunnel climbing construction of the step S2, the profile is designed by climbing to the abrupt change section at an elevation angle of 24 degrees and advancing the length by 1.5m every cycle, primary spraying support is carried out after excavation is finished, and a section steel arch frame, a reinforcing mesh and concrete are erected at the superposed position of the profile of the pilot tunnel and the abrupt change section to the designed thickness.
Further, in the present invention, the design size of the abrupt change section in step S3 is determined according to the actual working condition, and the preferred range of the design size is 13.0-13.5 m.
Furthermore, the height range of the upper step is 2.5-3.5m, the height range of the middle step is 3.5-4.5m, and the height range of the lower step is 4.0-5.0 m.
Furthermore, when the step S5 of the invention is used for excavating the large span step method, the footage is advanced by 1m every cycle, and the primary support is applied in time after each excavation cycle is finished.
Furthermore, the forward pilot tunnel and the reverse expanding excavation both adopt controlled blasting and carry out manual repair on the tunnel outline.
Compared with the prior art, the invention has the following beneficial effects: in the aspect of construction, the tunnel pilot tunnel of the abrupt change section adopts the size of a main line tunnel, the requirement of large-scale mechanical construction space can be met on the premise of ensuring the construction safety, and the construction efficiency is high; for the sudden-change section tunnel, due to the influence of section sudden change on the integrity of surrounding rocks and the construction risk of the sudden-change section tunnel, the stress of the large-span surrounding rocks is released in a subsection manner by excavating the sudden-change section pilot tunnel and reversely expanding the pilot tunnel, so that the construction risk is greatly reduced, and the safety coefficient is increased.
Description of the drawings:
FIG. 1 is a schematic longitudinal section of a construction route according to the present invention.
The figure is as follows: the device comprises a main line segment 1, a pilot tunnel 2, a reverse expanding excavation area 3, a sudden change section segment 4 and a large span segment 5.
The specific implementation mode is as follows:
the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, the embodiment relates to a tunnel abrupt-change cross-section reverse excavation construction method, and the specific construction steps are performed as follows:
s1, excavating the main line segment 1 to enter the abrupt change section 4, densely arranging and reinforcing an arch frame at the joint of the main line segment and the abrupt change section, measuring and lofting, and ensuring the accuracy of the excavating direction of the pilot tunnel 2 and the contour line of the reverse expanded excavation area 3;
s2, conducting climbing construction on the pilot tunnel 2 at an elevation angle of 24 degrees towards the direction of the abrupt change section 4, controlling the size of the pilot tunnel 2 according to the height and span of the main line segment 1, controlling the superposition position of the excavation outline of the pilot tunnel 2 and the design outline of the abrupt change section 4 by the design outline of the abrupt change section 4, and constructing the pilot tunnel 2 by adopting a step method;
the footage of the pilot tunnel 2 is 1.5m each cycle, a section steel arch is erected at the designed outline of the section 4 excavated to the abrupt change section, the support is primarily sprayed and concrete is sprayed again to the designed thickness, and only the primary spraying support is carried out at the position which does not reach the designed outline;
s3, after excavating the guide tunnel 2 of the abrupt change section 4 to a design elevation, performing reverse expanding excavation area 3; the reverse expanding excavation region 3 is located on the upper portion of the pilot tunnel, the upper portion of the pilot tunnel is located to the designed outline, after excavation is completed, an expanding excavation part primary support is erected in time, controlled blasting is adopted in the reverse expanding excavation region 3, manual repair is conducted on the tunnel outline, and the excavation face is controlled according to the vertical face;
s4, after the section 4 to be suddenly changed is integrally excavated to the designed outline, constructing an inverted arch to integrally seal the tunnel into a ring as soon as possible, and filling the inverted arch to the designed elevation of the road surface;
s5, after the inverted arch of the abrupt change section 4 is formed, lining the main line segment 1 and the abrupt change section 4; and forming an upper step, a middle step and a lower step by using the upper step and the lower step when the pilot tunnel 2 is excavated and the un-excavated part of the abrupt interface section, and continuously excavating the front long-span section 5 tunnel by using a three-step method.

Claims (7)

1. A tunnel abrupt change section reverse excavation construction method is characterized in that: the concrete construction steps are carried out according to the following modes:
s1, excavating the main line segment to enter the junction of the super-large span, only performing primary support when the main line segment enters the abrupt change section segment, densely arranging and reinforcing the primary support arch frame, and ensuring the stability of the junction of the abrupt change section segment and the main line segment;
s2, when entering the abrupt change section from the main line tunnel, conducting pilot tunnel climbing construction to the designed elevation of the abrupt change section at an elevation angle of 24 degrees, ensuring the excavation space of large machinery and improving the construction progress;
s3, after the abrupt change section pilot tunnel excavation is finished, reversely expanding excavation is carried out on a reverse expanding excavation area at the upper part of the pilot tunnel until the design size of the abrupt change section, the abrupt change section construction mode divides the large-span tunnel into pilot tunnel construction and expanding excavation construction, surrounding rock pressure is released step by step, and construction risks can be effectively reduced;
s4, after the sudden change section is excavated to the design size, constructing an inverted arch of the section, and then sealing the primary support into a ring to ensure the stability of surrounding rock of the sudden change section;
s5, after the construction of the abrupt change section is completed, because the pilot tunnel is excavated by two steps, an upper step, a middle step and a lower step are formed by the upper step and the lower step during the pilot tunnel excavation and the unexcavated part of the abrupt change interface section, and the long-span tunnel is excavated by a step method.
2. The tunnel abrupt-change cross-section reverse excavation construction method according to claim 1, characterized in that: and (5) controlling the size of the pilot tunnel in the step (S2) according to the height and span of the main line segment tunnel, and controlling the superposed part of the pilot tunnel profile and the design profile of the abrupt change section segment according to the profile of the abrupt change section segment.
3. The tunnel abrupt-change cross-section reverse excavation construction method according to claim 2, characterized in that: and S2, in the pilot tunnel climbing construction, climbing to the abrupt change section design outline at an elevation angle of 24 degrees and advancing to 1.5m per cycle, performing primary shotcreting support after excavation is finished, and erecting a section steel arch frame, a reinforcing mesh and re-shotcreting concrete at the superposed position of the pilot tunnel and the abrupt change section outline to the design thickness.
4. The tunnel abrupt-change cross-section reverse excavation construction method according to claim 1, characterized in that: the design size of the abrupt change section in the step S3 is determined according to the actual working condition, and the preferred range of the design size is 13.0-13.5 m.
5. The tunnel abrupt-change cross-section reverse excavation construction method according to claim 1, characterized in that: the height range of the middle upper step is 2.5-3.5m, the height range of the middle step is 3.5-4.5m, and the height range of the lower step is 4.0-5.0 m.
6. The tunnel abrupt-change cross-section reverse excavation construction method according to claim 1, characterized in that: step S5, when the large span step method excavation is carried out, the footage is advanced by 1m every cycle, and the preliminary bracing is timely carried out after the excavation cycle is completed.
7. The tunnel abrupt-change cross-section reverse excavation construction method according to claim 1, characterized in that: and the forward pilot tunnel and the reverse expanding excavation adopt controlled blasting and manual repair of the tunnel contour.
CN201811141440.3A 2018-09-28 2018-09-28 Reverse excavation construction method for tunnel abrupt-change section Active CN109372518B (en)

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CN109057807A (en) * 2018-09-28 2018-12-21 北京市市政三建设工程有限责任公司 A kind of gradual change Large span tunnel reversely digs method
CN109751054B (en) * 2019-03-27 2020-06-12 中铁隧道局集团有限公司 Construction method of U-shaped large-section tunnel
CN110924974A (en) * 2019-11-28 2020-03-27 云南省建设投资控股集团有限公司 Construction method of branch tunnel
CN111043926B (en) * 2020-01-03 2020-12-29 重庆中环建设有限公司 400m is realized based on electron detonator2Blasting excavation method for tunnel with large cross section

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JP5449077B2 (en) * 2010-07-29 2014-03-19 西松建設株式会社 Tunnel construction management system
JP2012036624A (en) * 2010-08-06 2012-02-23 Taisei Corp Tunnel construction method
CN103541734B (en) * 2013-11-01 2015-11-25 中铁四局集团有限公司 Under wear literary composition and protect building Tunnel Blasting comprehensive shock-dampening method
CN103775095B (en) * 2014-02-26 2015-10-28 中铁第一勘察设计院集团有限公司 The advanced two pilot tunnel in Ruan Ji tunnel, the mountain ridge and construction method thereof
CN104818991B (en) * 2015-03-30 2016-09-21 中铁二十四局集团福建铁路建设有限公司 A kind of construction method in Shallow-buried residual soil slope tunnel
CN106869944B (en) * 2017-02-14 2018-08-31 中国电建集团华东勘测设计研究院有限公司 The extra small clear-distance tunnel construction method in underground interchange intersection under complex environment
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