CN107605490B - Single hole large cross-section tunnel double side wall construction conversion process - Google Patents

Single hole large cross-section tunnel double side wall construction conversion process Download PDF

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Publication number
CN107605490B
CN107605490B CN201710748122.2A CN201710748122A CN107605490B CN 107605490 B CN107605490 B CN 107605490B CN 201710748122 A CN201710748122 A CN 201710748122A CN 107605490 B CN107605490 B CN 107605490B
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double
tunnel
predicament
supporting
embarrassing situation
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CN107605490A (en
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刘毅
石磊
董汉军
张勇
康晓平
彭振
肖飞
贺祖浩
李向阳
张志强
赵才
郭真
徐少红
石福龙
冯德定
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CCCC Second Harbor Engineering Co
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CCCC Second Harbor Engineering Co
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Abstract

The invention discloses a kind of single hole large cross-section tunnel double side wall construction conversion process, include the following steps:The first step:Mid-board is moved to the left, interim inverted arch moves overlapped with the mid-board of CRD, interim inverted arch gradually downward on the left of double side wall tunnel;Second step:Base tunnel top bar at left and right sides of double side wall is got out of a predicament or an embarrassing situation and middle part top bar excavation supporting, and reserved middle part is got out of a predicament or an embarrassing situation Core Soil;Third walks:Light section benching tunnelling method top bar, excavation supporting of getting out of a predicament or an embarrassing situation;4th step:Top bar at left and right sides of middle section CRD, right side are got out of a predicament or an embarrassing situation excavation supporting;5th step:It gets out of a predicament or an embarrassing situation in the middle part of double side wall excavation supporting, excavation supporting of getting out of a predicament or an embarrassing situation on the right side of CRD.The present invention is combined and is constructed using the movement of two side-wall pilot tunnel mid-board and remaining core soil in advance, is ensured that construction safety is convenient, is reduced cost, it accelerates construction progress, arrangement and method for construction adjustment flexibility is big, and surrouding rock deformation hardly develops, and disclosure satisfy that the project construction stringent to deformation requirements.

Description

Single hole large cross-section tunnel double side wall construction conversion process
Technical field
The present invention relates to vcehicular tunnel, city underground engineering technical field more particularly to a kind of single hole large cross-section tunnel are double Side wall construction conversion process.
Background technology
With the continuous development of urban rail transit in China, the construction of subway enters a peak period.In new and old tunnel Linkage section and other specific conditions under, the case where large cross-section tunnel is converted to double-hole tunnel can be encountered.Due to tunnel cross-section Difference, there is some difference for lining style, supporting parameter and excavation method, determines that constructing tunnel faces engineering method conversion in the process The case where.Since section size differs greatly with design of its support, in the case where not removing temporary support, construction is inconvenient, such as goes out Slag can only be carried out manually with charging.It needs one kind under the premise of not removing temporary support, ensures construction safety and continuous new Technique, engineering method.
Invention content
In order to overcome the problems referred above, it constructs conversion process the present invention provides a kind of single hole large cross-section tunnel double side wall, it can be with In the case where not removing temporary support, completes single hole large cross-section tunnel and converted to double hole CRD and benching tunnelling method.
The technical solution adopted by the present invention is:
Single hole large cross-section tunnel double side wall construction conversion process, includes the following steps:
The first step:Mid-board is moved to the left on the left of large cross-section tunnel double side wall overlaps with CRD mid-boards, leaves office on double side wall The interim inverted arch of rank is moved down to be moved to the interim inverted arch of CRD up/down steps and be overlapped;
Second step:Base tunnel top bar, excavation supporting of getting out of a predicament or an embarrassing situation on the right side of double side wall, double side wall left side base tunnel top bar are left office Rank excavation supporting, double side wall middle part top bar excavation supporting, reserves Core Soil of getting out of a predicament or an embarrassing situation in the middle part of double side wall;
Third walks:Light section benching tunnelling method top bar, excavation supporting of getting out of a predicament or an embarrassing situation;
4th step:Top bar, excavation supporting of getting out of a predicament or an embarrassing situation on the left of middle section CRD, the right sides CRD top bar excavation supporting;
5th step:It gets out of a predicament or an embarrassing situation in the middle part of double side wall Core Soil excavation supporting, excavation supporting of getting out of a predicament or an embarrassing situation on the right side of CRD.
A distance starts to construct in face of double side wall tunnel excavation to tunnel conversion in the first step, while During Initial Stage Construction Supporting and temporary supporting system installation.
The preliminary bracing includes main body preliminary bracing, mid-board supporting and interim inverted arch supporting, in each pilot drive Afterwards, the preliminary bracing needs to be closed.
Double side wall tunnel temporary supporting system construction stops when being moved to CRD tunnel partition walls and the coincidence of interim inverted arch Only.
Fine-tuning benching tunnelling method tunnel step height in the first step, makes double side wall up/down steps inverted arch and benching tunnelling method step It is completely superposed.
In 5th step, large cross-section tunnel gib and interim inverted arch are removed after construction, carry out two lining constructions.
The beneficial effects of the invention are as follows:
The present invention is combined and is constructed using the movement of two side-wall pilot tunnel mid-board and remaining core soil in advance, facilitates construction, Reserved double side wall Core Soil of getting out of a predicament or an embarrassing situation excavates after tunnel conversion, ensure that the safety of tunnel excavation, reduces cost, accelerate to apply Work progress, arrangement and method for construction adjustment flexibility is big, and surrouding rock deformation hardly develops, and disclosure satisfy that the project stringent to deformation requirements Construction.
Description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is single hole big cross section double side wall tunnel structure schematic diagram of the invention.
Drawing reference numeral explanation:1, mid-board on the right side of double side wall;2, interim inverted arch on the right side of double side wall;3, interval on the left of double side wall Wall;4, interim inverted arch in the middle part of double side wall;5, interim inverted arch on the left of double side wall;6, Core Soil.
Specific implementation mode
As shown in Figure 1, one of embodiment provided by the invention, single hole large cross-section tunnel double side wall construction conversion process, packet Include following steps:
The first step:Mid-board 3 is moved to the left on the left of large cross-section tunnel double side wall overlaps with CRD mid-boards, above and below double side wall The interim inverted arch of step is moved to coincidence to the interim inverted arch of CRD up/down steps;
Second step:Double side wall right side base tunnel top bar excavation supporting simultaneously applies interim inverted arch 2 on the right side of double side wall, the double side wall right side Side is got out of a predicament or an embarrassing situation excavation supporting, and base tunnel top bar excavation supporting simultaneously applies interim inverted arch 5, double side wall on the left of double side wall on the left of double side wall Left side is got out of a predicament or an embarrassing situation excavation supporting, and top bar excavation supporting simultaneously applies interim inverted arch 4 in the middle part of double side wall in the middle part of double side wall, in double side wall Subordinate's step remaining core soil in advance 6;
Third walks:Light section benching tunnelling method top bar excavation supporting, excavation supporting of getting out of a predicament or an embarrassing situation;
4th step:Middle section CRD left side top bar excavation supportings simultaneously apply interim inverted arch, excavation branch of getting out of a predicament or an embarrassing situation on the left of CRD Shield, CRD right side top bar excavation supportings simultaneously apply interim inverted arch;
5th step:It gets out of a predicament or an embarrassing situation in the middle part of double side wall Core Soil excavation supporting, excavation supporting of getting out of a predicament or an embarrassing situation on the right side of CRD.
25m starts in face of double side wall tunnel excavation to tunnel conversion, mid-board 3 on the left of large cross-section tunnel double side wall by Step is moved to the left, until being overlapped with CRD or so mid-board, interim inverted arch 5 moves gradually downward on the left of double side wall, until and CRD The interim inverted arch of step overlaps in up and down.If inverted arch is not completely superposed with benching tunnelling method step when double side wall up/down steps, need to finely tune Benching tunnelling method tunnel step height makes its coincidence.
When construction large cross-section tunnel double side wall mid-board and interim inverted arch, while During Initial Stage Construction supporting and temporary supporting system Installation, temporary supporting system construction stop when being moved to CRD tunnel partition walls and the coincidence of interim inverted arch, and the preliminary bracing includes Gibs, the preliminary bracings such as main body preliminary bracing, mid-board supporting and interim inverted arch supporting need to be in each pilot drives After be closed.
After completing preliminary bracing, continue gradually construction double side wall right side top bar excavation supporting and apply to face on the right side of double side wall When inverted arch 2, excavation supporting of getting out of a predicament or an embarrassing situation on the right side of double side wall, top bar excavation supporting on the left of double side wall gets out of a predicament or an embarrassing situation out on the left of double side wall Supporting is dug, double side wall middle part top bar excavation supporting simultaneously applies interim inverted arch 4 in the middle part of double side wall, gets out of a predicament or an embarrassing situation in the middle part of double side wall reserved Core Soil 6.
Then light section benching tunnelling method constructing tunnel top bar, excavation supporting of getting out of a predicament or an embarrassing situation are carried out, CRD tunnel excavation supports are simultaneously applied Make interim inverted arch, top bar excavation supporting on the right side of get out of a predicament or an embarrassing situation on the left of CRD excavation supporting and CRD.
Soil of getting out of a predicament or an embarrassing situation in the middle part of big cross section double side wall tunnel is finally excavated, excavation supporting of getting out of a predicament or an embarrassing situation on the right side of the tunnels construction CRD is complete After construction, large cross-section tunnel gib and interim inverted arch are removed, carries out two lining constructions.
The above, only presently preferred embodiments of the present invention, the invention is not limited in the above embodiments, as long as It reaches the technique effect of the present invention with identical means, should all belong to the scope of protection of the present invention.

Claims (6)

  1. The conversion process 1. single hole large cross-section tunnel double side wall is constructed, which is characterized in that include the following steps:
    The first step:Mid-board is moved to the left on the left of large cross-section tunnel double side wall overlaps with CRD mid-boards, and double side wall up/down steps face When inverted arch move down to be moved to the interim inverted arch of CRD up/down steps and overlap;
    Second step:Base tunnel top bar, excavation supporting of getting out of a predicament or an embarrassing situation on the right side of double side wall, double side wall left side base tunnel top bar are got out of a predicament or an embarrassing situation out Supporting is dug, double side wall middle part top bar excavation supporting reserves Core Soil of getting out of a predicament or an embarrassing situation in the middle part of double side wall;
    Third walks:Light section benching tunnelling method top bar, excavation supporting of getting out of a predicament or an embarrassing situation;
    4th step:Top bar, excavation supporting of getting out of a predicament or an embarrassing situation on the left of middle section CRD, the right sides CRD top bar excavation supporting;
    5th step:It gets out of a predicament or an embarrassing situation in the middle part of double side wall Core Soil excavation supporting, excavation supporting of getting out of a predicament or an embarrassing situation on the right side of CRD.
  2. The conversion process 2. list hole according to claim 1 large cross-section tunnel double side wall is constructed, it is characterised in that:In the first step A distance starts to construct in face of double side wall tunnel excavation to tunnel conversion, while During Initial Stage Construction supporting and temporary supporting system peace Dress.
  3. The conversion process 3. list hole according to claim 2 large cross-section tunnel double side wall is constructed, it is characterised in that:The initial stage Supporting includes main body preliminary bracing, mid-board supporting and interim inverted arch supporting, and after each pilot drive, the preliminary bracing needs It is closed.
  4. The conversion process 4. list hole according to claim 2 large cross-section tunnel double side wall is constructed, it is characterised in that:The bilateral The temporary supporting system construction of wall tunnel stops when being moved to CRD tunnel partition walls and the coincidence of interim inverted arch.
  5. The conversion process 5. list hole according to claim 1 large cross-section tunnel double side wall is constructed, it is characterised in that:In the first step Fine-tuning benching tunnelling method tunnel step height, makes double side wall up/down steps inverted arch be completely superposed with benching tunnelling method step.
  6. The conversion process 6. list hole according to claim 1 large cross-section tunnel double side wall is constructed, it is characterised in that:5th step In, large cross-section tunnel gib and interim inverted arch are removed after construction, carry out two lining constructions.
CN201710748122.2A 2017-08-28 2017-08-28 Single hole large cross-section tunnel double side wall construction conversion process Active CN107605490B (en)

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Publication number Priority date Publication date Assignee Title
CN109611101A (en) * 2018-12-04 2019-04-12 中铁二十四局集团有限公司 A kind of section in Tunneling by mining method converts construction technology
CN109630140B (en) * 2018-12-14 2020-10-30 中交路桥建设有限公司 Dynamic partition pit guiding method for large-section gradual change tunnel to penetrate through weak surrounding rock stratum
CN109989757A (en) * 2019-04-03 2019-07-09 长安大学 Super-span tunnel is in V grade of engineering method conversion construction method to IV grade of country rock section
CN110331980A (en) * 2019-06-17 2019-10-15 中国铁建大桥工程局集团有限公司 A kind of shallow embedding fine sand layer tunnel Varied section transition and conversion construction method
CN110821502A (en) * 2019-11-29 2020-02-21 中铁隧道局集团有限公司 Novel construction method for entrance section of weak surrounding rock large-span mountain tunnel

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