CN104806251B - Subsidiary inverted excavation construction method for urban subway station under complex environment - Google Patents

Subsidiary inverted excavation construction method for urban subway station under complex environment Download PDF

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Publication number
CN104806251B
CN104806251B CN201510203753.7A CN201510203753A CN104806251B CN 104806251 B CN104806251 B CN 104806251B CN 201510203753 A CN201510203753 A CN 201510203753A CN 104806251 B CN104806251 B CN 104806251B
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China
Prior art keywords
excavation
construction
pilot tunnel
layer
supporting
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CN201510203753.7A
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Chinese (zh)
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CN104806251A (en
Inventor
罗富荣
童利红
张成满
王刚
徐凌
汪玉华
高亚彬
黄齐武
曹伍富
李名淦
虞蕹
张昊
代永双
王余良
张瑜
李全才
刘刚
张金亮
王玉龙
张飞
路开锋
苏洪波
李立功
朱发雨
许景昭
陈明昊
代昱昊
林纯鹏
杨壮志
赵宝华
刘涛
王振飞
贾喜涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZHONGTIE TUNNEL GROUP CO Ltd
BEIJING MTR CONSTRUCTION ADMINISTRATION Corp
Beijing General Municipal Engineering Design and Research Institute Co Ltd
Original Assignee
ZHONGTIE TUNNEL GROUP CO Ltd
BEIJING MTR CONSTRUCTION ADMINISTRATION Corp
Beijing General Municipal Engineering Design and Research Institute Co Ltd
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Application filed by ZHONGTIE TUNNEL GROUP CO Ltd, BEIJING MTR CONSTRUCTION ADMINISTRATION Corp, Beijing General Municipal Engineering Design and Research Institute Co Ltd filed Critical ZHONGTIE TUNNEL GROUP CO Ltd
Priority to CN201510203753.7A priority Critical patent/CN104806251B/en
Publication of CN104806251A publication Critical patent/CN104806251A/en
Application granted granted Critical
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Classifications

    • 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
    • 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
    • E21D9/001Improving soil or rock, e.g. by freezing; Injections

Abstract

The invention discloses a subsidiary inverted excavation construction method for an urban subway station under the complex environment and relates to the field of tunnel excavation. The method comprises the following steps of before inverted excavation construction, layering and segmenting the section according to the size of the section; before excavation, reinforcing a front soil body of a first-layer pilot tunnel excavation face by adopting deep-hole pre-grouting; performing excavation and primary support on a first-layer pilot tunnel by adopting an upper-lower step method; after the excavation and primary support of the first-layer pilot tunnel (6) are completely finished, performing excavation and primary support of a second-layer pilot tunnel, repeating the operation for a third-layer pilot tunnel, and performing next-layer pilot tunnel construction according to the mode; after the excavation of pilot tunnels of all layers are finished and the deformation of the primary support (2) is stabilized, dismantling a temporary support by adopting a piecewise interval method. According to the subsidiary inverted excavation construction method disclosed by the invention, the risk of the inverted excavation construction is greatly reduced, the construction safety is guaranteed, and the concealed excavation construction method of the tunnel is enriched; meanwhile, the parallel operation of demolition of an open excavation section and a concealed excavation section is also realized, so that the construction period is shortened.

Description

One kind faces upward cut construction method for City Subway Station to be attached under complex environment
【Technical field】
The present invention relates to tunnelling field, and in particular to one kind faces upward digging for City Subway Station to be attached under complex environment Construction method.
【Background technology】
City Subway Station is all located at city prosperity location substantially, and surrounding enviroment are complicated, by municipal pipeline or building shadow Ring, mostly using boring construction, only adopting cut and cover tunneling near the very shallow location of ground buried depth;For construction safety, with Toward being all open excavation section of first constructing, construct afterwards tunneling section, after the completion of open-cut, the scope of operation provided using open excavation section, by upper Downwards, excavation construction of bowing is carried out to station extreme direction;But due to being limited by periphery site condition, some open excavation sections near ground are deposited Change the phenomenon of shift time cycle length in building removal or pipeline, such as still traditionally construct, will seriously restrict the duration;Such as Fruit is using tunneling section of first constructing, open excavation section of constructing afterwards, the scope of operation provided using station end, from bottom to top, near ground surface end Open excavation section carry out facing upward excavation construction, now tunneling section construction and open excavation section building remove or pipeline change shifting can with parallel operations, The substantial amounts of duration can be saved;But when facing upward excavation construction, due to there is an elevation angle, the excavation face soil body can be produced under Gravitative Loads One downslide component, self-stable ability is poor, while can also cause advanced tubule supporting scope to shorten, such as adopts traditional tunneling Construction technology, it is easy to cause excavation face and arch to cave in, construction risk is very big, generally all forbids adopting.
【The content of the invention】
In order to overcome the shortcomings of above-mentioned technology, the invention provides a kind of attached for City Subway Station under complex environment Cut construction method is faced upward, by carrying out grouting and reinforcing to necromancer body in face of excavation, working procedure, height and the platform of each layer pilot tunnel is adjusted The size of rank, can not only resist the downslide component impact that excavation face front soil body Gravitative Loads power is produced, and also improve Core Soil Self-stability, not only greatly reduce and face upward excavation construction risk, it is ensured that construction safety, enrich bored tunnel construction method, Open excavation section is also achieved simultaneously to remove and tunneling section parallel operations, has saved the duration.
To realize goal of the invention as above, the present invention adopts technical scheme as described below:
One kind faces upward cut construction method for City Subway Station to be attached under complex environment, it is characterized in that:Methods described is concrete Comprise the steps:
The first step, before excavation construction is faced upward, section is layered according to cross dimensions, branch;
Second step, previous step is connect, before excavation, the front soil body in ground floor pilot drive face is entered using Deep-hole Pre-grouting Row soil stabilization, below ground floor before each layer pilot drive in the scall of Extra-fine sand, also takes deep hole to note in advance Slurry measure carries out front soil stabilization;
3rd step, ground floor pilot tunnel is excavated and preliminary bracing using upper and lower benching tunnelling method, the length of the bench excavation Degree >=5m, the height≤2m of bench excavation;After ground floor pilot drive and preliminary bracing are fully completed, second layer pilot tunnel is carried out Excavate and preliminary bracing, third layer pilot tunnel repeats second layer pilot tunnel, and the rest may be inferred, carries out lower floor's pilot tunnel construction;
4th step, treat that each layer pilot tunnel is all ended and complete, after preliminary bracing stabilization, by temporary support using between segmentation Remove every method, the order of dismounting from bottom to top, when interim median septum is removed, only abolishes concrete, then directly carry out waterproof and Two lining operations.
Described faces upward cut construction method for City Subway Station under complex environment to be attached, it is characterized in that:The first step Section layering in ground floor height≤2.5m, below each layer height≤3.5m.
Described faces upward cut construction method for City Subway Station under complex environment to be attached, it is characterized in that:3rd step Each layer excavation method adopt benching tunneling method.
Described faces upward cut construction method for City Subway Station under complex environment to be attached, it is characterized in that:The ground floor Construction procedure be:First to the pilot tunnel of interim median septum side, 1. portion is excavated and supporting, and pilot tunnel is 1. after the completion of portion, then centering The pilot tunnel of next door opposite side 2. excavated and supporting by portion;After ground floor construction is finished, second layer construction is carried out, its construction step Suddenly it is:First to the side pilot tunnel of interim median septum, 3. portion is excavated and supporting, treat pilot tunnel 3. portion excavate and supporting complete 10m with Afterwards, 4. portion excavates and supporting to carry out pilot tunnel;After second layer construction is finished, third layer construction is carried out, its construction procedure is:Wait to lead 5. portion excavates and supporting is completed after 10m in hole, and 6. portion excavates and supporting to carry out pilot tunnel, and below every layer of pilot tunnel be by that analogy.
Described faces upward cut construction method for City Subway Station under complex environment to be attached, it is characterized in that:4th step It is 4m~6m that length is removed in the segmentation of section gap dismounting method.
Using technical scheme as above, the present invention has superiority as described below:
The present invention is by carrying out grouting and reinforcing to necromancer body in face of excavation, and working procedure, the pilot tunnel for adjusting each layer pilot tunnel is high Degree and step dimension, can not only resist the downslide component impact that excavation face front soil body Gravitative Loads power is produced, and also improve core The self-stability of cubsoil;Under complex environment of the present invention subway station it is attached face upward cut construction method and greatly reduce face upward digging and apply Work risk, it is ensured that construction safety, enriches bored tunnel construction method, while also achieve open excavation section removing and tunneling Duan Ping Row operation, has saved the duration.
【Description of the drawings】
Fig. 1 is the sectional schematic diagram of the present invention;
Fig. 2 is using the section layering schematic diagram of the present invention;
Fig. 3 is the section branch schematic diagram using the present invention.
In figure:1st, advanced tubule;2nd, preliminary bracing;3rd, lock foot anchoring stock;4th, interim inverted arch;5th, interim median septum;6、 Ground floor;7th, the second layer;8th, third layer;9th, 1. portion;10th, 2. portion;11st, 3. portion;12nd, 4. portion;13rd, 5. portion;14th, 6. portion.
【Specific embodiment】
The present invention can be explained in more detail by the following examples, the following examples are the invention is not limited in;
With reference to described in accompanying drawing 1-3 for complex environment under City Subway Station is attached faces upward cut construction method, it is characterized in that: Methods described specifically includes following steps:
The first step, before excavation construction is faced upward, section is layered according to cross dimensions, branch, the sectional layer can be divided into At least two-layer;
Second step, previous step is connect, before excavation, Deep-hole Pre-grouting is adopted to the front soil body in the pilot drive face of ground floor 6 Soil stabilization is carried out, before each layer pilot drive that ground floor is in the scall of Extra-fine sand below 6, also takes deep hole pre- Slip casting measure carries out front soil stabilization;
3rd step, the pilot tunnel of ground floor 6 is excavated and preliminary bracing 2 using upper and lower benching tunnelling method, the bench excavation Length >=5m, the height≤2m of bench excavation;After the pilot drive of ground floor 6 and preliminary bracing 2 are fully completed, the second layer is carried out 7 pilot drives and preliminary bracing 2, the pilot tunnel of third layer 8 repeats the pilot tunnel of the second layer 7, and the rest may be inferred, carries out lower floor's pilot tunnel construction, applies Monitoring should be strengthened during work;
4th step, treat that each layer pilot tunnel is all ended and complete, after the stabilization of preliminary bracing 2, by temporary support using being segmented Interval method is removed, and the order of dismounting from bottom to top, when interim median septum 5 is removed, only abolishes concrete, then directly carries out waterproof And two lining operation.
Described faces upward cut construction method for City Subway Station under complex environment to be attached, it is characterized in that:The first step Section layering in ground floor 6 height≤2.5m, below each layer height≤3.5m.
Described faces upward cut construction method for City Subway Station under complex environment to be attached, it is characterized in that:3rd step Each layer excavation method adopt benching tunneling method.
Described faces upward cut construction method for City Subway Station under complex environment to be attached, it is characterized in that:The ground floor 6 Construction procedure be:First to the pilot tunnel of the side of interim median septum 5,1. portion 9 is excavated and supporting, and pilot tunnel is 1. after the completion of 9, then To the pilot tunnel of the opposite side of median septum 5,2. portion 10 is excavated and supporting;After the construction of ground floor 6 is finished, carry out the second layer 7 and apply Work, its construction procedure is:First to the side pilot tunnel of interim median septum 5,3. portion 11 is excavated and supporting, treats that 3. portion 11 opens pilot tunnel Dig and supporting is completed after 10m, 4. portion 12 excavates and supporting to carry out pilot tunnel;After the construction of the second layer 7 is finished, third layer 8 is carried out Construct, its construction procedure is:After pilot tunnel, 5. portion 13 excavates and after supporting completes 10m, and 6. portion 14 excavates and supporting to carry out pilot tunnel, with Under every layer of pilot tunnel by that analogy.
Described faces upward cut construction method for City Subway Station under complex environment to be attached, it is characterized in that:4th step It is 4m~6m that length is removed in the segmentation of section gap dismounting method, and concrete length should at any time be adjusted according to Monitoring Result.
Embodiment
Implement under complex environment of the present invention that subway station is attached to face upward cut construction method with reference to accompanying drawing 1,2 and accompanying drawing 3, Its step is as follows:
A, before facing upward and digging section construction, first section is divided into into three layers six according to cross dimensions, the height of ground floor 6 is not more than 2.5m, second and third layer height is not more than 3.5m;
B, to the pilot tunnel of ground floor 6 1. portion 9,2. the excavation face of portion 10 front the soil body carry out Deep-hole Pre-grouting, and contour line outer shroud Range of grouting should suitably increase according to strata condition, if lower floor's pilot tunnel 3. portion 11,4. portion 12,5. portion 13,6. portion 14 in powder it is thin In the scalls such as sand, Deep-hole Pre-grouting measure should be also taken;
C, 1. portion 9 constructs to carry out the pilot tunnel of ground floor 6, and first advanced tubule 1 is applied in arch before excavating, after the completion of slip casting, 1. the pilot drive of portion 9 and supporting are carried out using up/down steps remaining core soil in advance, excavation drilling depth is 0.5m, and length of bench is typically not Less than 5m, and bench excavation height not should be greater than 2m, and During Initial Stage Construction supporting 2, interim median septum 5, interim inverted arch 4 in time, lock Foot anchor pole 3, after 1. the pilot drive of portion 9 and supporting are fully completed, 2. portion 10 excavates and preliminary bracing to carry out the pilot tunnel of ground floor 6, Step is with 1. portion;
D, the 1. portion 9 for treating ground floor 6,2. portion 10 construct after the completion of, 3. portion 11 constructs to carry out the pilot tunnel of the second layer 7, upper and lower Rank method is excavated and supporting, and step is stayed and set and supporting is with 1. portion 9,2. portion 10, treat the 3. pilot drive of portion 11 and supporting 10m with Afterwards, 4. portion 12 excavates and supporting to carry out the pilot tunnel of the second layer 7;
After the completion of E, the 4. 3. portion 11 for treating the second layer 7, the pilot drive of portion 12 and supporting, the 5. portion 13,6. of third layer 8 is carried out The pilot drive of portion 14 and supporting, step is with the 3. portion 11 of the second layer 7, the 4. pilot drive of portion 12 and supporting;
F, 1. portion 9,2. portion 10,3. portion 11,4. portion 12,5. portion 13, the 6. pilot tunnel of portion 14 are all applied and completed, and a just deformation After stable, temporary support is carried out(Interim inverted arch, interim median septum)Remove and two lining constructions.Temporary support takes section gap to tear open Remove, remove length 4m~6m, concrete length should at any time be adjusted according to Monitoring Result.Abolish first paragraph third layer 8 first to face When median septum concrete, then carry out construction of bottom plates, reach remove from bottom to top again after intensity interim inverted arch and abolish it is interim in Next door concrete, applies successively abutment wall and the lining of arch two, after the lining of first paragraph two is fully completed and reaches design strength, takes same Sample step carries out the dismounting of second segment temporary support and two lining constructions.
Part not in the detailed description of the invention is prior art.
The embodiment selected herein for the open purpose of the present invention, is presently considered to be suitable, but, Ying Liao Solution, it is contemplated that belonging to this design and all changes and the improvement of the embodiment in invention scope including all.

Claims (4)

1. it is a kind of to face upward cut construction method for City Subway Station to be attached under complex environment, it is characterized in that:Methods described is specifically wrapped Include following steps:
The first step, before excavation construction is faced upward, section is layered according to cross dimensions, branch;
Second step, previous step is connect, before excavation, to ground floor(6)The front soil body in pilot drive face is entered using Deep-hole Pre-grouting Row soil stabilization, in ground floor(6)Below before each layer pilot drive in the scall of Extra-fine sand, also take deep hole pre- Slip casting measure carries out front soil stabilization;
3rd step, by ground floor(6)Pilot tunnel is excavated and preliminary bracing using upper and lower benching tunnelling method(2), the bench excavation Length >=5m, the height≤2m of bench excavation;Treat ground floor(6)Pilot drive and preliminary bracing(2)After being fully completed, is carried out Two layers(7)Pilot drive and preliminary bracing(2), third layer(8)Pilot tunnel repeats the second layer(7)Pilot tunnel, the rest may be inferred, carries out lower floor Pilot tunnel is constructed;Ground floor in the layering of first step section(6)Height≤2.5m, below each layer height≤3.5m;
4th step, treat that each layer pilot tunnel is all excavated and complete, preliminary bracing(2)After stabilization, by temporary support using between segmentation Every method remove, the order of dismounting from bottom to top, interim median septum(5)During dismounting, concrete is only abolished, then directly carry out waterproof And two lining operation.
2. it is according to claim 1 to face upward cut construction method for City Subway Station under complex environment to be attached, it is characterized in that: The excavation method of each layer of the 3rd step adopts benching tunneling method.
3. it is according to claim 1 to face upward cut construction method for City Subway Station under complex environment to be attached, it is characterized in that: The ground floor(6)Construction procedure be:First to interim median septum(5)The pilot tunnel of side 1. portion(9)Excavated and supporting, led Hole 1. portion(9)After the completion of, then to median septum(5)The pilot tunnel of opposite side 2. portion(10)Excavated and supporting;Treat ground floor(6)Apply After work is finished, the second layer is carried out(7)Construct, its construction procedure is:First to interim median septum(5)Side pilot tunnel 3. portion(11)Enter Row is excavated and supporting, treats pilot tunnel 3. portion(11)Excavate and supporting is completed after 10m, carry out pilot tunnel 4. portion(12)Excavate and supporting; Treat the second layer(7)After construction is finished, third layer is carried out(8)Construct, its construction procedure is:Treat pilot tunnel 5. portion(13)Excavate and supporting After completing 10m, pilot tunnel 6. portion is carried out(14)Excavate and supporting, below every layer of pilot tunnel be by that analogy.
4. it is according to claim 1 to face upward cut construction method for City Subway Station under complex environment to be attached, it is characterized in that: It is 4m~6m that length is removed in the segmentation of the 4th step section gap dismounting method.
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CN106437725A (en) * 2016-10-31 2017-02-22 北京市政建设集团有限责任公司 Air flue underground excavation section structural construction method
CN109339798B (en) * 2018-10-19 2021-05-04 重庆大学 Core soil removing method for improving tunnel double-side-wall pit guiding method construction
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