CN104806251A - 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 PDFInfo
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- CN104806251A CN104806251A CN201510203753.7A CN201510203753A CN104806251A CN 104806251 A CN104806251 A CN 104806251A CN 201510203753 A CN201510203753 A CN 201510203753A CN 104806251 A CN104806251 A CN 104806251A
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving 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
[technical field]
The present invention relates to tunnelling field, be specifically related to one and face upward cut construction method for City Subway Station under complex environment is attached.
[background technology]
City Subway Station is substantially all located at bustling location, city, and surrounding enviroment are complicated, by municipal pipeline or effect on building, mostly adopt boring construction, is only adopting cut and cover tunneling near the very shallow location of ground buried depth; In order to construction safety, be all open excavation section of first constructing, rear construction tunneling section, after open-cut completes, utilizes the scope of operation that open excavation section provides, and from top to bottom, carries out bowing excavation construction to station extreme direction in the past; But owing to limiting by periphery site condition, there is building and to remove or pipeline changes shift time cycle long phenomenon in some open excavation section near ground, as still traditionally constructed, seriously will restrict the duration; If adopt tunneling section of first constructing, rear construction open excavation section, utilizes the scope of operation that station end provides, from bottom to top, carry out facing upward excavation construction near the open excavation section of ground surface end, the construction of now tunneling section and the removal of open excavation section building or pipeline change that move can parallel operations, can save a large amount of durations; But when facing upward excavation construction, owing to there is an elevation angle, the excavation face soil body can produce a downslide component under Gravitative Loads, self-stable ability is poor, advanced tubule supporting scope also can be caused simultaneously to shorten, as adopted traditional boring construction technique, be easy to cause excavation face and arch to cave in, construction risk is very large, generally all forbids adopting.
[summary of the invention]
In order to overcome the deficiency of above-mentioned technology, the invention provides one and face upward cut construction method for City Subway Station under complex environment is attached, by carrying out grouting and reinforcing to necromancer body in face of excavation, adjust the working procedure of each layer pilot tunnel, the size of height and step, not only can resist the downslide component impact that excavation face front soil body Gravitative Loads power produces, also improve the self-stability of Core Soil, not only greatly reduce and face upward excavation construction risk, ensure that construction safety, enrich bored tunnel construction method, also achieve open excavation section to remove and the parallel operations of tunneling section simultaneously, save the duration.
For realizing goal of the invention as above, the present invention adopts technical scheme as described below:
One faces upward cut construction method for City Subway Station is attached under complex environment, it is characterized in that: described method specifically comprises the steps:
The first step, before facing upward excavation construction, according to cross dimensions, section is carried out layering, branch;
Second step, connect previous step, before excavation, adopt Deep-hole Pre-grouting to carry out soil stabilization to the front soil body in first floor pilot drive face, be in each layer pilot drive in the scall of Extra-fine sand below first floor before, also take Deep-hole Pre-grouting measure to carry out front soil stabilization;
3rd step, upper and lower benching tunnelling method is adopted to carry out excavating and preliminary bracing first floor pilot tunnel, the length >=5m of described bench excavation, the height≤2m of bench excavation; After first floor pilot drive and preliminary bracing all complete, carry out second layer pilot drive 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 has all ended, after preliminary bracing stabilization, temporary support adopted section gap method to remove, the order of dismounting, when interim median septum is removed, only abolishes concrete from bottom to top, then directly carries out waterproof and two lining operations.
Described faces upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: the height≤2.5m of first floor in the layering of described first step section, below the height≤3.5m of each layer.
Described faces upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: the excavation method of every one deck of described 3rd step all adopts benching tunneling method.
Described faces upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: the construction sequence of described first floor is: first 1. the pilot tunnel of interim median septum side is excavated and supporting in portion, 2. pilot tunnel after 1. portion completes, then excavates and supporting in portion the pilot tunnel of median septum opposite side; After treating first floor construction, carry out second layer construction, its construction sequence is: first 3. excavate and supporting in portion the side pilot tunnel of interim median septum, treats pilot tunnel 3. portion's excavation and after supporting completes 10m, carries out pilot tunnel 4. portion's excavation and supporting; After treating second layer construction, carry out third layer construction, its construction sequence is: after until pilot tunnel, 5. portion's excavation and supporting complete 10m, and carry out pilot tunnel 6. portion's excavation and supporting, every layer of pilot tunnel by that analogy below.
Described faces upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: it is 4m ~ 6m that length is removed in the segmentation of described 4th step section gap dismounting method.
Adopt technical scheme as above, the present invention has superiority as described below:
The present invention, by carrying out grouting and reinforcing to necromancer body in face of excavation, adjusts the working procedure of each layer pilot tunnel, pilot tunnel height and step dimension, not only can resist the downslide component impact that excavation face front soil body Gravitative Loads power produces, also improve the self-stability of Core Soil; Under complex environment of the present invention, the attached cut construction method of facing upward in subway station greatly reduces and faces upward excavation construction risk, ensure that construction safety, enrich bored tunnel construction method, also achieved open excavation section simultaneously and remove and the parallel operations of tunneling section, saved the duration.
[accompanying drawing explanation]
Fig. 1 is sectional schematic diagram of the present invention;
Fig. 2 is application section layering schematic diagram of the present invention;
Fig. 3 is application section branch of the present invention schematic diagram.
In the drawings: 1, advanced tubule; 2, preliminary bracing; 3, lock foot anchoring stock; 4, Temporary invert; 5, interim median septum; 6, first floor; 7, the second layer; 8, third layer; 9,1. portion; 10,2. portion; 11,3. portion; 12,4. portion; 13,5. portion; 14,6. portion.
[detailed description of the invention]
Can explain the present invention in more detail by the following examples, the present invention is not limited to the following examples;
Face upward cut construction method for City Subway Station under complex environment is attached by reference to the accompanying drawings described in 1-3, it is characterized in that: described method specifically comprises the steps:
The first step, before facing upward excavation construction, according to cross dimensions, section is carried out layering, branch, described sectional layer can be divided at least two-layer;
Second step, connect previous step, before excavation, adopt Deep-hole Pre-grouting to carry out soil stabilization to the front soil body in first floor 6 pilot drive face, be in each layer pilot drive in the scall of Extra-fine sand at first floor less than 6 before, also take Deep-hole Pre-grouting measure to carry out front soil stabilization;
3rd step, upper and lower benching tunnelling method is adopted to carry out excavating and preliminary bracing 2 first floor 6 pilot tunnel, the length >=5m of described bench excavation, the height≤2m of bench excavation; After first floor 6 pilot drive and preliminary bracing 2 all complete, carry out the second layer 7 pilot drive and preliminary bracing 2, third layer 8 pilot tunnel repeats the second layer 7 pilot tunnel, and the rest may be inferred, carries out lower floor's pilot tunnel construction, should strengthen monitoring in work progress;
4th step, treat that each layer pilot tunnel has all ended, after preliminary bracing 2 stabilization, temporary support adopted section gap method to remove, the order of dismounting, when interim median septum 5 is removed, only abolishes concrete from bottom to top, then directly carries out waterproof and two lining operations.
Described faces upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: the height≤2.5m of first floor 6 in the layering of described first step section, below the height≤3.5m of each layer.
Described faces upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: the excavation method of every one deck of described 3rd step all adopts benching tunneling method.
Described faces upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: the construction sequence of described first floor 6 is: first 1. the pilot tunnel of interim median septum 5 side is excavated and supporting in portion 9, pilot tunnel 1. 9 complete after, more 2. the pilot tunnel of median septum 5 opposite side to be excavated and supporting in portion 10; After treating that first floor 6 is constructed, carry out the second layer 7 and construct, its construction sequence is: first 3. excavate and supporting in portion 11 the side pilot tunnel of interim median septum 5, treats that 3. pilot tunnel excavates and after supporting completes 10m, carry out pilot tunnel and 4. excavate and supporting in portion 12 in portion 11; After treating that the second layer 7 is constructed, carry out third layer 8 and construct, its construction sequence is: 5. to excavate and after supporting completes 10m, carry out pilot tunnel and 6. excavate and supporting in portion 14, every layer of pilot tunnel by that analogy below in portion 13 until pilot tunnel.
Described faces upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: it is 4m ~ 6m that length is removed in the segmentation of described 4th step section gap dismounting method, and concrete length should adjust at any time according to Monitoring Result.
Embodiment
By reference to the accompanying drawings 1,2 and accompanying drawing 3 to implement under complex environment of the present invention that subway station is attached faces upward cut construction method, its step is as follows:
A, before facing upward the section of digging construction, first according to cross dimensions, section is divided into three layers six, first floor 6 is highly not more than 2.5m, and second and third layer height is not more than 3.5m;
B, to first floor 6 pilot tunnel, 1. portion 9,2. excavation face front, portion 10 soil body carry out Deep-hole Pre-grouting, and outline line outer shroud range of grouting suitably should increase according to strata condition, if lower floor's pilot tunnel 3. portion 11,4. portion 12,5. portion 13,6. portion 14 is in the scalls such as Extra-fine sand, also Deep-hole Pre-grouting measure should be taked;
C, carry out first floor 6 pilot tunnel and 1. construct in portion 9, first advanced tubule 1 is applied in arch before excavation, after slip casting completes, up/down steps remaining core soil in advance is adopted to carry out 1. portion 9 pilot drive and supporting, excavation drilling depth is 0.5m, length of bench is generally not less than 5m, and bench excavation height should not be greater than 2m, and During Initial Stage Construction supporting 2 in time, temporarily median septum 5, Temporary invert 4, lock foot anchoring stock 3, after 1. portion 9 pilot drive and supporting all complete, carry out first floor 6 pilot tunnel and 2. excavate and preliminary bracing in portion 10, the same 1. portion of step;
D, until the 1. portion 9 of first floor 6, after 2. portion 10 has constructed, carry out the second layer 7 pilot tunnel 3. to construct in portion 11, upper and lower benching tunnelling method carries out excavating and supporting, step stays to be established and supporting same 1. portion 9,2. portion 10, treat, 3. after portion 11 pilot drive and supporting 10m, to carry out the second layer 7 pilot tunnel and 4. excavate and supporting in portion 12;
E, until the 3. portion 11 of the second layer 7, after 4. portion 12 pilot drive and supporting complete, carry out the 5. portion 13 of third layer 8,6. portion 14 pilot drive and supporting, step is with the 3. portion 11 of the second layer 7,4. portion 12 pilot drive and supporting;
F, 1. portion 9,2. portion 10,3. portion 11,4. portion 12,5. portion 13,6. portion 14 pilot tunnel have all applied, and after just propping up stabilization, carry out temporary support (Temporary invert, interim median septum) and remove and two lining constructions.Temporary support takes section gap to remove, and remove length 4m ~ 6m, concrete length should adjust at any time according to Monitoring Result.First the interim median septum concrete of first paragraph third layer 8 is abolished, then construction of bottom plates is carried out, remove Temporary invert after reaching intensity more from bottom to top and abolish interim median septum concrete, apply abutment wall and arch two lining successively, serve as a contrast until first paragraph two and all complete and after reaching design strength, take same step to carry 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 in this article in order to open object of the present invention, currently thinks to be suitable for, but it is to be understood that the present invention is intended to comprise all changes belonging to the embodiment in this design and invention scope and improvement.
Claims (5)
1. face upward a cut construction method for City Subway Station under complex environment is attached, it is characterized in that: described method specifically comprises the steps:
The first step, before facing upward excavation construction, according to cross dimensions, section is carried out layering, branch;
Second step, connect previous step, before excavation, Deep-hole Pre-grouting is adopted to carry out soil stabilization to the front soil body in first floor (6) pilot drive face, be in each layer pilot drive in the scall of Extra-fine sand below first floor (6) before, Deep-hole Pre-grouting measure is also taked to carry out front soil stabilization;
3rd step, upper and lower benching tunnelling method is adopted to carry out excavating and preliminary bracing (2) first floor (6) pilot tunnel, the length >=5m of described bench excavation, the height≤2m of bench excavation; After first floor (6) pilot drive and preliminary bracing (2) all complete, carry out the second layer (7) pilot drive and preliminary bracing (2), third layer (8) pilot tunnel repeats the second layer (7) pilot tunnel, and the rest may be inferred, carries out lower floor's pilot tunnel construction;
4th step, treat that each layer pilot tunnel has all ended, after preliminary bracing (2) stabilization, temporary support adopted section gap method to remove, the order of removing from bottom to top, when interim median septum (5) is removed, only abolish concrete, then directly carry out waterproof and two lining operations.
2. according to claim 1ly face upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: the height≤2.5m of first floor (6) in the layering of described first step section, below the height≤3.5m of each layer.
3. according to claim 1ly face upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: the excavation method of every one deck of described 3rd step all adopts benching tunneling method.
4. according to claim 1ly face upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: the construction sequence of described first floor (6) is: first to the pilot tunnel of interim median septum (5) side 1. portion (9) excavate and supporting, pilot tunnel is after 1. (9) portion completes, then to the pilot tunnel of median septum (5) opposite side 2. portion (10) excavate and supporting; After treating first floor (6) construction, carry out the second layer (7) construction, its construction sequence is: first to the side pilot tunnel of interim median septum (5) 3. portion (11) excavate and supporting, treat pilot tunnel 3. portion (11) excavation and after supporting completes 10m, carry out pilot tunnel 4. portion (12) excavation and supporting; After treating the second layer (7) construction, carry out third layer (8) construction, its construction sequence is: after until pilot tunnel, 5. portion (13) excavation and supporting complete 10m, and carry out pilot tunnel 6. portion (14) excavation and supporting, every layer of pilot tunnel by that analogy below.
5. according to claim 1ly face upward cut construction method for City Subway Station under complex environment is attached, it is characterized in that: it is 4m ~ 6m that length is removed in the segmentation of described 4th step section gap dismounting method.
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Cited By (10)
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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 |
| CN106608491A (en) * | 2015-10-22 | 2017-05-03 | 中铁二局集团有限公司 | Adjustable conveying belt muck discharging method for high-slope-ratio entrance and exit channel |
| CN107420106A (en) * | 2017-08-08 | 2017-12-01 | 中铁六局集团有限公司 | The small spacing Under-cross tunnel excavation method in subway station and Under-cross tunnel excavation method |
| CN109339798A (en) * | 2018-10-19 | 2019-02-15 | 重庆大学 | One kind is for improving Core Soil release method in the construction of tunnel and Double side heading method |
| CN109372522A (en) * | 2018-11-27 | 2019-02-22 | 中铁隆工程集团有限公司 | Urban track traffic complexity overlapping tunnel construction method |
| CN109736843A (en) * | 2019-01-18 | 2019-05-10 | 北京市政路桥股份有限公司 | A kind of the inverse of two lining of small template assembly casting makees waterproof method |
| CN109736586A (en) * | 2018-12-14 | 2019-05-10 | 成都市建筑设计研究院 | A method of it abolishing existing underground station side wall and punches transformation |
| CN110295931A (en) * | 2019-06-18 | 2019-10-01 | 中国水利水电第十四工程局有限公司 | One kind being suitable for the method for dismounting of Shallow-buried longspan tunnel " well " font temporary support |
| CN113136893A (en) * | 2021-04-24 | 2021-07-20 | 浙江兴业市政工程有限公司 | Unitized construction method of underground connecting channel |
| CN113202499A (en) * | 2021-05-18 | 2021-08-03 | 中铁三局集团有限公司 | Construction method of long-distance high-lifting underground excavation tunnel |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106608491A (en) * | 2015-10-22 | 2017-05-03 | 中铁二局集团有限公司 | Adjustable conveying belt muck discharging method for high-slope-ratio entrance and exit channel |
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| CN107420106A (en) * | 2017-08-08 | 2017-12-01 | 中铁六局集团有限公司 | The small spacing Under-cross tunnel excavation method in subway station and Under-cross tunnel excavation method |
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| CN109372522A (en) * | 2018-11-27 | 2019-02-22 | 中铁隆工程集团有限公司 | Urban track traffic complexity overlapping tunnel construction method |
| CN109736586A (en) * | 2018-12-14 | 2019-05-10 | 成都市建筑设计研究院 | A method of it abolishing existing underground station side wall and punches transformation |
| CN109736843A (en) * | 2019-01-18 | 2019-05-10 | 北京市政路桥股份有限公司 | A kind of the inverse of two lining of small template assembly casting makees waterproof method |
| CN110295931A (en) * | 2019-06-18 | 2019-10-01 | 中国水利水电第十四工程局有限公司 | One kind being suitable for the method for dismounting of Shallow-buried longspan tunnel " well " font temporary support |
| CN113136893A (en) * | 2021-04-24 | 2021-07-20 | 浙江兴业市政工程有限公司 | Unitized construction method of underground connecting channel |
| CN113136893B (en) * | 2021-04-24 | 2022-06-17 | 浙江兴业市政工程有限公司 | Unitized construction method of underground connecting channel |
| CN113202499A (en) * | 2021-05-18 | 2021-08-03 | 中铁三局集团有限公司 | Construction method of long-distance high-lifting underground excavation tunnel |
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