CN103742191A - Water-rich tunnel pilot long-distance large-diameter precipitation channel and construction method thereof - Google Patents
Water-rich tunnel pilot long-distance large-diameter precipitation channel and construction method thereof Download PDFInfo
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- CN103742191A CN103742191A CN201410033986.2A CN201410033986A CN103742191A CN 103742191 A CN103742191 A CN 103742191A CN 201410033986 A CN201410033986 A CN 201410033986A CN 103742191 A CN103742191 A CN 103742191A
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Abstract
The invention relates to a water-rich tunnel pilot long-distance large-diameter precipitation channel and a construction method thereof. The pilot precipitation wells in existing water-rich tunnel construction easily interfere normal tunnel construction and influence construction progress. A long-distance pilot large-diameter circular pipe is used to form the precipitation channel at the bottom of a tunnel. Radial precipitation pipes are arranged on the side wall and the top plate of the precipitation channel, natural precipitation is performed by using the principle of water flowing, when the tunnel face construction reaches the 20cm range in front of a precipitation section, negative pressure is added to the precipitation pipes, and vacuum negative pressure precipitation is used. The water-rich tunnel pilot long-distance large-diameter precipitation channel has the advantages that under the water-rich condition, micro-shield traction is used, a pipe jacking equipment jacking method is used at the rear, fast construction is achieved, the construction is less prone to being influenced by underground water, when the precipitation channel is gotten through, the precipitation pipes are jacked for long-distance pilot precipitation, good precipitation effect is achieved, precipitation channel is applicable to underground project construction under water-rich conditions, in-hole construction interference is reduced, and construction progress is accelerated.
Description
Technical field
the invention belongs to traffic engineering technical field, be specifically related to a kind of rich water tunnel leading long-distance large-caliber precipitation passage and construction method thereof.
Background technology
Under rich water condition, as cementing containing pigment packsand a little less than tunnel, line peach level ground, orchid Chongqing Neogene system shale, diagenesis is poor, water stability extreme difference, by expert, be described as " rock inferior ", during without underground water, country rock resistance to overturning is better, but when underground water is grown, this type of sandstone through excavation disturbance, be subject to that water is long-time and infiltrate or soak after, country rock ruckbildung is obvious, in underground water enrichment location, also there is water burst, gush sand phenomenon in face, and after construction disturbance, substrate is powder fine sand shape more, substrate is softening, and arch and abutment wall distortion, convergence and slump slump phenomenon are serious.Traditional dewatering mode generally arranges leading dewatering well at face and carries out precipitation, can reduce face waterline, can make underground water have certain reducing to tunnel construction infection, but effect is not clearly, and tunnel limited space, in hole, face precipitation very easily disturbs tunnel normal construction, affects construction speed.
Summary of the invention
The object of this invention is to provide a kind of rich water tunnel leading long-distance large-caliber precipitation passage and construction method thereof, by tunnel bottom, grow the leading heavy caliber downcomer of distance and solve the problems of the technologies described above, effectively dewatering.
The technical solution adopted in the present invention is:
The leading long-distance large-caliber precipitation of rich water tunnel passage, is characterized in that:
Be vertically arranged with the precipitation overall channel that is positioned at inverted arch below, tubular, on precipitation overall channel tube wall, at interval of the protruding some downcomers of a segment distance, every row's downcomer, all in same cross section, distributes radially;
The header of the circular arc arranging in downcomer port access precipitation overall channel, the arc end part of the header both sides drain header that also access longitudinally arranges downwards;
Drain header downstream end is provided with negative pressure of vacuum pump.
Downcomer port is by connecting hose access set water pipe.
Precipitation overall channel is comprised of the prefabricated pipe splicing of more piece.
The construction method of the leading long-distance large-caliber precipitation of rich water tunnel passage, is characterized in that:
By following steps, realized:
Step 1: before the positive hole of tunnel advances, head into precipitation overall channel by miniature shield machine and pipe jacking equipment merogenesis below inverted arch design attitude, make precipitation overall channel longitudinally arrange completely;
Step 2: utilize small-sized geological drilling rig pore-forming radially on the tube wall of precipitation overall channel, adopt jack becoming hole site to head into downcomer; Downcomer is at interval of a segment distance setting, and every row's downcomer, all in same cross section, distributes radially;
Step 3: the correspondence position at precipitation overall channel inside, downcomer port arranges the header of circular arc, downcomer port is by connecting hose access set water pipe, the arc end part of the header both sides drain header that also access longitudinally arranges downwards, drain header downstream end is provided with negative pressure of vacuum pump;
Step 4: after the propelling construction of positive hole, be advanced into apart from before precipitation section during 20m, open negative pressure of vacuum pump and carry out negative pressure of vacuum precipitation;
Step 5: when positive every propelling one segment distance in hole meets with certain row's downcomer, continue propelling after removing this row's downcomer.
In step 2, downcomer is segmented in the pore-forming that heads into precipitation overall channel.
The present invention has the following advantages:
Precipitation method of the present invention, under rich water condition, by the miniature shield structure traction of miniature shield structure, rear adopts pipe jacking equipment to head into method, speed of application is exceedingly fast, and be not subject to the impact of underground water, get through after precipitation passage, head into downcomer and grow the leading precipitation of distance, dewatering effect is good, construction speed is fast, is applicable to the underground engineering construction under rich water condition, and construction is disturbed little.
Accompanying drawing explanation
Fig. 1 is leading long-distance large-caliber precipitation passage cross section arrangement diagram.
Fig. 2 is leading long-distance large-caliber precipitation passage construction schematic diagram.
Fig. 3 is radial downcomer construction schematic diagram.
Fig. 4 is downcomer connection diagram.
In figure, 1-precipitation overall channel, 2-miniature shield machine, 3-pipe jacking equipment, 4-jack, 5-downcomer, 6-header, 7-connecting hose, 8-drain header, 9-negative pressure of vacuum pump.
The specific embodiment
Below in conjunction with the specific embodiment, the present invention will be described in detail.
The leading long-distance large-caliber of the rich water tunnel of one (diameter 1.8m left and right involved in the present invention, be convenient to constructing operation in pipe of artificial later stage) precipitation passage, before the propelling construction of positive hole, tunnel, perform in advance, be vertically arranged with the precipitation overall channel 1 that is positioned at inverted arch below, tubular, the prefabricated pipe splicing of more piece, consisting of, is the circular channel of long-distance large-caliber.On precipitation overall channel 1 tube wall at interval of the protruding some downcomer 5(of a segment distance (every 5m arrange 1 section) as arranged five in Fig. 4), every row's downcomer 5(downcomer length 7 ~ 12m, specifically can determine according to tunnel excavation outline line) all in same cross section, distribute radially.Downcomer 5 ports access the header 6 of the circular arc of precipitation overall channel 1 interior setting by connecting hose 7, the arc end part of the header 6 both sides drain header 8 that also access longitudinally arranges downwards.Drain header 8 downstream ends are provided with negative pressure of vacuum pump 9.
The construction method of the leading long-distance large-caliber precipitation of above-mentioned rich water tunnel passage, is realized by following steps:
Step 1: before the positive hole of tunnel advances, head into precipitation overall channel 1 by miniature shield machine 2 and pipe jacking equipment 3 merogenesis below inverted arch design attitude, make precipitation overall channel 1 longitudinally arrange completely.
Step 2: utilize small-sized geological drilling rig pore-forming radially on the tube wall of precipitation overall channel 1, adopt jack 4 becoming hole site to head into downcomer 5; Downcomer 5 is at interval of a segment distance setting, and every row's downcomer 5, all in same cross section, distributes radially.
The length of downcomer 5 is according to the area definition that needs precipitation, and longitudinal pitch is determined according to water yield size and country rock transmission coefficient.Longer downcomer 5 sectionals head in the pore-forming of precipitation overall channel 1.
Step 3: in precipitation overall channel 1 inside, the correspondence position of downcomer 5 ports arranges the header 6 of circular arc, downcomer 5 ports are by connecting hose 7 access set water pipes 6, the arc end part of the header 6 both sides drain header 8 that also access longitudinally arranges downwards, drain header 8 downstream ends are provided with negative pressure of vacuum pump 9.
Step 4: after the propelling construction of positive hole, be advanced into apart from before precipitation section during 20m, open negative pressure of vacuum pump 9 and carry out negative pressure of vacuum precipitation.
Step 5: when positive every propelling one segment distance in hole and certain row's downcomer 5 meet, remove the rear continuation of this row's downcomer 5 and advance.
It is cited that content of the present invention is not limited to embodiment, and the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading manual of the present invention, is claim of the present invention and contains.
Claims (5)
1. the leading long-distance large-caliber precipitation of rich water tunnel passage, is characterized in that:
Be vertically arranged with the precipitation overall channel (1) that is positioned at inverted arch below, tubular, on precipitation overall channel (1) tube wall, at interval of the protruding some downcomers of segment distance (5), every row's downcomer (5), all in same cross section, distributes radially;
The header (6) of the circular arc arranging in downcomer (5) port access precipitation overall channel (1), the arc end part of header (6) the both sides drain header (8) that also access longitudinally arranges downwards;
Drain header (8) downstream end is provided with negative pressure of vacuum pump (9).
2. the leading long-distance large-caliber precipitation of rich water tunnel according to claim 1 passage, is characterized in that:
Downcomer (5) port is by connecting hose (7) access set water pipe (6).
3. the leading long-distance large-caliber precipitation of rich water tunnel according to claim 2 passage, is characterized in that:
Precipitation overall channel (1) is comprised of the prefabricated pipe splicing of more piece.
4. the construction method of the leading long-distance large-caliber precipitation of rich water tunnel passage, is characterized in that:
By following steps, realized:
Step 1: before the positive hole of tunnel advances, head into precipitation overall channel (1) by miniature shield machine (2) and pipe jacking equipment (3) merogenesis below inverted arch design attitude, make precipitation overall channel (1) longitudinally arrange completely;
Step 2: utilize small-sized geological drilling rig pore-forming radially on the tube wall of precipitation overall channel (1), adopt jack (4) becoming hole site to head into downcomer (5); Downcomer (5) is at interval of a segment distance setting, and every row's downcomer (5), all in same cross section, distributes radially;
Step 3: correspondence position inner at precipitation overall channel (1), downcomer (5) port arranges the header (6) of circular arc, downcomer (5) port is by connecting hose (7) access set water pipe (6), the arc end part of header (6) the both sides drain header (8) that also access longitudinally arranges downwards, drain header (8) downstream end is provided with negative pressure of vacuum pump (9);
Step 4: after the propelling construction of positive hole, be advanced into apart from before precipitation section during 20m, open negative pressure of vacuum pump (9) and carry out negative pressure of vacuum precipitation;
Step 5: when positive every propelling one segment distance in hole and certain row's downcomer (5) meet, remove rear continuation of this row's downcomer (5) and advance.
5. the construction method of the leading long-distance large-caliber precipitation of rich water tunnel according to claim 4 passage, is characterized in that:
In step 2, downcomer (5) is segmented in the pore-forming that heads into precipitation overall channel (1).
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| CN201410033986.2A CN103742191B (en) | 2014-01-24 | 2014-01-24 | Rich water tunnel advanced long-distance large-caliber precipitation passage and construction method thereof |
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| CN201410033986.2A CN103742191B (en) | 2014-01-24 | 2014-01-24 | Rich water tunnel advanced long-distance large-caliber precipitation passage and construction method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104532864A (en) * | 2014-12-11 | 2015-04-22 | 中铁十九局集团有限公司 | Advanced Radial Precipitation Channel System and Advanced Radial Precipitation Method |
| CN105484791A (en) * | 2016-01-16 | 2016-04-13 | 中铁十九局集团第二工程有限公司 | Comprehensive tunnel drainage, precipitation and pressure reduction construction method |
| CN106168142A (en) * | 2016-08-24 | 2016-11-30 | 中国神华能源股份有限公司 | The water discharge method of tunnel bedrock underground water |
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| CN103334770A (en) * | 2013-06-09 | 2013-10-02 | 中铁隧道集团有限公司 | Construction method of superhigh water pressure water-affluent crushed zones of long-large counter-slope tunnels |
| CN103470267A (en) * | 2013-09-28 | 2013-12-25 | 中铁二十局集团第二工程有限公司 | Long tunnel fast construction process |
| CN203685290U (en) * | 2014-01-24 | 2014-07-02 | 中铁第一勘察设计院集团有限公司 | Advanced long-distance large-caliber precipitation channel for tunnel rich in water |
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| JPH08135399A (en) * | 1994-11-02 | 1996-05-28 | Sekisui Jushi Co Ltd | Water conducting construction method in tunnel |
| JP2010095977A (en) * | 2008-10-20 | 2010-04-30 | Ohbayashi Corp | Drainage structure for underground water, and construction method for tunnel having the same |
| CN101435342A (en) * | 2008-12-22 | 2009-05-20 | 长安大学 | Tunnel ring direction drainpipe equipped with strip heat-insulating layer |
| CN201650362U (en) * | 2010-03-17 | 2010-11-24 | 中铁隧道勘测设计院有限公司 | Maintainable tunnel drainage system |
| CN102661172A (en) * | 2012-05-09 | 2012-09-12 | 中铁隧道集团有限公司 | Advanced precipitation method for deep-buried tunnel |
| CN103032097A (en) * | 2012-12-26 | 2013-04-10 | 湖南省交通规划勘察设计院 | Tunnel drainage structure applicable to water-rich strata under unsymmetrical pressure and construction method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104532864A (en) * | 2014-12-11 | 2015-04-22 | 中铁十九局集团有限公司 | Advanced Radial Precipitation Channel System and Advanced Radial Precipitation Method |
| CN104532864B (en) * | 2014-12-11 | 2016-07-06 | 中铁十九局集团有限公司 | Advanced radial precipitation channel system and advanced radial precipitation method |
| CN105484791A (en) * | 2016-01-16 | 2016-04-13 | 中铁十九局集团第二工程有限公司 | Comprehensive tunnel drainage, precipitation and pressure reduction construction method |
| CN105484791B (en) * | 2016-01-16 | 2018-08-21 | 中铁十九局集团第二工程有限公司 | A kind of synthesis sluicings of tunnel, depressurizes construction method at precipitation |
| CN106168142A (en) * | 2016-08-24 | 2016-11-30 | 中国神华能源股份有限公司 | The water discharge method of tunnel bedrock underground water |
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| CN103742191B (en) | 2015-09-02 |
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