CN102966358B - Construction method for shield-cut reinforced concrete pile under main line of operational railway - Google Patents
Construction method for shield-cut reinforced concrete pile under main line of operational railway Download PDFInfo
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- CN102966358B CN102966358B CN201210451004.2A CN201210451004A CN102966358B CN 102966358 B CN102966358 B CN 102966358B CN 201210451004 A CN201210451004 A CN 201210451004A CN 102966358 B CN102966358 B CN 102966358B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a shield construction method, and particularly discloses a construction method for a shield-cut reinforced concrete pile under a main line of an operational railway. The construction method comprises the steps of preparation prior to construction, tool configuration prior to construction, setting of construction parameters prior to cutting and shield cutting/tunneling. By adopting the steps of preparation prior to construction and tool configuration prior to construction, in particular the step of setting of the construction parameters, shield cutting of the reinforced concrete pile under the main line of the operational railway can be realized successfully, no impact can be caused on the main line of the railway, the operational safety of the railway can be ensured, the effectiveness of shield construction can be ensured effectively, and the tool wear can be reduced.
Description
Technical field
The invention belongs to Shield Construction Technique field, particularly the construction method of a kind of railway in operation main track below shield structure Cutting Steel rib concrete pile.
Background technology
Along with the encryption of city underground gauze and the increase of tunnel quantity, Underground Space Resource is reducing gradually, and the position in tunnel will be subject to being permitted multifactorial restriction.The distributions such as the underground in-service and discarded pipeline in each metropolis, foundation pile, structure " have a large capacity and a wide range ", form the underground obstacle of existing shield tunnel construction, increase the difficulty of construction.
In shield-tunneling construction, the conventional disposal technology that runs into obstruction is mainly to remove in advance or tunnel line change by front at shield structure abroad, but this construction method has increased difficulty of construction, is of limited application.If directly cutting, shield structure in the time passing through underground obstacle, if thrust control is improper, the likely pile foundation formation " boulder " that fractures before not grinding." boulder " easily rolls and is difficult to fragmentation, likely causes shield machine to move on, and more serious will cause surface collapse, and serious accident occurs.
Therefore; develop a kind of shield construction method of direct Cutting Steel reinforced concrete obstruction; especially there is main object of protection in earth's surface, as the shield construction method of the direct Cutting Steel reinforced concrete obstruction of railway in operation main track, is this area technical barrier urgently to be resolved hurrily.
Summary of the invention
Main purpose of the present invention is for above-mentioned problems of the prior art, and the construction method of a kind of railway in operation main track below shield structure cutting concrete pile is provided.
In order to realize foregoing invention object, the technical solution used in the present invention is as follows:
The construction method of railway in operation main track below shield structure Cutting Steel rib concrete pile, comprises the steps:
(1) before construction, prepare, comprising: 1. reinforced concrete pile location; 2. railway main track settlement Control standard survey;
(2) cutter configuration before construction
Shield structure periphery serrated knife is amounted to 9, be replaced by hobboing cutter by " tool changing with pressure " construction method;
(3) before cutting, construction parameter is set
Shield driving, tunnels to before reinforced concrete pile, carries out following construction parameter setting:
I. support pressure is 2.0～2.2bar;
II. shield driving speed 2～3mm/min;
III. cutterhead rotating speed 0.5～0.8rpm;
IV. according to cutterhead rotating speed and fltting speed, gross thrust and moment of torsion are controlled automatically according to shield machine, described maximum thrust≤2500T;
V. default shield structure pressure-retaining system, the composite bentonite slurries that are 35s to native storehouse pressure injection viscosity, ensure be positioned at ± 0.1bar of support pressure fluctuation;
VI. sediment improvement, adopt the composite bentonite slurries that viscosity is 35s, described sediment improvement addition is the composite bentonite slurries addition of shield structure pressurize;
VII. the every ring adding amount of shield tail grease is 80～100 ㎏;
VIII. the every ring of cutterhead seal grease addition is no less than 45 ㎏;
IX. synchronous grouting, every ring synchronous grouting amount is 7.1m
3, grouting pressure is 4.5bar;
X. secondary grouting, adopt biliquid slurry, described biliquid slurry is made up of by the weight ratio of 1:0.06:0.8 cement, water glass and water;
XI. excavation soil layer loss≤5 ‰, amount≤39.03m is unearthed
3;
(4) shield structure cutting driving
Keep the described construction parameter of step (3), shield structure, along design route axis driving, carries out synchronous grouting when Cutting Steel rib concrete pile, after crossing stake, carry out secondary grouting, and carry out earth's surface monitoring at any time, in the time of be positioned at ± 2mm of ground settlement, stop secondary grouting, continue driving until complete cutting.
The construction method of railway in operation main track of the present invention below shield structure Cutting Steel rib concrete pile, comprise before construction prepare, construction parameter is set and shield structure cutting driving step before cutter configuration before construction, cutting, particularly, (1) location of the reinforced concrete pile before first constructing and railway main track settlement Control standard survey, to understand in detail pile body and construction environment situation, thereby determine construction parameter according to investigation.According to inventor's investigation, Chinese Railway main track settlement Control standard is: 1. rail track uplift capacity≤2mm per hour; Settling amount≤4mm per hour; 2. often add up round the clock uplift capacity≤4mm, often add up round the clock settling amount≤10mm; 3. the two top-of-rail level discrepancy in elevation≤2mm, the accumulative total uplift capacity≤10mm of final circuit in half a year, accumulative total sedimentation≤40mm.(2) configuration of the cutter before construction, amounts to shield structure periphery serrated knife to 9, is replaced by hobboing cutter by " tool changing with pressure " construction method.(3) shield driving, when tunneling to before reinforced concrete pile, carries out construction parameter setting.The present invention is by default construction parameter success, and by the cooperation between each parameter, successfully realized that shield structure directly cuts and not match line railway impact.(4) keep the described construction parameter of step (3), shield structure tunnels along design route axis, when Cutting Steel rib concrete pile, carry out synchronous grouting, after crossing stake, carry out secondary grouting, and carry out at any time earth's surface monitoring, in the time of be positioned at ± 2mm of ground settlement, stop secondary grouting, continue driving until complete cutting.
As preferably, the construction method of aforementioned railway in operation main track below shield structure Cutting Steel rib concrete pile, synchronous slurries are grouped into by following one-tenth described in the IX of step (3):
Every side's unit weight 1810 ㎏ of described synchronous slurries, described fine sand modulus is 1.6～2.2, described synchronous slurry consistency is 120mm.
By the composition of preferably synchronous slurries, can effectively ensure synchronous grouting effect, thereby further ensure the successful implementation of shield structure cutting.
As further preferred, the construction method of aforementioned railway in operation main track below shield structure Cutting Steel rib concrete pile, described synchronous slurries are formulated as follows: mixing formula ratio sodium bentonite 30min, drop into formula ratio fine sand, II level flyash and water again and carry out mixing, described total mixing time is no less than 50min.
As preferably, the construction method of aforementioned railway in operation main track below shield structure Cutting Steel rib concrete pile, excavates soil layer described in the XI of step (3) and should take to owe to dig, and makes the shield structure otch top soil body have the protuberance that is not more than 0.5mm.
By taking to owe excavation method, and ensure that the shield structure otch top soil body has the protuberance that is not more than 0.5mm, can effectively offset the posterior settlement amount of the part soil body, ensured the successful implementation of cutting construction.
As preferably, the construction method of aforementioned railway in operation main track below shield structure Cutting Steel rib concrete pile, in the described shield structure cutting of step (4) tunneling process, takes under-voltage being unearthed.Particularly, can, by controlling the opening degree of the unearthed speed of conveying worm and soil outlet, realize under-voltage being unearthed.
In shield structure cutting tunneling process, by taking under-voltage being unearthed, can form soil plug at soil outlet, play good sealing, pressurize and blowout prevention effect.In the time stopping driving or emergency occurs, should close immediately conveying worm soil outlet gate.
In shield structure cutting tunneling process, should observe at any time conveying worm soil outlet state of soil.When finding to be unearthed rarely, should stop shield driving, take out earth sample, analyze, adjust described composite bentonite slurries injection rate to setup parameter scope.
In shield structure cutting tunneling process, if find, the reinforcing bar that screw machine is blended blocks, and can select following three kinds of modes to process: a, rotating screw machine, make its loosening Tu Cang that returns continue to stir that mixes after 5 minutes recovery with earth unearthed; B, utilize screw machine to drive telescopic system, front and back are slowly flexible, reduce screw machine driving torque; If c screw machine is stuck, first by screw machine closing gate, open emergent peep hole on screw machine by professional, check, then take specific aim measure to process.
Shield machine of the present invention, adopts earth pressure balance weak soil shield machine.
Compared with prior art, the invention has the beneficial effects as follows:
(1) the conventional shield structure in this area in front and periphery adopt serrated knife, this type of cutter can play the effect that reduces tool wear in weak soil, but for Cutting Steel rib concrete pile without advantage, the present invention is by the cutter configuration before constructing, can effective broken steel concrete, and do not destroy the configured in one piece theory of cutterhead weak soil driving, follow-up weak soil driving is protected.
(2) the present invention is by carrying out the selection of construction parameter and cooperatively interacted before cutting, and keeps default construction parameter in driving, successfully realized the shield structure cutting construction of railway in operation main track below reinforced concrete pile.After having constructed, main track accumulative total sedimentation-0.7 is to+2.3mm scope, and match line railway does not impact, and has ensured that it normally moves, and similar construction is had to great dissemination.
Detailed description of the invention
Below in conjunction with detailed description of the invention, foregoing invention content of the present invention is described in further detail.
But this should be interpreted as to the scope of the above-mentioned theme of the present invention only limits to following embodiment.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and customary means, make various replacements and change, all should comprise within the scope of the invention.
Embodiment 1 the present embodiment is the construction method of the railway in operation main track below shield structure Cutting Steel rib concrete pile at station, interval shield structure city, Hangzhou Subway Line 1 Qiu Tao way station to station, station, city.
Under the railway of station, interval shield structure city, Hangzhou Subway Line 1 Qiu Tao way station to station, station, city, pass through useless stake, stake comprises two types, and one is the discarded stake of station, city in 1999 transformation, and one is the newly-increased stake of station, city transformation recently.The stake that shield structure need pass through amounts to three rows, and first row, the second waste discharge stake are that city in 2009 station dilatation is left over, and within the scope of shield structure, useless stake stake footpath 1m, adopts C30 plain concrete to build, 2m under stake long 20m(tunnel), the full section in tunnel passes through.The 3rd campshed is that city in 1999 station dilatation is left over, and is stake footpath 1m deposited reinforced concrete pile, stake long 20 meters (1.3m under tunnel), and C40 concrete, maximum main muscle is Φ 18,20 every.The sampling maximum intensity of loosing core 45Mpa.Left line 4.17m, right line 0.04m are invaded in useless stake.
3 campsheds are overhead waiting hall bottom, station, city walkway fender post, existing all in overhead waiting hall bottom.The first campshed is positioned at railway the 11 below, station track, and the second campshed is positioned at below, stereotyped writing road, and the 3rd waste discharge is abandoned stake and is positioned at railway the 5th below, station track.Wherein the 5th, stereotyped writing road is that hair line is arrived at station, 11 station tracks are parking line.
Passing through a region, tunnel top buried depth 12.540-14.007m, mainly passes through soil layer for 3. 6 layers of sandy silt.Running tunnel is crossed useless stake region circuit in R=800m radius curve, the interval gradient 25 ‰.
Adopt with the following method, carry out the cutting of shield structure:
(1) before construction, prepare, comprising: 1. reinforced concrete pile location; 2. railway main track settlement Control standard survey;
Reinforced concrete pile location situation is as aforementioned.Railway main track settlement Control standard survey is as aforementioned, i.e. 1. rail track uplift capacity≤2mm per hour; Settling amount≤4mm per hour; 2. often add up round the clock uplift capacity≤4mm, often add up round the clock settling amount≤10mm; 3. the two top-of-rail level discrepancy in elevation≤2mm, the accumulative total uplift capacity≤10mm of final circuit in half a year, accumulative total sedimentation≤40mm.
(2) cutter configuration before construction
Shield structure periphery serrated knife is amounted to 9, be replaced by hobboing cutter by " tool changing with pressure " construction method;
(3) before cutting, construction parameter is set
Shield driving, tunnels to before reinforced concrete pile, carries out following construction parameter setting:
I. support pressure is 2.0～2.2bar;
II. shield driving speed 2～3mm/min;
III. cutterhead rotating speed 0.5～0.8rpm;
IV. according to cutterhead rotating speed and fltting speed, gross thrust and moment of torsion are controlled automatically according to shield machine, described maximum thrust≤2500T;
V. default shield structure pressure-retaining system, the composite bentonite slurries that are 35s to native storehouse pressure injection viscosity, ensure be positioned at ± 0.1bar of support pressure fluctuation;
VI. sediment improvement, adopt the composite bentonite slurries that viscosity is 35s, described sediment improvement addition is the composite bentonite slurries addition of shield structure pressurize;
VII. the every ring adding amount of shield tail grease is 80～100 ㎏;
VIII. the every ring of cutterhead seal grease addition is no less than 45 ㎏;
IX. synchronous grouting, every ring synchronous grouting amount is 7.1m
3, grouting pressure is 4.5bar;
Synchronous slurries are grouped into by following one-tenth: fine sand 900 ㎏/m
3, II level flyash 400 ㎏/m
3, sodium bentonite 40 ㎏/m
3, water 600 ㎏/m
3; Synchronous every side's unit weight 1810 ㎏ of slurries, described fine sand modulus is 1.6～2.2, stating synchronous slurry consistency is 120mm.
Synchronous slurries are formulated as follows: mixing formula ratio sodium bentonite 30min, then drop into formula ratio fine sand, II level flyash and water and carry out mixing, described total mixing time 70min.
X. secondary grouting, adopt biliquid slurry, described biliquid slurry is made up of by the weight ratio of 1:0.06:0.8 cement, water glass and water;
XI. excavation soil layer loss≤5 ‰, amount≤39.03m is unearthed
3; Take to owe to dig, make the shield structure otch top soil body have the protuberance that is not more than 0.5mm;
(4) shield structure cutting driving
Keep the described construction parameter of step (3), shield structure, along design route axis driving, carries out synchronous grouting when Cutting Steel rib concrete pile, after crossing stake, carry out secondary grouting, and carry out earth's surface monitoring at any time, in the time of be positioned at ± 2mm of ground settlement, stop secondary grouting, continue driving until complete cutting; In shield structure cutting tunneling process, take under-voltage being unearthed.
Construction effect: (1), in work progress, shield driving speed remains on 3mm/min substantially, has ensured shield-tunneling construction work efficiency; (2), in the process of passing through reinforced concrete pile, reinforcing bar cutting is very thorough, is mono-section of 10-30cm substantially; (3) be unearthed and machine operation normal, not to construction impact; (4), after having constructed, the good settlement Control of accumulative total-0.7 to+2.3mm, has guaranteed railway operation safety; (5) arrival is observed cutterhead after receiving, and cutterhead is intact, and tool wear is lighter.
Claims (5)
1. the construction method of railway in operation main track below shield structure Cutting Steel rib concrete pile, is characterized in that, comprises the steps:
(1) before construction, prepare, comprising: 1. reinforced concrete pile location; 2. railway main track settlement Control standard survey;
(2) cutter configuration before construction
Shield structure periphery serrated knife is amounted to 9, be replaced by hobboing cutter by " tool changing with pressure " construction method;
(3) before cutting, construction parameter is set
Shield driving, tunnels to before reinforced concrete pile, carries out following construction parameter setting:
I. support pressure is 2.0～2.2bar;
II. shield driving speed 2～3mm/min;
III. cutterhead rotating speed 0.5～0.8rpm;
IV. according to cutterhead rotating speed and fltting speed, gross thrust and moment of torsion are controlled automatically according to shield machine, maximum thrust≤2500T;
V. default shield structure pressure-retaining system, the composite bentonite slurries that are 35s to native storehouse pressure injection viscosity, ensure be positioned at ± 0.1bar of support pressure fluctuation;
VI. sediment improvement, adopt the composite bentonite slurries that viscosity is 35s, sediment improvement addition is the composite bentonite slurries addition of shield structure pressurize;
VII. the every ring adding amount of shield tail grease is 80～100 ㎏;
VIII. the every ring of cutterhead seal grease addition is no less than 45 ㎏;
IX. synchronous grouting, every ring synchronous grouting amount is 7.1m
3, grouting pressure is 4.5bar;
X. secondary grouting, adopt biliquid slurry, described biliquid slurry is made up of by the weight ratio of 1:0.06:0.8 cement, water glass and water;
XI. excavation soil layer loss≤5 ‰, amount≤39.03m is unearthed
3;
(4) shield structure cutting driving
Keep the described construction parameter of step (3), shield structure, along design route axis driving, carries out synchronous grouting when Cutting Steel rib concrete pile, after crossing stake, carry out secondary grouting, and carry out earth's surface monitoring at any time, in the time of be positioned at ± 2mm of ground settlement, stop secondary grouting, continue driving until complete cutting.
2. the construction method of railway in operation main track according to claim 1 below shield structure Cutting Steel rib concrete pile, is characterized in that, the synchronous slurries of IX of step (3) are grouped into by following one-tenth:
Synchronous every side's unit weight 1810 ㎏ of slurries, fine sand modulus is 1.6～2.2, synchronous slurry consistency is 120mm.
3. the construction method of railway in operation main track according to claim 2 below shield structure Cutting Steel rib concrete pile, it is characterized in that, described synchronous slurries are formulated as follows: mixing formula ratio sodium bentonite 30min, drop into formula ratio fine sand, II level flyash and water again and carry out mixing, total mixing time is no less than 50min.
4. the construction method of railway in operation main track according to claim 1 below shield structure Cutting Steel rib concrete pile, is characterized in that, excavates soil layer described in the XI of step (3) should take to owe to dig, and makes the shield structure otch top soil body have the protuberance that is not more than 0.5mm.
5. the construction method of railway in operation main track according to claim 1 below shield structure Cutting Steel rib concrete pile, is characterized in that, in the described shield structure cutting of step (4) tunneling process, takes under-voltage being unearthed.
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| CN104653186A (en) * | 2013-11-25 | 2015-05-27 | 天津城建隧道股份有限公司 | Method of earth pressure balance shield crossing reinforced concrete pile foundation building |
| CN103670429B (en) * | 2013-11-29 | 2016-01-20 | 北京交通大学 | A kind of shield structure directly cuts the knife disc tool Enhancement Method of steel bar concrete pile |
| CN103696778B (en) * | 2013-12-23 | 2015-07-08 | 北京交通大学 | Pile cutting cutter amount determination method capable of realizing equal abrasion |
| CN103899323B (en) * | 2014-05-06 | 2016-01-27 | 中铁二十五局集团轨道交通工程有限公司 | A kind of construction method of shield crossing rail yard |
| CN104594912A (en) * | 2014-11-21 | 2015-05-06 | 北京城建设计发展集团股份有限公司 | Method for grinding and penetrating through pile groups through shield tunneling machine |
| CN105065011A (en) * | 2015-08-05 | 2015-11-18 | 上海隧道工程有限公司 | Construction method of soft soil shield tunneling cutting pile foundation |
| CN108915709A (en) * | 2018-05-29 | 2018-11-30 | 中铁隧道集团二处有限公司 | A kind of slurry shield of area near a river cuts the construction method of existing bridge single-pile foundation |
| CN111156010B (en) * | 2020-01-10 | 2021-06-08 | 中铁隧道局集团有限公司 | Construction method for shield of expansion soil layer to penetrate through existing train station house |
| CN112901176B (en) * | 2020-12-24 | 2023-01-31 | 南昌轨道交通集团有限公司 | Shield tunneling machine passing method capable of reducing disturbance |
| CN112983446A (en) * | 2021-04-22 | 2021-06-18 | 中铁一局集团第二工程有限公司 | Construction method for shield cutting of existing station reinforced concrete fender post |
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Effective date of registration: 20160104 Address after: Jinniu District Kam Tong Road Chengdu city Sichuan province 610031 No. 16 Patentee after: CHINA RAILWAY NO.2 BUREAU ENGINEERING CO., LTD. Address before: 610041, No. nine, No. 156, building B, high building, Xing Xing Road, Chengdu hi tech Zone, Sichuan Patentee before: China Railway Erju Co., Ltd. |
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Address after: No. 16, Jinniu District Road, Jinniu District Road, Chengdu, Sichuan Patentee after: China Railway No. 2 Engineering Group Co., Ltd. Address before: No. 16, Jinniu District Road, Jinniu District Road, Chengdu, Sichuan Patentee before: CHINA RAILWAY NO.2 BUREAU ENGINEERING CO., LTD. |
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