CN104912560A - Small-radius shield curve launching construction technology on gravel clay layer - Google Patents
Small-radius shield curve launching construction technology on gravel clay layer Download PDFInfo
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- CN104912560A CN104912560A CN201510316360.7A CN201510316360A CN104912560A CN 104912560 A CN104912560 A CN 104912560A CN 201510316360 A CN201510316360 A CN 201510316360A CN 104912560 A CN104912560 A CN 104912560A
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Abstract
A small-radius shield curve launching construction technology on a gravel clay layer relates to the technology of construction processes on a gravel clay layer, and comprises the following steps: 1, selecting a launching path; 2, reinforcing launching end stratum; 3, chiseling off a launching end portal; 4, mounting the launching end portal in a sealing manner; 5, mounting a launching base; 6, splicing partial segments; 7, mounting a reaction frame; and 8, controlling the shield curve launching posture. The small-radius shield curve launching construction technology is simple in process and reasonable in design, ensures continuous normal working of a shield, guarantees the launching quality and the tunnel construction progress and security and improves the economical benefits.
Description
Technical field:
The present invention relates to gravel clay layer construction technology technology, be specifically related to a kind of gravel clay layer small-radius shield curve and start construction technology.
Background technology:
General shield launching is at straight line or mild wet air oxidation, the curved section of below radius 500m start can not guarantee shield structure continuously normal by non-earth pressure balance status transition to earth pressure balance state, and in work progress, easily cause reaction frame, negative endless tube sheet unbalance stress, reaction frame is caused to be out of shape excessive, the negative phenomenons such as endless tube sheet breaks, misalignment of axe is excessive, impact is started quality, and then affects the progress of constructing tunnel, safety and economic benefit.
Summary of the invention:
The object of this invention is to provide gravel clay layer small-radius shield curve to start construction technology, its technique is simple, reasonable in design, ensure that shield structure works continuously normally, ensure that the quality that starts, ensure that Tunnel Construction Schedule, safety, improve economic benefit.
In order to solve the problem existing for background technology, the present invention is by the following technical solutions: its construction technology is as follows:
One, originating path is selected: reasonable computation reaction frame, angle between pedestal and portal, ensure that the distance of each point distance tunnel center line on shield machine disengaging pedestal anterior shield structure arbor line extended line is not more than 50mm, be placed on start on pedestal owing to entering hole anterior shield structure, control shield machine with shield structure base position during construction and enter hole attitude, shield machine seat center line and tunnel center line the North spacing 50-60mm, south 400-420mm, support center line is outside tunnel center line, and base central line front end is apart from side wall 480-510mm;
Two, starting end head stratum consolidation: adopt triple-pipe high pressure jet grouting stake to reinforce, rotary churning pile jumps stake every applying work, stake footpath φ 800-600mm, and occlusion 200mm, pore-forming is 18.5-18.9m, and its hollow hole is 6.5-6.8m.Adopt core-drill(ing) machine to get core in hole scope internal drilling after reinforcing, measure its intensity and transmission coefficient to ensure its consolidation effect;
Three, starting end head portal cuts: adopt pneumatic pick artificial chisel to remove, cutting principle is reasonable piecemeal, cut fast, guarantee safety, after portal is all abolished, shield machine rapid top hole driving face, carries out pressurization driving immediately after shield structure injection work plane, the external diameter that portal is abolished is decided to be φ 6500-6800mm, and left and right line respectively need cut 5.5;
Four, the portal that starts sealing is installed: adopt conventional rubber curtain plate sealing means, portal slip casting adopts shield synchronization slip casting device pouring-in, not independent built-in slip casting pipe, should in advance rubber cord bolt be hung on the pre-buried steel loop in hole before driving, and be fixed with keeper plate of steel, rubber cord and fan steel plate head into and inside curved rubber cord by the housing of shield machine;
Five, the pedestal that starts is installed: adopt steel work, its center line is positioned at the outside of Tunnel Design center line, and be namely on the extended line in shield launching path, its gradient is consistent with the Tunnel Design gradient
[8], but raised 25mm than design altitude, pedestal welds with the built-in fitting at the bottom of starting well tunnel securely, and establishes bracing members in side, to guarantee its not slippage when shield launching;
Six, negative ring pipe sheet assembling: adopt closed loop section of jurisdiction, and carry out assembled according to the normal installed position in shield shell.Before the negative endless tube sheet of installation, for ensureing that negative endless tube sheet does not destroy the sealing brush of shield machine afterbody, ensure that negative endless tube sheet well can advance assembled later smoothly backward, fill plug seal grease in tail sealing brush, be not worn to protect tail sealing brush, first ring is born after endless tube sheet is assembled into, and moves after completing section of jurisdiction with 4 ~ 5 groups of jack;
Seven, reaction frame is installed: employing be the combined steel framed structure with sufficient intensity and rigidity, by maximum counter-force 3200t design during shield launching, and consider inhomogeneities and the least favorable factor of this counter-force;
Eight, shield structure curve starts gesture stability: during shield launching, its hinge angle is zero, shield structure central axis is positioned at the outside of Tunnel Design center line, namely be on the extended line in shield launching path, its gradient is consistent with the Tunnel Design gradient, but has raised 25mm than design altitude; Attitude shield structure before shield structure leaves pedestal is basic along predetermined originating path straight ahead before leaving the pedestal that starts, if desired by coming the selection of propelling jack to do trace adjustment to shield attitude, shield structure must cut portal reinforcing body during this period, with at a slow speed, low pressure for advancing principle, to guarantee the stable of shield attitude.Be 0.08MPa in shield machine working shaft shield launching place soil pressure as calculated, reinforce when section advances and increase to about 0.08MPa gradually by 0, and according to ground monitoring feedack, soil pressure setting value is adjusted in time.Control fltting speed according to cutter head torque, cutter head torque controls below 70%; Shield tail leaves pedestal backing structure and has been in state relatively freely, generally adjusts shield attitude by the reasonable selection of shield driving jack and hinge function adjusts, and progressively advances along Tunnel Design axis to make shield structure.
The start base central axis of gesture stability of described shield structure curve is consistent with the central axis tangent line in tunnel, the parallel propelling of shield machine; During processing reaction frame, carefully must adjust the supporting capacity of reaction frame; The axis of shield tunnel must be released accurately when reaction frame is installed.
The assembled change will noting gap between section of jurisdiction and section of jurisdiction of described negative ring, keep certain gap, negative ring pipe sheet assembling must ensure its assembled quality, the especially roundness of erecting ring in whole, and the sub-wedging of space timber wedge outside section of jurisdiction and between pedestal is fixed.
The present invention has following beneficial effect: its technique is simple, reasonable in design, ensure that shield structure works continuously normally, ensure that the quality that starts, ensure that Tunnel Construction Schedule, safety, improve economic benefit.
Accompanying drawing illustrates:
Fig. 1 is construction flow chart of the present invention.
Detailed description of the invention:
Below in conjunction with accompanying drawing, the present invention is described in detail.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with the drawings and the specific embodiments, the present invention is further elaborated.Should be appreciated that detailed description of the invention described herein only in order to explain the present invention, be not intended to limit the present invention.
Referring to Fig. 1, this detailed description of the invention is by the following technical solutions: its construction technology is as follows:
One, originating path is selected: reasonable computation reaction frame, angle between pedestal and portal, ensure that the distance of each point distance tunnel center line on shield machine disengaging pedestal anterior shield structure arbor line extended line is not more than 50mm, be placed on start on pedestal owing to entering hole anterior shield structure, control shield machine with shield structure base position during construction and enter hole attitude, shield machine seat center line and tunnel center line the North spacing 58mm, south 410mm, support center line is outside tunnel center line, and base central line front end is apart from side wall 500mm;
Two, starting end head stratum consolidation: adopt triple-pipe high pressure jet grouting stake to reinforce, rotary churning pile jumps stake every applying work, stake footpath φ 800-600mm, and occlusion 200mm, pore-forming is 18.7m, and its hollow hole is 6.7m.Adopt core-drill(ing) machine to get core in hole scope internal drilling after reinforcing, measure its intensity and transmission coefficient to ensure its consolidation effect;
Three, starting end head portal cuts: adopt pneumatic pick artificial chisel to remove, cutting principle is reasonable piecemeal, cut fast, guarantee safety, after portal is all abolished, shield machine rapid top hole driving face, carries out pressurization driving immediately after shield structure injection work plane, the external diameter that portal is abolished is decided to be φ 6700mm, and left and right line respectively need cut 5.5;
Four, the portal that starts sealing is installed: adopt conventional rubber curtain plate sealing means, portal slip casting adopts shield synchronization slip casting device pouring-in, not independent built-in slip casting pipe, should in advance rubber cord bolt be hung on the pre-buried steel loop in hole before driving, and be fixed with keeper plate of steel, rubber cord and fan steel plate head into and inside curved rubber cord by the housing of shield machine;
Five, the pedestal that starts is installed: adopt steel work, its center line is positioned at the outside of Tunnel Design center line, and be namely on the extended line in shield launching path, its gradient is consistent with the Tunnel Design gradient
[8], but raised 25mm than design altitude, pedestal welds with the built-in fitting at the bottom of starting well tunnel securely, and establishes bracing members in side, to guarantee its not slippage when shield launching;
Six, negative ring pipe sheet assembling: adopt closed loop section of jurisdiction, and carry out assembled according to the normal installed position in shield shell.Before the negative endless tube sheet of installation, for ensureing that negative endless tube sheet does not destroy the sealing brush of shield machine afterbody, ensure that negative endless tube sheet well can advance assembled later smoothly backward, fill plug seal grease in tail sealing brush, be not worn to protect tail sealing brush, first ring is born after endless tube sheet is assembled into, and moves after completing section of jurisdiction with 4 ~ 5 groups of jack;
Seven, reaction frame is installed: employing be the combined steel framed structure with sufficient intensity and rigidity, by maximum counter-force 3200t design during shield launching, and consider inhomogeneities and the least favorable factor of this counter-force;
Eight, shield structure curve starts gesture stability: during shield launching, its hinge angle is zero, shield structure central axis is positioned at the outside of Tunnel Design center line, namely be on the extended line in shield launching path, its gradient is consistent with the Tunnel Design gradient, but has raised 25mm than design altitude; Attitude shield structure before shield structure leaves pedestal is basic along predetermined originating path straight ahead before leaving the pedestal that starts, if desired by coming the selection of propelling jack to do trace adjustment to shield attitude, shield structure must cut portal reinforcing body during this period, with at a slow speed, low pressure for advancing principle, to guarantee the stable of shield attitude.Be 0.08MPa in shield machine working shaft shield launching place soil pressure as calculated, reinforce when section advances and increase to about 0.08MPa gradually by 0, and according to ground monitoring feedack, soil pressure setting value is adjusted in time.Control fltting speed according to cutter head torque, cutter head torque controls below 70%; Shield tail leaves pedestal backing structure and has been in state relatively freely, generally adjusts shield attitude by the reasonable selection of shield driving jack and hinge function adjusts, and progressively advances along Tunnel Design axis to make shield structure.
The start base central axis of gesture stability of described shield structure curve is consistent with the central axis tangent line in tunnel, the parallel propelling of shield machine; During processing reaction frame, carefully must adjust the supporting capacity of reaction frame; The axis of shield tunnel must be released accurately when reaction frame is installed.
The assembled change will noting gap between section of jurisdiction and section of jurisdiction of described negative ring, keep certain gap, negative ring pipe sheet assembling must ensure its assembled quality, the especially roundness of erecting ring in whole, and the sub-wedging of space timber wedge outside section of jurisdiction and between pedestal is fixed.
This detailed description of the invention has following beneficial effect: its technique is simple, reasonable in design, ensure that shield structure works continuously normally, ensure that the quality that starts, ensure that Tunnel Construction Schedule, safety, improve economic benefit.
The above is only in order to illustrate technical scheme of the present invention and unrestricted, other amendment that those of ordinary skill in the art make technical scheme of the present invention or equivalently to replace, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (3)
1. gravel clay layer small-radius shield curve starts construction technology, it is characterized in that its construction technology is as follows:
(1), originating path is selected: reasonable computation reaction frame, angle between pedestal and portal, ensure that the distance of each point distance tunnel center line on shield machine disengaging pedestal anterior shield structure arbor line extended line is not more than 50mm, be placed on start on pedestal owing to entering hole anterior shield structure, control shield machine with shield structure base position during construction and enter hole attitude, shield machine seat center line and tunnel center line the North spacing 50-60mm, south 400-420mm, support center line is outside tunnel center line, and base central line front end is apart from side wall 480-510mm;
(2), starting end head stratum consolidation: adopt triple-pipe high pressure jet grouting stake to reinforce, rotary churning pile jumps stake every applying work, stake footpath φ 800-600mm, occlusion 200mm, pore-forming is 18.5-18.9m, its hollow hole is 6.5-6.8m, adopts core-drill(ing) machine to get core in hole scope internal drilling, measure its intensity and transmission coefficient to ensure its consolidation effect after reinforcing;
(3), starting end head portal cuts: adopt pneumatic pick artificial chisel to remove, cutting principle is reasonable piecemeal, cut fast, guarantee safety, after portal is all abolished, shield machine rapid top hole driving face, carries out pressurization driving immediately after shield structure injection work plane, the external diameter that portal is abolished is decided to be φ 6500-6800mm, and left and right line respectively need cut 5.5;
(4) portal that, starts sealing is installed: adopt conventional rubber curtain plate sealing means, portal slip casting adopts shield synchronization slip casting device pouring-in, not independent built-in slip casting pipe, should in advance rubber cord bolt be hung on the pre-buried steel loop in hole before driving, and be fixed with keeper plate of steel, rubber cord and fan steel plate head into and inside curved rubber cord by the housing of shield machine;
(5), the pedestal that starts is installed: adopt steel work, its center line is positioned at the outside of Tunnel Design center line, and be namely on the extended line in shield launching path, its gradient is consistent with the Tunnel Design gradient
[8], but raised 25mm than design altitude, pedestal welds with the built-in fitting at the bottom of starting well tunnel securely, and establishes bracing members in side, to guarantee its not slippage when shield launching;
(6), negative ring pipe sheet assembling: adopt closed loop section of jurisdiction, and carry out assembled according to the normal installed position in shield shell.Before the negative endless tube sheet of installation, for ensureing that negative endless tube sheet does not destroy the sealing brush of shield machine afterbody, ensure that negative endless tube sheet well can advance assembled later smoothly backward, fill plug seal grease in tail sealing brush, be not worn to protect tail sealing brush, first ring is born after endless tube sheet is assembled into, and moves after completing section of jurisdiction with 4 ~ 5 groups of jack;
(7), reaction frame installs: employing be the combined steel framed structure with sufficient intensity and rigidity, by maximum counter-force 3200t design during shield launching, and consider inhomogeneities and the least favorable factor of this counter-force;
(8), shield structure curve starts gesture stability: during shield launching, its hinge angle is zero, shield structure central axis is positioned at the outside of Tunnel Design center line, namely be on the extended line in shield launching path, its gradient is consistent with the Tunnel Design gradient, but has raised 25mm than design altitude; Attitude shield structure before shield structure leaves pedestal is basic along predetermined originating path straight ahead before leaving the pedestal that starts, if desired by coming the selection of propelling jack to do trace adjustment to shield attitude, shield structure must cut portal reinforcing body during this period, with at a slow speed, low pressure for advance principle, to guarantee the stable of shield attitude, be 0.08MPa in shield machine working shaft shield launching place soil pressure as calculated, reinforce when section advances and increase to about 0.08MPa gradually by 0, and according to ground monitoring feedack, soil pressure setting value is adjusted in time.Control fltting speed according to cutter head torque, cutter head torque controls below 70%; Shield tail leaves pedestal backing structure and has been in state relatively freely, generally adjusts shield attitude by the reasonable selection of shield driving jack and hinge function adjusts, and progressively advances along Tunnel Design axis to make shield structure.
2. gravel clay layer small-radius shield curve according to claim 1 starts construction technology, it is characterized in that the start base central axis of gesture stability of described shield structure curve is consistent with the central axis tangent line in tunnel, the parallel propelling of shield machine; During processing reaction frame, carefully must adjust the supporting capacity of reaction frame; The axis of shield tunnel must be released accurately when reaction frame is installed.
3. gravel clay layer small-radius shield curve according to claim 1 starts construction technology, it is characterized in that the assembled change will noting gap between section of jurisdiction and section of jurisdiction of described negative ring, keep certain gap, negative ring pipe sheet assembling must ensure its assembled quality, especially the roundness of erecting ring in whole, the sub-wedging of space timber wedge outside section of jurisdiction and between pedestal is fixed.
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| CN201510316360.7A CN104912560B (en) | 2015-06-11 | 2015-06-11 | Gravel clay layer small-radius shield curve originates construction technology |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106703819A (en) * | 2017-01-05 | 2017-05-24 | 中铁十六局集团北京轨道交通工程建设有限公司 | Small-radius shield curve launching construction method for super-shallow-buried large-section tunnel |
| CN107725059A (en) * | 2017-09-27 | 2018-02-23 | 中铁十二局集团有限公司 | The ultrashort miniature shield machine main frame separate launching construction method originated under steric requirements |
| CN107747488A (en) * | 2017-10-13 | 2018-03-02 | 中铁四局集团第四工程有限公司 | The construction method of big cross section shape of a hoof shield launching |
| CN108049880A (en) * | 2018-01-30 | 2018-05-18 | 中铁二十二局集团第工程有限公司 | The shield machine originated in shield method tunnel construction using small curve radius |
| CN108222953A (en) * | 2018-01-09 | 2018-06-29 | 中铁四局集团第四工程有限公司 | The construction method that U-shaped opening shield machine passes through piping lane non-standard segment |
| CN108678756A (en) * | 2018-04-27 | 2018-10-19 | 青岛新华友建工集团股份有限公司 | It closes on rivers highly permeable stratum major diameter slurry shield and originates construction safely |
| CN108952733A (en) * | 2017-05-17 | 2018-12-07 | 沈阳市政集团有限公司 | Separate launching shield technique application construction method in municipal sewerage engineering |
| CN110159284A (en) * | 2019-05-22 | 2019-08-23 | 中铁十一局集团第四工程有限公司 | Strand hydraulic reclamation stratum shield machine is ultra-shallow earth-covered, big longitudinal slope originates construction method |
| CN110714773A (en) * | 2019-10-22 | 2020-01-21 | 中铁隧道集团二处有限公司 | Construction method for starting tunnel by shield method on large-gradient small curve of water-rich sand layer |
| CN110924960A (en) * | 2019-11-25 | 2020-03-27 | 中铁十六局集团北京轨道交通工程建设有限公司 | Subway construction method for shield starting before constructing station structure |
| CN111058860A (en) * | 2019-12-10 | 2020-04-24 | 中铁十四局集团隧道工程有限公司 | Cave opening construction method |
| CN113006808A (en) * | 2021-04-23 | 2021-06-22 | 中铁六局集团有限公司交通工程分公司 | Construction method for viscous geological shield initial section to penetrate shallow soil-covered river channel downwards |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106703819A (en) * | 2017-01-05 | 2017-05-24 | 中铁十六局集团北京轨道交通工程建设有限公司 | Small-radius shield curve launching construction method for super-shallow-buried large-section tunnel |
| CN108952733A (en) * | 2017-05-17 | 2018-12-07 | 沈阳市政集团有限公司 | Separate launching shield technique application construction method in municipal sewerage engineering |
| CN107725059A (en) * | 2017-09-27 | 2018-02-23 | 中铁十二局集团有限公司 | The ultrashort miniature shield machine main frame separate launching construction method originated under steric requirements |
| CN107747488A (en) * | 2017-10-13 | 2018-03-02 | 中铁四局集团第四工程有限公司 | The construction method of big cross section shape of a hoof shield launching |
| CN107747488B (en) * | 2017-10-13 | 2019-06-18 | 中铁四局集团第四工程有限公司 | The construction method of big cross section shape of a hoof shield launching |
| CN108222953A (en) * | 2018-01-09 | 2018-06-29 | 中铁四局集团第四工程有限公司 | The construction method that U-shaped opening shield machine passes through piping lane non-standard segment |
| CN108049880A (en) * | 2018-01-30 | 2018-05-18 | 中铁二十二局集团第工程有限公司 | The shield machine originated in shield method tunnel construction using small curve radius |
| CN108678756A (en) * | 2018-04-27 | 2018-10-19 | 青岛新华友建工集团股份有限公司 | It closes on rivers highly permeable stratum major diameter slurry shield and originates construction safely |
| CN110159284A (en) * | 2019-05-22 | 2019-08-23 | 中铁十一局集团第四工程有限公司 | Strand hydraulic reclamation stratum shield machine is ultra-shallow earth-covered, big longitudinal slope originates construction method |
| CN110714773A (en) * | 2019-10-22 | 2020-01-21 | 中铁隧道集团二处有限公司 | Construction method for starting tunnel by shield method on large-gradient small curve of water-rich sand layer |
| CN110924960A (en) * | 2019-11-25 | 2020-03-27 | 中铁十六局集团北京轨道交通工程建设有限公司 | Subway construction method for shield starting before constructing station structure |
| CN111058860A (en) * | 2019-12-10 | 2020-04-24 | 中铁十四局集团隧道工程有限公司 | Cave opening construction method |
| CN113006808A (en) * | 2021-04-23 | 2021-06-22 | 中铁六局集团有限公司交通工程分公司 | Construction method for viscous geological shield initial section to penetrate shallow soil-covered river channel downwards |
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