CN102587930B - Shield declination originating technology - Google Patents
Shield declination originating technology Download PDFInfo
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- CN102587930B CN102587930B CN201210042654.1A CN201210042654A CN102587930B CN 102587930 B CN102587930 B CN 102587930B CN 201210042654 A CN201210042654 A CN 201210042654A CN 102587930 B CN102587930 B CN 102587930B
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Abstract
The invention relates to the field of shield originating, in particular to a shield declination originating technology, and solves the problem that the existing shield can not perform straight-line or curve originating under special conditions. The technology comprises the following steps of: originating while keeping a certain angle theta between the shield axis and the design center line, and setting an initial offset a, wherein a<=50mm; after the shield host completely enters the soil body, correcting the deviation and adjusting the posture of the shield axis; and with the determined initial offset a, correcting the deviation so that the actual offset b is less than or equal to 50mm, wherein if the design line is a straight line, the shield axis returns to the design center line; and if the design line is a curve, the shield axis is consistent with the tangential direction of the design line and is close to the design center line. The technology provided by the invention not only can realize safe and smooth originating of the shield under special conditions, but also prevents overrun of the tunnel deviation; moreover, the technology is safe and practical and reasonable in design, and can realize safe originating of the shield under abnormal conditions and change the curve originating of the shield into straight-line originating under difficult conditions; and the technology is easy to correct deviation and guarantee line precision, and is safe and reliable in quality.
Description
Technical field
The present invention relates to shield launching field, be specially a kind of shield structure at the shield structure drift angle Originating Technique that cannot meet under normal Initial condition.
Background technology
Along with the fast development of city underground, Suporting structure obtains using more and more widely in the construction of city underground running tunnel, and adopting on sound lines starts is one of key link of shield construction.
Shield launching is divided into that straight line starts and the curve two kinds of basic skills that start.Curve starts and requires that to open shield tail hinged, thrust control is required strict, is difficult for accurately location, generally avoids using as far as possible.Straight line starts and relatively easily controls, and adopts straight line to start in construction as far as possible.
But not all shield structure normally straight line starts, and runs into special circumstances, as station headroom and shield structure main frame or rear package size does not mate, the section of starting designed lines is curve etc., shield structure often needs curve to start.But restricted by state-of-the art, the curve effect that starts is bad, easily cause reaction frame stressed unbalance, driving off-course deviation transfinites, the problem such as pipe sheet assembling faulting of slab ends transfinites, section of jurisdiction percolating water, serious also can cause reaction frame distortion, local line calcellation etc., to engineering itself, cause huge safe mass hidden danger.
Summary of the invention
The present invention cannot carry out the problem that straight line starts or curve starts in order to solve existing shield structure when running into special circumstances, and a kind of shield structure drift angle Originating Technique is provided.
The present invention adopts following technical scheme to realize: a kind of shield structure drift angle Originating Technique, during shield launching, keep certain angle theta to start in shield structure axis and design center line, initial offset a is set, and a≤50mm, until shield structure main frame, enter completely after the soil body, shield structure axis attitude is adjusted in correction again, determining under the prerequisite of initial offset a, by correction, makes real offset b≤50mm, when designed lines is straight line, make shield structure axis get back to design center line; When designed lines is curve, make shield structure axis consistent with designed lines tangential direction and near design center line.
Described correction speed≤3mm/m controls by 2mm/m when rectifying a deviation continuously.
Compared with prior art, the present invention can either realize shield structure and start smoothly safely under special circumstances, the object that keeps again tunnel deviation not transfinite, safe and practical, reasonable in design, the shield structure that can not only meet under non-normal condition starts safely, the shield structure curve under hard situation can also be started to become straight line and start, and is easy to correction and guarantees circuit precision, safe mass is reliable, can be widely used in various types of shield structures.
Accompanying drawing explanation
Fig. 1 is that designed lines is the drift angle of the straight line schematic diagram that starts;
Fig. 2 is that designed lines is the drift angle of the curve schematic diagram that starts;
Fig. 3 is related to schematic diagram for the bracket that starts, reaction frame and shield structure;
In figure: 1-starting well; Supporting after 2-; 3-shield structure axis; 4-designs center line; 5-shield structure; 6-reaction frame; The 7-bracket that starts.
The specific embodiment
A kind of shield structure drift angle Originating Technique, when shield structure 5 starts, keep certain angle theta to start in shield structure axis 3 and design center line 4, initial offset a is set, and a≤50mm, until shield structure main frame, enter completely after the soil body, shield structure axis attitude is adjusted in correction again, determining under the prerequisite of initial offset a, by correction, makes real offset b≤50mm, when designed lines is straight line, make shield structure axis get back to design center line; When designed lines is curve, make shield structure axis consistent with designed lines tangential direction and near design center line.
Starting in shield structure drift angle, is divided into two kinds of situations, Figure 1 shows that designed lines is the signal of starting of the drift angle of straight line, Figure 2 shows that designed lines is the signal of starting of the drift angle of curve, and in figure, L1 is straightway; L2 is changeover portion, and L3 is correction section, determines the value of initial offset a according to the size of bias angle theta, according to current national codes, a is necessary≤and 50mm.
In Specific construction, shield launching and correction process are as follows:
1 installs the bracket that starts
According to the shield machine shield body physical dimension being equipped with, the steel work that the designs and produces appropriate length bracket 7 that starts.Rear supporting 2, hang in after originating location, the locus of making shield launching attitude according to shield structure center and design the center line gradient and in-plane, then extrapolate the locus of the bracket that starts, utilize pad steel sheet to regulate the absolute altitude of the bracket that starts, reach the exact position of starting and requiring.As Fig. 3.
2 install reaction frame
Because shield structure axis and design center line have drift angle, for the thrust that guarantees shield launching can be applied on reaction frame completely, and reaction frame 6 stress equalizations, reaction frame need be installed perpendicular to design center line.As Fig. 3.
3 shield launching attitude controls
Shield attitude specifically refers to the existing state position (referring to elevation, plane, axis, the longitudinal gradient at shield structure otch He Dunweiliang center) of shield structure, with the relativeness in design tunnel how, total requirement makes tunnel elevation, plane deviation minimum, by shield structure axial line control in desired position.
Axis allowable variation when the initial stage tunnels: 1. horizontal departure-10～+ 15mm; 2. vertical missing-15～+ 20mm; 3. the angle of pitch is less than 3mm/m; 4. level angle error is less than 1mm/m.
Wherein, horizontal departure is that both sides are different, be as far as possible to a value oppositely partially.
4 corrections are controlled
(1) side-play amount control
Starting, what adopt is the straight line form that starts, shield structure axis forms angle with design center line, the circuit of correction is that interim form changes, when arriving highest distance position backing structure, just can slowly draw close to design center line, the real offset being configured at this position shield is b, according to current national codes, b must be less than 50mm, and it is crucial that control side-play amount b does not transfinite.
(2) shield excavation attitude control
When shield tail departs from start after pedestal (being that main frame enters the soil body completely), just can unclamp hingedly, start to rectify a deviation on a small quantity, correction speed≤3mm/m, 2mm/m control press in general continuous correction, otherwise easily causes Segment cracking, breakage.
(3) pipe sheet assembling correction
By calculating, in the schematic diagram that starts, side-play amount b value, as excessive, can be turned b value down by increasing a value, reaches the object that meets design and code requirement.As excessive in a value, can in segment assembly process, adjust section of jurisdiction close to design center line, concrete measure is as follows:
1. known according to analog line, shield structure axis and design center line intersect at straightway or changeover portion;
2. according to the size of shield tail clearance of shield machine, during segment assembly, capable of regulating section of jurisdiction is offset to the midline, the half that adjustment amount is gap of the shield tail, and now the structure midline shift amount at portal place can reduce the half of gap of the shield tail;
3., in the straightway starting from portal, section of jurisdiction is all offset to the midline near designed lines in assembled process;
4. enter after correction section, section of jurisdiction is still offset to the midline near designed lines in assembled process.
(4) section of jurisdiction back-grouting correction
The half that the correction amount that can adjust in pipe sheet assembling process is gap of the shield tail, in order to make tunnel center line near design center line, can pass through the one-sided slip casting of hole for hoist of section of jurisdiction, and suitable increase grouting pressure, can make tunnel center line further near design center line.
(5) shield structure correction
When shield structure main frame all enters after the soil body, in line with the principle of few correction, diligent correction, carry out the correction of shield structure.Correction speed≤3mm/m, general continuous correction is pressed 2mm/m and is controlled, and in correction process, maximum offset is the intersection point with changeover portion in correction section, meet the requirement of standard ± 50mm.
(6) theory of real offset b is calculated
Correction calculation of parameter table
| θ(mm/m) | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| a(mm) | / | / | 10 | 20 | 30 | 40 | 44 | 50 |
| b(mm) | 18 | 28 | 28 | 29 | 30 | 32 | 40 | 47 |
| L1(m) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| L2(m) | / | / | 9 | 9 | 9 | 9 | 9 | 9 |
| L3(m) | 9 | 14 | 14 | 15 | 15 | 16 | 20 | 24 |
Note: 1, in table, correction speed is pressed 2mm/m calculating;
2, general θ is no more than 10mm/m, as exceedes, and needs to increase correction speed;
3, because a presets, b is nonevent, should suitably strengthen a value and turn b value down;
4, L1 length of straigh line generally equals shield structure main frame length;
5, L2 transition section length calculated value is less, unfavorable for avoiding turning, can be by the control of shield structure main frame length;
6, L3 correction segment length is calculated according to the actual value of b and correction speed.
Claims (1)
1. a shield structure drift angle Originating Technique, while it is characterized in that shield structure (5) starts, keep certain angle theta to start in shield structure axis (3) and design center line (4), initial offset a is set, and a≤50mm, until shield structure main frame, enter completely after the soil body, shield structure axis attitude is adjusted in correction again, determining under the prerequisite of initial offset a, by correction, makes real offset b≤50mm, when designed lines is straight line, make shield structure axis get back to design center line; When designed lines is curve, make shield structure axis consistent with designed lines tangential direction and near design center line;
Shield launching and correction process are as follows:
1) bracket that starts is installed
According to the shield machine shield body physical dimension being equipped with, the steel work that the designs and produces appropriate length bracket that starts, rear supporting hanging in after originating location, the locus of making shield launching attitude according to shield structure center and design the center line gradient and in-plane, then extrapolate the locus of the bracket that starts, utilize pad steel sheet to regulate the absolute altitude of the bracket that starts, reach the exact position of starting and requiring;
2) reaction frame is installed
Reaction frame is installed perpendicular to design center line;
3) shield launching attitude control
Requirement makes tunnel elevation, plane deviation minimum, by shield structure axial line control in desired position;
4) correction is controlled
(1) side-play amount control
Starting, what adopt is the straight line form that starts, shield structure axis forms angle with design center line, the circuit of correction is that interim form changes, L1 is straightway, L2 is changeover portion, and L3 is correction section, when arriving highest distance position backing structure, just can slowly draw close to design center line, the real offset being configured at this position shield is b, and b is less than 50mm;
(2) shield excavation attitude control
When shield tail departs to start, just can unclamp after pedestal hingedly, start to rectify a deviation on a small quantity, correction speed≤3mm/m, 2mm/m control press in general continuous correction;
(3) pipe sheet assembling correction
By calculating, side-play amount b value, as excessive, is turned b value down by increasing a value, reaches the object that meets design and code requirement, as excessive in a value, adjusts section of jurisdiction close to design center line in segment assembly process, and concrete measure is as follows:
1. known according to analog line, shield structure axis and design center line intersect at straightway or changeover portion;
2. according to the size of shield tail clearance of shield machine, during segment assembly, adjust section of jurisdiction and be offset to the midline, the half that adjustment amount is gap of the shield tail, now the structure midline shift amount at portal place can reduce the half of gap of the shield tail;
3., in the straightway starting from portal, section of jurisdiction is all offset to the midline near designed lines in assembled process;
4. enter after correction section, section of jurisdiction is still offset to the midline near designed lines in assembled process;
(4) section of jurisdiction back-grouting correction
The half that the correction amount that can adjust in pipe sheet assembling process is gap of the shield tail, by the one-sided slip casting of hole for hoist of section of jurisdiction, and increases grouting pressure, makes tunnel center line further near design center line;
(5) shield structure correction
When shield structure main frame all enters after the soil body, correction speed≤3mm/m, general continuous correction is pressed 2mm/m and is controlled, and in correction process, maximum offset is the intersection point with changeover portion in correction section, meet the requirement of standard ± 50mm.
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| CN201210042654.1A CN102587930B (en) | 2012-02-24 | 2012-02-24 | Shield declination originating technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210042654.1A CN102587930B (en) | 2012-02-24 | 2012-02-24 | Shield declination originating technology |
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| CN102587930A CN102587930A (en) | 2012-07-18 |
| CN102587930B true CN102587930B (en) | 2014-04-23 |
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Families Citing this family (4)
| 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 |
| CN111734430B (en) * | 2020-07-07 | 2020-12-08 | 中国铁建重工集团股份有限公司 | Tunnel boring machine turning radius control method and control system |
| CN112012753B (en) * | 2020-09-17 | 2021-07-27 | 江苏西尔德建设工程有限公司 | Shield tunneling machine starting method based on special-shaped extension steel ring |
| CN113123800B (en) * | 2021-05-14 | 2022-04-15 | 中铁十四局集团大盾构工程有限公司 | Construction method of starting base of large-diameter shield tunnel steel structure |
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| CN101975068A (en) * | 2010-11-05 | 2011-02-16 | 上海隧道工程股份有限公司 | Construction method for tunnelling small-radius curve segment of tunnel through shield method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08333988A (en) * | 1995-06-07 | 1996-12-17 | Komatsu Ltd | Outbreak control device of copy cutter |
| JPH116386A (en) * | 1997-06-19 | 1999-01-12 | Komatsu Ltd | Manufacture of tunnel boring machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975068A (en) * | 2010-11-05 | 2011-02-16 | 上海隧道工程股份有限公司 | Construction method for tunnelling small-radius curve segment of tunnel through shield method |
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| 丁海明等.盾构施工小半径曲线始发点及始发方向探讨.《建筑技术》.2009, |
| 李勇军.武汉长江隧道盾构始发技术.《土工基础》.2008, * |
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