CN106703817A - Construction method for reducing damaged segments and offset deformation by small-radius curved shield tunneling - Google Patents
Construction method for reducing damaged segments and offset deformation by small-radius curved shield tunneling Download PDFInfo
- Publication number
- CN106703817A CN106703817A CN201510783608.0A CN201510783608A CN106703817A CN 106703817 A CN106703817 A CN 106703817A CN 201510783608 A CN201510783608 A CN 201510783608A CN 106703817 A CN106703817 A CN 106703817A
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- China
- Prior art keywords
- shield
- segments
- section
- tunneling
- jurisdiction
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0621—Shield advancing devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
Abstract
A construction method for reducing damaged segments and offset deformation by small-radius curved shield tunneling comprises the following steps: stopping a machine twice in a tunneling process of each circle of shield segments; stopping tunneling after tunneling by a distance of 40 cm every time; changing the current mode into a segment mounting mode; rapidly withdrawing all propulsion cylinders as long as a boot tree is separated from the segments; then placing all the boot trees of the cylinders on the segments; continuing tunneling; and eliminating a lateral force. Stress of the shield segments is analyzed by a boot tree withdrawing and releasing method, boot tree withdrawing and releasing construction is carried out at a reasonable time, cross component forces of thrust are reduced, negative effects of the thrust of the jack are reduced, integrity and offset deformation of the segments in a construction process are controlled, shield deviation rectifying efficiency is improved, and meanwhile, the quality of a formed tunnel is ensured.
Description
Technical field
The present invention relates to the construction method that a kind of use sharp radius curve shield driving reduces segment damage and skew deformation.
Background technology
The development in city has driven the development of urban rail transit construction, in the selection of rail line, due to by plan and build, structures are restricted so that the linear of track traffic becomes increasingly complex.Though sharp radius curve and heavy grade tunnel linear do not belong to good, above will be more and more in application.Shield span limit radius propelling construction belongs to the heavy difficulties in city rail construction, which kind of method to reduce segment damage using and skew deformation is particularly important.At present, the domestic method that adjustment jack thrust generally is combined using selection turning ring to minor radius propulsion, the method is primarily adapted for use in the larger shield interval line style of radius, but the side component produced during shield is turned can neither be eliminated, again without the damaged degree with skew deformation of standard measure shield duct piece, therefore often because constructing operation is improper, and it is excessive to cause shield line style to offset, rectified a deviation ruthless, circuit deformation is excessive, segment damage is serious, and progradation is to surrounding environment influence degree, cannot qualitatively judge, so as to Tunnel Water Leakage will be caused, the security of influence operation vehicle.
Because traditional in for limit small-radius shield construction method, effect is undesirable, efficiency is low, the skew of shield line style is excessive, segment damage is serious, progradation is to surrounding environment influence degree, it is impossible to qualitatively judge.
The content of the invention
The purpose of the present invention is that and overcomes above-mentioned the deficiencies in the prior art, and the construction method that a kind of use sharp radius curve shield driving reduces segment damage and skew deformation is provided, the method can be effectively prevented from shield line style and offset the serious phenomenon of excessive, segment damage, and can qualitatively judge the influence degree to surrounding environment in progradation.
As above conceive, the technical scheme is that：A kind of use sharp radius curve shield driving reduces the construction method of segment damage and skew deformation, it is characterised in that：In every ring shield duct piece tunneling process, shut down 2 times, often tunnel 40cm and stop propulsion; replace to section of jurisdiction Installation Modes, quickly withdraw all propelling cylinders, as long as stretcher for boot and shoe departs from section of jurisdiction; then all oil cylinder stretcher for boot and shoe are all withstood on section of jurisdiction again, continues to tunnel, eliminate side force.
The present invention uses folding and unfolding stretcher for boot and shoe method, force analysis is carried out to shield duct piece, selecting rational opportunity carries out folding and unfolding stretcher for boot and shoe construction, reduce the cross component force of thrust, the negative interaction of jack thrust is reduced, the integrity degree and skew deformation to section of jurisdiction in work progress are controlled, and not only increase the efficiency of shield correction, the quality in shaping tunnel is ensure that simultaneously
Technical security reliability.
Brief description of the drawings
Fig. 1 is that shield machine thrust decomposing schematic representation is received in turning section of jurisdiction；
Fig. 2 is the ring horizontal displacement change schematic diagram of shield driving one.
Specific embodiment：
1st, sharp radius curve section segment damage analysis
When shield is tunneled in straight line, easement curve and sweeping curve section, the stretcher for boot and shoe of propelling cylinder is generally not easy to squeeze broken section of jurisdiction, but when shield machine is tunneled on the curved section that radius is R305m, the probability of the stretcher for boot and shoe destruction section of jurisdiction of propelling cylinder is significantly larger than other line segments.This is primarily due to that sharp radius curve section gap of the shield tail is too small to be caused shield tail and section of jurisdiction to get stuck with section of jurisdiction larger displacement to occur under the horizontal component effect of thrust, causes between jack and section of jurisdiction, contact so as to cause breakage after the stress of section of jurisdiction into line or face between section of jurisdiction and section of jurisdiction.Analyze in detail below.
1.1 sections of jurisdiction occur larger displacement under horizontal component effect causes breakage so as to cause section of jurisdiction to invade limit.
Shield is in itself a huge rigid body, and R305m is almost its least limit radius of turn.Shield can cause propelling cylinder unbalance stress when being tunneled close on design limit radius of turn curved section, and great disparity is very big.When turning in the horizontal direction, the outside cylinder force of turning is maximum, and inner side cylinder force is minimum.The oil pressure of outer side cylinder can reach pressure very high in driving, and the pressure of inboard portion oil cylinder is extremely low, and the thrust that stretcher for boot and shoe is contacted with section of jurisdiction is minimum, and at this moment, the driving thrust of shield is all concentrated on outer side cylinder, rather than circumference equiblibrium mass distribution.Therefore, the propulsive thrust that outside section of jurisdiction is locally born can also exceed the allowable load of section of jurisdiction.Simultaneously, shield often tunnels a ring in sharp radius curve tunnel, because axis produces angle at section of jurisdiction end face and this, a horizontal component is produced under the thrust of jack, this component can progressively be increased with the continuation of shield propulsion, after pipe ring is deviate from shield tail, influenceed by cross component force and to curve lateral offset, cause section of jurisdiction to rupture.Such as Fig. 1.
1.2 are caused section of jurisdiction crackle or are burst apart due to changing greatly for shield attitude.
When being tunneled in sharp radius curve section from for other side, the attitudes vibration of shield is larger, this just produces a trend for small lateral sliding amount or lateral sliding between propelling cylinder stretcher for boot and shoe and section of jurisdiction, causes section of jurisdiction local pressure excessive and cracks or burst apart.This lateral sliding trend is progressively increased with the propulsion of shield.As shown in Figure 2.As seen from the figure, when being tunneled on left-hand turning R305m curves, shield will always keep an angle (about 0.50 °) to the left to push ahead, and the displacement that propulsion 1 ring (1.2m) shield occurs to the left is line segment BC (10.5mm).Camber line AB can be regarded as the gross thrust that line segment AB, AB can be considered as propelling cylinder in figure, BC and AC is then its component, and BC is side force, and AC is the positive thrust of shield machine direction of propulsion.It is the 1/2 of bottom line principle according to right angled triangle center line, the line segment DE in figure should be the 1/2 of line segment BC.That is, propulsion of the shield machine on R305m curved sections, the cross component force of propelling cylinder is increased with the shield machine propulsion increase of length, and the stroke of the continuous propulsion of lateral thrust and shield is directly proportional, and it is when a length of the cycle end of a period is tunneled to produce maximum cross component force.Such as Fig. 2.
2nd, learnt based on the above-mentioned force analysis to shield duct piece, the reason for by analyzing segment damage：Shield is tunneled on minor radius 305m curved sections, and the stretcher for boot and shoe of propelling cylinder is as the stroke of propelling cylinder is directly proportional change to the cross component force that section of jurisdiction produces.According to this characteristic; take preventive measures; in every ring (1.2m) tunneling process, shut down 2 times, often tunnel 40cm and stop propulsion; replace to section of jurisdiction Installation Modes; all propelling cylinders are quickly withdrawn, as long as stretcher for boot and shoe departs from section of jurisdiction, all oil cylinder stretcher for boot and shoe is all withstood on section of jurisdiction again then; continue to tunnel, eliminate side force.So on the premise of equal thrust, the side force of generation only has when disposably advancing 1.2m 1/3 or so.The side force that so section of jurisdiction is subject to reduces, and section of jurisdiction is squeezed bad probability and substantially reduces, and even zero.In propulsion, accomplish that duty is entangled to shield attitude and entangle less, while strictly control segment selection can just avoid causing the generation of segment damage because gap of the shield tail is too small.
Claims (1)
1. a kind of use sharp radius curve shield driving reduces the construction method of segment damage and skew deformation, its
It is characterised by：In every ring shield duct piece tunneling process, shut down 2 times, often tunnel 40cm and stop propulsion, displacement
To section of jurisdiction Installation Modes, all propelling cylinders are quickly withdrawn, as long as stretcher for boot and shoe departs from section of jurisdiction, then again institute
There is oil cylinder stretcher for boot and shoe all to withstand on section of jurisdiction, continue to tunnel, eliminate side force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510783608.0A CN106703817A (en) | 2015-11-16 | 2015-11-16 | Construction method for reducing damaged segments and offset deformation by small-radius curved shield tunneling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510783608.0A CN106703817A (en) | 2015-11-16 | 2015-11-16 | Construction method for reducing damaged segments and offset deformation by small-radius curved shield tunneling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106703817A true CN106703817A (en) | 2017-05-24 |
Family
ID=58931896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510783608.0A Pending CN106703817A (en) | 2015-11-16 | 2015-11-16 | Construction method for reducing damaged segments and offset deformation by small-radius curved shield tunneling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106703817A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110298074A (en) * | 2019-05-22 | 2019-10-01 | 中交第四航务工程局有限公司 | Construction loads causes the calculation method of curve shield tunnel soil deformation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08121078A (en) * | 1994-10-19 | 1996-05-14 | Okumura Corp | Tunnel construction method and tunnel excavating machine |
| CN101289938A (en) * | 2008-06-12 | 2008-10-22 | 北京城建设计研究总院有限责任公司 | Subway shield tunnel enlarging station special area and station structure connecting method |
| CN103643965A (en) * | 2013-12-16 | 2014-03-19 | 上海市基础工程集团有限公司 | Repair and reinforcement construction methods for segments in formed tunnel |
| CN104653229A (en) * | 2015-01-27 | 2015-05-27 | 粤水电轨道交通建设有限公司 | Shielding sliding shoe curvilinear pushing-up hole-passing construction method |
-
2015
- 2015-11-16 CN CN201510783608.0A patent/CN106703817A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08121078A (en) * | 1994-10-19 | 1996-05-14 | Okumura Corp | Tunnel construction method and tunnel excavating machine |
| CN101289938A (en) * | 2008-06-12 | 2008-10-22 | 北京城建设计研究总院有限责任公司 | Subway shield tunnel enlarging station special area and station structure connecting method |
| CN103643965A (en) * | 2013-12-16 | 2014-03-19 | 上海市基础工程集团有限公司 | Repair and reinforcement construction methods for segments in formed tunnel |
| CN104653229A (en) * | 2015-01-27 | 2015-05-27 | 粤水电轨道交通建设有限公司 | Shielding sliding shoe curvilinear pushing-up hole-passing construction method |
Non-Patent Citations (2)
| Title |
|---|
| 李翔: "小半径曲线盾构掘进时管片破损分析", 《现代城市轨道交通》 * |
| 王宏: "小半径曲线并大坡度盾构施工管片破损及上浮受力分析", 《石家庄铁道大学学报( 自然科学版)》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110298074A (en) * | 2019-05-22 | 2019-10-01 | 中交第四航务工程局有限公司 | Construction loads causes the calculation method of curve shield tunnel soil deformation |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170524 |
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