CN103953350A - Tunnel portal breaking method by using shield tunneling machine on quicksand strata - Google Patents

Tunnel portal breaking method by using shield tunneling machine on quicksand strata Download PDF

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Publication number
CN103953350A
CN103953350A CN201410212315.2A CN201410212315A CN103953350A CN 103953350 A CN103953350 A CN 103953350A CN 201410212315 A CN201410212315 A CN 201410212315A CN 103953350 A CN103953350 A CN 103953350A
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China
Prior art keywords
portal
abolished
strata
concrete
shield machine
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CN201410212315.2A
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Chinese (zh)
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CN103953350B (en
Inventor
马学仕
何振兴
高磊
曹伟
王辉
郭航
李仲锋
朱川鄂
邓能伟
鲍俊捷
方鲁兵
刘倩
张超
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中铁四局集团有限公司
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Priority to CN201410212315.2A priority Critical patent/CN103953350B/en
Publication of CN103953350A publication Critical patent/CN103953350A/en
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Publication of CN103953350B publication Critical patent/CN103953350B/en

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Abstract

The invention relates to a tunnel portal breaking method by using a shield tunneling machine on quicksand strata. An end wall building envelope is an underground continuous wall, and the portal breaking is double breaking and comprises two steps that when a tool nose of the shield tunneling machine is arranged at a distance of 500mm from the continuous wall, the first breaking of outer protective layer starts, and reinforcing steel bars are cut layer by layer after completion; for the second breaking, concrete at the center of the portal is broken into a circular opening by an air pick, the shield tunneling machine starts to propel, a cutterhead is pushed onto the continuous wall, and the tool nose is exposed, so that the residual wall body concrete is broken from top to bottom until the second row of reinforcing steel bars are exposed to be cut out; the last protective layer concrete of the continuous wall body is directly burst by the shield tunneling machine, and the receiving task is completed until all shield tunneling machines are put away. The tunnel portal breaking method solves the risk problem of the portal breaking on the quicksand strata, and has the characteristic that the shield tunneling machine quickly and safely reaches to a shield turning receiving well, and the water and sand gushing phenomena in the portal breaking process are better controlled.

Description

A kind of quicksand formation shield machine portal is abolished method
Technical field
The present invention relates to a kind of quicksand formation shield machine portal and abolish method.
Background technology
In numerous shield-tunneling construction fields, before shield machine arrives, after digging out the space enclosing structure of shield structure received well, the arrival of just appearing of shield structure, good at end well consolidation effect, in the good situation of geological conditions, can carry out according to a conventional method portal and cut.In shield launching, receiving area, very easily occur complicated geological condition, as water-rich sand layer, the underground artesian water water yield is larger etc., for this complicated geological, adopt conventional method may cause water burst, gush sand, and occur the accidents such as large-area ground caves in, cause great social influence.
Summary of the invention
Its object of the present invention is just to provide a kind of quicksand formation shield machine portal to abolish method, solved at drift sand stratum portal and abolished the problem that has risk, have the advantages that shield machine arrives shield structure received well quickly and safely, and controlled preferably portal and abolished and in process, occur water burst, the phenomenon of gushing sand.
The technical scheme that realizes above-mentioned purpose and take is, end well space enclosing structure is diaphragm wall, establishes inside and outside two-layer reinforcing bar, and it is to abolish for twice that portal is abolished, and comprises step,
1) when shield machine point width is during from diaphragm wall 500mm, start to abolish for the first time outer protective layer, abolish thickness is 50mm at every turn, after completing, reinforcing bar is cut off in layering, all cuts off to reinforcing bar;
2) abolish for the second time, first with pneumatic pick, portal center concrete is abolished to circular port, diameter is 1500mm, thickness is 750mm, and shield machine starts to advance, and cutterhead pushes up on diaphragm wall, point of a knife exposes, order is from top to bottom abolished residue body of wall concrete, until expose second row reinforcing bar, and now, cut off immediately reinforcing bar, cut off order for cutting off one by one from the bottom to top, the headroom size that after completing, timely inspection portal is abolished, guarantees there is no reinforcing bar, within concrete intrusion scope of design;
3) the last 50mm topping of diaphragm wall body of wall concrete, by the direct bursting of shield machine, treats that shield machine is all added, completes this reception task.
Compared with prior art the present invention has the following advantages.
Reduced at drift sand stratum portal and abolished existing risk, guarantee that shield machine arrives shield structure received well quickly and safely, for controlling preferably portal, abolish and in process, occur water burst, gush the drifting sand layer portal breaking construction method that sand phenomenon provides effective assurance shield machine to receive safely.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is that shield machine of the present invention advances operation schematic diagram;
Fig. 2 is A-A sectional view in Fig. 1;
Fig. 3 is that shield machine shield cutter of the present invention pushes up operation schematic diagram after diaphragm wall;
Fig. 4 is B-B sectional view in Fig. 3.
The specific embodiment
Quicksand formation shield machine portal is abolished method, and end well space enclosing structure is diaphragm wall 101, establishes inside and outside two-layer reinforcing bar, and as shown in Figure 1,2,3, 4, it is to abolish for twice that portal is abolished, and comprises step,
2) when shield machine point of a knife 104 is during apart from diaphragm wall 500mm, start to abolish for the first time outer protective layer, abolish thickness is 50mm at every turn, after completing, reinforcing bar is cut off in layering, all cuts off to reinforcing bar;
2) abolish for the second time, first with pneumatic pick, portal center concrete is abolished to circular port, diameter is 1500mm, thickness is 750mm, and shield machine 102 starts to advance, and cutterhead 103 tops are to diaphragm wall 101, point of a knife 104 exposes, order is from top to bottom abolished residue body of wall concrete, until expose second row reinforcing bar, and now, cut off immediately reinforcing bar, cut off order for cutting off one by one from the bottom to top, the headroom size that after completing, timely inspection portal is abolished, guarantees there is no reinforcing bar, within concrete intrusion scope of design;
3) the last 50mm topping of diaphragm wall 101 body of wall concrete, by the direct bursting of shield machine, treats that shield machine is all added, completes this reception task.
The described outer protective layer of abolishing for the first time adopts pneumatic pick to divide 3 layers of order from the bottom to top; by in lower floor 1, in a lower floor left side 2, the lower floor right side 3, middle level 4, in a left side, middle level 5, the right side, middle level 6, upper strata 7, the numeral number on a left side, upper strata 8, the right side, upper strata 9 abolishes, abolish thickness is 50mm at every turn.
Describedly abolish for the second time, order is from top to bottom abolished residue body of wall concrete, described order is from top to bottom divided 3 layers, by lower floor 16, in a lower floor left side 17, the lower floor right side 18, middle level 10, in a left side, middle level 14, the right side, middle level 15, upper strata 11, the order on a left side, upper strata 12, the right side, upper strata 13.
Embodiment
End well space enclosing structure adopts diaphragm wall form, and wall thickness 800mm establishes inside and outside two-layer reinforcing bar.
Portal is abolished to adopt and is abolished for artificial twice.
1. abolish for the first time outer protective layer, order is from the bottom to top abolished, and, first from starting to abolish the concrete on top layer at the bottom of hole, thickness is 50mm, and residue 750mm concrete can be abolished after outer placing of reinforcement cuts off;
2. diameter 1500mm circular port is dug out in portal center;
3. shield machine 102 starts to advance, and cutterhead 103 leans against on ground-connecting-wall, and point of a knife 104 exposes;
4. abolish residue body of wall, cut off reinforcing bar;
5. shield machine 102 jacking forward, until the whole added shield tails of shield machine are deviate from steel ring, completes this reception work.
As shown in Figure 1, 2, shield machine advances operation schematic diagram,
1. portal space enclosing structure adopts diaphragm wall pattern, wall thickness 800mm;
2. when shield machine point of a knife 104 is during apart from diaphragm wall 500mm, start to abolish portal outer protective layer concrete;
3. abolish the order that adopts pneumatic pick (to divide 3 layers) from the bottom to top, strictly by numeral number, abolish, abolish thickness is 50mm at every turn, and after completing, reinforcing bar is cut off in beginning layering, after reinforcing bar all cuts off, can carry out lower step operation.
As shown in Figure 3,4, shield machine shield cutter pushes up operation schematic diagram after diaphragm wall,
1. portal is abolished for the second time sequentially and is abolished in strict accordance with numeral number, first with pneumatic pick, portal center concrete is abolished to circular port, and diameter is 1500mm, and thickness is 750mm, and shield machine 102 starts to advance, and cutterhead 103 tops are to diaphragm wall 101, and point of a knife 104 exposes;
The order of 2. (dividing 3 layers) from top to bottom according to numeral number is abolished residue body of wall concrete, until expose second row reinforcing bar, now, cut off immediately reinforcing bar, cut off order for cutting off one by one from the bottom to top, the headroom size that after completing, timely inspection portal is abolished, guarantees there is no reinforcing bar, within concrete invades scope of design;
3. the last 50mm topping of body of wall concrete does not need to cut, and by the direct bursting of shield machine, treats that shield machine is all added, completes this reception task.

Claims (3)

1. quicksand formation shield machine portal is abolished a method, and end well space enclosing structure is diaphragm wall (101), establishes inside and outside two-layer reinforcing bar, it is characterized in that, it is to abolish for twice that portal is abolished, and comprises step,
1) when shield machine point of a knife (104) is during apart from diaphragm wall (101) 500mm, start to abolish for the first time outer protective layer, abolish thickness is 50mm at every turn, after completing, reinforcing bar is cut off in layering, all cuts off to reinforcing bar;
2) abolish for the second time, first with pneumatic pick, portal center concrete is abolished to circular port, diameter is 1500mm, thickness is 750mm, shield machine (102) starts to advance, cutterhead (103) top is to diaphragm wall (101), point of a knife (104) exposes, order is from top to bottom abolished residue body of wall concrete, until expose second row reinforcing bar, and now, cut off immediately reinforcing bar, cut off order for cutting off one by one from the bottom to top, the headroom size that after completing, timely inspection portal is abolished, guarantees there is no reinforcing bar, within concrete intrusion scope of design;
3) the last 50mm topping of diaphragm wall (101) body of wall concrete, by directly bursting of shield machine (102), treats that shield machine (102) is all added, completes this reception task.
2. a kind of quicksand formation shield machine portal according to claim 1 is abolished method; it is characterized in that; the described outer protective layer of abolishing for the first time adopts pneumatic pick to divide 3 layers of order from the bottom to top; numeral number by (7), upper strata left (8), upper strata right (9) in (4), middle level left (5), middle level right (6), upper strata in (1), lower floor left (2), lower floor right (3), middle level in lower floor is abolished, and abolish thickness is 50mm at every turn.
3. a kind of quicksand formation shield machine portal according to claim 1 is abolished method, it is characterized in that, describedly abolish for the second time, order is from top to bottom abolished residue body of wall concrete, described order is from top to bottom divided 3 layers, by the order of (11), upper strata left (12), upper strata right (13) in (10), middle level left (14), middle level right (15), upper strata in (16), lower floor left (17), lower floor right (18), middle level in lower floor.
CN201410212315.2A 2014-05-20 2014-05-20 Tunnel portal breaking method by using shield tunneling machine on quicksand strata CN103953350B (en)

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CN103953350B CN103953350B (en) 2017-02-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108756908A (en) * 2018-04-03 2018-11-06 中铁十二局集团有限公司 A kind of Suporting structure for voluntarily abolishing portal and method of appearing
CN109267565A (en) * 2018-11-02 2019-01-25 西南科技大学 For shield launching and receive the closure door structure and its construction method in construction

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040089179A (en) * 2003-04-11 2004-10-21 주식회사 엔티에스이앤씨 The structure for underground tunnel formation
CN1995701A (en) * 2006-12-30 2007-07-11 广东省基础工程公司 Mechanical breaking construction method for use as shield tunneling machine reached tunnel portal
CN101660419A (en) * 2008-08-27 2010-03-03 上海市机械施工有限公司 Construction method for putting tunnel shield into hole in special stratum
CN102635362A (en) * 2011-11-02 2012-08-15 中铁隧道集团有限公司 Secondary reception constructing method for shield arrival
CN103527205A (en) * 2013-09-29 2014-01-22 深圳中海建筑有限公司 Shield underwater oblique crossing hole entering construction method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040089179A (en) * 2003-04-11 2004-10-21 주식회사 엔티에스이앤씨 The structure for underground tunnel formation
CN1995701A (en) * 2006-12-30 2007-07-11 广东省基础工程公司 Mechanical breaking construction method for use as shield tunneling machine reached tunnel portal
CN101660419A (en) * 2008-08-27 2010-03-03 上海市机械施工有限公司 Construction method for putting tunnel shield into hole in special stratum
CN102635362A (en) * 2011-11-02 2012-08-15 中铁隧道集团有限公司 Secondary reception constructing method for shield arrival
CN103527205A (en) * 2013-09-29 2014-01-22 深圳中海建筑有限公司 Shield underwater oblique crossing hole entering construction method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108756908A (en) * 2018-04-03 2018-11-06 中铁十二局集团有限公司 A kind of Suporting structure for voluntarily abolishing portal and method of appearing
CN108756908B (en) * 2018-04-03 2019-10-11 中铁十二局集团有限公司 A kind of Suporting structure for voluntarily abolishing portal and method of appearing
CN109267565A (en) * 2018-11-02 2019-01-25 西南科技大学 For shield launching and receive the closure door structure and its construction method in construction

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