CN100381647C - Construction process of bagged concrete foundation with limit device for immersed tube tunnel - Google Patents
Construction process of bagged concrete foundation with limit device for immersed tube tunnel Download PDFInfo
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- CN100381647C CN100381647C CNB200510023338XA CN200510023338A CN100381647C CN 100381647 C CN100381647 C CN 100381647C CN B200510023338X A CNB200510023338X A CN B200510023338XA CN 200510023338 A CN200510023338 A CN 200510023338A CN 100381647 C CN100381647 C CN 100381647C
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Abstract
The present invention relates to the die bag concrete foundation construction technology of a sinking pipe tunnel with a limiting device, which at least comprises the follow steps: limiting foundations of die bag concrete are used as sinking and placing foundations of a pipe section, a limiting device is welded on a steel plate at the top surface of the foundations which can be exactly positioned by a lifting platform on sea and a guiding frame. A layer of concrete for making a plane is poured before the die bag concrete is poured, and a die bag is poured by anti-separation concrete with strong liquidity to form the foundation of sinking and placing the pipe section. The guiding frame connected with the steel plate at the top surface of each foundation is removed after the die bag concrete is finished to be poured and achieves the design strength via curing. The steel plate at the top surface of each foundation ensures flat degree and standard height and satisfies the sinking and placing requirements of the pipe section, without the need of treatment for the second time. The soft die bags at the lateral surface and the bottom surface ensure that the concrete is tightly poured and is tightly attached with a rugged excavation surface after a foundation slot is blasted, and thus, sedimentation of the tunnel in later period is reduced. The present invention simplifies the construction technology of sedimentation foundation, and has good actual effect.
Description
Technical field
The present invention is relevant for a kind of construction technology that has the immersed tube tunnel sinking basis of stopping means, especially relevant for the immersed tube tunnel construction process of bagged concrete foundation that has stopping means in a kind of building engineering field.
Background technology
Immersed tube tunnel pipeline section sinking foundation working process is one of difficult problem of immersed tunnelling method tunnel, particularly rectangle immersed tunnelling method constructing tunnel.
The construction of immersed tube tunnel underwater pile foundation also will take measures to guarantee the closely connected power transmission in bottom of stake top and pipeline section except the plan-position that will consider stake, the job practices that adopts has usually: adjustable stake top method, pile cover method and mud jacking pouch method.What the Ku Hewen tunnel of Holland and Ze Baige tunnel and Rotterdam, NED subway tunnel adopted all is adjustable stake top method, this method is to establish the movable stake of a bit of precast concrete top on all foundation pile tops, after the pipeline section sinking is intact, cement injection mortar in the cavity between movable stake top and pile body, with activity stake jacking to manage closely connected contact the in the end till.Said method requires the diver to carry out cavity mortar depositing construction between activity stake top and the pile body, and this moment pipeline section sinking is in place, so adopt the foundation pile of this method can only be arranged in both sides.For big section, large-scale engineering, lay out pile as adopting both sides, not only need select large diameter steel pipe pile to improve bearing capacity of single pile, pipeline section cross section moment of flexure will significantly increase simultaneously, certainly will cause investment significantly to increase.The pile cover method has solved the major defect that only can lay out pile in the structure outside in the said method, the pile foundation in the tunnel, port, Tokyo of employing pile cover method has adopted a kind of movable pile cover of steel, between basic top and movable stake, pad with cushion course, cushion thickness is by estimating that sedimentation decides, after the pipeline section sinking finished, between pipeline section and the movable stake top, perfusion mortar was tamped.The thickness of this method bed course must be by estimating that sedimentation decide, and this sedimentation discreet value meeting produces bigger difference because of the variation of engineering geological conditions, construction technology etc., is difficult to determine a suitable numerical value.When perfusion mortar,, cause a large amount of losses of mortar easily simultaneously, increased construction investment, bring hidden danger also for the quality of engineering, push up the supporting role of failing the densification reality and having lost pile foundation such as stake because can't take the lateral confinement measure.The mud jacking pouch method that adopts in normal big vast tunnel, China Ningbo has overcome the deficiency of preceding two kinds of methods, this construction technology is, steel facing of steel pile extension end face welding at foundation pile, steel pile extension end face spacing with foundation pile at the bottom of the pipeline section of sinking back in place is 20cm, folding being positioned over of capsule bag managed at the end, the pre-buried position of capsule bag be in pipeline section bottom corresponding to the position of foundation pile, after pipeline section is in place directly by madjack pipe to the slip casting of mud jacking capsule bag, be connected with the closely connected of top panel to reach the pipe end.
In the said method in order to realize managing the end and the stake closely connected power transmission in top, construction is proceeded in two phases, at first before the pipeline section sinking, carry out piling construction, because the high difficult strict control of the top mark of piling construction stake under water will be handled stake jacking row usually, pipeline section sinking back in place is by regulating the stake top or carrying out mud jacking and realize the pipe end and the stake closely connected power transmission in top, construction technology is comparatively complicated, when mud jacking is constructed, be difficult to control grouting pressure exactly, make this pressure not only guarantee that the space was filled with closely knit but also pipeline section can not be lifted.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art and defective, a kind of construction technology that has the immersed tube tunnel bagged concrete foundation of stopping means is provided, with the basis of the spacing basis of mold-bagged concrete as the pipeline section sinking, plan-position and base roof plate elevation by marine elevating platform and the strict control of leading truck basis, guarantee that pipeline section bottom and basis are in the closely connected power transmission of vertical direction, need not to carry out after-treatment, reduce the posterior settlement in tunnel, and, help the stability of sinking pipeline section after finishing sinking by the horizontal locking after the stopping means realization pipeline section sinking default on the base roof plate.
The present invention is achieved by the following technical solutions, and concrete technology comprises the steps: at least
(a) determine to adopt the sinking basis of the spacing basis of mold-bagged concrete as pipeline section;
(b) determine to adopt marine elevating platform and leading truck that the basis is accurately located;
(c) determine to pour into a mould one deck blinding concrete earlier before the mold-bagged concrete cast;
(d) determine to adopt the little concrete filling mould bag of separation property in mobile height, the water, form the basis of sinking pipeline section; And,
(e) determine that the intensity recession that reaches design at mold-bagged concrete removes the leading truck that links to each other with basic top steel plate.
In step (a), tunnel sinking foundation trench dredge dig finish after, the spacing basis of construction mold bag concrete is as the sinking basis of pipeline section in foundation trench, pipeline section one end bearing is at the following nose holder end of sinking pipeline section, the other end is bearing on the spacing basis of mold-bagged concrete.The basis end face is a steel plate, and side and bottom surface are the mould bag, form the basis by charge concrete in the mould bag.
In step (b), marine elevating platform rises leg, after platform drops down onto the water surface, by band cable strand anchor platform is shifted, it is roughly approaching with the sinking base center that will construct that platform is displaced to the platform center, and the axis of platform and basic substantially parallel the getting final product of axis, the leg platform that falls then lifts away from the water surface.Leading truck is by the joint connection, and the end of leading truck and basic end face steel plate are rigidly connected, and the leading truck top is fixed on the platform holder.Realize the plan-position and the basic end face absolute altitude on basis are accurately located by the height of mobile platform driving and lifting leading truck.
In step (c), the bagged concrete foundation scope is carried out desilting, desilting is poured into a mould one deck blinding concrete to the excavation face.
In step (d), after finishing, the location, basis then rely on marine elevating platform in basic mould bag, to charge concrete by conduit, concrete will have good mobility, to guarantee that mould bag inner concrete charges closely knit, simultaneously concrete will have the antiscour characteristic, emanates to avoid in the process that charges concrete.
In step (e), concrete filling is finished and after maintenance reached design strength, water was removed the bolt that basic end face steel plate is connected with leading truck under the diver, and leading truck separates with the basis.
The steel plate of basis end face has guaranteed that the planeness of end face and absolute altitude satisfy the requirement of pipeline section sinking, and the soft mode bag of side and bottom surface guarantees again can be closely connected with rough excavation face after the foundation trench explosion when concrete filling is closely knit.
Description of drawings
Fig. 1 has the immersed tube tunnel bagged concrete foundation construction schematic diagram of stopping means for the present invention.
The specific embodiment
Feature of the present invention and other correlated characteristic are described in further detail by case history below in conjunction with accompanying drawing.
Fig. 1 is the spacing foundation construction schematic diagram of immersed tube tunnel mold-bagged concrete.As shown in Figure 1, label 1 to 12 is represented respectively: mixer ship (1), platform (2), walking driving (3), leading truck firm banking (4), spud leg (5), tremie (6), leading truck (7), down draught cable (8), basic end face steel plate (9), mold-bagged concrete (10), blinding concrete (11) and mould bag (12).
With the construction of certain rectangle immersed tube tunnel is example, and this pipeline section width is 8.1m, highly is 4.4m, and every joint length is 23.4m, and every tunnel is totally 6 pipe joint sections, the maximum water depth 26m of pipeline section sinking.
Immersed tube tunnel axis place is the rock bedding, can't carry out piling construction, and is infeasible as the sinking basis of pipeline section with pile foundation.Adopt the basis of the spacing basis of mold-bagged concrete as the pipeline section sinking in the engineering, pipeline section one end bearing of sinking is in the following nose holder of pipeline section in place, and the other end is by the spacing foundation support of mold-bagged concrete.
The top board (9) on basis is the steel plate of 16mm for thickness, and planar dimension is 8.5m * 1m, opens 3 holes on the steel plate, is respectively concrete casting orifice and each one the inspection eye of both sides that is positioned at the middle part.Add weldering shaped steel in the bottom surface of steel plate to increase the rigidity of steel plate.Be higher than basic end face in order to prevent that the mould bagging turns up in the concrete filling process, around steel plate, weld the long angle steel of 0.5m as the anti-turning-up devices of mould bag.Mould bag (12) is to make with the high-strength geotextiles of 350kg/m2 to form, and mould bag height will suit, and is preferably 0.8m～1.5m according to the situation differing heights of excavating foundation trench.Two face down bonding stopping means at steel plate.
The foundation trench explosion dredge dig finish after, carry out marine elevating platform (2) location according to the sleeper beam position of design, it is roughly approaching that the center of the center of platform and sleeper beam will be satisfied in the platform location, and the axis of platform is parallel with the axis on basis.Platform then falls to putting spud leg (5) behind the location, and platform lifts away from the sea.
The purpose of leading truck (7) is the steel plate that is used for fixing the sleeper beam end face, and determines the position of sleeper beam top board to control sinking basic plane position and elevation to reach by the position of measuring leading truck.Leading truck is with the seamless steel pipe of 108mm * 8mm and 2m * 2m * 30m composite frame structure that L100mm * the 10mm angle steel is welded, and whole leading truck divides 3 joints, adopts different length according to different each joint of the depth of water, is connected by bearing pin between each joint.After the position of leading truck is determined its top is fixed on the leading truck firm banking (4) on the platform, the bottom is with down draught cable (8) tension.
Levelling blinding concrete (11) is preceding clean with the silt displacement of foundation trench bottom pouring, guarantee that sleeper beam mold-bagged concrete (10) basis directly is seated on the basement rock, desilting work will deposit fixed mud by the diver with giant and break up, and check clear position and cleaning situation under water.
Mold-bagged concrete (10) cast is basic identical with the technology of common underwater concreting.Take off on the basis place far away by mixer ship (1) supply concrete to guarantee the continuity of casting process, the diver is follow-up investigations concrete filling situation under water.When concrete when the inspection eye of end face steel plate outwards overflows, should pull out conduit slowly and make concrete be full of whole mould bag.Exceed the sleeper beam top board as inspection eye place concrete, should the raised area concrete be wipeed off with scraper plate by the diver, and top board is cleaned out.
According to the requirement of strength on basis, the label of underwater concrete should be C20.Because trend has certain flow velocity under water, underwater concrete must have anti-stalling characteristic; In order to guarantee the packing density of concrete in the mould bag, underwater concrete has good mobility again.
Engineering practice is the result show, the required precision that the pipeline section sinking is docked is satisfied fully with the end face absolute altitude in the plan-position of sleeper beam, the stopping means locking rear stability of pipeline section on pillow fine strain of millet top board is good, and the later stage monitoring result of pipeline section shows that pipeline section does not have obvious sedimentation, has reached designing requirement.
Claims (5)
1. the spacing foundation working process of immersed tube tunnel mold-bagged concrete is characterized in that comprising the steps: at least
(a) determine to adopt the sinking basis of the spacing basis of mold-bagged concrete as pipeline section;
(b) determine to adopt marine elevating platform and leading truck that the basis is accurately located;
(c) determine cast one deck leveling concrete before the mold-bagged concrete cast;
(d) definite anti-separation concrete filling mould bag that adopts large fluidity, the basis of formation sinking pipeline section; And,
(e) determine that reaching the design strength recession at mold-bagged concrete through maintenance removes the leading truck that links to each other with basic top steel plate.
2. the spacing foundation working process of mold-bagged concrete according to claim 1 is characterized in that the side of described steel plate and bottom surface are the soft mode bag.
3. the spacing foundation working process of mold-bagged concrete according to claim 1, it is characterized in that welded limiting device on the steel plate of basic end face, locking device is reserved screw, with screw rod pipeline section is tightened from the side after pipeline section is in place, to prevent pipeline section generation lateral displacement.
4. the spacing foundation working process of mold-bagged concrete according to claim 1, it is characterized in that adopting marine elevating platform and leading truck the basis accurately to be located: (a) platform to be shifted by the band cable by the method that comprises the steps at least, platform is displaced to the platform center and the base center is roughly approaching, and the axis of platform and basic substantially parallel the getting final product of axis; (b) leading truck is positioned, the end of leading truck is rigidly connected with the top board on basis, thereby realizes the accurate location to the basis.
5. the spacing foundation working process of mold-bagged concrete according to claim 1, it is characterized in that by following technical measures, adopt the anti-separation concrete filling mould bag of large fluidity, form pipeline section sinking basis: rely on marine elevating platform in basic mould bag, to charge concrete by tremie, the diver carries out follow-up investigations under water, when concrete when the inspection eye of end face steel plate outwards overflows, should pull out conduit slowly and make concrete be full of whole mould bag, and the concrete that will overflow top board is removed clean.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510023338XA CN100381647C (en) | 2005-01-14 | 2005-01-14 | Construction process of bagged concrete foundation with limit device for immersed tube tunnel |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200510023338XA CN100381647C (en) | 2005-01-14 | 2005-01-14 | Construction process of bagged concrete foundation with limit device for immersed tube tunnel |
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| CN1804233A CN1804233A (en) | 2006-07-19 |
| CN100381647C true CN100381647C (en) | 2008-04-16 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102425170B (en) * | 2011-08-26 | 2013-11-06 | 中国葛洲坝集团股份有限公司 | Underwater sealing method for template bottom mouth |
| CN103485565A (en) * | 2013-08-05 | 2014-01-01 | 王振牛 | Innovative technical scheme for prefabricated/assembled sea-surface multipurpose base |
| CN106677242A (en) * | 2017-01-18 | 2017-05-17 | 王燏斌 | Engineering ship for underwater tunnel and construction method of engineering ship |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07233531A (en) * | 1993-12-28 | 1995-09-05 | Mitsui Constr Co Ltd | Slime cleaning device |
| JP2001262575A (en) * | 2000-03-23 | 2001-09-26 | Ohbayashi Corp | Method of placing underwater concrete using lightweight aggregate |
| CN1080355C (en) * | 1996-09-02 | 2002-03-06 | 阎瑞明 | Segmental prefabricating negative pressure sealing submarine tunnel prefabricated components and construction method thereof |
| CN1470711A (en) * | 2003-04-28 | 2004-01-28 | 上海市隧道工程轨道交通设计研究院 | Pipeline sinking tunnel pile foundation bag mud pressing method |
| CN1149320C (en) * | 1999-12-17 | 2004-05-12 | 江苏省海洋工程总公司第三分公司 | Underwater mould bag concrete construction process |
-
2005
- 2005-01-14 CN CNB200510023338XA patent/CN100381647C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07233531A (en) * | 1993-12-28 | 1995-09-05 | Mitsui Constr Co Ltd | Slime cleaning device |
| CN1080355C (en) * | 1996-09-02 | 2002-03-06 | 阎瑞明 | Segmental prefabricating negative pressure sealing submarine tunnel prefabricated components and construction method thereof |
| CN1149320C (en) * | 1999-12-17 | 2004-05-12 | 江苏省海洋工程总公司第三分公司 | Underwater mould bag concrete construction process |
| JP2001262575A (en) * | 2000-03-23 | 2001-09-26 | Ohbayashi Corp | Method of placing underwater concrete using lightweight aggregate |
| CN1470711A (en) * | 2003-04-28 | 2004-01-28 | 上海市隧道工程轨道交通设计研究院 | Pipeline sinking tunnel pile foundation bag mud pressing method |
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