CN106884427A - Immersed tube tunnel and immersed tube tunnel changeover portion soft soil foundation reinforcing method under water - Google Patents
Immersed tube tunnel and immersed tube tunnel changeover portion soft soil foundation reinforcing method under water Download PDFInfo
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- CN106884427A CN106884427A CN201710200234.4A CN201710200234A CN106884427A CN 106884427 A CN106884427 A CN 106884427A CN 201710200234 A CN201710200234 A CN 201710200234A CN 106884427 A CN106884427 A CN 106884427A
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- under water
- immersed tube
- tube tunnel
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- compaction pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/063—Tunnels submerged into, or built in, open water
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- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a kind of immersed tube tunnel under water, including the Soft Soil Layer under water reinforced with sand compaction pile, and the block stone bed course and blotter being laid on successively on the Soft Soil Layer under water；The immersed tube tunnel laid above blotter, immersed tube tunnel top and both sides are backfill block stone structures；Height of the laying level height of the immersed tube tunnel less than Soft Soil Layer under water；The transverse width of the transverse width more than immersed tube tunnel of the described Soft Soil Layer under water, block stone bed course and blotter reinforced with sand compaction pile.The present invention sets horizontal block stone bed course form compound foundation using sand compaction pile displacement, compacted weak soil, can effectively improve foundation bearing capacity, reduce residual settlement after work, reaches the purpose of reinforcing soft ground.The method has that foundation stabilization effect is good, economic and environment-friendly, depth is big for treatment, the manageable advantage of construction quality.
Description
Technical field
The present invention relates to foundation treatment technology, more particularly to one kind immersed tube tunnel changeover portion soft soil foundation and its reinforcing under water
Method, belongs to bridge tunnel engineering construction technical field.
Background technology
In recent years, Transportation Infrastructure Construction quickly grows, and large quantities of bridge spanning the seas and passage start to build, more and more
Tunnel in sea, bridge, man-made island engineering construction on complicated offshore soft foundation.Under water immersed tube tunnel itself load compared with
It is small, mainly based on anti-floating power, need not generally carry out basement process, but immersed tube tunnel changeover portion under water, i.e. water
The joining place of lower immersed tube tunnel and man-made island, immersed tube tunnel is gradually transferred under water by waterborne, soft soil foundation buried depth thickness change compared with
Greatly, physico-mechanical properties is poor, if being easy to larger relative settlement without basement process immersed tube tunnel, ground holds
Power is carried also to be difficult to reach design requirement.Using excavation cushion, normal sands more than the method for processing foundation of immersed tube tunnel soft soil foundation
Well draining concretion method, slip casting method, pile foundation method etc..
Excavate cushion pass through to excavate, the soft layer below replacing base bottom surface, then returned with the preferable material of property
Fill out and be compacted, good artificial foundation can be formed.But underwater excavation changes and fills out that not only quantities is big, involves great expense, and substantial amounts of
Silt leakage will cause tremendous influence to marine environment.
Common sand drain draining concretion method typically uses piling prepressing, with reference to common sand drain as vertical drainage passage to weak soil
Ground is improved.By the precompressed of certain hour, weak soil intensity gradually increases, and most of sedimentation can be completed in the precompressed phase, most
Eventually design requirement is can reach after unloading.But draining concretion method process time is long, work efficiency is low, residual settlement is larger after work.
Slip casting method carries out slip casting to immersed tube tunnel base foundation by Grouting Pipe, forms injecting cement paste, it is adaptable to soft foundation,
Sedimentation can be reduced, foundation bearing capacity is improved, sand liquefaction can be also prevented.But slurry injection technique difficulty of construction is larger, the cycle is long, and deposits
In environmental protection, construction detection and quality Control.
Pile foundation method is more universal in Western European countries' application, it is adaptable to soft soil foundation, but immersed tube tunnel axis direction substrate soil
Soft or hard uneven, pile foundation is rigid structure, and immersed tube is more easy to the problem that differential settlement occurs.Additionally, pile cover installation under water is tired
It is difficult.
The pars infrasegmentalis of immersed tube tunnel transition under water generally there are the mud or silt soil strata of thickness change, and reinforcing this layer of soil is
The key of basement process, how to seek it is a kind of can it is economic and environment-friendly and meanwhile again can effectively reinforcing soft soil layer method it is most important.
The content of the invention
It is an object of the invention to overcome, difficulty of construction existing for Soft Soil Subgrade Treatment Techniques in the prior art is big, cost
It is high, long in time limit, the problems such as ambient influnence is big or deficiency, there is provided a kind of soft soil foundation reinforcing method.It is particularly a kind of to be applied to water
Lower immersed tube tunnel transition section soft soil foundation reinforcing method.The soft soil foundation reinforcing method significantly reduces underwater excavation and changes the amount of filling out simultaneously
Cost is reduced, the Soft Soil Layer of different buried depth can be effectively reinforced, is a kind of economic and environment-friendly ground while avoiding pile body age problem
Processing method.
In order to realize foregoing invention purpose, the invention provides following technical scheme：
A kind of immersed tube tunnel under water, including the Soft Soil Layer under water reinforced with sand compaction pile, and the weak soil under water is laid on successively
Block stone bed course and blotter on layer, the immersed tube tunnel laid above blotter, immersed tube tunnel top and both sides are
Backfill block stone structure.Less than the height of Soft Soil Layer under water, i.e., Soft Soil Layer passes through the laying level height of the immersed tube tunnel under water
Excavation treatment so that the Soft Soil Layer under water and block stone bed course thereon of sand compaction pile reinforcing, the aggregate level of blotter are highly
Less than the level height of the Soft Soil Layer under water of surrounding.Soft Soil Layer under water that described sand compaction pile is reinforced, block stone bed course and broken
The transverse width of stone bed course is more than the transverse width of immersed tube tunnel, to realize for the preferable supporting function of immersed tube tunnel.It is best
It is that the transverse width of the Soft Soil Layer under water that blotter, block stone bed course and sand compaction pile are reinforced increases successively, realizes trapezium structure
Supporting surface, the pressure for bearing immersed tube tunnel that can more stablize of supporting construction so that the stability of immersed tube tunnel is more preferable.
Wherein, described Soft Soil Layer under water is the conventional address of this area, is primarily referred to as subsea floor structure and excavates mud
The later structure of soft clay layer of layer.Described backfill block stone structure realizes other each faces in addition to lower surface to immersed tube tunnel
Protection is surrounded, the current scour effect under being acted on especially for undercurrent under water keeps out effect with good, can be good at
Keep the long-time stability of immersed tube tunnel.
Described, immersed tube tunnel includes the appendage of immersed tube tunnel and its laying structure under water, the body of immersed tube tunnel and
The accessory structures such as ground constitute the submerged tunnel of stabilization.Immersed tube tunnel under water of the present invention is the whole of composition immersed tube tunnel
Body laying structure, is the global concept of submerged tunnel.
Further, 1.2 ~ 2.0m of the underwater sand compaction pile diameter.The layout density of sand compaction pile is moderate, lays compacted sand
Preferably, the construction volume of sand compaction pile is also minimum for the structural stability of Soft Soil Layer under water of stake.Preferably, the replacement rate of sand compaction pile is
40%-70%。
Further, described block stone bed course is laid by the blocks of natural stone of 10 ~ 100kg or cast stone.Block stone
Volume and weight is larger, under water with good stability, the stone material layer of effect closing soft soil foundation.Preferably, it is described
Block stone bed course thickness be 1.0 ~ 3.0m.
It is existing to solve it is a further object of the present invention to provide a kind of soft soil foundation layer reinforcement means of above-mentioned immersed tube tunnel under water
The immersed tube tunnel under water having soft soil foundation layer job specfication, and immersed tube tunnel construction quality guarantee.
A kind of immersed tube tunnel changeover portion soft soil foundation reinforcing method under water, comprises the following steps：
（1）Peel off soft soil foundation（That is Soft Soil Layer under water）The mud layer on surface.
（2）To Soft Soil Layer under water（That is soft soil foundation）Lay underwater sand compaction pile.
（3）Smart digging treatment is carried out to the Soft Soil Layer under water that sand compaction pile is reinforced, block stone bed course is then laid thereon.In block
Blotter is laid on stone bed course.
The soft soil foundation of method of the present invention consolidation process, peels off the mud layer for removing soft soil foundation surface first so that
The surface of Soft Soil Layer has preliminary intensity under water, is difficult occur large-scale mud interference in work progress, and suitably
Foundation strength.Then, using sand compaction pile will reinforced soft soil ground under water, pre- depthkeeping is caused by the immersed tube bored sandstone of high pressure
The soft soil foundation densification of degree, forms the composite foundation of immersed tube tunnel sand compaction pile under water, prevents building for soft soil foundation under water
If after the completion of many decades in occur sedimentation variation.
Further, based on above-mentioned " soft soil foundation reinforcing method " the derivative laying of immersed tube tunnel under water engineering method：In step
（3）Reinforce on the soft soil foundation for completing and lay the construction that immersed tube tunnel under water is immersed tube tunnel under water.Laying accordingly
Immersed tube tunnel both sides and top spread backfill block stone closing, you can complete the laying work of immersed tube tunnel under water.
Soft soil foundation reinforcing method of the invention is particularly well-suited at the reinforced soft soil ground of immersed tube tunnel changeover portion under water
Reason, can effectively reduce the work difficulty of the treatment of reinforced soft soil ground under water, improve the efficiency reinforced, and after ensureing to reinforce
Soft soil foundation can carry submerged tunnel immersed tube after enough bracing forces be provided, it is ensured that the long time stability in tunnel
Property.
By the treatment of sand compaction pile, Soft Soil Layer density basic forming, now still retains Soft Soil Layer under water and sand under water
The easy impact mobility of stone mar.The corresponding upper block stone bed course of laying, block stone bed course is laid using block stone, and block stone is 10 ~
The blocks of natural stone of 100kg or cast stone, block stone volume and weight are larger, under water with good stability, effect envelope
Close the stone material layer of soft soil foundation.Then metalling is equipped with block stone bed course, blotter is the rubble paving of some fritters
Into rock layers, rubble can fill up the hole of block stone bed course, convenient to lay immersed tube tunnel thereon, fixed, and immersed tube tunnel
Position adjustment.
Specifically after the laying of soft soil foundation reinforcing method under water immersed tube tunnel of the invention, the underwater cross section in tunnel
Form schematic diagram should be horizontal bed course on sand compaction pile as shown in figure 1, bottom is sand compaction pile, and horizontal bed course includes
Blotter 4 on block stone bed course 3 and block stone layer.Last immersed tube tunnel 5（Immersed tunnel structure）Positioning is routed on horizontal bed course,
Connect multiple immersed tube tunnels sections after adjustment positioning, and in immersed tube tunnel upper berth last time fill block stone 6, just complete the paving of submerged tunnel
If work.
Compared with prior art, beneficial effects of the present invention：
1. a kind of immersed tube tunnel changeover portion soft soil foundation reinforcing method under water that the present invention is provided, simple structure is reasonable in design,
It is easy to promote.
2. soft soil foundation reinforcing method under water of the invention, by the sand compacted under water for laying major diameter, replacement rate high
Stake, replaces and compacted Soft Soil Layer form compound foundation, is allowed to increase the foundation bearing capacity of upper load, and settlement after construction significantly subtracts
It is small.
3. soft soil foundation reinforcing method under water of the invention, by setting the block stone bed course rammed after putting down, can be obviously reduced stake
Native load share ratio, has played stake with native respective stress to a greater degree.
4. the inventive method environmental protection and economy, convenient and quick construction, depth is big, quality controllable for treatment, cost is relatively low, have
Good economic and social benefit.
Brief description of the drawings：
Fig. 1 is the structural representation of immersed tube tunnel changeover portion soft soil foundation reinforcing method under water of the invention.
In figure：1- Soft Soil Layers, 2- sand compaction piles, 3- block stone bed courses, 4- blotters, 5- immersed tunnel structures, 6- is locked and returned
Fill block stone, A1- slightly digs face, A2- essences digging face.
Specific embodiment
It is attached in specific implementation process, soft soil foundation reinforcing method of the invention is described as follows, at reinforcing
Foundation structure after reason is divided into：Soft Soil Layer, sand compaction pile and block stone bed course, the compound ground of sand compaction pile that above three is collectively forming
Base.The Soft Soil Layer is the natural weakness uniform ground of clay, and the sand compaction pile is uniform in length and breadth along immersed tube tunnel bearing of trend
The underwater sand compaction pile of laying, described piece of stone bed course is by ramming the flat level being placed on Soft Soil Layer and sand compaction pile under water
Bed course.
Further, the underwater sand compaction pile is along the laying of immersed tube under water direction parallel arrangement.Obviously it is of the invention to squeeze under water
Close sand pile is multiple, and the compacted weak soil of sand compaction pile and corresponding part together constitutes compacted Soft Soil Layer, used as main gravity
Bearing part, sand compaction pile is arranged along the laying direction of immersed tube tunnel, effectively immersed tube tunnel is provided a supporting role.
Further, the underwater sand compaction pile is the underwater sand compaction pile uniformly laid along immersed tube tunnel bearing of trend.Most
It is well simultaneously uniform on direction in length and breadth laying, it is ensured that the uniformity of sand compaction pile.In work progress, sand compaction pile be usually earlier than
The laying work of immersed tube tunnel, it is certain it is noted that controlling the laying direction of sand compaction pile so that structural integrity is more preferable.
Further, 1.2 ~ 2.0m of the underwater sand compaction pile diameter, replacement rate is 40% ~ 70%, through Soft Soil Layer.Control
The diameter and replacement rate of sand compaction pile can be very good to control after the packing of sand compaction pile and sand compaction pile shaping most
Whole support force, it is ensured that the stability of structure has important help.
The present invention sets horizontal block stone bed course form compound foundation using sand compaction pile displacement, compacted weak soil, can be effective
Improve foundation bearing capacity, reduce work after residual settlement, reach the purpose of reinforcing soft ground, with foundation stabilization effect it is good, warp
Ji is environmentally friendly, treatment depth is big, the manageable advantage of construction quality.
Further, during the sand compaction pile material is preferably, coarse sand, its clay content should be equal to or less than 5%, can be mixed in sand material
Have a small amount of（Equal to or less than 10%）The gravel material of 5 ~ 20mm of particle diameter.During the sand compaction pile material is preferably, coarse sand, its clay content≤
5%, gravel material≤10% of 5 ~ 20mm of particle diameter in sand material.
Further, the Soft Soil Layer is the natural weakness uniform ground of clay.
Further, step（1）Described in peel off the mud layer on soft soil foundation surface, be to excavate foundation trench for the first time, for the first time
The cutting depth of foundation trench is more than 3m.The mud layer on soft soil foundation surface is peeled off, primarily with respect to the soft soil foundation knot of underwater complex
The surface of structure layer is excavated, and removes the interference effect of mud layer, improves the consolidation effect of soft soil foundation layer.
Preferably, while forming thick face of digging after controlling to excavate for the first time foundation trench in design foundation trench bottom absolute altitude above 3.0m.Base
Groove is slightly dug after completion, and sand compaction pile consolidation process is carried out to soft soil foundation.Then the Soft Soil Layer that sand compaction pile is reinforced is carried out
Smart digging treatment（Second foundation trench is excavated）, smart digging face is just constituted, as the bottom surface of design foundation trench.It is last to lay thereon accordingly
Horizontal bed course, both block stone bed course and blotter.
Construction of foundation ditch process can form thick digging face and smart digging face, and more than foundation trench bottom absolute altitude is being designed about in the thick digging face
3.0m, the smart digging face is design foundation trench bottom absolute altitude.It is attached in embodiments of the invention 1, respective figure can be with easier
This technology main points are understood, wherein the thick digging face A1 and essence digging face A2 of the excavation foundation trench for controlling, have corresponded to first time foundation trench and opened respectively
Dig and second foundation trench is excavated.
Further, described piece of stone bed course is by ramming the flat level pad being placed on Soft Soil Layer and sand compaction pile under water
Layer.I.e. block stone bed course is by ramming the flat horizontal bed course being placed on the Soft Soil Layer that sand compaction pile is reinforced under water.Block stone bed course
It is main enclosed construction, by ramming flat treatment under water, the sealing process of block stone bed course more preferably, preferably maintains sand compaction pile
Structural stability.
Further, described piece of stone bed course is by throwing waterborne and through ramming flat shape under water into 1.0 ~ 3.0m of thickness is placed in weak soil
On layer and sand compaction pile.The thickness control of block stone bed course can well ensure the Stability Analysis of Structures of block stone bed course in 1.0 ~ 3.0m
Property and for the sealing process of sand compaction pile foundation structure below.
Further, the block stone material that described piece of stone bed course is used is 10 ~ 100kg building stones for monolithic quality, and building stones are in water
Intensity after being impregnated with is not less than 50MPa.Block stone bed course is the building stones being directly enclosed on the soft soil foundation layer of sand compaction pile solidification,
Its monolithic quality and intensity should keep higher, because needing to keep its structure under the pressure of the immersed tube tunnel for bearing afterwards
Integrality, to realize effective supporting role of immersed tube tunnel.
Further, block stone bed course rams flat under water using hydraulic vibration driver.Hydraulic vibration driver rams flat strength greatly under water, rams flat
Effect is good, and cost is extremely low.
Parameters of construction technology in above-mentioned specific embodiment can also lay directly as immersed tube tunnel under water
The restriction explanation of structure, might not be limited in above-mentioned engineering method, because the special parameter in construction inherently can be direct
Remain into the middle of corresponding construction results.
With reference to test example and specific embodiment, the present invention is described in further detail.But this should not be understood
For the scope of above-mentioned theme of the invention is only limitted to following embodiment, all technologies realized based on present invention belong to this
The scope of invention.
Embodiment 1
As shown in figure 1, the schematic cross-section of seabed immersed tube tunnel, Soft Soil Layer 1 is excavated the thick digging face A2 of formation, in thick groove face
Bottom Soft Soil Layer is reinforced by sand compaction pile 2, forms sand compaction pile portion.Essence is carried out to the Soft Soil Layer that sand compaction pile is reinforced and digs treatment shape
Into smart digging face A1.It is block stone bed course 3 above sand compaction pile portion, is blotter 4 in the top of block stone bed course 3.Immersed tube knot
Structure 5 is laid on the top of blotter 4, and is filled with locking and backfilling block stone 6.
The sand compaction pile composite foundation that Soft Soil Layer 1, sand compaction pile 2 and block stone bed course 3 are formed, the Soft Soil Layer 1 is day
The right weakness uniform ground of clay, the sand compaction pile 2 is the sand compacted under water uniformly laid in length and breadth along immersed tube tunnel bearing of trend
Stake, described piece of stone bed course 3 is by ramming the flat horizontal bed course being placed on Soft Soil Layer and sand compaction pile under water.Blotter 4
On block stone bed course 3, immersed tunnel structure 5 is located on blotter 4, is finally locked and is backfilled block stone 6 and be located at immersed tunnel structure 5
Around.Both it had been the overall structure of seabed immersed tube tunnel of the invention.
Further, construction method of the invention is illustrated with reference to specific construction note.
Immersed tube tunnel changeover portion reinforced soft soil ground under water, with reference to shown in Fig. 1, its specific work process is：
S1, immersed tube tunnel basic engineering, using sand compaction pile composite foundation, after determining immersed tube tunnel design foundation bearing capacity, work
Residual settlement and relative settlement requirement, reinforcing scope, reinforcement depth and replacement rate（It is determined that stake footpath and stake spacing）.
S2, immersed tube tunnel foundation trench slightly dig, and form thick digging face A1.
Wherein, the thick face A1 that digs is in design foundation trench bottom absolute altitude above 3.0m.
S3, in Soft Soil Layer 1 using construction process of underwater sand compaction pile formed sand compaction pile 2.
Wherein, 2 1.2 ~ 2.0m of footpath of sand compaction pile, replacement rate is 40% ~ 70%, and big replacement rate sand compaction pile composite foundation can
Meet the design requirement of immersed tube tunnel foundation bearing capacity, residual settlement and relative settlement；The stake top absolute altitude of sand compaction pile 2 should not be low
More than the absolute altitude of design foundation trench bottom at one times of sand compaction pile stake footpath；The stake bottom absolute altitude of sand compaction pile 2 preferably penetrates Soft Soil Layer 1, and
Into the hard stratum of lower sleeping certain depth；When stake bottom absolute altitude reaches design stake bottom absolute altitude, if the injection speed of sand pile sleeve pipe
Occur continuing 10s being not more than 1.0m/min, and sand pile set ttom of pipe absolute altitude with design stake bottom absolute altitude difference when being not more than 3.0m, can stop
Only sand pile sleeve pipe injection and in this, as stake bottom absolute altitude.
S4, immersed tube tunnel foundation trench essence are dug, and form essence digging face A2.
Wherein, smart digging face A2 is design foundation trench bottom absolute altitude；Foundation trench essence is dug and should remove underwater sand compaction pile work progress hogging
The mud for rising, it is ensured that subsequent block stone bed course is free of sludge interlayer 3 times.
S5, fill block stone throwing are gone forward side by side and ram under water-filling flat, form block stone bed course 3.
Wherein, 1.0 ~ 3.0m of throwing thickness, 10 ~ 100kg block stones, should be according to design requirement, construction ability, tidal level and wave shadow
Ring, it is determined that layering and section construction order；The block stone bed course for ramming after putting down under water should meet correlated quality acceptance criteria and specification will
Ask.
Also include before step S4 after embodiment of the present invention step S3：
Pile body compactness inspection should be carried out after the completion of step S3', sand compaction pile construction, to determine or readjust design foundation trench bottom
Absolute altitude；When the SPT blow count for detecting the design foundation trench bottom following pile body of absolute altitude is less than standard value（Average SPT blow count is not less than 20
Hit, average SPT blow count hits not less than 12 in the range of stake top 2.0m）When, should supplement and set sand compaction pile；When detecting design base
The SPT blow count of the following pile body of bottom land absolute altitude is more than or equal to standard value（Average SPT blow count hits not less than 20, stake top 2.0m models
Interior average SPT blow count is enclosed to be hit not less than 12）Shi Jinhang steps S4.
Embodiments of the invention are illustrated with reference to Fig. 1, wherein the surface excavated for the first time reaches A1 faces, by weak soil ground
Mud layer on base is to stripping so that mud interference discharge under water, because mud is unformed cannot also to reinforce qualitative, directly
Connect to be peeled off and expose soft soil foundation layer.It is full soft soil foundation layer under A1 faces, now the soft soil foundation layer to A1 faces squeezes into water
Lower sand compaction pile, you can realize the basic solidification for the bottom of laying immersed tube tunnel later.By the solidification of sand compaction pile
The Soft Soil Layer ground of immersed tube tunnel has obtained sufficient solidification under water, soft soil foundation essence is dug again then and reaches A2 faces.At smart digging
The packing that reason is primarily due to sand compaction pile sand compaction pile of soft soil foundation surface portion in construction is relatively low, and essence is excavated soft
The part of soil primary surface, the actual packing of the further soft soil foundation layer for improving sand compaction pile treatment.Now in A2 faces
The upper block stone bed course of last time laying and blotter are used as closing so that the base fixed reliability of immersed tube tunnel laying.Such as Fig. 1 institutes
Show, after immersed tube tunnel has laid, immersed tube tunnel 5 is closed, the immersed tube tunnel cross section structure of formation shows, immersed tube
The various pieces in tunnel are all closed well, belong to half embedded structure, and it is good to wash away resistance for ocean current under water.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of the technology of the present invention principle is not departed from, some improvement and replacement can also be made, these improve and replace
Also should be regarded as protection scope of the present invention.
Claims (10)
1. one kind immersed tube tunnel under water, including the Soft Soil Layer under water reinforced with sand compaction pile, and be laid on successively described soft under water
Block stone bed course and blotter on soil layer；
The immersed tube tunnel laid above blotter, immersed tube tunnel top and both sides are backfill block stone structures；
Height of the laying level height of the immersed tube tunnel less than Soft Soil Layer under water；
The transverse width of the described Soft Soil Layer under water, block stone bed course and blotter reinforced with sand compaction pile is more than immersed tube tunnel
Transverse width.
2. immersed tube tunnel under water as claimed in claim 1, it is characterised in that blotter, block stone bed course and sand compaction pile are reinforced
The transverse width of Soft Soil Layer under water increase successively.
3. immersed tube tunnel under water as claimed in claim 1, it is characterised in that 1.2 ~ 2.0m of the underwater sand compaction pile diameter.
4. immersed tube tunnel under water as claimed in claim 1, it is characterised in that described block stone bed course is by the natural of 10 ~ 100kg
What stone or cast stone laid.
5. immersed tube tunnel under water as claimed in claim 1, it is characterised in that the thickness of described block stone bed course is 1.0 ~ 3.0m.
6. one kind immersed tube tunnel changeover portion soft soil foundation reinforcing method under water, comprises the following steps：
（1）Peel off the mud layer on soft soil foundation surface；
（2）Underwater sand compaction pile is laid to Soft Soil Layer under water；
（3）Smart digging treatment is carried out to the Soft Soil Layer under water that sand compaction pile is reinforced, block stone bed course is then laid thereon；In block stone pad
Blotter is laid on layer.
7. immersed tube tunnel changeover portion soft soil foundation reinforcing method under water as claimed in claim 6, it is characterised in that described to squeeze under water
Close sand pile is the underwater sand compaction pile uniformly laid along immersed tube tunnel bearing of trend.
8. immersed tube tunnel changeover portion soft soil foundation reinforcing method under water as claimed in claim 6, it is characterised in that described to squeeze under water
1.2 ~ 2.0m of close sand pile diameter, replacement rate is 40% ~ 70%.
9. immersed tube tunnel changeover portion soft soil foundation reinforcing method under water as claimed in claim 6, it is characterised in that the compacted sand
During pile material is preferably, coarse sand, its clay content≤5%, gravel material≤10% of 5 ~ 20mm of particle diameter in sand material.
10. immersed tube tunnel changeover portion soft soil foundation reinforcing method under water as claimed in claim 6, it is characterised in that based on above-mentioned
" soft soil foundation reinforcing method " the derivative laying of immersed tube tunnel under water engineering method：In claim 6 step（3）Reinforce the soft of completion
The construction that immersed tube tunnel under water is immersed tube tunnel under water is laid on soil base；Accordingly in the both sides of the immersed tube tunnel for laying
And the stone closing of backfill block is spread at top, you can complete the laying work of immersed tube tunnel under water.
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| CN201710200234.4A CN106884427A (en) | 2017-03-30 | 2017-03-30 | Immersed tube tunnel and immersed tube tunnel changeover portion soft soil foundation reinforcing method under water |
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| CN201710200234.4A CN106884427A (en) | 2017-03-30 | 2017-03-30 | Immersed tube tunnel and immersed tube tunnel changeover portion soft soil foundation reinforcing method under water |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107663865A (en) * | 2017-11-14 | 2018-02-06 | 山东大学 | A kind of cable-stayed type immersed tube tunnel structure and method |
| CN108086348A (en) * | 2018-02-01 | 2018-05-29 | 中交第四航务工程勘察设计院有限公司 | A kind of immersed tube tunnel combined foundation and setting method |
| CN108343088A (en) * | 2018-05-16 | 2018-07-31 | 上海市城市建设设计研究总院（集团）有限公司 | Without earthing along river open trench tunnel structure |
| CN111472359A (en) * | 2020-03-19 | 2020-07-31 | 中国二十冶集团有限公司 | Method for replacing and filling peat soil soft foundation box culvert foundation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107663865A (en) * | 2017-11-14 | 2018-02-06 | 山东大学 | A kind of cable-stayed type immersed tube tunnel structure and method |
| CN107663865B (en) * | 2017-11-14 | 2024-03-05 | 山东大学 | Inclined-pulling immersed tube tunnel structure and method |
| CN108086348A (en) * | 2018-02-01 | 2018-05-29 | 中交第四航务工程勘察设计院有限公司 | A kind of immersed tube tunnel combined foundation and setting method |
| CN108343088A (en) * | 2018-05-16 | 2018-07-31 | 上海市城市建设设计研究总院（集团）有限公司 | Without earthing along river open trench tunnel structure |
| CN108343088B (en) * | 2018-05-16 | 2023-07-04 | 上海市城市建设设计研究总院（集团）有限公司 | Non-earthing open cut tunnel structure along river |
| CN111472359A (en) * | 2020-03-19 | 2020-07-31 | 中国二十冶集团有限公司 | Method for replacing and filling peat soil soft foundation box culvert foundation |
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Application publication date: 20170623 |