CN109695250A - A kind of deep soft soil layer major diameter open caisson construction method - Google Patents

A kind of deep soft soil layer major diameter open caisson construction method Download PDF

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Publication number
CN109695250A
CN109695250A CN201910128322.7A CN201910128322A CN109695250A CN 109695250 A CN109695250 A CN 109695250A CN 201910128322 A CN201910128322 A CN 201910128322A CN 109695250 A CN109695250 A CN 109695250A
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China
Prior art keywords
open caisson
caisson
construction
mixing pile
soft soil
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CN201910128322.7A
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Chinese (zh)
Inventor
雷斌
叶坤
王志权
张工
沙桢辉
李波
周梅峰
雷帆
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Shenzhen Gongkan Geotechnical Group Co Ltd
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Shenzhen Gongkan Geotechnical Group Co Ltd
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Application filed by Shenzhen Gongkan Geotechnical Group Co Ltd filed Critical Shenzhen Gongkan Geotechnical Group Co Ltd
Priority to CN201910128322.7A priority Critical patent/CN109695250A/en
Publication of CN109695250A publication Critical patent/CN109695250A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D23/00Caissons; Construction or placing of caissons
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil

Abstract

The invention discloses a kind of deep soft soil layer major diameter open caisson construction methods, including construction procedure below: preparation of construction, including material prepares and equipment prepares;Cement mixing pile is set, along caisson wall injection deep cement-mixed pile, so that deep soft soil layer form compound foundation;Injected hole is set, opens up injected hole in cement mixing pile peripheral hardware;Excavation of foundation pit, according to drawing on composite foundation excavation pit;Make open caisson;Open caisson excavates, and open caisson is segmented sinking by the way of two sequences excavation;Back cover construction after open caisson stabilization sinks down into designed elevation, carries out back cover construction to open caisson bottom.This kind of deep soft soil layer major diameter open caisson construction method can place the generation of situations such as open caisson super heavy, inclination of open caisson, have the advantages that not available for the prior arts such as implementation cost is low, enforcement difficulty is low, safe and reliable, construction quality is good.

Description

A kind of deep soft soil layer major diameter open caisson construction method
Technical field
The present invention relates to a kind of engineering construction method, especially a kind of deep soft soil layer major diameter open caisson construction method.
Background technique
Open caisson is the underground structure of pit shaft shape, and when construction is general to be first fabricated to the works of a pit shaft shape in earth's surface, Then caisson structure self weight (or under imposed load effect) is borrowed to overcome and soil by constantly cutting the earth out of well under the going along with sb. to guard him of the borehole wall Resistance native under frictional force and blade foot, makes open caisson gradually sink between wall;After reaching predetermined design absolute altitude, then carry out back cover, structure Build internal structure.Open caisson is usually in foundation pit, sewage pumping station, the large equipment base, people's air defense shelter, shield of construction Bridge Piers It is used when assembled well, upper pipe working well or received well, underground driveway and station water conservancy project foundation construction enclosure device.This method is not only Have the characteristics that construction is simple, speed are fast, safe and reliable, also with small to surrounding constructure influence, occupied area is small, shoveling amount The advantages that few.
When open caisson is constructed under the conditions of the Soft Clays such as mud, muck soil, peat, cumulosol, since Soft Soil Layer mentions The frictional force and Lack of support of confession are easy to appear that well sinking amplitude is excessive, open caisson in the case where caisson structure size is big The problems such as inclination correction is difficult, influences construction quality.
In view of this, the purpose of the present invention is to provide a kind of new technical solutions to solve existing technological deficiency.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of deep soft soil layer major diameter open caisson construction method, It solves open caisson in the prior art and is easy to appear that sinking control difficulty is big, sinking amplitude is excessive in deep soft soil layer construction, And the technical problems such as Deviation Rectification for Open Caisson difficulty.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of deep soft soil layer major diameter open caisson construction method, including construction procedure below:
Step 1: preparation of construction, including material prepares and equipment prepares;
Step 2: setting cement mixing pile, along caisson wall injection deep cement-mixed pile, so that deep soft soil layer shape At composite foundation;
Step 3: setting injected hole opens up injected hole in cement mixing pile peripheral hardware;
Step 4: excavation of foundation pit, according to drawing on composite foundation excavation pit;
Step 5: production open caisson;
Step 6: open caisson excavates, and open caisson is segmented sinking by the way of two sequences excavation;
Step 7: back cover construction after open caisson stabilization sinks down into designed elevation, carries out back cover construction to open caisson bottom.
As an improvement of the above technical solution, in implementation steps two, if being equably arranged in caisson cutting edge bottom in advance Dry deep cement-mixed pile increases caisson cutting edge end Bearing Capacity of Composite Foundation, improves the end resistance and the borehole wall of caisson cutting edge Side friction;Upper soil horizon can be used as empty stake, lower part soft soil layer Duan Weishi, cement mixing pile in cement mixing pile driving construction Stake bottom absolute altitude is more than that Sinking Well Design bottom absolute altitude is no less than 2m;Cement mixing pile stake diameter can select diameter 500 according to open caisson wall thickness Or 600mm.
As a further improvement of the above technical scheme, in implementation steps three, injected hole is abutted along caisson wall outer rim The setting of open caisson outer wall, increases open caisson external wall friction power, to play the role of controlling well sinking speed;Injected hole aperture is About 1.0~1.5m is arranged in 50mm, pitch of holes, and bored grouting depth is consistent with cement mixing pile stake bottom depth.
As a further improvement of the above technical scheme, in implementation steps four, the excavation of foundation pit depth about 1 of open caisson operation ~2m, the slope gradient are 1:1, and bottom of foundation ditch sideline is from open caisson outer wall 2m or so;Pit earthwork can be used backhoe and be excavated, and match It closes and manually repairs slope and smooth side slope and hole bottom, reuse dump truck for the soil dug out and transport to the stacking of specified spoir receiving place; When excavation of foundation pit is close to designed elevation, ground at blade foot is handled well, desurfacing loosens the soil, and the granulated slag that rockfills is changed, in mountain flour slag It is laid with chock in upper blade foot, prevents that differential settlement occurs during next step open caisson manufacture.
As a further improvement of the above technical scheme, in implementation steps five, including working procedure below:
5.1, it determines that open caisson pours number: according to site condition live after excavation of foundation pit, determining that merogenesis pours open caisson in advance Number;
5.2, blade foot plain concrete cushion layer pours: carrying out plain concrete cushion layer formwork in boundary of works area and pours;
5.3, blade foot construct: according to drawing or check determine blade foot be arranged type, according to drawing and mat surface mark into The binding of row blade foot reinforcing bar, formwork and concreting;
5.4, open caisson scaffold building: double ground steel pipe scaffold is arranged in open caisson periphery, needs to be expired on the inside of open caisson Hall scaffold building;
5.5, open caisson template is installed: before the installation of open caisson template, being checked according to specification, installs open caisson mould after checking computations are qualified Plate;
5.6, the borehole wall pours: borehole wall placement layer by layer is carried out after template is checked and accepted, every layer pours 30~50cm, can basis Casting concrete amount is poured using more pump trucks simultaneously, and is vibrated.
As a further improvement of the above technical scheme, in implementation steps six, each section of well sinking is all made of two sequences Mixing pile is divided into 12 sections by open caisson circumferencial direction by digging mode, and in a sequence, successively interval abolishes 12 sections to uniform intervals paragraph by paragraph 6 sections of cement mixing piles in cement mixing pile, and the synchronous sand pocket displacement support top in position is abolished at cement mixing pile interval;Two In sequence, 6 sections of this layer of residue of cement mixing pile is abolished, while abolishing the sand pocket that a tagmeme is set, open caisson bottom relies on border at this time Sand pocket support top;Finally, the sandbox using sand pocket acts on, realizes safe, uniform, the controlled sinking of open caisson, prevent from substantially sinking and inclining Tiltedly;When filling sand pocket, sand pocket should be fitted closely with blade foot and mixing pile;The cement mixing pile is abolished thickness every time and is no more than 0.5m;The above process is repeated several times and makes well sinking to designed elevation.
The beneficial effects of the present invention are: the present invention provides a kind of deep soft soil layer major diameter open caisson construction method, it should Kind deep soft soil layer major diameter open caisson construction method is provided with cement mixing pile and injected hole in construction, can provide for open caisson The resistance of group structure, avoids well sinking position super heavy;It is set during well sinking using second order alternation excavation and pre-buried sandbag The mode changed carries out segmentation sinking, it can be ensured that open caisson guarantees that within the scope of the vertical missing of control, open caisson is not in sinking watching It will appear inclination of open caisson bias phenomenon, effectively promote the construction quality of open caisson.
In short, this kind of deep soft soil layer major diameter open caisson construction method, solve in the prior art open caisson deep soft It is easy to appear that sinking control difficulty is big, sinking amplitude is excessive in the construction of soil layer and the technologies such as Deviation Rectification for Open Caisson difficulty is asked Topic.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is method and step flow chart of the invention;
Fig. 2 is working procedure flow chart of the invention;
Fig. 3 is the plane figure schematic diagram of cement mixing pile in the present invention;
Fig. 4 is the sectional elevation structural schematic diagram of cement mixing pile in the present invention;
Fig. 5 is the plane figure schematic diagram of injected hole in the present invention;
Fig. 6 is the sectional elevation structural schematic diagram of injected hole in the present invention;
Sectional elevation structural schematic diagram when Fig. 7 is excavation pit in the present invention;
Fig. 8 is the planar structure schematic diagram in the present invention after the completion of open caisson manufacture;
Fig. 9 is the sectional elevation structural schematic diagram in the present invention after the completion of open caisson manufacture;
Figure 10 is planar structure schematic diagram when carrying out sequence construction in the present invention in caisson sinking construction;
Figure 11 is sectional elevation structural schematic diagram when carrying out sequence construction in the present invention in caisson sinking construction;
Figure 12 is planar structure schematic diagram when carrying out the construction of two sequences in the present invention in caisson sinking construction;
Figure 13 is sectional elevation structural schematic diagram when carrying out the construction of two sequences in the present invention in caisson sinking construction;
Figure 14 is that open caisson uniformly sinks the sectional elevation structural schematic diagram after one section in caisson sinking construction in the present invention;
Figure 15 is the sectional elevation structural schematic diagram in the present invention after well sinking to designed elevation.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to design of the invention, specific structure and generation clear Chu is fully described by, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair Bright a part of the embodiment, rather than whole embodiments, based on the embodiment of the present invention, those skilled in the art are not being paid Other embodiments obtained, belong to the scope of protection of the invention under the premise of creative work.In addition, being related in patent All connection/connection relationships, not singly refer to that component directly connects, and refer to can according to specific implementation situation, by addition or Reduce couple auxiliary, Lai Zucheng more preferably coupling structure.Each technical characteristic in the invention, in not conflicting conflict Under the premise of can with combination of interactions, referring to Fig.1-15.
A kind of deep soft soil layer major diameter open caisson construction method, including construction procedure below:
Step 1: preparation of construction, including material prepares and equipment prepares;
Step 2: setting cement mixing pile, along caisson wall injection deep cement-mixed pile, so that deep soft soil layer shape At composite foundation;
Step 3: setting injected hole opens up injected hole in cement mixing pile peripheral hardware;
Step 4: excavation of foundation pit, according to drawing on composite foundation excavation pit;
Step 5: production open caisson;
Step 6: open caisson excavates, and open caisson is segmented sinking by the way of two sequences excavation;
Step 7: back cover construction after open caisson stabilization sinks down into designed elevation, carries out back cover construction to open caisson bottom.
Preferably, in implementation steps two, several deep-cement stirrings is equably set in caisson cutting edge bottom in advance Stake increases caisson cutting edge end Bearing Capacity of Composite Foundation, improves the end resistance of caisson cutting edge and the side friction of the borehole wall;Cement stirs Mixing pile driving construction can be used upper soil horizon as empty stake, and lower part soft soil layer Duan Weishi, cement mixing pile stake bottom absolute altitude is more than open caisson Design bottom absolute altitude is no less than 2m;Cement mixing pile stake diameter can select diameter 500 or 600mm according to open caisson wall thickness.
Preferably, in implementation steps three, injected hole is arranged along caisson wall outer rim against open caisson outer wall, increases outside open caisson Wall friction power, to play the role of controlling well sinking speed;Injected hole aperture is 50mm, and about 1.0~1.5m is arranged in pitch of holes, Bored grouting depth is consistent with cement mixing pile stake bottom depth.
Preferably, in implementation steps four, excavation of foundation pit depth about 1~2m of open caisson operation, the slope gradient is 1:1, base Bottom sideline is cheated from open caisson outer wall 2m or so;Pit earthwork can be used backhoe and be excavated, and slope and smooth side slope are manually repaired in cooperation With hole bottom, dump truck is reused by the soil dug out and transports to the stacking of specified spoir receiving place;It is close to design in excavation of foundation pit When absolute altitude, ground at blade foot is handled well, desurfacing loosens the soil, and changes the granulated slag that rockfills, and is laid with chock in blade foot on mountain flour slag, prevents Differential settlement occurs during next step open caisson manufacture.
Preferably, in implementation steps five, including working procedure below:
5.1, it determines that open caisson pours number: according to site condition live after excavation of foundation pit, determining that merogenesis pours open caisson in advance Number;
5.2, blade foot plain concrete cushion layer pours: carrying out plain concrete cushion layer formwork in boundary of works area and pours;
5.3, blade foot construct: according to drawing or check determine blade foot be arranged type, according to drawing and mat surface mark into The binding of row blade foot reinforcing bar, formwork and concreting;
5.4, open caisson scaffold building: double ground steel pipe scaffold is arranged in open caisson periphery, needs to be expired on the inside of open caisson Hall scaffold building;
5.5, open caisson template is installed: before the installation of open caisson template, being checked according to specification, installs open caisson mould after checking computations are qualified Plate;
5.6, the borehole wall pours: borehole wall placement layer by layer is carried out after template is checked and accepted, every layer pours 30~50cm, can basis Casting concrete amount is poured using more pump trucks simultaneously, and is vibrated.
Preferably, in implementation steps six, each section of well sinking is all made of two sequence digging modes, by open caisson circumferencial direction Mixing pile is divided into 12 sections, in a sequence, uniform intervals 6 sections of cement that successively interval is abolished in 12 sections of cement mixing piles paragraph by paragraph are stirred Stake is mixed, and abolishes the synchronous sand pocket displacement support top in position at cement mixing pile interval;In two sequences, 6 sections of this layer of residue are abolished Cement mixing pile, while the sand pocket that a tagmeme is set is abolished, open caisson bottom relies on border sand pocket support top at this time;Finally, utilizing sand pocket Sandbox effect, realize safe, uniform, the controlled sinking of open caisson, prevent from substantially sinking and tilting;When filling sand pocket, sand pocket should be with Blade foot and mixing pile fit closely;The cement mixing pile abolishes thickness no more than 0.5m every time;The above process is repeated several times simultaneously So that well sinking is to designed elevation.
When the present invention is embodied:
One, along open caisson wall injection deep cement-mixed pile, referring in particular to Fig. 3, Fig. 4.
1, a certain number of deep cement-mixed piles 1 are equably set in caisson cutting edge bottom in advance, increase caisson cutting edge End Bearing Capacity of Composite Foundation improves the end resistance of caisson cutting edge and the side friction of the borehole wall, prevents open caisson super heavy.
2, to save construction cost, upper soil horizon is can be used as empty stake in the construction of cement mixing pile 1, and lower part soft soil layer section is Real stake, 1 stake bottom absolute altitude of cement mixing should be more than that Sinking Well Design bottom absolute altitude is no less than 2m.
3,1 diameter of cement mixing pile can select diameter 500 or 600mm according to open caisson wall thickness.
Two, 1 outside bored grouting of cement mixing pile forms injected hole 2, referring in particular to Fig. 5, Fig. 6.
1, injected hole 2 is arranged along open caisson wall outer rim against open caisson outer wall, it is therefore an objective to improve caisson wall periphery weak soil body Mechanical property increases open caisson external wall friction power, to play the role of controlling well sinking speed.
2,2 aperture of injected hole is 50mm, and about 1.0~1.5m is arranged in pitch of holes, and bored grouting depth is the same as 1 bottom depth of mixing pile Degree.
Three, excavation of foundation pit, referring in particular to Fig. 7.
1, foundation pit 3 cutting depth about 1~2m of open caisson operation, the slope gradient are 1:1, and bottom of foundation ditch sideline is from open caisson outer wall 2m or so.
2, it backhoe can be used is excavated for 3 cubic metres of earth of foundation pit, slope and smooth side slope and hole bottom are manually repaired in cooperation, reuse self-unloading The soil dug out is transported to specified spoir receiving place and stacked by automobile.
3, when foundation pit 3 is excavated close to designed elevation 31, ground at blade foot is handled well, desurfacing loosens the soil, and changes and rockfills Granulated slag is laid with chock in blade foot on mountain flour slag, prevents that differential settlement occurs during next step open caisson manufacture.
Four, open caisson is made, referring in particular to Fig. 8, Fig. 9.
1, open caisson 4 pours number: live site condition after being excavated according to foundation pit 3 determines that merogenesis pours time of open caisson in advance Number.
2, blade foot plain concrete cushion layer pours: carrying out plain concrete cushion layer formwork in boundary of works area, pours.
3, blade foot is constructed: according to drawing or being checked determining blade foot setting type, is carried out according to drawing and mat surface label The binding of blade foot reinforcing bar, formwork and concreting.
4, open caisson scaffold building: double ground steel pipe scaffold is arranged in open caisson periphery, needs to carry out full hall on the inside of open caisson Scaffold building.
5, open caisson template is installed: before the installation of open caisson template, it is necessary to be checked according to relevant regulations specification.
6, the borehole wall pours: borehole wall placement layer by layer is carried out after template is checked and accepted, every layer pours 30~50cm, can be according to pouring It builds amount of concrete while being poured using more pump trucks, and vibrate.
Five, 4 inner excavation of open caisson takes soil, and at pleasure 1 two sequence of mixing pile is excavated under open caisson 4, referring in particular to Figure 10, Figure 11, figure 12, Figure 13.
1, each section of open caisson 4 sinks to using two sequence digging modes, and dividing cement mixing pile 1 by 4 circumference of open caisson is 12 sections, and one Successively 6 sections of cement mixing pile 1 in 12 sections is abolished at interval to sequence uniform intervals paragraph by paragraph, and abolishes position at the interval of cement mixing pile 1 Set the synchronous displacement support top of sand pocket 5;Two sequences abolish 6 sections of this layer of residue of cement mixing pile 1, while abolishing the sand pocket that a tagmeme is set 5, open caisson bottom relies on 5 support top of border sand pocket at this time;Finally, the sandbox using sand pocket 5 acts on, realize the safety of open caisson 4, uniformly, Controlled sinking prevents from substantially sinking and tilting.
2, when filling sand pocket 5, sand pocket 5 should be fitted closely with blade foot and cement mixing pile.
3, cement mixing pile 1 abolishes thickness no more than 0.5m every time, prevents open caisson from abolishing unevenly because of cement mixing pile And it tilts.
Six, support top sand pocket 5 uniformly is abolished, completes the uniform sinking of one section of open caisson 4, and repeat the construction of the five, the six steps, until Open caisson 4 sinks down into designed elevation 31, referring in particular to Figure 14, Figure 15.
Seven, after open caisson 4 sinks down into designed elevation 31, back cover construction is carried out to 4 shaft bottom of open caisson.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.

Claims (6)

1. a kind of deep soft soil layer major diameter open caisson construction method, it is characterised in that: including construction procedure below:
Step 1: preparation of construction, including material prepares and equipment prepares;
Step 2: setting cement mixing pile, along caisson wall injection deep cement-mixed pile, so that deep soft soil layer is formed again Close ground;
Step 3: setting injected hole opens up injected hole in cement mixing pile peripheral hardware;
Step 4: excavation of foundation pit, according to drawing on composite foundation excavation pit;
Step 5: production open caisson;
Step 6: open caisson excavates, and open caisson is segmented sinking by the way of two sequences excavation;
Step 7: back cover construction after open caisson stabilization sinks down into designed elevation, carries out back cover construction to open caisson bottom.
2. a kind of deep soft soil layer major diameter open caisson construction method according to claim 1, it is characterised in that: implementing When step 2, several deep cement-mixed piles is equably set in caisson cutting edge bottom in advance, it is multiple to increase caisson cutting edge end Foundation bearing capacity is closed, the end resistance of caisson cutting edge and the side friction of the borehole wall are improved;Top soil can be used in cement mixing pile driving construction Layer is empty stake, and lower part soft soil layer Duan Weishi, cement mixing pile stake bottom absolute altitude is more than that Sinking Well Design bottom absolute altitude is no less than 2m;Water Mud mixing pile stake diameter can select diameter 500 or 600mm according to open caisson wall thickness.
3. a kind of deep soft soil layer major diameter open caisson construction method according to claim 1, it is characterised in that: implementing When step 3, injected hole is arranged along caisson wall outer rim against open caisson outer wall, increases open caisson external wall friction power, heavy to play control The effect of well subsidence velocity;Injected hole aperture is 50mm, and 1.0~1.5m, bored grouting depth and cement mixing is arranged in pitch of holes Stake stake bottom depth is consistent.
4. according to a kind of deep soft soil layer major diameter open caisson construction method described in claim 1, it is characterised in that: implementing to walk When rapid four, excavation of foundation pit depth about 1~2m of open caisson operation, the slope gradient is 1:1, and bottom of foundation ditch sideline is left from open caisson outer wall 2m It is right;Pit earthwork can be used backhoe and be excavated, and slope and smooth side slope and hole bottom are manually repaired in cooperation, and reusing dump truck will dig Soil out transports to the stacking of specified spoir receiving place;When excavation of foundation pit is close to designed elevation, ground at blade foot is handled well, clearly Skim-coat loosens the soil, and changes the granulated slag that rockfills, and is laid with chock in blade foot on mountain flour slag, prevents from occurring not during next step open caisson manufacture Uniform settlement.
5. according to a kind of deep soft soil layer major diameter open caisson construction method described in claim 1, it is characterised in that: implementing to walk When rapid five, including working procedure below:
5.1, it determines that open caisson pours number: according to site condition live after excavation of foundation pit, determining that merogenesis pours time of open caisson in advance Number;
5.2, blade foot plain concrete cushion layer pours: carrying out plain concrete cushion layer formwork in boundary of works area and pours;
5.3, blade foot is constructed: according to drawing or being checked determining blade foot setting type, is carried out sword according to drawing and mat surface label The binding of foot reinforcing bar, formwork and concreting;
5.4, open caisson scaffold building: double ground steel pipe scaffold is arranged in open caisson periphery, needs to carry out full hall foot on the inside of open caisson Hand cradle is set up;
5.5, open caisson template is installed: before the installation of open caisson template, being checked according to specification, installs open caisson template after checking computations are qualified;
5.6, the borehole wall pours: borehole wall placement layer by layer is carried out after template is checked and accepted, every layer pours 30~50cm, can be according to pouring Amount of concrete is poured using more pump trucks simultaneously, and is vibrated.
6. according to a kind of deep soft soil layer major diameter open caisson construction method described in claim 1, it is characterised in that: implementing to walk When rapid six, each section of well sinking is all made of two sequence digging modes, mixing pile is divided into 12 sections by open caisson circumferencial direction, in a sequence In, successively 6 sections of cement mixing piles in 12 sections of cement mixing piles are abolished at interval to uniform intervals paragraph by paragraph, and at cement mixing pile interval Abolish the synchronous sand pocket displacement support top in position;In two sequences, 6 sections of this layer of residue of cement mixing pile is abolished, while abolishing a sequence The sand pocket of position, open caisson bottom relies on border sand pocket support top at this time;Finally, the sandbox using sand pocket acts on, realization open caisson safety, Uniformly, controlled sinking prevents from substantially sinking and tilting;When filling sand pocket, sand pocket should be fitted closely with blade foot and mixing pile;It is described Cement mixing pile abolishes thickness no more than 0.5m every time;The above process is repeated several times and makes well sinking to designed elevation.
CN201910128322.7A 2019-02-21 2019-02-21 A kind of deep soft soil layer major diameter open caisson construction method Pending CN109695250A (en)

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Publication number Priority date Publication date Assignee Title
CN111042171A (en) * 2019-12-26 2020-04-21 天津市赛英工程技术咨询有限公司 Open caisson construction method suitable for silt soft soil foundation and high underground water level
CN112176806A (en) * 2020-10-16 2021-01-05 于胜泉 Stable road soft foundation treatment method and matched soft foundation treatment construction system

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CN102493367A (en) * 2011-12-06 2012-06-13 中铁六局集团有限公司 Non-blasting construction method for dismantling pier to land bridge
CN102587401A (en) * 2012-03-26 2012-07-18 上海亚同环保实业股份有限公司 Sinking construction method for open caisson in geological sludge layer under saturated water condition
CN106958256A (en) * 2017-03-22 2017-07-18 中建四局第五建筑工程有限公司 A kind of placement layer by layer, the open caisson construction technique repeatedly sunk

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Publication number Priority date Publication date Assignee Title
CN111042171A (en) * 2019-12-26 2020-04-21 天津市赛英工程技术咨询有限公司 Open caisson construction method suitable for silt soft soil foundation and high underground water level
CN112176806A (en) * 2020-10-16 2021-01-05 于胜泉 Stable road soft foundation treatment method and matched soft foundation treatment construction system
CN112176806B (en) * 2020-10-16 2021-10-29 于胜泉 Stable road soft foundation treatment method and matched soft foundation treatment construction system

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