CN104775448A - Basement construction method in soft soil area - Google Patents
Basement construction method in soft soil area Download PDFInfo
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- CN104775448A CN104775448A CN201510173873.7A CN201510173873A CN104775448A CN 104775448 A CN104775448 A CN 104775448A CN 201510173873 A CN201510173873 A CN 201510173873A CN 104775448 A CN104775448 A CN 104775448A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/0007—Base structures; Cellars
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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Abstract
The invention discloses a basement construction method in a soft soil area. The basement construction method is characterized in that well point pipes adopt small-diameter steel pipes; the diameter of each steel pipe is 8cm to 10cm; the steel pipes are connected with the cathode of a power supply; when the depth of a basement is smaller than or equal to 6cm, a single row of well points is adopted; when the depth of the basement is greater than 6cm, double rows of well points are adopted; reinforcing steel bars of support piles are connected with the anode of the power supply; the distance between every two support piles is 1.4m to 1.6m; four to five anchor cables are arranged between every two support piles; the anchor cables are all connected by adopting a steel belt; the width of the steel belt is 250mm; the thickness of the steel belt is 20mm; anchoring is carried out by adopting an anchoring tool with four to five holes; the thickness of a steel base plate is 20mm; the length of the steel base plate is 200mm; the width of the steel base plate is 200mm.
Description
Technical field
The present invention relates to soft clay area basement construction method, be applicable to the realm of building construction.
Background technology
High-compressibility mud is thicker, and transmission coefficient is very little, general precipitation poor effect, and well-point pipe does not even have precipitation effect, and quality can not be guaranteed.Soldier pile reinforcing bar can be utilized as anode, and well-point pipe is as negative electrode, and under electric field action, positively charged pore water flows to well-point pipe, forces the water in mucky soil to flow into well-point pipe, then draws water from well-point pipe, groundwater table is declined gradually.Electronegative grogs anode moves, and the soil body around anode is encrypted, and can prevent clay particle from blocking the screen pack of well-point pipe, ensures well point normal pumping.For basement supporting, soldier pile and the prestress anchorage cable mode of combining can be obtained good effect.
Summary of the invention
The present invention is to provide a kind of soft clay area basement construction method, solves the problem of basement supporting construction prior art deficiency.
For this reason, well-point pipe adopts minor-diameter steel-tube, and diameter of steel tube is 8 ~ 10cm, and steel pipe is connected with power cathode.When the basement degree of depth is less than or equal to 6m, adopt single well point; When the basement degree of depth is greater than 6m, adopt double well point.Soldier pile reinforcing bar is connected with positive source, space length between supporting piles is 1.4m ~ 1.6m, 4 ~ 5 anchor cables are set between soldier pile, anchor cable all adopts steel band to connect, and width of steel band is 250mm, and thickness of strips is 20mm, adopt 4 ~ 5 hole ground tackle anchorings, billet thickness is 20mm, and billet length is 200mm, and billet width is 200mm.Anchor cable divides free segment and anchoring section, and according to a large amount of engineering practice, for mucky soil, freedom length is for being more than or equal to 6.5m and being less than 7m, and anchoring depth is more than or equal to 15m and is less than 16m; For silty clay, freedom length is for being more than or equal to 6m and being less than 6.5m, and anchoring depth is more than or equal to 14m and is less than 15m; For clay, freedom length is for being more than or equal to 5.5m and being less than 6m, and anchoring depth is more than or equal to 13m and is less than 14m; For sand, freedom length is for being more than or equal to 5m and being less than 5.5m, and anchoring depth is more than or equal to 12m and is less than 13m.
Construction sequence comprises:
(1) construction supporting stake
Soldier pile adopts mechanical type rotary drilling rig to rotate pore-forming, fills with high strength commercial concrete pile under water.Soldier pile construction sequence comprises:
1 the construction line-putting
Each axis stake pilot measurement 2 Survey control points, as the reference point that stake position repetition measurement is fixed a point and checked.Stake point adopts drill rod lime to be poured into underground 50cm and is fixed.
2 driller insertion
After mobile drill is in place, must guarantee that drilling rod is vertical; Should test running inspection be carried out before operation, to prevent midway, mechanical breakdown occur.After driller insertion, again check and approve stake position, can hole after acceptance(check).
3 pore-formings
Revolve and grab rig pore-forming, adopt rig from pulping retaining wall.Construct in the larger viscosity of viscosity, soft mud, steering resistance is large, and drilling efficiency is low, easily sticks with paste brill.Different soil selects different mud densities, and for clay, mud density selects 1.05g/cm
3, for sand, mud density selects 1.1 ~ 1.2g/cm
3, for ground, mud density selects 1.2 ~ 1.25g/cm
3, behind clear hole, mud density selects 1.03 ~ 1.1g/cm
3.
For clay, soil layer is generally softer, selects anti-friction drill pipe to creep into; For sand, the bonding capacity of sand is all poor, selects bucket tooth Straight spiral drill to dig drilling bucket and creeps into.For decomposed rock, tapered twist drill is adopted to creep into.For micro-decomposed rock or non-decomposed rock, adopt embedding rock cylinder to bore, embedding rock cylinder bores except cylindrical shell lower end is welded with sub warhead pick, cylinder inboard wall is equipped with the leaf of hinge of support core.
4 verify
After drilling depth meets design requirement, start gaging hole deeply, getting the average measured for 3 times is that the dark sediment thickness of final apertures should not be greater than 10cm, and sediment thickness at the bottom of hole, if do not met the demands, must proceed hole process clearly until meet the demands.
5 the making and fixing of reinforcing steel bar cages
Fabrication of reinforcing cage must carry out on platform mould.Must, in strict accordance with design and code requirement sectional making reinforcing cage, should prevent from during carrying reversing, bending before construction.When burying reinforcing cage underground, collision free hole wall.After reinforcing cage transfers to design attitude, should fix placed in the middle immediately.Reinforcing cage connects takes two-sided lap-welded mode.At reinforcing cage every 2m place setting position reinforced steel bar ring, guarantee protective layer thickness.
6 conduits are installed
Conduit adopts welded steel pipes to make, and often saves long 1m.Whether conduit answers control flange dish smooth with or without distortion before using, the slickness of pipe inner wall, the limit steel bar situation straightness accuracy of catheter holder supporting-point and sealing performance, and conduit adopts special tool to be mounted to 500 ~ 800mm at the bottom of distance hole.
7 filling concretes
Concrete is poured into conduit after meeting by concrete beginning quantity fast.After first batch of filling concrete is normal, successively should pour into, forbid midway to stop, concrete surface lifting height should be detected simultaneously, and ensure the buried depth of conduit.When conduit promotes, suspension centre answers vertical center, forbids tiltedly to drag conduit.Conduit dismounting needs fast, and the conduit pulled down should clean up immediately.In filling process, aperture adopts special measures, in case rising of steel cage, conduit will keep certain motion frequency, to make perfusion smooth and easy, improves pouring quality; Must test 2 points during measured hole inner concrete face height, symmetrical, getting minimum is concrete surface height.
8 Guan Liang constructions
After slope protection pile construction, 5cm place below excavator excavation inter-pile soil to stake top mark height, adopts the mode of Mechanical Crushing, human assistance finishing that pile crown concrete disintegrating is high to stake top mark.After abolishing slope protection pile pile crown laitance, carry out Guan Liang construction, carry out reinforcing bar binding and template erection on request, build Guan Liang.
(2) construction well-point pipe
Tiretube process is adopted to bury underground.By the sleeve pipe of diameter 150 ~ 200mm, after being sink to requiring the degree of depth with vibration punching, first at the bottom of hole, fill out one deck coarse gravel, then inserted between two parties by well-point pipe, between sleeve pipe and well-point pipe, coarse sand is inserted in layering, progressively extracts sleeve pipe, in case hole wall collapse.All well-point pipes, in the degree of depth of below ground 0.5 ~ 1.0m, tamp with clay, in case leak-stopping gas.
(3) drainage is set
With bent union, well-point pipe and water header are connected, water pump be installed and be communicated with water header, then fixing a drainpipe.
(4) anchor cable is installed
Before anchor cable hand-hole, through hole inspection is re-started to boring, must not owe dark.Before installing, reply anchor cable body carries out detailed inspection, checks anchor cable numbering and boring number, and repairs the accessory damaged and change.Firmly want uniformity when pushing anchor cable, prevent from damaging anchor cable accessory in propelling movement process.Anchor cable must not be made to rotate when pushing anchor cable, after anchor cable body is pushed to desired depth, inspection stack and Grouting Pipe whether unimpeded, otherwise anchor cable body should be extracted reinstall.
(5) waterglass
After anchor cable hand-hole, Anchoring part carries out pouring water glass, free segment pour water glass then anchorage cable stretching locking after carry out.When stretch-draw, the set strength of water glass must not lower than before 75% perfusion of design strength, reply water glass body carries out mobility and bleeding measures, water glass liquid viscosity requires not super 7s, 3h bleeding quantity must not surpass 2%, the Anchoring part of anchor cable adopts a waterglass single tension, pressure namely with 0.5MPa after stack overfall closes slurry, and closing the slurry time is 20min.
(6) secondary high-pressure waterglass
Anchor cable adopts secondary high-pressure waterglass, and after waterglass 3d first, carry out secondary high-pressure waterglass, waterglass is according to pressure and waterglass amount double control, and waterglass termination pressure is greater than 2MPa, and every root anchor cable secondary injection water glass amount is greater than 80kg.
(7) anchorage cable stretching locking
During construction when anchoring body intensity reaches 80% of design strength, prestressed stretch-draw can be carried out.Stretch-draw adopts and draws one every two; Before the formal stretch-draw of anchor pole, get 10% ~ 20% of design pulling force, and to the pre-stretch-draw of anchor pole 1 ~ 2 time.Anchor pole stretch-draw requires timing hierarchical loading, when prestressed tension rod is not obviously decayed, i.e. and lockable pull bar.When anchor cable compensate pulling and through be up to the standards locking after, can carry out free segment waterglass, waterglass emits underflow 1min to close slurry until locking place is altered, close slurry pressure be 0.5MPa, closing the slurry time is 15min.
In the present invention, soldier pile reinforcing bar and the interelectrode soil layer of well-point pipe two form electricity and enclose curtain, and underground water can be stoped to flow into from surrounding.The present invention utilizes soldier pile and anchor cable associated working to form braced structures, and saved inner support, cost is lower, and construction speed is very fast.
Detailed description of the invention
Certain engineering basement building area 12670m2, the basement degree of depth is 4.8m, and the total linear meter of supporting and protection structure is 460m, safe class secondary.Foundation ditch local environmental conditions is very complicated: east side next-door neighbour's national highway, sidewall of basement back gauge land red-line only 3m, has power supply overhead wire outside enclosure wall.Sidewall of basement back gauge diameter be the feed pipe of 300mm less than 4m, have soil pipe, rain pipe outside enclosure wall.North side near housing for survivor, sidewall of basement back gauge 6 layers of housing shortage 8m.Foundation ditch shape is trapezoidal, goes along with sb. to guard him arrangement difficulty larger.
Well-point pipe adopts minor-diameter steel-tube, and diameter of steel tube is 9cm, and steel pipe is connected with power cathode.Adopt single well point.Soldier pile reinforcing bar is connected with positive source, space length between supporting piles is 1.5m, 4 anchor cables are set between soldier pile, anchor cable all adopts steel band to connect, and width of steel band is 250mm, and thickness of strips is 20mm, adopt 4 hole ground tackle anchorings, billet thickness is 20mm, and billet length is 200mm, and billet width is 200mm.Anchor cable divides free segment and anchoring section, and free section of anchor cable length is 6.5m, and anchoring depth is 15m.
Construction sequence comprises:
(1) construction supporting stake
Soldier pile adopts mechanical type rotary drilling rig to rotate pore-forming, fills with high strength commercial concrete pile under water.Soldier pile construction sequence comprises:
1 the construction line-putting
Each axis stake pilot measurement 2 Survey control points, as the reference point that stake position repetition measurement is fixed a point and checked.Stake point adopts drill rod lime to be poured into underground 50cm and is fixed.
2 driller insertion
After mobile drill is in place, must guarantee that drilling rod is vertical; Should test running inspection be carried out before operation, to prevent midway, mechanical breakdown occur.After driller insertion, again check and approve stake position, can hole after acceptance(check).
3 pore-formings
Revolve and grab rig pore-forming, adopt rig from pulping retaining wall.Construct in the larger viscosity of viscosity, soft mud, steering resistance is large, and drilling efficiency is low, easily sticks with paste brill.Different soil selects different mud densities, and for clay, mud density selects 1.05g/cm
3, for sand, mud density selects 1.1 ~ 1.2g/cm
3.Anti-friction drill pipe is selected to creep into.
4 verify
After drilling depth meets design requirement, start gaging hole deeply, getting the average measured for 3 times is that the dark sediment thickness of final apertures should not be greater than 10cm, and sediment thickness at the bottom of hole, if do not met the demands, must proceed hole process clearly until meet the demands.
5 the making and fixing of reinforcing steel bar cages
Fabrication of reinforcing cage must carry out on platform mould.Must, in strict accordance with design and code requirement sectional making reinforcing cage, should prevent from during carrying reversing, bending before construction.When burying reinforcing cage underground, collision free hole wall.After reinforcing cage transfers to design attitude, should fix placed in the middle immediately.Reinforcing cage connects takes two-sided lap-welded mode.At reinforcing cage every 2m place setting position reinforced steel bar ring, guarantee protective layer thickness.
6 conduits are installed
Conduit adopts welded steel pipes to make, and often saves long 1m.Whether conduit answers control flange dish smooth with or without distortion before using, the slickness of pipe inner wall, the limit steel bar situation straightness accuracy of catheter holder supporting-point and sealing performance, and conduit adopts special tool to be mounted to 500 ~ 800mm at the bottom of distance hole.
7 filling concretes
Concrete is poured into conduit after meeting by concrete beginning quantity fast.After first batch of filling concrete is normal, successively should pour into, forbid midway to stop, concrete surface lifting height should be detected simultaneously, and ensure the buried depth of conduit.When conduit promotes, suspension centre answers vertical center, forbids tiltedly to drag conduit.Conduit dismounting needs fast, and the conduit pulled down should clean up immediately.In filling process, aperture adopts special measures, in case rising of steel cage, conduit will keep certain motion frequency, to make perfusion smooth and easy, improves pouring quality; Must test 2 points during measured hole inner concrete face height, symmetrical, getting minimum is concrete surface height.
8 Guan Liang constructions
After slope protection pile construction, 5cm place below excavator excavation inter-pile soil to stake top mark height, adopts the mode of Mechanical Crushing, human assistance finishing that pile crown concrete disintegrating is high to stake top mark.After abolishing slope protection pile pile crown laitance, carry out Guan Liang construction, carry out reinforcing bar binding and template erection on request, build Guan Liang.
(2) construction well-point pipe
Tiretube process is adopted to bury underground.By the sleeve pipe of diameter 120 ~ 150mm, after being sink to requiring the degree of depth with vibration punching, first at the bottom of hole, fill out one deck coarse gravel, then inserted between two parties by well-point pipe, between sleeve pipe and well-point pipe, coarse sand is inserted in layering, progressively extracts sleeve pipe, in case hole wall collapse.All well-point pipes, in the degree of depth of below ground 0.5 ~ 1.0m, tamp with clay, in case leak-stopping gas.
(3) drainage is set
With bent union, well-point pipe and water header are connected, water pump be installed and be communicated with water header, then fixing a drainpipe.
(4) anchor cable is installed
Before anchor cable hand-hole, through hole inspection is re-started to boring, must not owe dark.Before installing, reply anchor cable body carries out detailed inspection, checks anchor cable numbering and boring number, and repairs the accessory damaged and change.Firmly want uniformity when pushing anchor cable, prevent from damaging anchor cable accessory in propelling movement process.Anchor cable must not be made to rotate when pushing anchor cable, after anchor cable body is pushed to desired depth, inspection stack and Grouting Pipe whether unimpeded, otherwise anchor cable body should be extracted reinstall.Concrete steps comprise:
(5) waterglass
After anchor cable hand-hole, Anchoring part carries out pouring water glass, free segment pour water glass then anchorage cable stretching locking after carry out.When stretch-draw, the set strength of water glass must not lower than before 75% perfusion of design strength, reply water glass body carries out mobility and bleeding measures, water glass liquid viscosity requires not super 7s, 3h bleeding quantity must not surpass 2%, the Anchoring part of anchor cable adopts a waterglass single tension, pressure namely with 0.5MPa after stack overfall closes slurry, and closing the slurry time is 20min.
(6) secondary high-pressure waterglass
Anchor cable adopts secondary high-pressure waterglass, and after waterglass 3d first, carry out secondary high-pressure waterglass, waterglass is according to pressure and waterglass amount double control, and waterglass termination pressure is greater than 2MPa, and every root anchor cable secondary injection water glass amount is greater than 80kg.
(7) anchorage cable stretching locking
During construction when anchoring body intensity reaches 80% of design strength, prestressed stretch-draw can be carried out.Stretch-draw adopts and draws one every two; Before the formal stretch-draw of anchor pole, get 10% ~ 20% of design pulling force, and to the pre-stretch-draw of anchor pole 1 ~ 2 time.Anchor pole stretch-draw requires timing hierarchical loading, when prestressed tension rod is not obviously decayed, i.e. and lockable pull bar.When anchor cable compensate pulling and through be up to the standards locking after, can carry out free segment waterglass, waterglass emits underflow 1min to close slurry until locking place is altered, close slurry pressure be 0.5MPa, closing the slurry time is 15min.
Synchronously monitor during basement construction, from soil mass displacement at the deep layer monitoring situation, deviational survey Kongzui big displacement quantity is all less than 60mm, and illustrate that soil mass displacement at the deep layer is little, soil stabilization outside space enclosing structure, space enclosing structure is safe and reliable.From foundation ditch top and surrounding building horizontal displacement monitoring situation, horizontal displacement monitoring point is all less than 50mm, and illustrate that space enclosing structure distortion is less, work progress is safe and reliable.The distortion of this Deep Foundation Pit is little, and it is less cheat outer land movement sedimentation, and space enclosing structure bulk settling amount not quite, does not affect the normal operation of support system, and excavation of foundation pit is not to surrounding enviroment generation significant impact.
Claims (6)
1. a soft clay area basement construction method, it is characterized in that well-point pipe adopts minor-diameter steel-tube, diameter of steel tube is 8 ~ 10cm, and steel pipe is connected with power cathode; When the basement degree of depth is less than or equal to 6m, adopt single well point; When the basement degree of depth is greater than 6m, adopt double well point; Soldier pile reinforcing bar is connected with positive source, space length between supporting piles is 1.4m ~ 1.6m, 4 ~ 5 anchor cables are set between soldier pile, anchor cable all adopts steel band to connect, and width of steel band is 250mm, and thickness of strips is 20mm, adopt 4 ~ 5 hole ground tackle anchorings, billet thickness is 20mm, and billet length is 200mm, and billet width is 200mm.
2. soft clay area according to claim 1 basement construction method, is characterized in that construction sequence comprises:
(1) construction supporting stake
Soldier pile adopts mechanical type rotary drilling rig to rotate pore-forming, fills with high strength commercial concrete pile under water; Soldier pile construction sequence comprises:
1 the construction line-putting
Each axis stake pilot measurement 2 Survey control points, as the reference point that stake position repetition measurement is fixed a point and checked; Stake point adopts drill rod lime to be poured into underground 50cm and is fixed;
2 driller insertion
After mobile drill is in place, must guarantee that drilling rod is vertical; Should test running inspection be carried out before operation, to prevent midway, mechanical breakdown occur; After driller insertion, again check and approve stake position, can hole after acceptance(check);
3 pore-formings
Revolve and grab rig pore-forming, adopt rig from pulping retaining wall;
4 verify
After drilling depth meets design requirement, start gaging hole deeply, getting the average measured for 3 times is that the dark sediment thickness of final apertures should not be greater than 10cm, and sediment thickness at the bottom of hole, if do not met the demands, must proceed hole process clearly until meet the demands;
5 the making and fixing of reinforcing steel bar cages
Fabrication of reinforcing cage must carry out on platform mould; Must, in strict accordance with design and code requirement sectional making reinforcing cage, should prevent from during carrying reversing, bending before construction; When burying reinforcing cage underground, collision free hole wall; After reinforcing cage transfers to design attitude, should fix placed in the middle immediately; Reinforcing cage connects takes two-sided lap-welded mode; At reinforcing cage every 2m place setting position reinforced steel bar ring, guarantee protective layer thickness;
6 conduits are installed
Conduit adopts welded steel pipes to make, and often saves long 1m; Whether conduit answers control flange dish smooth with or without distortion before using, the slickness of pipe inner wall, the limit steel bar situation straightness accuracy of catheter holder supporting-point and sealing performance, and conduit adopts special tool to be mounted to 500 ~ 800mm at the bottom of distance hole;
7 filling concretes
Concrete is poured into conduit after meeting by concrete beginning quantity fast; After first batch of filling concrete is normal, successively should pour into, forbid midway to stop, concrete surface lifting height should be detected simultaneously, and ensure the buried depth of conduit; When conduit promotes, suspension centre answers vertical center, forbids tiltedly to drag conduit; Conduit dismounting needs fast, and the conduit pulled down should clean up immediately; In filling process, aperture adopts special measures, in case rising of steel cage, conduit will keep certain motion frequency, to make perfusion smooth and easy, improves pouring quality; Must test 2 points during measured hole inner concrete face height, symmetrical, getting minimum is concrete surface height;
8 Guan Liang constructions
After slope protection pile construction, 5cm place below excavator excavation inter-pile soil to stake top mark height, adopts the mode of Mechanical Crushing, human assistance finishing that pile crown concrete disintegrating is high to stake top mark; After abolishing slope protection pile pile crown laitance, carry out Guan Liang construction, carry out reinforcing bar binding and template erection on request, build Guan Liang;
(2) construction well-point pipe
All well-point pipes, in the degree of depth of below ground 0.5 ~ 1.0m, tamp with clay, in case leak-stopping gas;
(3) drainage is set
With bent union, well-point pipe and water header are connected, water pump be installed and be communicated with water header, then fixing a drainpipe;
(4) anchor cable is installed
Before anchor cable hand-hole, through hole inspection is re-started to boring, must not owe dark; Before installing, reply anchor cable body carries out detailed inspection, checks anchor cable numbering and boring number, and repairs the accessory damaged and change; Firmly want uniformity when pushing anchor cable, prevent from damaging anchor cable accessory in propelling movement process; Anchor cable must not be made to rotate when pushing anchor cable, after anchor cable body is pushed to desired depth, inspection stack and Grouting Pipe whether unimpeded, otherwise anchor cable body should be extracted reinstall;
(5) waterglass
After anchor cable hand-hole, Anchoring part carries out pouring water glass, free segment pour water glass then anchorage cable stretching locking after carry out; When stretch-draw, the set strength of water glass must not lower than before 75% perfusion of design strength, reply water glass body carries out mobility and bleeding measures, the not super 7s of water glass liquid viscosity, 3h bleeding quantity does not surpass 2%, the Anchoring part of anchor cable adopts a waterglass single tension, pressure namely with 0.5MPa after stack overfall closes slurry, and closing the slurry time is 20min;
(6) secondary high-pressure waterglass
Anchor cable adopts secondary high-pressure waterglass, and after waterglass 3d first, carry out secondary high-pressure waterglass, waterglass is according to pressure and waterglass amount double control, and waterglass termination pressure is greater than 2MPa, and every root anchor cable secondary injection water glass amount is greater than 80kg;
(7) anchorage cable stretching locking
During construction when anchoring body intensity reaches 80% of design strength, prestressed stretch-draw can be carried out; Stretch-draw adopts and draws one every two; Before the formal stretch-draw of anchor pole, get 10% ~ 20% of design pulling force, and to the pre-stretch-draw of anchor pole 1 ~ 2 time; Anchor pole stretch-draw requires timing hierarchical loading, when prestressed tension rod is not obviously decayed, i.e. and lockable pull bar; When anchor cable compensate pulling and through be up to the standards locking after, can carry out free segment waterglass, waterglass emits underflow 1min to close slurry until locking place is altered, close slurry pressure be 0.5MPa, closing the slurry time is 15min.
3. soft clay area according to claim 1 basement construction method, anchor cable divides free segment and anchoring section, and for mucky soil, freedom length is for being more than or equal to 6.5m and being less than 7m, and anchoring depth is more than or equal to 15m and is less than 16m; For silty clay, freedom length is for being more than or equal to 6m and being less than 6.5m, and anchoring depth is more than or equal to 14m and is less than 15m; For clay, freedom length is for being more than or equal to 5.5m and being less than 6m, and anchoring depth is more than or equal to 13m and is less than 14m; For sand, freedom length is for being more than or equal to 5m and being less than 5.5m, and anchoring depth is more than or equal to 12m and is less than 13m.
4. soft clay area according to claim 1 basement construction method, is characterized in that: revolve different soil when grabbing rig pore-forming and select different mud densities, for clay, mud density selects 1.05g/cm
3, for sand, mud density selects 1.1 ~ 1.2g/cm
3, for ground, mud density selects 1.2 ~ 1.25g/cm
3, behind clear hole, mud density selects 1.03 ~ 1.1g/cm
3.
5. soft clay area according to claim 1 basement construction method, is characterized in that: to revolve when grabbing rig pore-forming for clay, select anti-friction drill pipe to creep into; For sand, select bucket tooth Straight spiral drill to dig drilling bucket and creep into; For decomposed rock, tapered twist drill is adopted to creep into; For micro-decomposed rock or non-decomposed rock, adopt embedding rock cylinder to bore, embedding rock cylinder bores except cylindrical shell lower end is welded with sub warhead pick, cylinder inboard wall is equipped with the leaf of hinge of support core.
6. soft clay area according to claim 1 basement construction method, it is characterized in that: construction well-point pipe step is as follows: by the sleeve pipe of diameter 150 ~ 200mm, after being sink to requiring the degree of depth with vibration punching, first at the bottom of hole, fill out one deck coarse gravel, again well-point pipe is inserted between two parties, between sleeve pipe and well-point pipe, coarse sand is inserted in layering, progressively extracts sleeve pipe, in case hole wall collapse.
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| CN201510173873.7A CN104775448A (en) | 2015-03-30 | 2015-03-30 | Basement construction method in soft soil area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201528A (en) * | 2015-09-21 | 2015-12-30 | 中国矿业大学 | Silica sol slow infiltration reinforcing method of argillaceous soft rock |
| CN114837206A (en) * | 2022-05-07 | 2022-08-02 | 广西欣港交通投资有限公司 | Active waterproof system of suspension bridge anchorage foundation enclosing structure and construction method |
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| CN101871210A (en) * | 2009-04-23 | 2010-10-27 | 中国二十冶建设有限公司 | Electro-osmotic drainage method in construction of large-area deep foundation pit in sludge region with high water ratio |
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|---|---|---|---|---|
| CN105201528A (en) * | 2015-09-21 | 2015-12-30 | 中国矿业大学 | Silica sol slow infiltration reinforcing method of argillaceous soft rock |
| CN114837206A (en) * | 2022-05-07 | 2022-08-02 | 广西欣港交通投资有限公司 | Active waterproof system of suspension bridge anchorage foundation enclosing structure and construction method |
| CN114837206B (en) * | 2022-05-07 | 2024-02-06 | 广西欣港交通投资有限公司 | Active waterproof system for anchorage foundation enclosure structure of suspension bridge and construction method |
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