CN102635120A - Supportless construction structure and supportless construction method for round deep base pit - Google Patents
Supportless construction structure and supportless construction method for round deep base pit Download PDFInfo
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- CN102635120A CN102635120A CN2012101345626A CN201210134562A CN102635120A CN 102635120 A CN102635120 A CN 102635120A CN 2012101345626 A CN2012101345626 A CN 2012101345626A CN 201210134562 A CN201210134562 A CN 201210134562A CN 102635120 A CN102635120 A CN 102635120A
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Abstract
The invention discloses a supportless construction structure and a supportless construction method for a round deep base pit. The supportless construction method comprises the steps as follows: carrying out three-shaft stirring pile construction, cast-in-situ bored pile construction, earth mass grouting reinforcement, earth excavation, first enclosing purlin construction, subsequent earth excavation, next enclosing purlin construction, subsequent earth excavation and cushion layer and bottom plate construction so as to obtain a deep base pit bracing structure mainly comprising a circle of three-shaft stirring pile, a circle of cast-in-situ bored pile and a plurality of enclosing purlins. The bracing structure has no supporting structure; the arch effect of the earth mass is utilized; the earth pressure on the bracing structure is reduced; the external load is converted into the internal pressure on the enclosing purlins by the arch effect of the enclosing purlins at the same time; the characteristic of good pressure resistance of concrete is brought into full play; and as no supports are provided, the processes of dismounting and replacing the supports are removed, so that the maintenance expense of the base pit is reduced and the construction speed is quick.
Description
Technical field
The invention belongs to the realm of building construction, specifically relate to a kind of constructing structure and job practices of circular deep foundation ditch.
Background technology
Along with the rapid development of China's economic and the quickening of urbanization process, land resources is more and more nervous, in order to make full use of land resources; Alleviate the urban land difficulty, building has become certainty to high-altitude and underground development, in the development and use process of the underground space; Deep-foundation pit engineering becomes inevitable problem; Foundation ditch is the important component part of highrise building and large-scale municipal engineering, and in the transformation of mature city, base pit engineering often concentrates on the area, down town.Base pit engineering is large-scale soil excavation engineering, and its most direct consequence is the heavily distribution that causes the surrounding soil ess-strain, causes moving of stratum on every side, produces bigger ground settlement and differential settlement, and is unfavorable to the surrounding buildings environment.Gently then produce building tear, cause user's inconvenience, heavy then the phenomenon of line fracture, house collapse occurs, cause the massive losses of human and material resources, financial resources.Base pit engineering now develops towards " dark, difficult, danger, big " direction day by day, and is also serious day by day to the influence of environment.How to guarantee that foundation ditch ontological security and the protection that reduces surrounding enviroment have become the difficult problem that China's engineering interface faces.
Generally take agitation pile sealing, castinplace pile retaining soil for deep foundation ditch at present, the job practices of support in adding again perhaps adopts diaphragm wall to keep off native sealing and adds the job practices that interior support is supported again.Because the above-mentioned job practices that generally adopts has all been used interior support, and interior support can influence shoveling speed in the foundation ditch, and need change support and tear support open, cause that speed of application is slow, the wasting of resources, thereby cause cost high.
Summary of the invention
In order to overcome above-mentioned defective; The invention provides a kind of circular deep foundation ditch and do not have the constructing structure of support and job practices; This circular deep foundation ditch does not have the constructing structure of support and job practices has been saved support and changed support; Make that the bracing of foundation pit expense reduces, speed of application is accelerated, utilized the arch effect of the soil body, reduced the soil pressure that acts on the space enclosing structure; Simultaneously also having utilized the arch effect of enclosing purlin that external loads is converted into acts on the internal pressure of enclosing purlin, has given full play to the good characteristics of concrete compressive property.
The present invention for the technical scheme that solves its technical problem and adopt is:
A kind of circular deep foundation ditch does not have the support constructing structure; Be provided with three agitation piles of a circle, a circle bored pile and some roads and enclose purlin; Some said three agitation piles surround a circle and a continuous circle; Some said bored piles surround circle and have a circle at interval, and three agitation piles of a said circle are positioned at the periphery of a said circle bored pile, and per pass is said to enclose the annular that purlin all is the one-time-concreting moulding; It is Guan Liang that first road encloses purlin; Said Guan Liang is cast in the stake top of a said circle bored pile and the main muscle epimere of bored pile places in the hat beam, and all the other enclose purlin and all are cast on the inner ring side of a said circle bored pile and with bored pile and are fixedly connected, and there is spacing in the adjacent purlin in the vertical direction that encloses.
Except that Guan Liang all the other are enclosed purlin and all are provided with some muscle that hang, and saidly hang the main muscle that muscle is welded in said bored pile.
A kind of circular deep foundation ditch support free construction method comprises the steps:
One, three mixing pile constructions: set up three circular and continuous agitation piles of a corral;
Two, bored pile construction: within three agitation piles of a said circle, set up the circular and bored pile at interval of a corral;
Three, the soil body between three agitation piles and the bored pile adopts grouting and reinforcing;
Four, the top layer earthwork is excavated; Carry out first road then and enclose purlin construction and maintenance to design strength; It is Guan Liang that said first road encloses purlin; Said Guan Liang is cast in the stake top of a said circle bored pile and the main muscle of bored pile places in the hat beam, guarantee that the hat beam one-time-concreting of annular is accomplished;
Five, continue earth excavation; Dig and enclose purlin absolute altitude position to second road; Carry out second road then and enclose purlin construction and maintenance to design strength; Said second road encloses purlin and is cast on the inner ring side of a said circle bored pile and is fixedly connected with bored pile, guarantee that second road of annular encloses the completion of purlin one-time-concreting;
Six, continue earth excavation; Dig and enclose purlin absolute altitude position to the 3rd road; Carry out the 3rd road then and enclose purlin construction and maintenance to design strength; Said the 3rd road encloses purlin and is cast on the inner ring side of a said circle bored pile and is fixedly connected with bored pile, guarantee that the 3rd road of annular encloses the completion of purlin one-time-concreting;
Seven, continue earth excavation; Dig and enclose purlin absolute altitude position to the n road; Carry out the n road then and enclose purlin construction and maintenance to design strength; Said n encloses in the road purlin and is cast on the inner ring side of a said circle bored pile and is fixedly connected with bored pile, guarantee that the n road of annular encloses the completion of purlin one-time-concreting;
Eight, continue earth excavation, dig end absolute altitude, carry out the construction of bed course and base plate then to the hole.
Three agitation piles adopt one-sided fashion of extrusion or the jumping mode of beating to construct in said step 1.
Before carrying out said step 1, carry out levelling of the land earlier and measure unwrapping wire.
The mode of earth excavation is in the said step 5: the car ramp lead in the hole is set, takes on one side from beginning, the mode of excavation while moving back closes up in car ramp and boundary, foundation ditch edge at last.
The mode of earth excavation is in the said step 6: with digging machine the earthwork is transported in the foundation ditch near car ramp one side, long-armed digging machine rests in the ground on foundation ditch limit and near ramp one side-draw soil and be placed on cubic metre of earth car and transport outward.
The mode of earth excavation is in said step 7 and the step 8: adopt the central island digging mode, with digging machine the earthwork is piled in the middle of the foundation ditch, with tower crane the earthwork is winched to a cubic metre of earth car outward transport.
Except that Guan Liang all the other are enclosed purlin and all when building, are established some muscle that hang, and will hang the main muscle that muscle is welded in bored pile.
Complete job practices is to be undertaken by following step:
One, levelling of the land: before three mixer constructions, must carry out levelling of the land earlier, remove the hard thing in top layer and the underground obstacle of construction area;
Two, measure unwrapping wire:
A. the measuring point that provides according to Construction unit is a reference point, arranges in-site measurement control point and absolute altitude control point;
B. Surveying Control Point is arranged in the center of circle on foundation pit enclosure structure plane;
C. each three agitation pile, each root bored pile are all carried out the position measuring by stake;
D. three agitation piles are put central axis, and again by the circle fluting, measuring axis pore is control stake position then;
Three, three mixing pile constructions:
A. according to three agitation pile unwrapping wire location, adopt digging machine excavation guide groove, guide groove dimensional requirement center line both sides are wide each 0.5～0.7 meter, dark 1.0～1.5 meters;
B., location shaped steel is set: place two location shaped steel down in the vertical guide slot direction; On the parallel guide slots direction is placed two, locate shaped steel, select, on the shaped steel of last location, make mark according to stake machine size; Marking path is directly selected according to stake, so that look for the stake position in the construction;
C. pile-forming machine perching: should be according to circular feature, every three stakes adjustment stride trend notices that simultaneously cover beats overlap joint, and the gantry upright post verticality will be guaranteed verticality≤0.004 of a machine, positions after a machine is located again and checks, and deviate is less than 5cm;
D. cement paste preparation: water/binder ratio is 1.5～2.0, and cement adopts the above portland cement of P.O42.5, and cement mixed weight is to be stirred 15%～23% of soil mass consolidation quality;
E. creep into and stir whitewashing: starter motor, the stake machine stirs, and subsidence velocity is 0.5m/min～1.0m/min when whitewashing is crept in sinking, and the whitewashing amount is controlled at 50%～70% of total whitewashing amount, divides in the stake bottom suitably to continue to stir whitewashing;
F. promote and stir whitewashing: hoisting velocity is 1.0m/min～2.0m/min when promoting the stirring whitewashing, and the whitewashing amount is controlled at 30%～50% of total whitewashing amount;
G. the displacement of stake machine is also in place, takes one-sided fashion of extrusion or the jumping mode of beating to construct, and makes three agitation piles surround a circular circle and continuous;
Four, bored pile construction:
A. according to the control point bored pile is carried out the position measuring by root;
B. casing is buried underground: with stake position central point is the center of circle, digs out the round pool than the big 250mm～350mm in design stake footpath, and the casing vertical fixing is proofreaied and correct in place, stake position, tamps with clay around reaching after the requirement, guarantees to stablize, and carries out record and carry out repetition measurement;
C. rig installation in position: rig is installed must level, straight and firm, guarantees that simultaneously drilling rod, rotating disk and casing center are on same plumb line;
D. slurrying: mud property requires like following table:
| Project | Proportion | Viscosity (S) |
| Inject aperture mud | ≤1.15 | ?18～22 |
| Delivery port mud | ≤1.3 | ?20～26 |
E. drilling and forming hole: according to a design stake type; Select rig for use, carry out the drilling and forming hole construction, bit diameter should equal the intended diameter of stake; Drill bit taper angle should be greater than 120 °; To often veritify bit size in the construction, find in time to repair or to change when wearing and tearing are not up to standard, guarantee that expanded diameter meets design requirement;
F. once clear hole: creep into to projected depth, drilling tool is lifted from 0.15m～0.25m at the bottom of the hole, up and down reciprocatingly go up and down and the low speed revolution, and full pump amount punching, abundant larger particles soil block at the bottom of the grinding hole treats that the hole internal return goes out in the slurries no clod and can be considered once clearly that the hole finishes;
G. downcomer;
H. the clear hole of secondary;
I. concreting forms a circle bored pile that surrounds circle and interval and is positioned at said one and encloses within three agitation piles;
Five, the soil body adopts grouting and reinforcing between three agitation piles and the bored pile;
Six, top layer soil excavation; Carry out first road and enclose purlin construction and maintenance to design strength; It is that the main muscle epimere of Guan Liang and stake top that is cast in a said circle bored pile and bored pile places in the hat beam that said first road encloses purlin, guarantee that the hat beam one-time-concreting of annular is accomplished;
Seven, first road encloses purlin absolute altitude to the second road and encloses purlin absolute altitude position soil excavation: the car ramp lead in the hole is set, takes on one side from beginning, the mode of excavation while moving back closes up in car ramp and boundary, foundation ditch edge at last;
Eight, second road encloses purlin construction: carry out second road and enclose purlin construction and maintenance to design strength; Second road that guarantees annular enclose purlin and each following road thereof enclose purlin all one-time-concreting accomplish; Said second road encloses purlin and each following road thereof and encloses purlin and all be cast on the inner ring side of a said circle bored pile; And said second road encloses purlin and each following road thereof and encloses purlin and all when building, establish some muscle and joint bars of hanging, and will hang the main muscle that muscle and joint bar are welded in bored pile;
Nine, second road encloses purlin absolute altitude to the three roads and encloses purlin absolute altitude position soil excavation: with digging machine the earthwork is transported in the foundation ditch near car ramp one side, the ground that long-armed digging machine rests in the foundation ditch limit is near ramp one side-draw soil and be placed on cubic metre of earth car and transport outward;
Ten, the 3rd road encloses purlin construction: carry out the 3rd road and enclose purlin construction and maintenance to design strength;
The 11, the 3rd road encloses purlin absolute altitude to the four roads and encloses purlin absolute altitude position soil excavation: adopt the central island digging mode, with digging machine the earthwork is piled in the middle of the foundation ditch, with tower crane the earthwork is winched to a cubic metre of earth car outward transport;
The 12, the 4th road encloses purlin construction: enclose in the 3rd road and the 4th road between the purlin in the central island earthwork outward transport, carry out the 4th road and enclose purlin construction and maintenance to design strength;
13, repeating step 11 and step 12;
14, the n road encloses the purlin absolute altitude to cheating absolute altitude position, end soil excavation: adopt the central island digging mode, with digging machine the earthwork is piled in the middle of the foundation ditch, with tower crane the earthwork is winched to a cubic metre of earth car outward transport;
15, carry out the construction of bed course and base plate;
16, carry out main body construction.
The invention has the beneficial effects as follows: circular deep foundation ditch of the present invention does not have the support constructing structure and job practices has been saved braced structures and torn the process of changing support that supports open; Make that the bracing of foundation pit expense reduces, speed of application is accelerated; And utilized the arch effect of the soil body; Reduced the soil pressure that acts on the space enclosing structure, also utilized the arch effect of enclosing purlin that external loads is converted into simultaneously and acted on the internal pressure of enclosing purlin, given full play to the good characteristics of concrete compressive property.
Description of drawings
Fig. 1 is a plan view of the present invention;
Fig. 2 is a sectional view of the present invention;
Fig. 3 for of the present invention enclose the purlin place hang muscle and joint bar sketch map.
The specific embodiment
Embodiment 1: a kind of circular deep foundation ditch does not have the support constructing structure; Be provided with three agitation piles of a circle 1, a circle bored pile 2 and some roads and enclose purlin 3; Some said three agitation piles surround a circle and a continuous circle; Some said bored piles surround circle and have a circle at interval, and three agitation piles of a said circle are positioned at the periphery of a said circle bored pile, and per pass is said to enclose the annular that purlin all is the one-time-concreting moulding; It is Guan Liang that first road encloses purlin; Said Guan Liang is cast in the stake top of a said circle bored pile and the main muscle of bored pile will place in the hat beam, and all the other enclose purlin and all are cast on the inner ring side of a said circle bored pile and with bored pile and are fixedly connected, and there is spacing in the adjacent purlin in the vertical direction that encloses.
Except that Guan Liang all the other are enclosed purlin and all are provided with some muscle 4 and joint bars 5 of hanging, and saidly hang the main muscle 21 that muscle and joint bar are welded in said bored pile 2.
Embodiment 2: a kind of circular deep foundation ditch support free construction method, carry out according to the following steps:
(1) levelling of the land: before three mixer constructions, must carry out levelling of the land earlier, remove the hard thing in top layer and the underground obstacle of construction area, can adopt the pading plate method to be convenient to the pile frame walking in order to strengthen the load-bearing load;
(2) measure unwrapping wire:
A. the measuring point that provides according to Construction unit is a reference point, arranges in-site measurement control point and absolute altitude control point;
B. Surveying Control Point is arranged in the center of circle on foundation pit enclosure structure plane;
C. each three agitation pile, each root bored pile are all carried out the position measuring by stake;
D. three agitation piles are put central axis, and by the circle fluting, measuring axis pore is control stake position then;
(3) three mixing pile constructions
A. according to three agitation pile unwrapping wire location, adopt digging machine excavation guide groove, guide groove dimensional requirement center line both sides are wide each 0.5～0.7 meter, dark 1.0～1.5 meters;
B., location shaped steel is set: the vertical guide slot direction is placed two location shaped steel down, and specification is H200mm * 200mm, is about 2.5m; On the parallel guide slots direction is placed two, locate shaped steel, specification H300mm * 300mm, H350mm * 350mm or H400mm * 400mm are about 8～20m; Select according to stake machine size, on the shaped steel of last location, make mark, marking path is directly selected according to stake, so that look for the stake position in the construction.
C. pile-forming machine perching: should be according to circular feature, every three stakes adjustment stride trend notices that simultaneously cover beats overlap joint, accomplishes to stablize, straight and even.The gantry upright post verticality will be guaranteed verticality≤1/250 of a machine.Position behind the stake machine location again and check, deviate is less than 5cm.
D. cement paste preparation: water/binder ratio is 1.5～2.0 generally speaking, and cement adopts the above Portland cement of P.O42.5, and cement mixed weight is to be stirred 15～23% of soil mass consolidation quality;
E. creep into and stir whitewashing: starter motor, the stake machine stirs, and subsidence velocity is 0.5m/min～1.0m/min when whitewashing is crept in sinking, and the whitewashing amount is controlled at about 60% of total whitewashing amount, divides in the stake bottom suitably to continue to stir whitewashing.
F. promote and stir whitewashing: hoisting velocity is 1.0m/min～2.0m/min when promoting the stirring whitewashing, and the whitewashing amount is controlled at about 40% of total whitewashing amount;
G. the displacement of stake machine is also in place, takes one-sided fashion of extrusion or the jumping mode of beating to construct, and makes three agitation piles surround a circular circle and continuous;
(4) bored pile construction
A. according to the control point bored pile is carried out the position measuring by root;
B. casing is buried underground: with stake position central point is the center of circle, digs out than the round pool about the big 300mm in design stake footpath, and the casing vertical fixing is proofreaied and correct in place, stake position, tamps with clay around reaching after the requirement, guarantees to stablize, and carries out record and carry out repetition measurement;
C. rig installation in position: rig is installed must level, straight, firm, guarantees that simultaneously drilling rod, rotating disk, casing center on same plumb line, accomplish sight alignment;
D. slurrying: mud property requires like following table:
| Project | Proportion | Viscosity (S) |
| Inject aperture mud | ≤1.15 | 18～22 |
| Delivery port mud | ≤1.3 | 20～26 |
E. drilling and forming hole: according to a design stake type; Select rig for use, carry out the drilling and forming hole construction, bit diameter should equal the intended diameter of stake; Drill bit taper angle should be greater than 120 °; Will often veritify bit size in the construction, the discovery wearing and tearing are excessive should in time be repaired, change, and guarantees that expanded diameter meets design requirement.
F. once clear hole: creep into to projected depth, drilling tool is lifted from the bottom of the hole about 0.2m, up and down reciprocatingly go up and down, the low speed revolution, full pump amount punching, abundant larger particles soil block at the bottom of the grinding hole treats that the hole internal return goes out in the slurries no clod and can be considered once clearly that the hole finishes;
G. downcomer;
H. the clear hole of secondary;
I. concreting forms a circle bored pile that surrounds circle and interval and is positioned at said one and encloses within three agitation piles;
The soil body adopts grouting and reinforcing between (5) three agitation piles and bored pile;
(6) shallow-layer (top layer) soil excavation; Carry out first road and enclose purlin (Guan Liang) construction and maintenance to design strength; Said Guan Liang builds in the main muscle epimere of the stake top of a said circle bored pile and bored pile and will insert in the hat beam; First road that guarantees annular encloses the completion of purlin one-time-concreting, must not build several times;
(7) first roads enclose purlin absolute altitude to the second road and enclose purlin absolute altitude position soil excavation: the car ramp that leads in the hole can be set, take from beginning on one side, the mode of excavation while moving back closes up in car ramp and boundary, foundation ditch edge at last;
(8) second roads enclose purlin construction: carry out second road and enclose purlin construction and maintenance to design strength; Second road that guarantees annular enclose purlin and each following road thereof enclose purlin all one-time-concreting accomplish; Said second road encloses purlin and each following road thereof and encloses purlin and all build on the inner ring side of a said circle bored pile; And said second road encloses purlin and each following road thereof and encloses purlin and all when building, establish and somely hang muscle 4 and joint bar 5, and will hang the main muscle 21 that muscle and joint bar are welded in bored pile, and is as shown in Figure 3;
(9) second roads enclose purlin absolute altitude to the three roads and enclose purlin absolute altitude position soil excavation: with small-sized digging machine the earthwork is transported in the foundation ditch near earthwork outward transport car ramp one side, long-armed digging machine rests in foundation ditch limit, ground near ramp one side-draw soil and be placed on cubic metre of earth car and transport outward;
(10) the 3rd roads enclose purlin construction: carry out the 3rd road and enclose purlin construction and maintenance to design strength, guarantee that annular encloses the purlin one-time-concreting and accomplishes, must not build several times;
(11) the 3rd roads enclose purlin absolute altitude to the four roads and enclose purlin absolute altitude position soil excavation: adopt the central island digging mode, with small-sized digging machine the earthwork is piled in the middle of the foundation ditch, with tower crane the earthwork is winched to cubic metre of earth car and transport outward;
(12) the 4th roads enclose purlin construction: enclose in the 3rd road and the 4th road between the purlin in the central island earthwork outward transport, carry out the 4th road and enclose purlin construction and maintenance to design strength, guarantee that annular encloses the purlin one-time-concreting and accomplishes, must not build several times;
(13) repeat (11) and (12);
(14) n roads enclose the purlin absolute altitude to cheating absolute altitude position, end soil excavation: adopt the central island digging mode, with small-sized digging machine the earthwork is piled in the middle of the foundation ditch, with tower crane the earthwork is winched to cubic metre of earth car and transport outward;
(15) carry out the construction of bed course and base plate;
(16) carry out main body construction.
Embodiment 3: (this foundation ditch was accomplished bottom slab concreting on March 15th, 2012 with concerted effort elevator (Kunshan) checkout tower foundation ditch; Just carrying out main structure construction at present) be example; This project is positioned at the high-tech industrial park, Kunshan City, Jiangsu Province; The above high about 235m in body of the tower ground will become the highest elevator test tower in the world after building up.This engineering excavation of foundation pit degree of depth is 15.10m, and flat shape is circular, diameter 45.8m.Take following construction sequence:
(1) levelling of the land: carry out levelling of the land, remove the hard thing in top layer and the underground obstacle of construction area;
(2) measure unwrapping wire:
A. the measuring point that provides according to Construction unit is a reference point, arranges the in-site measurement control point, the absolute altitude control point;
B. Surveying Control Point is arranged in the center of circle on foundation pit enclosure structure plane, and fixes and carry out protection;
C. measuring apparatus adopts total powerstation, presses the wholecircle observation procedure and measures, and each three agitation pile, each root drill-pouring soldier pile are all carried out the position measuring by stake;
D. three agitation piles are put central axis, and by the circle fluting, measuring axis pore is control stake position then;
(3) three mixing pile constructions:
A. according to three agitation pile unwrapping wire location, adopt digging machine excavation guide groove, the center line both sides are wide each 0.6 meter, dark 1.0 meters;
B., location shaped steel is set: the vertical guide slot direction is placed two location shaped steel; Specification is 200mm * 200mm, and long 2.5m places two location shaped steel specification 300mm * 300mm in the parallel guide slots direction; Be about 12m; Whenever on shaped steel, make a mark with red paint at a distance from 1.2 meters, be convenient to look in the construction stake, H shaped steel locator card is less than the guide groove sideline.
C. pile-forming machine perching: this engineering adopts three machines of ZLD150/85-3 type, and according to circular feature, every three stakes adjustment stride trend (every adjustment 2 degree 48 minutes and 45 seconds) is then with verticality≤1/250 of plumb bob observation gantry upright post verticality to guarantee a machine.Position behind the stake machine location again and check, deviate is less than 5cm.
D. cement paste preparation: water/binder ratio is 1.5, and cement adopts the P.O42.5 Portland cement, and cement mixed weight is to be stirred 20% of soil mass consolidation quality;
E. creep into and stir whitewashing: starter motor, the stake machine stirs, and subsidence velocity is 0.8m/min when whitewashing is crept in sinking, and the whitewashing amount is controlled at about 60% of whitewashing amount, divides in the stake bottom suitably to continue to stir whitewashing.
F. promote and stir whitewashing: hoisting velocity is 1.5m/min when promoting the stirring whitewashing, and the whitewashing amount is controlled at about 40% of total whitewashing amount;
G. a machine displacement and in place takes one-sided fashion of extrusion to construct, and makes three agitation piles surround a circular circle and continuous;
(4) bored pile construction:
A. according to the control point drill-pouring is carried out the position measuring by root;
B. casing is buried underground: with stake position central point is the center of circle; Dig out than the round pool about the big 300mm in design stake footpath; (the casing diameter is for the stake footpath+100mm) vertical fixing is proofreaied and correct in place, stake position with casing to adopt cross center sash weight method; Tamp with clay all around after reaching requirement, guarantee to stablize, and carry out record and carry out repetition measurement;
C. rig installation in position: this engineering adopts GPS-15 type rig, and rig is installed must level, straight, firm, guarantees that simultaneously drilling rod, rotating disk, casing center on same plumb line, accomplish sight alignment;
D. slurrying: mud property requires like following table:
| Project | Proportion | Viscosity (S) |
| Inject aperture mud | ≤1.15 | ?18～22 |
| Delivery port mud | ≤1.3 | ?20～26 |
E. drilling and forming hole: according to a design stake type, select rig for use, carry out the drilling and forming hole construction; Bit diameter should equal the intended diameter of stake, and 120 ° of drill bit taper angles will often be veritified bit size in the construction; The discovery wearing and tearing are excessive should in time be repaired, change, and guarantees that expanded diameter meets design requirement.
F. once clear hole: direct circulation rotary drilling pore-forming, creep into to projected depth, drilling tool is lifted from the bottom of the hole about 0.2m; Up and down reciprocatingly go up and down low speed revolution, full pump amount punching; Abundant larger particles soil block at the bottom of the grinding hole treats that the hole internal return goes out in the slurries no clod and can be considered once clearly that the hole finishes;
G. downcomer;
H. the clear hole of secondary;
I. concreting forms a circle bored pile that surrounds circle and interval and is positioned at said one and encloses within three agitation piles;
Soil body grouting and reinforcing between (5) three agitation piles and bored pile: compaction grouting slurries injection rate is 20%; Adopt P.O42.5 level Portland cement; Cement: flyash: water glass=1: 0.5: 0.04, water/binder ratio are 0.55, tube pulling height 0.33m; Adopt and jump span slip casting, the slip casting position is two spaces between the castinplace pile;
(6) the shallow-layer earthwork is excavated to-0.500m; Carry out first road and enclose purlin (Guan Liang) construction and maintenance to design strength; Said Guan Liang is cast in the stake top of a said circle bored pile and the main muscle of bored pile is inserted 500mm in the hat beam; Guarantee that annular encloses the purlin one-time-concreting and accomplishes, must not build several times;
(7) first roads enclose purlin absolute altitude to the second road and enclose (5.950m) the position soil excavation: the car ramp that leads in the hole is set of absolute altitude at the bottom of the purlin; And laying depth is the steel plate of 5mm; Take from the beginning of south orientation north the mode of excavation while moving back, close up at last car ramp and boundary, foundation ditch edge in the north side;
(8) second roads enclose purlin construction: carry out second road and enclose purlin construction and maintenance to design strength; Second road that guarantees annular enclose purlin and each following road thereof enclose purlin all one-time-concreting accomplish; Said second road encloses purlin and each following road thereof and encloses purlin and all be cast on the inner ring side of a said circle bored pile; And said second road encloses purlin and each following road thereof and encloses purlin and all when building, establish some muscle and joint bars of hanging, and will hang the main muscle that muscle and joint bar are welded in bored pile;
(9) second roads enclose purlin absolute altitude to the three roads and enclose the purlin absolute altitude (10.350m) position soil excavation: with small-sized digging machine north side in the foundation ditch is transported in the earthwork, long-armed digging machine rests in the outer north side of foundation ditch and fetches earth and be placed on cubic metre of earth car and transport outward;
(10) the 3rd roads enclose purlin construction: carry out the 3rd road and enclose purlin construction and maintenance to design strength, guarantee that annular encloses the purlin one-time-concreting and accomplishes, must not repeatedly build;
(11) the 3rd roads enclose the purlin absolute altitude to cheating end absolute altitude (12.600m) soil excavation: adopt the central island digging mode, with small-sized digging machine the earthwork is piled in the middle of the foundation ditch, with tower crane the earthwork is winched to cubic metre of earth car and transport outward;
(12) carry out the construction of bed course and base plate;
(13) carry out main body construction.
The foregoing description is merely the illustrative principle of the invention and effect thereof, but not is used to limit the present invention.Rights protection scope of the present invention should be listed like claims.
Claims (10)
1. a circular deep foundation ditch does not have the support constructing structure; It is characterized in that: be provided with three agitation piles of a circle, a circle bored pile and some roads and enclose purlin; Some said three agitation piles surround a circle and a continuous circle; Some said bored piles surround circle and have a circle at interval, and three agitation piles of a said circle are positioned at the periphery of a said circle bored pile, and per pass is said to enclose the annular that purlin all is the one-time-concreting moulding; It is Guan Liang that first road encloses purlin; Said Guan Liang builds in the main muscle epimere of the stake top of a said circle bored pile and said bored pile places the hat beam, and all the other enclose purlin and all are cast in the inner ring side of a said circle bored pile and are fixedly connected with bored pile, and there is spacing in the adjacent purlin in the vertical direction that encloses.
2. circular deep foundation ditch as claimed in claim 1 does not have the support constructing structure, it is characterized in that: all the other except that Guan Liang are enclosed purlin and all are provided with some muscle that hang, and saidly hang the main muscle that muscle is welded in said bored pile.
3. a circular deep foundation ditch support free construction method is characterized in that: comprise the steps:
One, three mixing pile constructions: set up three circular and continuous agitation piles of a corral;
Two, bored pile construction: within three agitation piles of a said circle, set up the circular and bored pile at interval of a corral;
Three, the soil body between three agitation piles and the bored pile adopts grouting and reinforcing;
Four, the top layer earthwork is excavated; Carry out first road then and enclose purlin construction and maintenance to design strength; It is Guan Liang that said first road encloses purlin; Said Guan Liang builds in the main muscle epimere of the stake top of a said circle bored pile and bored pile and places in the hat beam, guarantee that the hat beam one-time-concreting of annular is accomplished;
Five, continue earth excavation; Dig and enclose purlin absolute altitude position to second road; Carry out second road then and enclose purlin construction and maintenance to design strength; Said second road encloses purlin builds on the inner ring side of a said circle bored pile and is fixedly connected with bored pile, guarantee that second road of annular encloses the completion of purlin one-time-concreting;
Six, continue earth excavation; Dig and enclose purlin absolute altitude position to the 3rd road; Carry out the 3rd road then and enclose purlin construction and maintenance to design strength; Said the 3rd road encloses purlin builds on the inner ring side of a said circle bored pile and is fixedly connected with bored pile, guarantee that the 3rd road of annular encloses the completion of purlin one-time-concreting;
Seven, continue earth excavation; Dig and enclose purlin absolute altitude position to the n road; Carry out the n road then and enclose purlin construction and maintenance to design strength; Said n encloses in the road purlin and is cast on the inner ring side of a said circle bored pile and is fixedly connected with bored pile, guarantee that the n road of annular encloses the completion of purlin one-time-concreting;
Eight, continue earth excavation, dig end absolute altitude, carry out the construction of bed course and base plate then to the hole.
4. circular deep foundation ditch support free construction method as claimed in claim 3 is characterized in that: three agitation piles adopt one-sided fashion of extrusion or the jumping mode of beating to construct in said step 1.
5. circular deep foundation ditch support free construction method as claimed in claim 3 is characterized in that: before carrying out said step 1, carry out levelling of the land earlier and measure unwrapping wire.
6. circular deep foundation ditch support free construction method as claimed in claim 3; It is characterized in that: the mode of earth excavation is in the said step 5: the car ramp that leads in the hole is set; Take to begin from one side, the mode of excavation while moving back closes up at last and has a common boundary in car ramp and foundation ditch edge.
7. circular deep foundation ditch support free construction method as claimed in claim 6; It is characterized in that: the mode of earth excavation is in the said step 6: with digging machine the earthwork is transported in the foundation ditch near car ramp one side, long-armed digging machine rests in the ground on foundation ditch limit and near ramp one side-draw soil and be placed on cubic metre of earth car and transport outward.
8. circular deep foundation ditch support free construction method as claimed in claim 7; It is characterized in that: the mode of earth excavation is in said step 7 and the step 8: adopt the central island digging mode; With digging machine the earthwork is piled in the middle of the foundation ditch, the earthwork is winched to a cubic metre of earth car outward transport with tower crane.
9. circular deep foundation ditch support free construction method as claimed in claim 3 is characterized in that: all the other except that Guan Liang are enclosed purlin and all when building, are established some muscle that hang, and will hang the main muscle that muscle is welded in bored pile.
10. like each described circular deep foundation ditch support free construction method in the claim 3 to 9, it is characterized in that: complete job practices is to be undertaken by following step:
One, levelling of the land: before three mixer constructions, must carry out levelling of the land earlier, remove the hard thing in top layer and the underground obstacle of construction area;
Two, measure unwrapping wire:
A. the measuring point that provides according to Construction unit is a reference point, arranges in-site measurement control point and absolute altitude control point;
B. Surveying Control Point is arranged in the center of circle on foundation pit enclosure structure plane;
C. each three agitation pile, each root bored pile are all carried out the position measuring by stake;
D. three agitation piles are put central axis, and again by the circle fluting, measuring axis pore is control stake position then;
Three, three mixing pile constructions:
A. according to three agitation pile unwrapping wire location, adopt digging machine excavation guide groove, guide groove dimensional requirement center line both sides are wide each 0.5～0.7 meter, dark 1.0～1.5 meters;
B., location shaped steel is set: place two location shaped steel down in the vertical guide slot direction; On the parallel guide slots direction is placed two, locate shaped steel, select, on the shaped steel of last location, make mark according to stake machine size; Marking path is directly selected according to stake, so that look for the stake position in the construction;
C. pile-forming machine perching: should be according to circular feature, every three stakes adjustment stride trend notices that simultaneously cover beats overlap joint, and the gantry upright post verticality will be guaranteed verticality≤0.004 of a machine, positions after a machine is located again and checks, and deviate is less than 5cm;
D. cement paste preparation: water/binder ratio is 1.5～2.0, and cement adopts the above portland cement of P.O42.5, and cement mixed weight is to be stirred 15%～23% of soil mass consolidation quality;
E. creep into and stir whitewashing: starter motor, the stake machine stirs, and subsidence velocity is 0.5m/min～1.0m/min when whitewashing is crept in sinking, and the whitewashing amount is controlled at 50%～70% of total whitewashing amount, divides in the stake bottom suitably to continue to stir whitewashing;
F. promote and stir whitewashing: hoisting velocity is 1.0m/min～2.0m/min when promoting the stirring whitewashing, and the whitewashing amount is controlled at 30%～50% of total whitewashing amount;
G. the displacement of stake machine is also in place, takes one-sided fashion of extrusion or the jumping mode of beating to construct, and makes three agitation piles surround a circular circle and continuous;
Four, bored pile construction:
A. according to the control point bored pile is carried out the position measuring by root;
B. casing is buried underground: with stake position central point is the center of circle, digs out the round pool than the big 250mm～350mm in design stake footpath, and the casing vertical fixing is proofreaied and correct in place, stake position, tamps with clay around reaching after the requirement, guarantees to stablize, and carries out record and carry out repetition measurement;
C. rig installation in position: rig is installed must level, straight and firm, guarantees that simultaneously drilling rod, rotating disk and casing center are on same plumb line;
D. slurrying: mud property requires like following table:
E. drilling and forming hole: according to a design stake type; Select rig for use, carry out the drilling and forming hole construction, bit diameter should equal the intended diameter of stake; Drill bit taper angle should be greater than 120 °; To often veritify bit size in the construction, find in time to repair or to change when wearing and tearing are not up to standard, guarantee that expanded diameter meets design requirement;
F. once clear hole: creep into to projected depth, drilling tool is lifted from 0.15m～0.25m at the bottom of the hole, up and down reciprocatingly go up and down and the low speed revolution, and full pump amount punching, abundant larger particles soil block at the bottom of the grinding hole treats that the hole internal return goes out in the slurries no clod and can be considered once clearly that the hole finishes;
G. downcomer;
H. the clear hole of secondary;
I. concreting forms a circle bored pile that surrounds circle and interval and is positioned at said one and encloses within three agitation piles;
Five, the soil body adopts grouting and reinforcing between three agitation piles and the bored pile;
Six, top layer soil excavation; Carry out first road and enclose purlin construction and maintenance to design strength; It is that the main muscle epimere of Guan Liang and stake top that is cast in a said circle bored pile and bored pile places in the hat beam that said first road encloses purlin, guarantee that the hat beam one-time-concreting of annular is accomplished;
Seven, first road encloses purlin absolute altitude to the second road and encloses purlin absolute altitude position soil excavation: the car ramp lead in the hole is set, takes on one side from beginning, the mode of excavation while moving back closes up in car ramp and boundary, foundation ditch edge at last;
Eight, second road encloses purlin construction: carry out second road and enclose purlin construction and maintenance to design strength; Second road that guarantees annular enclose purlin and each following road thereof enclose purlin all one-time-concreting accomplish; Said second road encloses purlin and each following road thereof and encloses purlin and all be cast on the inner ring side of a said circle bored pile; And said second road encloses purlin and each following road thereof and encloses purlin and all when building, establish some muscle and joint bars of hanging, and will hang the main muscle that muscle and joint bar are welded in bored pile;
Nine, second road encloses purlin absolute altitude to the three roads and encloses purlin absolute altitude position soil excavation: with digging machine the earthwork is transported in the foundation ditch near car ramp one side, the ground that long-armed digging machine rests in the foundation ditch limit is near ramp one side-draw soil and be placed on cubic metre of earth car and transport outward;
Ten, the 3rd road encloses purlin construction: carry out the 3rd road and enclose purlin construction and maintenance to design strength;
The 11, the 3rd road encloses purlin absolute altitude to the four roads and encloses purlin absolute altitude position soil excavation: adopt the central island digging mode, with digging machine the earthwork is piled in the middle of the foundation ditch, with tower crane the earthwork is winched to a cubic metre of earth car outward transport;
The 12, the 4th road encloses purlin construction: enclose in the 3rd road and the 4th road between the purlin in the central island earthwork outward transport, carry out the 4th road and enclose purlin construction and maintenance to design strength;
13, repeating step 11 and step 12;
14, the n road encloses the purlin absolute altitude to cheating absolute altitude position, end soil excavation: adopt the central island digging mode, with digging machine the earthwork is piled in the middle of the foundation ditch, with tower crane the earthwork is winched to a cubic metre of earth car outward transport;
15, carry out the construction of bed course and base plate;
16, carry out main body construction.
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