CN102635120B - Circular deep foundation ditch is without Construction of Supporting structure and construction method - Google Patents
Circular deep foundation ditch is without Construction of Supporting structure and construction method Download PDFInfo
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Abstract
The invention discloses a kind of circular deep foundation ditch without Construction of Supporting structure and construction method, by carrying out three axes agitating pile construction, bored pile construction, Stabilizing Grout, soil excavation, first encloses purlin construction, continue soil excavation, enclose down purlin construction together, continue soil excavation, carry out the step such as bed course and construction of bottom plates, obtain a kind of primarily of a circle three axes agitating pile, one circle bored pile and multiple tracks enclose the deep footing groove enclosing structure that purlin is formed, this space enclosing structure is without any braced structures, make use of the arch effect of the soil body, reduce the soil pressure acted in space enclosing structure, also utilize the arch effect of enclosing purlin simultaneously and external loads is converted into the internal pressure acting on and enclose purlin, give full play to the feature that concrete anti-compression performance is good, and owing to not supporting, also the process of tearing support and support replacement open is just eliminated, bracing of foundation pit expense is reduced, speed of application is accelerated.
Description
Technical field
The invention belongs to the realm of building construction, specifically relate to a kind of constructing structure and construction method 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 urban land difficulty, build and become inevitable, in the exploitation process of the underground space to high-altitude and underground development, deep-foundation pit engineering becomes unavoidable problem, foundation ditch is the important component part of highrise building and heavy civil engineering, and in the transformation of mature city, base pit engineering often concentrates on area, down town.Base pit engineering is large-scale soil excavation engineering, and its most direct consequence is the distribution again causing surrounding soil ess-strain, causes the movement of surrounding formation, produces larger ground settlement and differential settlement, unfavorable to surrounding buildings environment.Light then produce building tear, cause the inconvenience of user, heavy then occur the phenomenon of line fracture, house collapse, cause the massive losses of human and material resources, financial resources.Base pit engineering is now day by day towards " dark, difficult, dangerous, large " future development, also day by day serious on the impact of environment.How to guarantee foundation ditch ontological security and reduce to have become to the protection of surrounding enviroment the difficult problem that China's engineering circles faces.
At present generally take agitation pile sealing, castinplace pile to keep off soil for deep foundation ditch, then add the construction method of inner support, or adopt diaphragm wall to keep off native sealing to add the construction method that inner support supports again.Because the above-mentioned construction method generally adopted all employ inner support, and inner support can affect shoveling speed in foundation ditch, and needs support replacement to tear support open, causes that speed of application is slow, the wasting of resources, thus causes cost high.
Summary of the invention
In order to overcome above-mentioned defect, the invention provides a kind of circular deep foundation ditch without Construction of Supporting structure and construction method, this circular deep foundation ditch eliminates support and support replacement without Construction of Supporting structure and construction method, make the reduction of bracing of foundation pit expense, speed of application quickening, make use of the arch effect of the soil body, reduce the soil pressure acted in space enclosing structure, also utilize the arch effect of enclosing purlin simultaneously and external loads is converted into the internal pressure acting on and enclose purlin, give full play to the feature that concrete anti-compression performance is good.
The present invention in order to the technical scheme solving its technical problem and adopt is:
A kind of circular deep foundation ditch is without Construction of Supporting structure, be provided with a circle three axes agitating pile, one circle bored pile and some roads enclose purlin, some described three axes agitating pile surround circle and continuous print one circle, some described bored piles surround circle and the spaced circle of tool, a described circle three axes agitating pile is positioned at the periphery of a described circle bored pile, enclosing purlin described in per pass is all the shaping annular of one-time-concreting, it is Guan Liang that first encloses purlin, described Guan Liang is cast in a described circle stake top for bored pile and the main muscle epimere of bored pile is placed in hat beam, all the other enclose purlin be all cast in described one circle bored pile inner ring side on and be fixedly connected with bored pile, there is spacing in the adjacent purlin in the vertical direction that encloses.
All the other except Guan Liang are enclosed purlin and are all provided with and somely hang muscle, described in hang the main muscle that muscle is welded in described bored pile.
A kind of circular deep foundation ditch support free construction method, comprises the steps:
One, three axes agitating pile construction: set up a corral circular and continuous print three axes agitating pile;
Two, bored pile construction: set up a corral circular and the bored pile at interval within a described circle three axes agitating pile;
Three, the soil body between three axes agitating pile and bored pile adopts grouting and reinforcing;
Four, the top layer earthwork is excavated, then carry out first enclose purlin construction and maintenance to design strength, it is Guan Liang that described first encloses purlin, described Guan Liang is cast in a described circle stake top for bored pile and the main muscle of bored pile is placed in hat beam, ensure that the hat beam one-time-concreting of annular completes;
Five, earth excavation is continued, dig to second and enclose purlin elevation location, then carry out second enclose purlin construction and maintenance to design strength, described second enclose purlin be cast in described one circle bored pile inner ring side on and be fixedly connected with bored pile, ensure that the second of annular encloses purlin one-time-concreting and completes;
Six, earth excavation is continued, dig and enclose purlin elevation location to the 3rd road, then carry out the 3rd road enclose purlin construction and maintenance to design strength, described 3rd road enclose purlin be cast in described one circle bored pile inner ring side on and be fixedly connected with bored pile, ensure that the 3rd road of annular encloses purlin one-time-concreting and completes;
Seven, earth excavation is continued, Wa Zhi n-th encloses purlin elevation location in road, then carry out the n-th road enclose purlin construction and maintenance to design strength, described n-th road enclose purlin be cast in described one circle bored pile inner ring side on and be fixedly connected with bored pile, ensure that the n-th road of annular encloses purlin one-time-concreting and completes;
Eight, continue earth excavation, dig to hole end absolute altitude, then carry out bed course and construction of bottom plates.
In described step one, three axes agitating pile adopts one-sided compression mode or jumps the mode of beating and constructs.
Before carrying out described step one, first carry out levelling of the land and surveying setting-out.
In described step 5, the mode of earth excavation is: arrange the car ramp that leads in hole, take from, move back while the mode excavated, finally close up in car ramp and margin of foundation pit and have a common boundary.
In described step 6, the mode of earth excavation is: the earthwork to be transported near car ramp side in foundation ditch with digging machine, and long-armed digging machine rests in the ground on foundation ditch limit and fetches earth near side, ramp and be placed on cubic metre of earth car and transport outward.
In described step 7 and step 8, the mode of earth excavation is: adopt central island digging mode, pile in the middle of foundation ditch with digging machine by the earthwork, with tower crane, the earthwork is winched to a cubic metre of earth car outward transport.
All the other except Guan Liang are enclosed purlin and are all established when building and somely hang muscle, and will hang muscle and be welded in the main muscle of bored pile.
Complete construction method is carried out in the steps below:
One, levelling of the land: before three axle mixer constructions, first must carry out levelling of the land, remove top layer hard object and the underground obstacle of construction area;
Two, surveying setting-out:
A. the measuring point provided according to Construction unit is reference point, arranges in-site measurement control point and absolute altitude control point;
B. Survey control point is arranged in the center of circle of foundation pit enclosure structure plane;
C. all by stake, position measuring is carried out to each width three axes agitating pile, each root bored pile;
D. three axes agitating pile puts central axis, then by circle fluting, then measuring axis pore is for controlling stake position;
Three, three axes agitating pile construction:
A. according to three axes agitating 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: under vertical guide slot direction places two, locate shaped steel, place in parallel guide slots direction on two and locate shaped steel, select according to stake machine size, mark made by upper location shaped steel, marking path is selected according to stake footpath, so that look for stake position in construction;
C. pile-forming machine perching: should according to circular feature, every three axle stake adjustment stride trends, notice that overlap joint beaten by cover, gantry upright post verticality will guarantee verticality≤0.004 of a machine, and position after position of p ile machine again and check, deviate is less than 5cm simultaneously;
D. cement paste preparation: water/binder ratio is 1.5 ~ 2.0, cement adopts more than P.O42.5 portland cement, and cement mixed weight is be stirred soil mass consolidation quality 15% ~ 23%;
E. creep into and stir whitewashing: starter motor, stake machine stirs, and when whitewashing is crept in sinking, subsidence velocity is 0.5m/min ~ 1.0m/min, and whitewashing amount controls measure in total whitewashing 50% ~ 70%, in the suitable Keep agitation whitewashing of stake bottom part;
F. promote and stir whitewashing: promoting hoisting velocity when stirring whitewashing is 1.0m/min ~ 2.0m/min, and whitewashing amount controls measure in total whitewashing 30% ~ 50%;
G. stake machine displacement in place, takes one-sided compression mode or jumps the mode of beating to construct, and makes three axes agitating pile enclose a conglobate circle and continuous;
Four, bored pile construction:
A. position measuring is carried out according to dominating pair of vertices bored pile by root;
B. shield-tube embedment: with stake position central point for the center of circle, dig out the round pool than the design large 250mm ~ 350mm in stake footpath, casing is vertically fixed on stake position place and corrects, after reaching requirement, surrounding clay tamps, and guarantees to stablize, and makes a record and carry out repetition measurement;
C. rig installation in position: rig is installed must level, straight and firm, ensures that drilling rod, rotating disk and casing center are on same plumb line simultaneously;
D. slurrying: mud property requires as 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 design pile-type, select rig, carry out drilling and forming hole construction, bit diameter should equal the intended diameter of stake, bit conical angle should be greater than 120 °, often to veritify bit size in construction, should repair in time or change when finding that wearing and tearing are not up to standard, ensure that expanded diameter meets design requirement;
F. once clear hole: creep into projected depth, by 0.15m ~ 0.25m at the bottom of drilling tool lift-off hole, up and down reciprocatingly lifting low speed revolution, and full pump amount punching, larger particles soil block at the bottom of abundant grinding hole, treats to return out in hole in slurries and can be considered that once hole is complete clearly without clod;
G. downcomer;
H. secondary pile hole cleaning;
I. concreting, formed surround circle and one of interval circle bored pile and be positioned at described one circle three axes agitating pile within;
Five, between three axes agitating pile and bored pile, the soil body adopts grouting and reinforcing;
Six, top layer soil excavation, carry out first enclose purlin construction and maintenance to design strength, described first enclose purlin be Guan Liang and be cast in described one circle the stake top of bored pile and the main muscle epimere of bored pile be placed in hat beam in, ensure that the hat beam one-time-concreting of annular completes;
Seven, first encloses purlin absolute altitude to second and encloses purlin elevation location soil excavation: arrange the car ramp that leads in hole, take from, move back while the mode excavated, finally close up in car ramp and margin of foundation pit and have a common boundary;
Eight, second enclose purlin construction: carry out second enclose purlin construction and maintenance to design strength, ensure the second of annular enclose purlin and following each road thereof enclose purlin all one-time-concreting complete, described second encloses purlin and following each road thereof and encloses purlin and be all cast on the inner ring side of a described circle bored pile, and described second encloses purlin and following each road thereof encloses purlin and all establish when building and somely hang muscle and joint bar, and will muscle and joint bar be hung be welded in the main muscle of bored pile;
Nine, second encloses purlin absolute altitude and encloses purlin elevation location soil excavation to the 3rd road: the earthwork to be transported near car ramp side in foundation ditch with digging machine, fetches earth near side, ramp and be placed on cubic metre of earth car and transport outward in the ground that long-armed digging machine rests in foundation ditch limit;
Ten, the 3rd road enclose purlin construction: carry out the 3rd road enclose purlin construction and maintenance to design strength;
11, the 3rd road encloses purlin absolute altitude and encloses purlin elevation location soil excavation to the 4th road: adopt central island digging mode, pile in the middle of foundation ditch with digging machine by the earthwork, with tower crane, the earthwork is winched to a cubic metre of earth car outward transport;
12, the 4th road encloses purlin construction: while the 3rd road and the 4th road to enclose between purlin central island earthwork outward transport, carry out the 4th road enclose purlin construction and maintenance to design strength;
13, step 11 and step 12 is repeated;
14, n-th road encloses purlin absolute altitude to hole end elevation location soil excavation: adopt central island digging mode, pile in the middle of foundation ditch with digging machine by the earthwork, with tower crane, the earthwork is winched to a cubic metre of earth car outward transport;
15, bed course and construction of bottom plates is carried out;
16, main body construction is carried out.
The invention has the beneficial effects as follows: circular deep foundation ditch of the present invention eliminates braced structures without Construction of Supporting structure and construction method and tears the process of support support replacement open, make the reduction of bracing of foundation pit expense, speed of application quickening, and make use of the arch effect of the soil body, reduce the soil pressure acted in space enclosing structure, also utilize the arch effect of enclosing purlin simultaneously and external loads is converted into the internal pressure acting on and enclose purlin, give full play to the feature that concrete anti-compression performance is good.
Accompanying drawing explanation
Fig. 1 is plan view of the present invention;
Fig. 2 is sectional view of the present invention;
Fig. 3 be of the present invention enclose purlin place hang muscle and joint bar schematic diagram.
Detailed description of the invention
Embodiment 1: a kind of circular deep foundation ditch is without Construction of Supporting structure, be provided with a circle three axes agitating pile 1, one circle bored pile 2 and some roads enclose purlin 3, some described three axes agitating pile surround circle and continuous print one circle, some described bored piles surround circle and the spaced circle of tool, a described circle three axes agitating pile is positioned at the periphery of a described circle bored pile, enclosing purlin described in per pass is all the shaping annular of one-time-concreting, it is Guan Liang that first encloses purlin, described Guan Liang is cast in a described circle stake top for bored pile and the main muscle of bored pile will be placed in hat beam, all the other enclose purlin be all cast in described one circle bored pile inner ring side on and be fixedly connected with bored pile, there is spacing in the adjacent purlin in the vertical direction that encloses.
All the other except Guan Liang are enclosed purlin and are all provided with and somely hang muscle 4 and joint bar 5, described in hang the main muscle 21 that muscle and joint bar are welded in described 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 axle mixer constructions, first must carry out levelling of the land, remove top layer hard object and the underground obstacle of construction area, can adopt pading plate method to be convenient to pile frame walking to strengthen load-bearing load;
(2) surveying setting-out:
A. the measuring point provided according to Construction unit is reference point, arranges in-site measurement control point and absolute altitude control point;
B. Survey control point is arranged in the center of circle of foundation pit enclosure structure plane;
C. all by stake, position measuring is carried out to each width three axes agitating pile, each root bored pile;
D. three axes agitating pile puts central axis, and by circle fluting, then measuring axis pore is for controlling stake position;
(3) three axes agitating pile construction
A. according to three axes agitating 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. arrange location shaped steel: shaped steel is located under placing two in vertical guide slot direction, specification is H200mm × 200mm, is about 2.5m; Place in parallel guide slots direction on two and locate shaped steel, specification H300mm × 300mm, H350mm × 350mm or H400mm × 400mm, is about 8 ~ 20m; Select according to stake machine size, mark made by upper location shaped steel, and marking path is selected according to stake footpath, so that look for stake position in construction.
C. pile-forming machine perching: should according to circular feature, every three axle stakes adjustment strides trends, notice that overlap joint beaten by cover simultaneously, accomplish to stablize, straight and even.Gantry upright post verticality will guarantee verticality≤1/250 of a machine.Position after position of p ile machine again and check, deviate is less than 5cm.
D. cement paste preparation: generally water/binder ratio is 1.5 ~ 2.0, cement adopts more than P.O42.5 Portland cement, and cement mixed weight is be stirred soil mass consolidation quality 15 ~ 23%;
E. creep into and stir whitewashing: starter motor, stake machine stirs, and when whitewashing is crept in sinking, subsidence velocity is 0.5m/min ~ 1.0m/min, and whitewashing amount controls measure in total whitewashing about 60%, in the suitable Keep agitation whitewashing of stake bottom part.
F. promote and stir whitewashing: promoting hoisting velocity when stirring whitewashing is 1.0m/min ~ 2.0m/min, and whitewashing amount controls measure in total whitewashing about 40%;
G. stake machine displacement in place, takes one-sided compression mode or jumps the mode of beating to construct, and makes three axes agitating pile enclose a conglobate circle and continuous;
(4) bored pile construction
A. position measuring is carried out according to dominating pair of vertices bored pile by root;
B. shield-tube embedment: with stake position central point for the center of circle, dig out the round pool than design large about the 300mm in stake footpath, casing is vertically fixed on stake position place and corrects, after reaching requirement, surrounding clay tamps, and guarantees to stablize, and makes a record and carry out repetition measurement;
C. rig installation in position: rig is installed must level, straight, firm, ensures that drilling rod, rotating disk, casing center are on same plumb line, accomplish sight alignment simultaneously;
D. slurrying: mud property requires as 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 design pile-type, select rig, carry out drilling and forming hole construction, bit diameter should equal the intended diameter of stake, bit conical angle should be greater than 120 °, often to veritify bit size in construction, find that wearing and tearing excessively should to repair in time, to change, ensure that expanded diameter meets design requirement.
F. once clear hole: creep into projected depth, by about 0.2m at the bottom of drilling tool lift-off hole, be up and down reciprocatingly elevated, low speed turns round, the punching of full pump amount, larger particles soil block at the bottom of abundant grinding hole, treats to return out in hole in slurries to can be considered that once hole is complete clearly without clod;
G. downcomer;
H. secondary pile hole cleaning;
I. concreting, formed surround circle and one of interval circle bored pile and be positioned at described one circle three axes agitating pile within;
(5) between three axes agitating pile and bored pile, the soil body adopts grouting and reinforcing;
(6) shallow-layer (top layer) soil excavation, carry out first enclose purlin (Guan Liang) construction and maintenance to design strength, described Guan Liang builds in a described circle stake top for bored pile and the main muscle epimere of bored pile will be inserted in hat beam, ensure that the first of annular encloses purlin one-time-concreting and completes, must not build several times;
(7) first encloses purlin absolute altitude to second and encloses purlin elevation location soil excavation: can arrange the car ramp led in hole, take from, move back while the mode excavated, finally close up in car ramp and margin of foundation pit and have a common boundary;
(8) second enclose purlin construction: carry out second enclose purlin construction and maintenance to design strength, ensure the second of annular enclose purlin and following each road thereof enclose purlin all one-time-concreting complete, described second encloses purlin and following each road thereof and encloses purlin and all build on the inner ring side of a described circle bored pile, and described second encloses purlin and following each road thereof encloses purlin and all establish when building and somely hang muscle 4 and joint bar 5, and will muscle and joint bar be hung be welded in the main muscle 21 of bored pile, as shown in Figure 3;
(9) second encloses purlin absolute altitude and encloses purlin elevation location soil excavation to the 3rd road: the earthwork to be transported near earthwork outward transport car ramp side in foundation ditch with Miniature digging machine, and long-armed digging machine rests in foundation ditch limit, ground and fetches earth near side, ramp and be placed on cubic metre of earth car and transport outward;
(10) the 3rd roads enclose purlin construction: carry out the 3rd road enclose purlin construction and maintenance to design strength, ensure that annular encloses purlin one-time-concreting and completes, must not build several times;
(11) the 3rd roads enclose purlin absolute altitude and enclose purlin elevation location soil excavation to the 4th road: adopt central island digging mode, pile in the middle of foundation ditch with Miniature digging machine by the earthwork, with tower crane, the earthwork are winched to a cubic metre of earth car outward transport;
(12) the 4th roads enclose purlin construction: while the 3rd road and the 4th road to enclose between purlin central island earthwork outward transport, carry out the 4th road enclose purlin construction and maintenance to design strength, ensure that annular encloses purlin one-time-concreting and completes, must not build several times;
(13) (11) and (12) are repeated;
(14) n-th roads enclose purlin absolute altitude to hole end elevation location soil excavation: adopt central island digging mode, pile in the middle of foundation ditch with Miniature digging machine by the earthwork, with tower crane, the earthwork are winched to a cubic metre of earth car outward transport;
(15) bed course and construction of bottom plates is carried out;
(16) main body construction is carried out.
Embodiment 3: (this foundation ditch completes bottom slab concreting on March 15th, 2012 with concerted effort elevator (Kunshan) checkout tower foundation ditch, now just carry out main structure construction) be example, this project is positioned at high-tech industrial park, Kunshan City, Jiangsu Province, the above height in tower body ground about 235m, will become the highest elevator experimental tower in the world after building up.This Deep Foundation Pit cutting 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, removes top layer hard object and the underground obstacle of construction area;
(2) surveying setting-out:
A. the measuring point provided according to Construction unit is reference point, arranges in-site measurement control point, absolute altitude control point;
B. Survey control point is arranged in the center of circle of foundation pit enclosure structure plane, and is fixed and carries out protection;
C. measuring apparatus adopts total powerstation, measures, all carry out position measuring by stake to each width three axes agitating pile, each root drill-pouring soldier pile by wholecircle observation procedure;
D. three axes agitating pile puts central axis, and by circle fluting, then measuring axis pore is for controlling stake position;
(3) three axes agitating pile construction:
A. according to three axes agitating pile unwrapping wire location, adopt digging machine excavation guide groove, center line both sides are wide each 0.6 meter, dark 1.0 meters;
B., location shaped steel is set: two location shaped steel are placed in vertical guide slot direction, specification is 200mm × 200mm, long 2.5m, two location shaped steel specification 300mm × 300mm are placed in parallel guide slots direction, be about 12m, shaped steel makes a mark with red paint every 1.2 meters, looks for stake position in constructability, H profile steel locator card is less than guide groove sideline.
C. pile-forming machine perching: this engineering adopts ZLD150/85-3 type three axle machine, according to circular feature, every three axle stakes adjustment strides trend (every adjustment 2 degree 48 points and 45 seconds), then observe gantry upright post verticality to guarantee verticality≤1/250 of a machine with plumb bob.Position after position of p ile machine again and check, deviate is less than 5cm.
D. cement paste preparation: water/binder ratio is 1.5, cement adopts P.O42.5 Portland cement, and cement mixed weight is be stirred soil mass consolidation quality 20%;
E. creep into and stir whitewashing: starter motor, stake machine stirs, and when whitewashing is crept in sinking, subsidence velocity is 0.8m/min, and whitewashing amount controls in about 60% of whitewashing amount, in the suitable Keep agitation whitewashing of stake bottom part.
F. promote and stir whitewashing: promoting hoisting velocity when stirring whitewashing is 1.5m/min, and whitewashing amount controls measure in total whitewashing about 40%;
G. stake machine displacement in place, takes one-sided compression mode to construct, and makes three axes agitating pile enclose a conglobate circle and continuously;
(4) bored pile construction:
A. position measuring is carried out according to dominating pair of vertices drill-pouring by root;
B. shield-tube embedment: with stake position central point for the center of circle, dig out the round pool of about 300mm larger than design stake footpath, adopt cross searching sash weight method that casing (casing diameter is stake footpath+100mm) is vertically fixed on stake position place to correct, after reaching requirement, surrounding clay tamps, guarantee to stablize, and make a record and carry out repetition measurement;
C. rig installation in position: this engineering adopts GPS-15 type rig, rig is installed must level, straight, firm, ensures that drilling rod, rotating disk, casing center are on same plumb line, accomplish sight alignment simultaneously;
D. slurrying: mud property requires as 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 design pile-type, select rig, carry out drilling and forming hole construction, bit diameter should equal the intended diameter of stake, and bit conical angle 120 °, often will veritify bit size in construction, find that wearing and tearing excessively should to repair in time, to change, ensure that expanded diameter meets design requirement.
F. once clear hole: normal circulation slewing drilling machine enters pore-forming, creeps into projected depth, by about 0.2m at the bottom of drilling tool lift-off hole, up and down reciprocatingly be elevated, low speed turns round, the punching of full pump amount, larger particles soil block at the bottom of abundant grinding hole, treats to return out in hole in slurries and can be considered that once clear hole is complete without clod;
G. downcomer;
H. secondary pile hole cleaning;
I. concreting, formed surround circle and one of interval circle bored pile and be positioned at described one circle three axes agitating pile within;
(5) Stabilizing Grout between three axes agitating pile 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 is 0.55, tube pulling height 0.33m, adopt and jump span slip casting, slip casting position is the space between two castinplace piles;
(6) the shallow-layer earthwork is excavated to-0.500m, carry out first enclose purlin (Guan Liang) construction and maintenance to design strength, described Guan Liang is cast in a described circle stake top for bored pile and the main muscle of bored pile inserts 500mm in hat beam, ensure that annular encloses purlin one-time-concreting and completes, must not build several times;
(7) first encloses purlin absolute altitude to second and encloses absolute altitude (-5.950m) position soil excavation at the bottom of purlin: arrange the car ramp led in hole, and laying depth is the steel plate of 5mm, take from south orientation north, move back while the mode excavated, finally close up in north side car ramp and margin of foundation pit and have a common boundary;
(8) second enclose purlin construction: carry out second enclose purlin construction and maintenance to design strength, ensure the second of annular enclose purlin and following each road thereof enclose purlin all one-time-concreting complete, described second encloses purlin and following each road thereof and encloses purlin and be all cast on the inner ring side of a described circle bored pile, and described second encloses purlin and following each road thereof encloses purlin and all establish when building and somely hang muscle and joint bar, and will muscle and joint bar be hung be welded in the main muscle of bored pile;
(9) second encloses purlin absolute altitude and encloses purlin absolute altitude (-10.350m) position soil excavation to the 3rd road: with Miniature digging machine, north side in foundation ditch is transported in the earthwork, and 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 enclose purlin construction and maintenance to design strength, ensure that annular encloses purlin one-time-concreting and completes, must not repeatedly build;
(11) the 3rd roads enclose purlin absolute altitude to hole end absolute altitude (-12.600m) soil excavation: adopt central island digging mode, pile in the middle of foundation ditch with Miniature digging machine by the earthwork, with tower crane, the earthwork are winched to a cubic metre of earth car outward transport;
(12) bed course and construction of bottom plates is carried out;
(13) main body construction is carried out.
Above-described embodiment is only the illustrative principle of the invention and effect thereof, but not for limiting the present invention.The scope of the present invention, should listed by claims.
Claims (1)
1. a circular deep foundation ditch support free construction method, is characterized in that: complete construction method is carried out in the steps below:
One, levelling of the land: before three axle mixer constructions, first must carry out levelling of the land, remove top layer hard object and the underground obstacle of construction area;
Two, surveying setting-out:
A. the measuring point provided according to Construction unit is reference point, arranges in-site measurement control point and absolute altitude control point;
B. Survey control point is arranged in the center of circle of foundation pit enclosure structure plane;
C. all by stake, position measuring is carried out to each width three axes agitating pile, each root bored pile;
D. three axes agitating pile puts central axis, then by circle fluting, then measuring axis pore is for controlling stake position;
Three, three axes agitating pile construction:
A. according to three axes agitating 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: under vertical guide slot direction places two, locate shaped steel, place in parallel guide slots direction on two and locate shaped steel, select according to stake machine size, mark made by upper location shaped steel, marking path is selected according to stake footpath, so that look for stake position in construction;
C. pile-forming machine perching: should according to circular feature, every three axle stake adjustment stride trends, notice that overlap joint beaten by cover, gantry upright post verticality will guarantee verticality≤0.004 of a machine, and position after position of p ile machine again and check, deviate is less than 5cm simultaneously;
D. cement paste preparation: water/binder ratio is 1.5 ~ 2.0, cement adopts more than P.O42.5 portland cement, and cement mixed weight is be stirred soil mass consolidation quality 15% ~ 23%;
E. creep into and stir whitewashing: starter motor, stake machine stirs, and when whitewashing is crept in sinking, subsidence velocity is 0.5m/min ~ 1.0m/min, and whitewashing amount controls measure in total whitewashing 50% ~ 70%, in the suitable Keep agitation whitewashing of stake bottom part;
F. promote and stir whitewashing: promoting hoisting velocity when stirring whitewashing is 1.0m/min ~ 2.0m/min, and whitewashing amount controls measure in total whitewashing 30% ~ 50%;
G. stake machine displacement in place, takes one-sided compression mode or jumps the mode of beating to construct, and makes three axes agitating pile enclose a conglobate circle and continuous;
Four, bored pile construction:
A. position measuring is carried out according to dominating pair of vertices bored pile by root;
B. shield-tube embedment: with stake position central point for the center of circle, dig out the round pool than the design large 250mm ~ 350mm in stake footpath, casing is vertically fixed on stake position place and corrects, after reaching requirement, surrounding clay tamps, and guarantees to stablize, and makes a record and carry out repetition measurement;
C. rig installation in position: rig is installed must level, straight and firm, ensures that drilling rod, rotating disk and casing center are on same plumb line simultaneously;
D. slurrying: mud property requires as following table:
E. drilling and forming hole: according to design pile-type, select rig, carry out drilling and forming hole construction, bit diameter should equal the intended diameter of stake, bit conical angle should be greater than 120 °, often to veritify bit size in construction, should repair in time or change when finding that wearing and tearing are not up to standard, ensure that expanded diameter meets design requirement;
F. once clear hole: creep into projected depth, by 0.15m ~ 0.25m at the bottom of drilling tool lift-off hole, up and down reciprocatingly lifting low speed revolution, and full pump amount punching, larger particles soil block at the bottom of abundant grinding hole, treats to return out in hole in slurries and can be considered that once hole is complete clearly without clod;
G. downcomer;
H. secondary pile hole cleaning;
I. concreting, formed surround circle and one of interval circle bored pile and be positioned at described one circle three axes agitating pile within;
Five, between three axes agitating pile and bored pile, the soil body adopts grouting and reinforcing;
Six, top layer soil excavation, carry out first enclose purlin construction and maintenance to design strength, described first enclose purlin be Guan Liang and be cast in described one circle the stake top of bored pile and the main muscle epimere of bored pile be placed in hat beam in, ensure that the hat beam one-time-concreting of annular completes;
Seven, first encloses purlin absolute altitude to second and encloses purlin elevation location soil excavation: arrange the car ramp that leads in hole, take from, move back while the mode excavated, finally close up in car ramp and margin of foundation pit and have a common boundary;
Eight, second enclose purlin construction: carry out second enclose purlin construction and maintenance to design strength, ensure the second of annular enclose purlin and following each road thereof enclose purlin all one-time-concreting complete, described second encloses purlin and following each road thereof and encloses purlin and be all cast on the inner ring side of a described circle bored pile, and described second encloses purlin and following each road thereof encloses purlin and all establish when building and somely hang muscle and joint bar, and will muscle and joint bar be hung be welded in the main muscle of bored pile;
Nine, second encloses purlin absolute altitude and encloses purlin elevation location soil excavation to the 3rd road: the earthwork to be transported near car ramp side in foundation ditch with digging machine, fetches earth near side, ramp and be placed on cubic metre of earth car and transport outward in the ground that long-armed digging machine rests in foundation ditch limit;
Ten, the 3rd road enclose purlin construction: carry out the 3rd road enclose purlin construction and maintenance to design strength;
11, the 3rd road encloses purlin absolute altitude and encloses purlin elevation location soil excavation to the 4th road: adopt central island digging mode, pile in the middle of foundation ditch with digging machine by the earthwork, with tower crane, the earthwork is winched to a cubic metre of earth car outward transport;
12, the 4th road encloses purlin construction: while the 3rd road and the 4th road to enclose between purlin central island earthwork outward transport, carry out the 4th road enclose purlin construction and maintenance to design strength;
13, step 11 and step 12 is repeated;
14, n-th road encloses purlin absolute altitude to hole end elevation location soil excavation: adopt central island digging mode, pile in the middle of foundation ditch with digging machine by the earthwork, with tower crane, the earthwork is winched to a cubic metre of earth car outward transport;
15, bed course and construction of bottom plates is carried out;
16, main body construction is carried out.
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|---|---|---|---|---|
| CN103967016A (en) * | 2013-02-06 | 2014-08-06 | 上海城地建设股份有限公司 | Novel vertical pit support structure and construction method thereof |
| CN103526763A (en) * | 2013-09-22 | 2014-01-22 | 中冶天工上海十三冶建设有限公司 | Cast-in-place pile, root pile and jet grouting pile composite-type foundation pit supporting method |
| CN103669369B (en) * | 2013-12-23 | 2015-11-04 | 中国建筑第八工程局有限公司 | The supporting and protection structure of foundation ditch and supporting method |
| CN103741696A (en) * | 2013-12-23 | 2014-04-23 | 广西科技大学 | Vertical enclosing purlin added inner support system |
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| CN109736322A (en) * | 2018-12-30 | 2019-05-10 | 中铁十四局集团有限公司 | Building enclosure forming method |
| CN110130357B (en) * | 2019-04-01 | 2021-05-04 | 南京市第九建筑安装工程有限公司 | Construction method of cast-in-place pile top inserting type steel combined stirring pile foundation pit supporting system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800512A (en) * | 2005-01-07 | 2006-07-12 | 中船第九设计研究院 | Support free construction method for super large diameter circular deep foundation ditch |
| CN201459770U (en) * | 2009-03-11 | 2010-05-12 | 浙江中成建工集团有限公司 | Joint structure between two different fender bodies in deep foundation pit |
| CN102268875A (en) * | 2011-01-28 | 2011-12-07 | 中天建设集团有限公司天津分公司 | Foundation pit timbering construction method by overcoring bored piles in two rows of stirring piles |
| CN102286981A (en) * | 2011-07-15 | 2011-12-21 | 深圳市鸿荣轩建设工程有限公司 | Waterproof curtain and construction method thereof |
| CN202519677U (en) * | 2012-05-04 | 2012-11-07 | 张全胜 | Unstayed construction structure of round deep foundation pit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61261527A (en) * | 1985-05-15 | 1986-11-19 | Nippon Steel Corp | Side wall structure for round underground type structure |
-
2012
- 2012-05-04 CN CN201210134562.6A patent/CN102635120B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800512A (en) * | 2005-01-07 | 2006-07-12 | 中船第九设计研究院 | Support free construction method for super large diameter circular deep foundation ditch |
| CN201459770U (en) * | 2009-03-11 | 2010-05-12 | 浙江中成建工集团有限公司 | Joint structure between two different fender bodies in deep foundation pit |
| CN102268875A (en) * | 2011-01-28 | 2011-12-07 | 中天建设集团有限公司天津分公司 | Foundation pit timbering construction method by overcoring bored piles in two rows of stirring piles |
| CN102286981A (en) * | 2011-07-15 | 2011-12-21 | 深圳市鸿荣轩建设工程有限公司 | Waterproof curtain and construction method thereof |
| CN202519677U (en) * | 2012-05-04 | 2012-11-07 | 张全胜 | Unstayed construction structure of round deep foundation pit |
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