CN104343130A - Large-diameter manual hole digging expanded base pile foundation construction method - Google Patents
Large-diameter manual hole digging expanded base pile foundation construction method Download PDFInfo
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- CN104343130A CN104343130A CN201310314783.6A CN201310314783A CN104343130A CN 104343130 A CN104343130 A CN 104343130A CN 201310314783 A CN201310314783 A CN 201310314783A CN 104343130 A CN104343130 A CN 104343130A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
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- General Engineering & Computer Science (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
Disclosed is a large-diameter manual hole digging expanded base pile foundation construction method. The method is characterized by comprising the following steps of a, construction preparation, b, surveying and setting-out, c, hole-forming digging and spoil displacement, d, hole pile protecting wall concrete pouring, e, intermediate-strength mantle rock finished hole construction, f, pile reinforcement cage construction, g, pile core concrete pouring, and h, pile top over-height design for achieving pile construction. The large-diameter manual hole digging expanded base pile foundation construction method has the advantage of, by computing base area according to the design method for a natural foundation, omitting single-pile load test, being safe and reliable in construction, ensuring construction schedule and engineering quality, reducing engineering costs and saving the cost ratio of an expanded base file by more than 20% compared with other forms of foundations.
Description
Technical field
The present invention relates to a kind of pier foundation construction method, specifically, is a kind of major diameter artificial digging pedestal pier foundation construction method.
Background technology
Major diameter borehole pier foundation originates from the U.S., and Japan has just started application since the thirties in 20th century, and China uses in region following the line of the sea the seventies at first, so far existing more than 30 year history.Current major diameter borehole pier foundation is widely used in industry with civilian construction, this is because it to have bearing capacity high, manually digging hole facility are simple, noiselessness, friction, free from environmental pollution, expand end bearing stratum and be convenient to check, easily ensure the quality of products, manually digging hole expense is low, has vast potential for future development.But due to the complexity of major project and the diversity of engineering site condition, major diameter borehole quality and safety operation have certain danger.
Therefore known major diameter artificial digging pedestal pier foundation construction method also exists above-mentioned all inconvenience and problem.
Summary of the invention
Object of the present invention, is to propose a kind of major diameter artificial digging pedestal pier foundation construction method.
For achieving the above object, technical solution of the present invention is:
A kind of major diameter artificial digging pedestal pier foundation construction method, is characterized in that comprising the following steps:
A, preparation of construction
Be familiar with construction drawing, engineering geology, hydrologic condition data and underground utilities situation; By every technical data of the clear and definite pier foundation of design drawing requirement; Reinforcing cage is performed by designing requirement division system;
B, surveying setting-out
The Surveying control achievement provided according to Construction unit and the network for location of artificial digging pedestal pier, total powerstation is adopted to measure each axial control network and height datum point, determining Dun Wei center, take mid point as the center of circle, adds dado thickness for radius draw the circumference on top with pier shaft radius;
C, pore-forming excavation and spoir, comprise following steps:
(1) borehole is by manual operation, successively excavates from top to bottom, rear perimeter edge first, first dark rear shallow, often saves digging depth 1000mm, after upper strata retaining wall concrete just tool intensity, dig under can continuing under normal geological environment;
(2) borehole pier unearthed 0.5t, 3KW mobile lift loop wheel machine, well-bucket volume is 0.1m
3;
(3) expand bottom part first dig cylinder, after repair from top to bottom expand be shaped, reamer pitch cone body lateral face and horizontal plane inclination angle≤45 °;
(4) borehole is by native rock layers, carries out original record respectively, and gets and stay rock sample, preserves as geologic information, and is equipped with submersible pump and blast fan air-supply, air output > 1.5 m
3/ min; 6Kg/cm during nose embedding weathered rock formation
2air compressor air feed, use pneumatic pick rock drilling;
(5) when well-bucket leaves 1.5m above aperture, promote activity safety cover plate, shelter aperture, prevent from unloading the soil block of soil, stone foreign material fall in hole and hurt sb.'s feelings;
(6) pier hole is dug to prescribed depth, checks diameter and the borehole wall circular arc degree in pier hole with a pricker, vertically smooth-going up and down, finishing hole wall;
D, hole pier breast wall concrete are built, and comprise following steps:
(1) dado template adopts arc-shaped steel template, is connected and fixed with buckle, often saves dado template assembled by four pieces of punching blocks;
(2) template periphery and middle adopt 5cm plank be sawn into template inside the circular arc that matches, be circumferentially divided into four pieces, overlapping stickfast is carried out horizontal enclosure and is fixed, and the upper and lower twice of every mould are arranged;
(3) first segment retaining wall length answers >=1000mm, and end face should exceed 150 ~ 200mm than place, all will demarcate at first segment retaining wall suitable for reading by pier position axis and elevation;
(4) concrete guard wall and the borehole borehole wall in conjunction with firmly, should separately squeeze into the reinforcing bar of hole wall length 1000mm φ 16 if desired;
(5) pore-forming shoveling is poured into retaining wall and is hocketed, and often to save as a construction circulation, retaining wall often saves General Requirements height 1000mm, the lap length >=100mm of upper and lower joint retaining wall concrete;
(6) breast wall concrete adopts concrete chute from foundation ditch transports under foundation ditch or directly uses transported in hand truck fashion, when building breast wall concrete, with reinforcing bar, concrete vibrating is closely knit;
(7) breast wall concrete must ensure closely knit; Dado template adopts and tears joint open, a lower joint repeats turnover and uses, and dado template is removed and should be carried out at 24 hours later;
(8) in order to ensure the verticality of pier, require often to have watered three joint retaining walls, palpus check pier center and verticality are once;
The whole hole construction of e, middle decomposed rock, comprises following steps:
(1) bearing stratum inspection
Pier hole is dug to design elevation at the bottom of hole, drills through following core at the bottom of hole or soil sample friendship relevant personnel qualification, when qualification reaches design bearing stratum, carry out relative recording in time, carry out reaming at the bottom of hole, dig enlarged footing and first dig pile body cylinder, then accomplish expansion end shape and the dark rock degree of depth from top to bottom;
(2) whole hole is checked and accepted
Pore-forming Hou Dun center, verticality, enter the rock degree of depth, and pier Bottom Shape and enlarged footing physical dimension will reach designing requirement, organized checked and accepted by Party A, management, construction, design, surveying unit, takes out rock sample whole hole after qualification reaches designing requirement at the bottom of pier;
F, pier reinforcing cage are constructed, and comprise following steps:
(1) reinforcing cage makes shaping at the construction field (site), and reinforcing cage clips and main muscle adopt spot-welded firm;
(2) reinforcing cage diameter and making should meet designing requirement, whole fabrication of reinforcing cage, lifting, or sectional making, every segment length 5000 ~ 9000mm, then Site Welding, should stagger 500mm in main muscle welding position, weld at same position every a main muscle side, welding point adopts the two-sided or single-sided welding of side bar, or adopts gas pressure welding or mechanical connection, within the scope of joint 1000mm, stirrup spacing is 100mm, stirrup spiral bar;
(3) lengthways main steel bar bind round spot welding and fixes with putting more energy into, and spacing is evenly equal, and stirrup adopts helically from coil to coil and the main muscle colligation of disk raw material, encloses at interval of 10 road hoops and main muscle spot welding one, and first binds round and close circle with last level of binding round into;
(4) protective layer thickness of main muscle generally should not be less than 50mm, and reinforcing cage, when installation in position, is transferred while hang concrete protective layer pad, to guarantee thickness of concrete cover;
(5) during install reinforcing cage, mating holes position, directly hang to hold up and surely, slowly sink, collision free hole wall, accurate to ensure reinforcing cage position; When reinforcing cage is put into design attitude, to does fixing reliably immediately, preventing when watering pier core concrete, occur sinking or skew;
(6) reinforcing cage install after, Party A, management, construction, quality inspection must be had, inspect for acceptance hidden after, can next procedure be carried out;
G, pier core concrete water, and comprise following steps:
(1) when pier hole is dug to design elevation, do not answer ponding at the bottom of hole, whole Kong Houying has cleared up residue, ponding at the bottom of mud on retaining wall and hole, then subsurface work acceptance is carried out, after acceptance(check), should water bottom concrete immediately, bottom concrete at least should be poured into the above 200mm of end face at reaming position;
(2) should build pier shaft concrete immediately after watering bottom concrete, slump during concreting is preferably 8 ~ 10cm; Concrete discharging adopts tumbling barrel, and tumbling barrel is not more than 2m apart from concrete placings face, and concrete answers continuous stratification to water, and every layer of pouring height must not more than 1.0m; Layering tamping, appropriate to the occasion fast inserting of vibrating is pulled out slowly, in the middle of after first periphery, spacing of vibrating 200 ~ 300mm, general control vibrating time 30s;
(3) pier shaft concrete once completes, and does not stay constuction joint, in case of have a power failure or mechanical breakdown cause pouring cannot carry out time, and the constuction joint formed, treat that concrete strength reaches more than 1.2Mpa, surface cutter remove loosening stone and laitance, after rinsing well again placing of concrete until Dun Ding; Expose the anchorage length of steel bar of 640mm to ensure that upper part work can carry out smoothly; Smear before concrete initial set and flatten, avoid occurring plastic shrinkage cracks or hoop shrinkage crack;
(4) pier shaft concrete must leave test specimen, and every root pier should have one group of test block, and each cast machine-team must not be less than one group, often organizes three;
(5), before building pier core concrete, need application concreting order, after obtaining instruction, can construct;
H, super pier top design elevation complete pier operation
When concrete is poured into pier top, suitably should exceed pier top design elevation 5 ~ 10cm, to ensure that pier top mark is high meets designing requirement, and the post joint bar on Dun Ding should ensure design size, vertically inserts after rejecting laitance.
Major diameter artificial digging pedestal pier foundation construction method of the present invention can also be further achieved by the following technical measures.
Aforesaid method, in wherein said step c, the allowable variation of pier hole drilling construction: pier footpath deviation ± 50mm; Perpendicularity deviation 0.5%; The biased difference of pier (referring to that single pier bar shaped pier base is along the abutment pier in vertical axis direction and group's pier foundation).
Aforesaid method, in wherein said step f, the allowable variation of fabrication of reinforcing cage: main muscle spacing ± 10mm; Stirrup spacing or spiral bar pitch ± 20mm; Reinforcing cage diameter ± 10mm; Length of reinforcing cage ± 50mm.
Aforesaid method, in wherein said step f, the protective layer thickness allowable variation of the main muscle of reinforcing cage is not more than ± 10mm.
After adopting technique scheme, major diameter artificial digging pedestal pier foundation construction method of the present invention has the following advantages:
1, area of base calculates by the method for designing of natural ground, eliminates single pier load test;
2, construction safety reliable, ensure construction speed and good engineering quality;
3, reduce engineering cost, bottom-enlarging pier foundation cost saves more than 20% than other base forms.
Accompanying drawing explanation
Fig. 1 is that the basic plane of the embodiment of the present invention is arranged;
Fig. 2 is the pier shaft schematic diagram of the embodiment of the present invention;
Fig. 3 is the dado structure schematic diagram of the embodiment of the present invention;
Fig. 4 is the pier heart cross section type schematic diagram of the embodiment of the present invention;
Fig. 5 is the pier cap floor map of the embodiment of the present invention;
Fig. 6 is the A-A sectional view in Fig. 5.
In figure: 1 cushion cap, 2 design pier top marks are high, and 3 put more energy into hoop, 4 spiral stirrups, and 5 indulge muscle, bearing stratum at the bottom of 6 piers, 7 breast wall concretes, muscle indulged by 8 retaining walls, 9 retaining wall distribution bars, 10 frame column joint bars, 11 the 1st pier cap stirrups, 12 the 2nd pier cap stirrups, 13 the 3rd pier cap stirrups, 14 bed courses, 15 pier bases.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing thereof, the present invention is illustrated further.
Embodiment 1
Now refer to Fig. 1, Fig. 1 is that Pingtan standardization school of the comprehensive test region second phase middle and primary schools project experimental primary school building project basic plane of the embodiment of the present invention is arranged.Major diameter artificial digging pedestal pier foundation construction method of the present invention, is characterized in that comprising the following steps:
A, preparation of construction
Be familiar with construction drawing, engineering geology, hydrologic condition data and underground utilities situation; By every technical data of the clear and definite pier foundation of design drawing requirement; Work out practicable each step working measure; Carry out comprehensive safety technics to constructor before excavation to tell somebody what one's real intentions are; Before operation, safe and reliable inspection and test are carried out to suspender, guarantee construction safety; Reinforcing cage is performed by designing requirement division system;
B, surveying setting-out
The Surveying control achievement provided according to Construction unit and the network for location of artificial digging pedestal pier, total powerstation is adopted to measure each axial control network and height datum point, determining Dun Wei center, take mid point as the center of circle, adds dado thickness for radius draw the circumference of top (i.e. the first step) with pier shaft radius.Lime line as pier hole excavation dimension line.After hole bit line is reserved, must check through relevant department, excavate after ruing preliminary examination formality well.The position of running check pier in construction, guarantee that pier position is correct, table 1 is pier base parameter table (see Fig. 2).
Table 1 pier base parameter table
Wherein: d=pier core diameter
L=pier length
Diameter at butt end at the bottom of D=pier
Large grease head highness at the bottom of h1=pier
At the bottom of h2=pier, major part is to the cone height of retaining wall
L1=length of reinforcing cage
C, pore-forming excavation and spoir, comprise following steps:
(1) borehole is by manual operation, successively excavates from top to bottom, rear perimeter edge first, first dark rear shallow, often saves digging depth 1000mm, after upper strata retaining wall concrete just tool intensity, dig under can continuing under normal geological environment.Shoveling order is first middle rear perimeter edge, effectively controls the sectional dimension in excavation pier hole.
(2) borehole pier unearthed 0.5t, 3KW mobile lift loop wheel machine, well-bucket volume is 0.1m3, and be equipped with lifting cranes 30 altogether, 30, well-bucket, 2 people's operation groups on average joined by every platform elevator.Duan Autumn, short pick is adopted, convenient operation during borehole.Carry native bucket and do not want overfill, hurt sb.'s feelings in case soil block or stone drop.Be transported to heap heatable adobe sleeping platform place with trolley after the earthwork goes out well to stack, well head is forbidden to leave remaining mud, to alleviate the pressure around pier hole.The soil dug out in hole is done rehandling, namely utilizes outside 1 excavator and 6 dump trucks and be transported to spoil ground.Have during underground water and take with well-bucket, muddy water to be hung out with digging.A large amount of infiltration, digs sump in side, discharges outside pier hole with submersible pump.
(3) expand bottom part and first dig cylinder, after repair from top to bottom expand be shaped, reamer pitch cone body lateral face and horizontal plane inclination angle must not be greater than 45 °, to guarantee soil stabilization, the bottom of a pan is spherical crown curved surface, notice in digging process that the physical dimension at each position meets designing requirement, dig while measure, find that deviation is revised in time.
(4) borehole is by native rock layers, carries out original record respectively, and gets and stay rock sample, preserves as geologic information, and (air-supply is greater than 1.5m to be equipped with submersible pump and blast fan
3/ min).6Kg/cm during nose embedding weathered rock formation
2air compressor air feed, use pneumatic pick rock drilling.Whole hole after every bar pier will reach designing requirement by units concerned's qualification.
(5) in pier hole, operating personnel will wear a safety helmet, and ground handling operator will fasten safety belt.When well-bucket leaves 1.5m above aperture, promote activity safety cover plate, shelter aperture, prevent the foreign material such as soil block, stone unloading soil from falling in hole and hurt sb.'s feelings.After well-bucket unloads soil in small handcart, then open removable cover, transfer well-bucket dress soil.
(6) pier hole is dug to prescribed depth, checks diameter and the borehole wall circular arc degree in pier hole with a pricker, vertically smooth-going up and down, finishing hole wall.
In described step c, the allowable variation of pier hole drilling construction: pier footpath deviation ± 50mm; Perpendicularity deviation 0.5%; The biased difference of pier (referring to that single pier bar shaped pier base is along the abutment pier in vertical axis direction and group's pier foundation).
D, hole pier breast wall concrete pouring construction method, comprise following steps:
(1) dado template adopts arc-shaped steel template, is connected and fixed with buckle, often saves dado template assembled by four pieces of punching blocks, for ease of form removal, can spell mouth place lay a wedge shape wood a tree, used in making timber for boats at one.The assembled shaping physical dimension of dado template should meet designing requirement.
(2) template periphery and middle adopt 5cm plank be sawn into template inside the circular arc that matches, be circumferentially divided into four pieces, overlapping stickfast is carried out horizontal enclosure and is fixed, and the upper and lower twice of every mould are arranged, and prevent internal mold to be out of shape because of tension.Horizontal support is not established for convenience of operation.
(3) first segment retaining wall length is 1000mm, and end face should exceed 200mm than place, is convenient to gear soil, dash, after first segment form removable, second section retaining wall pouring concrete, all will demarcate at first segment retaining wall suitable for reading by pier position axis and elevation.
(4) concrete guard wall and the borehole borehole wall in conjunction with firmly, should separately can squeeze into the reinforcing bar of hole wall length 1000mm φ 16mm if desired, and to prevent retaining wall from gliding, unit in charge of construction can propose change scheme in conjunction with concrete condition, and confirms through designing unit.
(5) pore-forming shoveling is poured into retaining wall and is hocketed, often to save as a construction circulation (namely dug after often saving soil and then watered a joint concrete guard wall), retaining wall often saves General Requirements height 1000mm, the lap length of upper and lower joint retaining wall concrete must not be less than 100mm, the height often saving retaining wall in weaker soil layer should reduce 500mm, depending on security situation, and with digging, with testing, with pouring concrete.
(6) breast wall concrete adopts concrete chute from foundation ditch transports under foundation ditch or directly uses transported in hand truck fashion.When building breast wall concrete, with reinforcing bar, concrete vibrating is closely knit.
(7) breast wall concrete must ensure closely knit; Dado template adopts and tears joint open, a lower joint repeats turnover and uses, and dado template is removed and should be carried out at 24 hours later, when finding that retaining wall has honeycomb, an infiltration phenomenon, should reinforcement in time in case cause the accident.
(8) in order to ensure the verticality of pier, require often to have watered three joint retaining walls, palpus check pier center and verticality are once.
The whole hole construction of e, middle decomposed rock, comprises following steps:
(1) bearing stratum inspection
Pier hole is dug to design elevation at the bottom of hole, following core at the bottom of hole or soil sample friendship relevant department's (prospecting, design, management, Party A, quality supervision etc.) personal appraisal should be drilled through, when qualification reaches design bearing stratum, carry out relative recording in time, reaming at the bottom of hole can be carried out, enlarged footing size detail drawing paper.Dig enlarged footing and first dig pile body cylinder, then accomplish expansion end shape and the dark rock degree of depth from top to bottom.
(2) whole hole is checked and accepted
Pore-forming Hou Dun center, verticality, enter the rock degree of depth, and pier Bottom Shape and enlarged footing physical dimension will reach designing requirement, organized checked and accepted by Party A, management, construction, design, surveying unit, takes out rock sample whole hole after qualification reaches designing requirement at the bottom of pier.
F, pier reinforcing cage are constructed, and comprise following steps:
(1) reinforcing cage makes shaping at the construction field (site), and reinforcing cage clips and main muscle adopt spot-welded firm.
(2) reinforcing cage diameter and making should meet designing requirement, have ready conditions appropriate to the occasion whole and make lifting, also sectional makes, and every segment length is 9000mm, then Site Welding, should stagger 500mm in main muscle welding position, can weld at same position every a main muscle, welding point can adopt the two-sided or single-sided welding of side bar, also can adopt gas pressure welding or mechanical connection, within the scope of joint 1000mm, stirrup spacing is 100mm, and stirrup preferentially should adopt spiral bar.
(3) lengthways main steel bar bind round spot welding and fixes with putting more energy into, and spacing is evenly equal, and helically from coil to coil and the main muscle colligation of stirrup employing disk raw material, encloses at interval of 10 road hoops and main muscle spot welding one.First hoop closes circle with last level of binding round into.
(4) protective layer thickness of main muscle generally should not be less than 50mm, and reinforcing cage, when installation in position, is transferred while hang concrete protective layer pad, to guarantee thickness of concrete cover.
(5) during install reinforcing cage, mating holes position, directly hang to hold up and surely, slowly sink, collision free hole wall, accurate to ensure reinforcing cage position.When reinforcing cage is put into design attitude, to does fixing reliably immediately, preventing when watering pier core concrete, occur sinking or skew.
(6) reinforcing cage install after, Party A, management, construction, quality inspection must be had, inspect for acceptance hidden after, can next procedure be carried out.
In described step f, the allowable variation of fabrication of reinforcing cage: main muscle spacing ± 10mm; Stirrup spacing or spiral bar pitch ± 20mm; Reinforcing cage diameter ± 10mm; Length of reinforcing cage ± 50mm; The protective layer thickness allowable variation of the main muscle of reinforcing cage is not more than ± 10mm.
G, pier core concrete water, and comprise following steps:
(1) when pier hole is dug to design elevation, do not answer ponding at the bottom of hole, whole Kong Houying has cleared up residue, ponding at the bottom of mud on retaining wall and hole, then subsurface work acceptance is carried out, after acceptance(check), should water bottom concrete immediately, bottom concrete at least should be poured into the above 200mm of end face at reaming position.
(2) pier shaft concrete should be built immediately after watering bottom concrete.Slump during concreting is preferably 10cm.Concrete discharging adopts tumbling barrel, and tumbling barrel is not more than 2m apart from concrete placings face, and concrete answers continuous stratification to water, and every layer of pouring height must not more than 1.0m.Layering tamping, appropriate to the occasion fast inserting of vibrating is pulled out slowly, and in the middle of after first periphery, vibrate spacing 300mm, general control vibrating time 30s.
Fig. 2 is the pier shaft schematic diagram of the embodiment of the present invention, and Fig. 3 is the dado structure schematic diagram of the embodiment of the present invention.
(3) pier shaft concrete should once complete in principle, does not stay constuction joint, in case of have a power failure or mechanical breakdown cause pouring cannot carry out time, and the constuction joint formed, treat that concrete strength reaches more than 1.2Mpa, surface cutter remove loosening stone and laitance, after rinsing well again placing of concrete until Dun Ding.Expose the anchorage length of steel bar of 640mm to ensure that upper part work can carry out smoothly.Smear before concrete initial set and flatten, avoid occurring plastic shrinkage cracks or hoop shrinkage crack.
(4) pier shaft concrete must leave test specimen, and every root pier should have one group of test block, and each cast machine-team must not be less than one group (often organizing three).
(5), before building pier core concrete, need application concreting order, after obtaining instruction, can construct.
Fig. 4 is the pier heart cross section type schematic diagram of the embodiment of the present invention.
H, super pier top design elevation complete pier operation
Fig. 5 is the pier cap floor map of the embodiment of the present invention, and Fig. 6 is the A-A sectional view in Fig. 5.
When concrete is poured into pier top, suitably should exceed pier top design elevation 10cm, to ensure that pier top mark is high meets designing requirement, and the post joint bar on Dun Ding should ensure design size, vertically inserts after rejecting laitance.
The present invention has substantive distinguishing features and significant technological progress, major diameter artificial digging pedestal pier foundation construction method of the present invention uses in Pingtan standardization school of comprehensive test region second phase middle and primary schools project experimental primary school building project, Be very effective, obtains the abundant affirmation of exploiting entity, supervisor and Construction unit.
Above embodiment is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, can also make various conversion or change.Therefore, all equivalent technical schemes also should belong to category of the present invention, should be limited by each claim.
Claims (4)
1. a major diameter artificial digging pedestal pier foundation construction method, is characterized in that comprising the following steps:
A, preparation of construction
Be familiar with construction drawing, engineering geology, hydrologic condition data and underground utilities situation; By every technical data of the clear and definite pier foundation of design drawing requirement; Reinforcing cage is performed by designing requirement division system;
B, surveying setting-out
The Surveying control achievement provided according to Construction unit and the network for location of artificial digging pedestal pier, each axial control network and height datum point is measured with total powerstation, determining Dun Wei center, take mid point as the center of circle, adds dado thickness for radius draw the circumference on top with pier shaft radius;
C, pore-forming excavation and spoir, comprise following steps:
(1) borehole is by manual operation, successively excavates from top to bottom, rear perimeter edge first, first dark rear shallow, often saves digging depth 1000mm, after upper strata retaining wall concrete just tool intensity, dig under continuation under normal geological environment;
(2) borehole pier unearthed 0.5t, 3KW mobile lift loop wheel machine, well-bucket volume is 0.1m
3;
(3) expand bottom part first dig cylinder, after repair from top to bottom expand be shaped, reamer pitch cone body lateral face and horizontal plane inclination angle≤45 °;
(4) borehole is by native rock layers, carries out original record respectively, and gets and stay rock sample, preserves as geologic information, and is equipped with submersible pump and draws water and blast fan air-supply, air output > 1.5m
3/ min; 6Kg/cm during nose embedding weathered rock formation
2air compressor air feed, use pneumatic pick rock drilling;
(5) when well-bucket leaves 1.5m above aperture, promote activity safety cover plate, shelter aperture, prevent from unloading the soil block of soil, stone foreign material fall in hole and hurt sb.'s feelings;
(6) pier hole is dug to prescribed depth, checks diameter and the borehole wall circular arc degree in pier hole with a pricker, vertically smooth-going up and down, finishing hole wall;
D, hole pier breast wall concrete are built, and comprise following steps:
(1) dado template adopts arc-shaped steel template, is connected and fixed with buckle, often saves dado template assembled by four pieces of punching blocks;
(2) template periphery and middle adopt 5cm plank be sawn into template inside the circular arc that matches, be circumferentially divided into four pieces, overlapping stickfast is carried out horizontal enclosure and is fixed, and the upper and lower twice of every mould are arranged;
(3) first segment retaining wall length answers >=1000mm, and end face exceeds 150 ~ 200mm than place, all will demarcate at first segment retaining wall suitable for reading by pier position axis and elevation;
(4) concrete guard wall and the borehole borehole wall in conjunction with firmly, should separately squeeze into the reinforcing bar of hole wall length 1000mm, diameter 16mm if desired;
(5) pore-forming shoveling is poured into retaining wall and is hocketed, and often to save as a construction circulation, retaining wall often saves General Requirements height 1000mm, the lap length >=100mm of upper and lower joint retaining wall concrete;
(6) breast wall concrete adopts concrete chute from foundation ditch transports under foundation ditch or directly uses transported in hand truck fashion, when building breast wall concrete, with reinforcing bar, concrete vibrating is closely knit;
(7) breast wall concrete must ensure closely knit; Dado template adopts and tears joint open, a lower joint repeats turnover and uses, and dado template is removed and should be carried out at 24 hours later;
(8) in order to ensure the verticality of pier, require often to have watered three joint retaining walls, palpus check pier center and verticality are once;
The whole hole construction of e, middle decomposed rock, comprises following steps:
(1) bearing stratum inspection
Pier hole is dug to design elevation at the bottom of hole, drills through following core at the bottom of hole or soil sample friendship relevant personnel qualification, when qualification reaches design bearing stratum, carry out relative recording in time, carry out reaming at the bottom of hole, dig enlarged footing and first dig pile body cylinder, then accomplish expansion end shape and the dark rock degree of depth from top to bottom;
(2) whole hole is checked and accepted
Pore-forming Hou Dun center, verticality, enter the rock degree of depth, and pier Bottom Shape and enlarged footing physical dimension will reach designing requirement, organized checked and accepted by Party A, management, construction, design, surveying unit, takes out rock sample whole hole after qualification reaches designing requirement at the bottom of pier;
F, pier reinforcing cage are constructed, and comprise following steps:
(1) reinforcing cage makes shaping at the construction field (site), and reinforcing cage clips and main muscle adopt spot-welded firm;
(2) reinforcing cage diameter and making should meet designing requirement, whole fabrication of reinforcing cage, lifting, or sectional making, every segment length 5000 ~ 9000mm, then Site Welding, should stagger 500mm in main muscle welding position, weld at same position every a main muscle side, welding point adopts the two-sided or single-sided welding of side bar, or adopts gas pressure welding or mechanical connection, within the scope of joint 1000mm, stirrup spacing is 100mm, stirrup spiral bar;
(3) lengthways main steel bar bind round spot welding and fixes with putting more energy into, and spacing is evenly equal, and helically from coil to coil and the main muscle colligation of stirrup employing disk raw material, encloses at interval of 10 road hoops and main muscle spot welding one; First hoop closes circle with last level of binding round into;
(4) protective layer thickness of main muscle generally should not be less than 50mm, and reinforcing cage, when installation in position, is transferred while hang concrete protective layer pad, to guarantee thickness of concrete cover;
(5) during install reinforcing cage, mating holes position, directly hang to hold up and surely, slowly sink, collision free hole wall, accurate to ensure reinforcing cage position; When reinforcing cage is put into design attitude, to does fixing reliably immediately, preventing when watering pier core concrete, occur sinking or skew;
(6) reinforcing cage install after, Party A, management, construction, quality inspection must be had, inspect for acceptance hidden after, can next procedure be carried out;
G, pier core concrete water, and comprise following steps:
(1) when pier hole is dug to design elevation, do not answer ponding at the bottom of hole, whole Kong Houying has cleared up residue, ponding at the bottom of mud on retaining wall and hole, then subsurface work acceptance is carried out, after acceptance(check), should water bottom concrete immediately, bottom concrete at least should be poured into the above 200mm of end face at reaming position;
(2) pier shaft concrete should be built immediately after watering bottom concrete;
Slump during concreting is preferably 8 ~ 10cm;
Concrete discharging adopts tumbling barrel, and tumbling barrel is not more than 2m apart from concrete placings face, and concrete answers continuous stratification to water, and every layer of pouring height must not more than 1.0m; Layering tamping, appropriate to the occasion fast inserting of vibrating is pulled out slowly, in the middle of after first periphery, spacing of vibrating 200 ~ 300mm, general control vibrating time 30s;
(3) pier shaft concrete once completes, and does not stay constuction joint, in case of have a power failure or mechanical breakdown cause pouring cannot carry out time, and the constuction joint formed, treat that concrete strength reaches more than 1.2Mpa, surface cutter remove loosening stone and laitance, after rinsing well again placing of concrete until Dun Ding; Expose the anchorage length of steel bar of 640mm to ensure that upper part work can carry out smoothly; Smear before concrete initial set and flatten, avoid occurring plastic shrinkage cracks or hoop shrinkage crack;
(4) pier shaft concrete must leave test specimen, and every root pier should have one group of test block, and each cast machine-team must not be less than one group, often organizes three;
(5), before building pier core concrete, need application concreting order, after obtaining instruction, can construct;
H, super pier top design elevation complete pier operation
When concrete is poured into pier top, suitably should exceed pier top design elevation 5 ~ 10cm, to ensure that pier top mark is high meets designing requirement, and the post joint bar on Dun Ding should ensure design size, vertically inserts after rejecting laitance.
2. major diameter artificial digging pedestal pier foundation construction method as claimed in claim 1, is characterized in that, in described step c, and the allowable variation of pier hole drilling construction: pier footpath deviation ± 50mm; Perpendicularity deviation 0.5%; The biased difference of pier (referring to that single pier bar shaped pier base is along the abutment pier in vertical axis direction and group's pier foundation).
3. major diameter artificial digging pedestal pier foundation construction method as claimed in claim 1, is characterized in that, in described step f, and the allowable variation of fabrication of reinforcing cage: main muscle spacing ± 10mm; Stirrup spacing or spiral bar pitch ± 20mm; Reinforcing cage diameter ± 10mm; Length of reinforcing cage ± 50mm.
4. major diameter artificial digging pedestal pier foundation construction method as claimed in claim 1, it is characterized in that, in described step f, the protective layer thickness allowable variation of the main muscle of reinforcing cage is not more than ± 10mm.
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| CN108517876A (en) * | 2018-04-18 | 2018-09-11 | 中国建筑第八工程局有限公司 | Pattern foundation pit supporting structure means for mounting coupling parts and its construction method |
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| CN108517876A (en) * | 2018-04-18 | 2018-09-11 | 中国建筑第八工程局有限公司 | Pattern foundation pit supporting structure means for mounting coupling parts and its construction method |
| CN109629455A (en) * | 2019-02-27 | 2019-04-16 | 中交路桥北方工程有限公司 | The construction method of highway reconstruction bridge |
| CN112281842A (en) * | 2020-10-22 | 2021-01-29 | 陈远 | Construction method of static pressure pipe pile |
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