CN101864763A - Foundation integrated processing construction method of cover type karst area - Google Patents
Foundation integrated processing construction method of cover type karst area Download PDFInfo
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- CN101864763A CN101864763A CN 201010190331 CN201010190331A CN101864763A CN 101864763 A CN101864763 A CN 101864763A CN 201010190331 CN201010190331 CN 201010190331 CN 201010190331 A CN201010190331 A CN 201010190331A CN 101864763 A CN101864763 A CN 101864763A
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Abstract
The invention relates to a foundation processing method, in particular to a foundation integrated processing construction method of a cover type karst area. The method comprises the following steps of: evacuating earth moving machinery when a foundation pit is excavated until a limestone formation is exposed in a large area; basically exposing rocks of the bottom of the foundation pit after excavating, wherein rock buds are exposed from a foundation base, and the storage quantity of damic earth among the rock buds does not influence the next procedure construction; adopting weakened loose blasting operation, aiming at solution cracks, intermountain gulches and locally crushing bedrocks, and mechanically crushing and clearing; adopting a complex geophysical prospecting technological means that a high-density resistivity method is combined with a geological radar, arranging a high-density electrical geophysical prospecting wire in a construction site according to an arrangement rule, meanwhile, arranging a detailed exploratory hole in a building planning position, and mechanically picking the solution cracks, the intermountain gulches and the locally crushing bedrocks; adopting sleeve valve cement flour and coal ash slurry injecting constriction and cement flour and coal ash slurry filling constriction by a solution cavity slurry-injection method; and filling and casting concrete. The invention can quicken a work progress and can save construction cost compared with other foundation processing modes.
Description
Technical field
The present invention relates to method for processing foundation, especially a kind of foundation integrated processing construction method of cover type karst area.
Background technology
At present, domestic many construction enterprises handle ground and did corresponding research, also obtain certain successful experience.But still none enterprise or a project so far, the expert that can make up prospecting, design, construction and geology aspect effectively studies together, so far can't obtain new breakthrough aspect the foundation treatment technology of karst area, on cover type karst area, launch to change the experience of filling out the integrated treatment construction, also do not have relevant construction technology and can use for reference.
Summary of the invention
How the present invention is intended to solve under the prerequisite of control construction investment, guarantees the Foundation Design quality, guarantees programming, and a kind of foundation integrated processing construction method of cover type karst area is provided.
For achieving the above object, this job practices is carried out according to the following step:
(1) discloses excavation construction: when excavation of foundation pit exposes to the lime rock stratum large tracts of land, withdraw from earth moving plant; Foundation ditch bottom, excavation back reaches rock and exposes substantially, and clint exposes substrate, and the admaic earth amount retained does not influence the next procedure construction and gets final product between clint;
(2) explosion and machinery cut cleaning: blasting method is adopted and is weakened loosening blasting, at solution crack and intermountain coombe and local broken basement rock, takes the Mechanical Crushing cleaning;
(3) the complex geophysical prospecting technological means of taking high-density electric to combine with geological radar: high-density electric is by layout rules high-density electric physical prospecting line to be set in the building site, in proposed building location arrangements detailed exploration hole, machinery cuts at solution crack and intermountain coombe and local broken basement rock simultaneously;
(4) slip casting of solution cavity is handled: the solution cavity grouting method adopts sleeve valve cementing coal ash pulp construction and the construction of cement injection fly-ash mortar;
(5) plain concrete is filled and is built.
The present invention makes up by effectively explosion and machinery being cut, the complex geophysical prospecting technology that high-density electric and geological radar combine, accelerated programming greatly, more single foundation treatment mode can be constructed respectively, take practicable processing mode, played the purpose of saving construction fund.
Outstanding effect of the present invention is: accelerated programming, saved construction fund with respect to other foundation treatment modes, handling for ground of the same type provides beneficial reference and reference.
The specific embodiment
Below in conjunction with specific embodiment in detail invention is described in detail:
One, discloses excavation construction
Described this place landform of present embodiment is comparatively smooth, and geomorphic type is single, and earth formation is complicated, and Geological Conditions of Environmental Engineering is simpler, is easy to regulation, belongs to the less stable place.Soil property is not really even, ground is more stable, underground water is less to effect of project, the bedrock relief bigger to the engineering construction influence is bigger, drainage condition still can, construction than the appropriate architecture thing, but limit by Systems of Red Line in Planning Based and site operation road, carry out natural discharging slope and may cause and close on enclosure wall or road caves in.So must do soil nailing wall bank protection around the part building foundation ditch, all foundation ditches are put sloping coefficient by 1: 0.3.Because cutting depth does not reach the underground water absolute altitude, behind the excavation of foundation pit, does not consider the stability influence of underground water to foundation ditch.
When excavation of foundation pit exposes to the lime rock stratum large tracts of land, withdraw from earth moving plant; Foundation ditch bottom, excavation back reaches rock and exposes substantially, and clint exposes substrate, and the admaic earth amount retained does not influence the next procedure construction and gets final product between clint.
Two, explosion and machinery cut cleaning
A, blasting method and type
Blasting method is adopted and to be weakened loosening blasting, and blasting action index n gets about 0.5, and the sillar that reaches after the explosion is loose substantially, available machinery shipment.
B, machinery cut
Adopt machinery to cut cleaning.At solution crack and intermountain coombe and local broken basement rock, take the Mechanical Crushing cleaning at the explosion scene.
Three, take the technological means of the complex geophysical prospecting that high-density electric combines with geological radar
The utilization of a, high-density electric
According to the areal geology data, the place belongs to karst and grows the district, and development degree is not quite clear.So this prospecting is arranged in on-site and has arranged 21 high-density electric physical prospecting lines, simultaneously in the proposed building location arrangements detailed exploration hole, the exploratory hole data is both as general house prospecting data, again as the checking hole of place karst.
In addition, in 258 probing holes that on-site is arranged altogether, main along planning to build the thing periphery.It is identical substantially that the stratum, place reflected, these 258 probing holes and high-density electric are reconnoitred the result, the performance of karst corrosion district in boring that high-density electric reflected mainly is that rock mass is broken shape, little solution crack is grown, the solution crack of the overwhelming majority is the admaic earth institute filling of plastic-soft-plastic state, the solution cavity that differs in size has been found in indivedual probings hole, plan-position and hole body size can be determined substantially, for next step processing provides advantageous conditions.
The utilization of b, ground penetrating radar detection method
For growth, the distribution situation of grasping this geology karst more accurately, and take the control measures of corresponding economical rationality, accumulate experience for surveying similar many solution cavities geology simultaneously, engineering has selected for use SIR-2 type ground penetrating radar that this geology is surveyed more meticulously.
Four, the slip casting of solution cavity is handled
A, the construction of sleeve valve cementing coal ash pulp
1) arranges boring:, and carry out mark at every pile periphery reasonable Arrangement injected hole.
2) drilling construction: adopt XY2100 type rig, diameter is that 91mm or 110mm drill bit mud off creep into, and conscientiously observes drilling process, further understands fully filling situation in hole body developmental state and the hole.
3) following sleeve valve pipe: sleeve valve pipe is divided into floral tube and real pipe two parts, highly is equipped with floral tube according to slip casting, pours into clear water in the following Guan Shiguan and overcomes buoyancy, makes under the floral tube at the bottom of the hole, and the length of floral tube is higher than hole top board 50cm at least.For sleeve valve injected hole, the valve pipe of will and tucking inside the sleeve at present behind the pore-forming will be built sleeve shell material behind the following sleeve valve pipe, and solid again pipe ends slurry.
4) slip casting: according to the sequencing of pore-forming, treat that sleeve shell material has (being generally 1d) after certain intensity, with the slip casting steel pipes of 4 fens two plugs of band from the sleeve valve down to the slip casting position, segmenting slip casting from bottom to top, sector boss 0.5m-1.0m.
In the slip casting process, should observe adjacent injected hole exhaust, return water, emit situation such as slurry, if around the hole have slurries to emerge, should stop cement-grouting consolidation.Again slip casting behind the 12h.
If around not reaction of injected hole, and grouting amount is excessive and when surpassing the volume of itself, should adopt " intermittently quantitatively branchs preface slip casting method " to carry out slip casting, and is excessive with the loss of control injection slurry.
B, the construction of cement injection fly-ash mortar
1) slurries match ratio: cement: sand: flyash: clay: water=1: 3: 2: 0.4: 2.
2) slip casting: adopt extrusion pump composite mortar directly to be injected soil cave, solution cavity from holing by sleeve valve pipe, the valve cementing coal ash pulp of tucking inside the sleeve again, the fixed hole of secondary filling body top board, base plate be the closely knit position of filling not, carries out necessary additional reinforcing, makes the hole body form closely knit integral body.
3) irritate the whole filling standard of mortar: guarantee that ground does not produce crack and protuberance, under the grouting pressure of 0.6MPa～0.8MPa, the pump amount is less than 1L/min～2L/min, voltage stabilizing 15min.
Five, plain concrete is filled and is built
The basis is filled building of concrete by in time organizing test slot of foundation after explosion and the cleaning after check of foundation subsoil is qualified, strengthens vibrating.
Claims (4)
1. foundation integrated processing construction method of cover type karst area, undertaken by following step:
(1) discloses excavation construction: when excavation of foundation pit exposes to the lime rock stratum large tracts of land, withdraw from earth moving plant; Foundation ditch bottom, excavation back reaches rock and exposes substantially, and clint exposes substrate, and the admaic earth amount retained does not influence the next procedure construction and gets final product between clint;
(2) explosion and machinery cut cleaning: blasting method is adopted and is weakened loosening blasting, at solution crack and intermountain coombe and local broken basement rock, takes the Mechanical Crushing cleaning;
(3) the complex geophysical prospecting technological means of taking high-density electric to combine with geological radar: high-density electric is by layout rules high-density electric physical prospecting line to be set in the building site, in proposed building location arrangements detailed exploration hole, machinery cuts at solution crack and intermountain coombe and local broken basement rock simultaneously;
(4) slip casting of solution cavity is handled: the solution cavity grouting method adopts sleeve valve cementing coal ash pulp construction and the construction of cement injection fly-ash mortar;
(5) plain concrete is filled and is built.
2. foundation integrated processing construction method of cover type karst area according to claim 1 is characterized in that, the blasting action index n in the above-mentioned steps (2) gets about 0.5.
3. foundation integrated processing construction method of cover type karst area according to claim 1 is characterized in that, the concrete grammar of the described sleeve valve of above-mentioned steps (4) cementing coal ash pulp construction is:
1) arranges boring:, and carry out mark at every pile periphery reasonable Arrangement injected hole;
2) drilling construction: adopt XY2100 type rig, diameter is that 91mm or 110mm drill bit mud off creep into, and conscientiously observes drilling process, further understands fully filling situation in hole body developmental state and the hole;
3) following sleeve valve pipe: sleeve valve pipe is divided into floral tube and real pipe two parts, highly is equipped with floral tube according to slip casting, pours into clear water in the following Guan Shiguan and overcomes buoyancy, makes under the floral tube at the bottom of the hole, and the length of floral tube is higher than hole top board 50cm at least.For sleeve valve injected hole, the valve pipe of will and tucking inside the sleeve at present behind the pore-forming will be built sleeve shell material behind the following sleeve valve pipe, and solid again pipe ends slurry;
4) slip casting: according to the sequencing of pore-forming, treat that sleeve shell material has (being generally 1d) after certain intensity, with the slip casting steel pipes of 4 fens two plugs of band from the sleeve valve down to the slip casting position, segmenting slip casting from bottom to top, sector boss 0.5m-1.0m.
4. foundation integrated processing construction method of cover type karst area according to claim 1 is characterized in that, the concrete grammar of the described coal ash mortar construction of above-mentioned steps (4) is:
1) slurries match ratio: cement: sand: flyash: clay: water=1: 3: 2: 0.4: 2;
2) slip casting: adopt extrusion pump composite mortar directly to be injected soil cave, solution cavity from holing by sleeve valve pipe, the valve cementing coal ash pulp of tucking inside the sleeve again, the fixed hole of secondary filling body top board, base plate be the closely knit position of filling not, carries out necessary additional reinforcing, makes the hole body form closely knit integral body;
3) irritate the whole filling standard of mortar: guarantee that ground does not produce crack and protuberance, under the grouting pressure of 0.6MPa～0.8MPa, the pump amount is less than 1L/min～2L/min, voltage stabilizing 15min.
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102162255A (en) * | 2011-04-07 | 2011-08-24 | 西安建筑科技大学 | Method for reinforcing existing pile foundation in collapsed loess area by slip casting |
| CN102660952A (en) * | 2012-05-30 | 2012-09-12 | 湖南宏禹水利水电岩土工程有限公司 | Controllable clay paste slurry grouting technique |
| CN102877884A (en) * | 2012-09-13 | 2013-01-16 | 山东能源集团有限公司 | Method for modification and construction of top of Ordovician limestone of mine based on kilometer directional drilling technique |
| CN102979087A (en) * | 2012-12-21 | 2013-03-20 | 中铁二局股份有限公司 | Construction method for rotary excavation pile |
| CN104278667A (en) * | 2013-07-02 | 2015-01-14 | 浙江国泰建设集团有限公司 | Underground karst cave filling treatment method |
| CN104360046A (en) * | 2014-11-06 | 2015-02-18 | 水利部交通运输部国家能源局南京水利科学研究院 | Comprehensive geophysical-prospecting combined diagnosis method for hidden danger inside wharf concrete structure |
| CN105627843A (en) * | 2014-11-27 | 2016-06-01 | 华北冶建工程建设有限公司 | New method for blasting rock foundation |
| CN106088165A (en) * | 2016-06-13 | 2016-11-09 | 贵州正业工程技术投资有限公司 | A kind of karst area basement bottom board Anti-floating design method |
| CN106284315A (en) * | 2016-09-22 | 2017-01-04 | 河北建设勘察研究院有限公司 | A kind of bored pile construction method through solution cavity |
| CN106285636A (en) * | 2016-08-29 | 2017-01-04 | 上海交通大学 | In karst strata, shield tunnel solution cavity along the line filling grouting amount determines method |
| CN106400825A (en) * | 2016-09-06 | 2017-02-15 | 中铁二十四局集团南昌铁路工程有限公司 | Method for protecting water level in historic ancient well during water plugging in strong karst water-rich region |
| CN106517954A (en) * | 2016-11-17 | 2017-03-22 | 中南大学 | Jacket material used for controllable grouting of shield tunnel underwater karst, and preparation method thereof |
| CN107905218A (en) * | 2017-11-28 | 2018-04-13 | 中国冶集团有限公司 | A kind of karst cave treatment method in the construction applied to Pile In Drill In Karst Terrain |
| CN108487229A (en) * | 2018-03-28 | 2018-09-04 | 贵州省地质矿产勘查开发局111地质大队 | Artificial pore-forming method after strong rock-soluble foundation pre-grouting treatment |
| CN109024569A (en) * | 2018-08-22 | 2018-12-18 | 中国建筑第四工程局有限公司 | A kind of beading solution cavity pretreatment construction method |
| CN112302014A (en) * | 2020-10-26 | 2021-02-02 | 中建四局第一建筑工程有限公司 | Construction method for reinforcing H-shaped steel bottom karst cave of pile in SMW construction method |
| CN112982051A (en) * | 2021-02-20 | 2021-06-18 | 温俊魁 | Roadbed suitable for karst landform and construction method |
| CN113374465A (en) * | 2021-06-08 | 2021-09-10 | 浙江数智交院科技股份有限公司 | Covering type karst vertical striping method and device and electronic equipment |
| CN114814977A (en) * | 2022-03-01 | 2022-07-29 | 山东大学 | Method for local accurate investigation of structural plane and weak part of soil-rock double-element foundation pit slope rock mass |
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| CN102162255B (en) * | 2011-04-07 | 2012-09-26 | 西安建筑科技大学 | Method for reinforcing existing pile foundation in collapsed loess area by slip casting |
| CN102162255A (en) * | 2011-04-07 | 2011-08-24 | 西安建筑科技大学 | Method for reinforcing existing pile foundation in collapsed loess area by slip casting |
| CN102660952A (en) * | 2012-05-30 | 2012-09-12 | 湖南宏禹水利水电岩土工程有限公司 | Controllable clay paste slurry grouting technique |
| CN102660952B (en) * | 2012-05-30 | 2014-07-23 | 湖南宏禹水利水电岩土工程有限公司 | Controllable clay paste slurry grouting technique |
| CN102877884B (en) * | 2012-09-13 | 2016-03-16 | 山东能源集团有限公司 | The difficult to understand grey top transformation of a kind of mine based on km directional drilling technology and construction method |
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| CN106400825B (en) * | 2016-09-06 | 2018-06-08 | 中铁二十四局集团南昌铁路工程有限公司 | To the guard method of historical relic Gu Well Water Level during a kind of strong rich water karst area sealing |
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| CN107905218A (en) * | 2017-11-28 | 2018-04-13 | 中国冶集团有限公司 | A kind of karst cave treatment method in the construction applied to Pile In Drill In Karst Terrain |
| CN108487229A (en) * | 2018-03-28 | 2018-09-04 | 贵州省地质矿产勘查开发局111地质大队 | Artificial pore-forming method after strong rock-soluble foundation pre-grouting treatment |
| CN109024569A (en) * | 2018-08-22 | 2018-12-18 | 中国建筑第四工程局有限公司 | A kind of beading solution cavity pretreatment construction method |
| CN112302014A (en) * | 2020-10-26 | 2021-02-02 | 中建四局第一建筑工程有限公司 | Construction method for reinforcing H-shaped steel bottom karst cave of pile in SMW construction method |
| CN112982051A (en) * | 2021-02-20 | 2021-06-18 | 温俊魁 | Roadbed suitable for karst landform and construction method |
| CN112982051B (en) * | 2021-02-20 | 2024-04-26 | 温俊魁 | Roadbed suitable for karst landform and construction method |
| CN113374465A (en) * | 2021-06-08 | 2021-09-10 | 浙江数智交院科技股份有限公司 | Covering type karst vertical striping method and device and electronic equipment |
| CN114814977A (en) * | 2022-03-01 | 2022-07-29 | 山东大学 | Method for local accurate investigation of structural plane and weak part of soil-rock double-element foundation pit slope rock mass |
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