CN101311418A - Exchange filling method for deep-foundation pit and large area equipment foundation - Google Patents
Exchange filling method for deep-foundation pit and large area equipment foundation Download PDFInfo
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- CN101311418A CN101311418A CNA2007100413150A CN200710041315A CN101311418A CN 101311418 A CN101311418 A CN 101311418A CN A2007100413150 A CNA2007100413150 A CN A2007100413150A CN 200710041315 A CN200710041315 A CN 200710041315A CN 101311418 A CN101311418 A CN 101311418A
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Abstract
The invention relates to a foundation bed landfill, in particular to a method for displacing deep foundation pit and large-scale equipment foundation, comprising the following steps: preparation, the replaced fillings are determined and the construction mechanism is selected according to the construction conditions, and the ground foundation is dug to be the design level; the times of compaction is determined; the thickness of each pavement and the times of compaction is are determined according to different replacement fillings and replacement thicknesses; the underground water level is reduced; the underground water level is reduced to below the replacement level to guarantee no water on the replaced surface; layered pavement and roller compaction are carried out; according to the times of compaction and thickness of each pavement which are determined by the second step, layered landfill of replaced material and roller compaction are carried out till the most top forms replacement foundation bed, and each roller compacted surface has no obvious pressure marks with even and smooth surface and no waves and pigs; the replaced foundation bed surface is processed; after the replacing, the construction of the concrete cushion is immediately carried out to ensure the quality of the replaced foundation bed. The invention effectively improves the foundation bed bearing capacity, reduces the sedimentation of the foundation bed base and ensures the stability and security of engineering.
Description
Technical field
The present invention relates to foundation bed landfill, relate in particular to a kind of foundation bed landfill method of deep foundation ditch large tracts of land Equipment Foundations.
Background technology
Foundation settlement problem in industry and the civilian construction field is quite general quality problems, and it has caused the discontented of many users and has complained in recent years, is one of maximum technical barrier that perplexs at present numerous engineers and technicians.The control measure that adopt mainly are that prestressed high-strength concrete pile (PHC stake), concrete square pile, cast-in-place concrete pile, steel pipe pile, CFG (CFG stake) etc. are set both at home and abroad; The most frequently used is to be designed to PHC stake or cast-in-place concrete pile, but has often increased a large amount of design difficulty and economic investment to building operations.
Summary of the invention
The present invention is intended to solve the described defective of background technology, and a kind of deep foundation ditch, large tracts of land Equipment Foundations exchange filling method are provided.The present invention effectively improves bearing capacity of foundation soil, reduces the sedimentation of foundation, has guaranteed the stability and the degree of safety of engineering.
The present invention is achieved in that a kind of deep foundation ditch, large tracts of land Equipment Foundations exchange filling method, comprises following each step:
Step 1, prepare: determine to change filler, select construction machinery according to execution conditions, and digging at the bottom of the foundation to design elevation;
Step 2, determine compacting counting: according to different change filler and change fill out thickness and determine every layer of laying depth and compacting counting;
Step 3, dewatering: dewatering is filled out below the absolute altitude to changing, and guarantees that changing the face of filling out does not have open fire;
Step 4, layering is laid and is rolled:
According to compacting counting and every layer of laying depth that step 2 is determined, the layering landfill changes filler and rolls, and forms up to last layer and changes the made ground base, and each layer rolls landfill surface and should reach no obvious impression, and surfacing is smooth, no wave and hollow shape;
Step 5 is changed the made ground primary surface and is handled: changes after completing and will carry out the construction of concrete cushion, the quality of guaranteeing to change the made ground base immediately.
Described deep foundation ditch, large tracts of land Equipment Foundations exchange filling method, the filler of described step 1 is for selecting grating sand gravel or graded broken stone preferably, and mud content is not more than 8%, does not contain organic matter; Clod, frozen soil clod diameter are less than 100mm; Described construction machinery is large-scale rolling compaction machine or rammer.
Described deep foundation ditch, large tracts of land Equipment Foundations exchange filling method, the number of rolling that described step 2 is determined is 3-8 time.
Described deep foundation ditch, large tracts of land Equipment Foundations exchange filling method, described step 3, the mode of dewatering can adopt well-points dewatering or big well precipitation, the bright draining of employing that the basis is more shallow.
Described deep foundation ditch, large tracts of land Equipment Foundations exchange filling method, described step 4 comprises:
Transport vehicle discharging outside the hole;
When rolling, a roller to press a roller, avoid leaving the space and leak and press; The method that first floor need not vibrate rolls, and avoids occurring the spongy soil phenomenon;
The record number of rolling is consistent the whole number of rolling that changes filler;
If wave or hollow shape are arranged after rolling, adopt artificial cooperation that the shop fines is filled out at the low-lying place of wave and hollow place and continue to roll till smooth;
Carry out and connect a batch step, every layer batch width that connects must not be less than 500-1000mm, every layer change filler roll finish after, remove the loosening filler that changes of joint part.
Described deep foundation ditch, large tracts of land Equipment Foundations exchange filling method, described step 4 also need be controlled every layer of absolute altitude, measures coefficient of consolidation with check compacting real density by burying sand point method simultaneously, after meeting the demands, descends the laying of one deck immediately; The coefficient of consolidation that does not reach designing requirement continues to roll, till the coefficient of consolidation that reaches designing requirement.
Described deep foundation ditch, large tracts of land Equipment Foundations exchange filling method, described bury sand point method measure coefficient of consolidation tie up to bury sand point when filler is changed in laying, preassigned area be 1/1000m2 the zone in grain diameter is imbedded at 5～8% following yellow ground smaller or equal to 5mm, moisture content, with to change the sand gravel laying depth filled out slightly high and carry out on request and change filler and roll in the lump, behind the pass that rolls regulation, carry out its coefficient of consolidation of inspection by sampling with cutting ring.
Described deep foundation ditch, large tracts of land Equipment Foundations exchange filling method if when having little time the placing of concrete bed course, needed the same day ground after exchange is filled out to protect, prevent that rainwater from soaking summer in the described step 5, prevent from winter to change enduring cold of made ground face and freeze.
The present invention does not have PHC stake, concrete square pile, cast-in-place concrete pile, steel pipe pile, CFG stake, and no special material and other special measure can effectively improve bearing capacity of foundation soil, reduces the sedimentation of foundation, has guaranteed the stability and the degree of safety of engineering.Method of the present invention meets domestic design commonly used at present, construction technology and execution conditions, not only saves construction investment, convenient construction greatly, has also guaranteed the globality and the durability of structure, produces for modernization industry and creates good environment.For the large equipment base engineering that has a large capacity and a wide range, provide practicable ground to change to fill out control method and measure from theory into action, economic benefit, social benefit are huge, have a extensive future.
The specific embodiment
Below, in conjunction with the practice of construction step, further specify the present invention:
(1) dewatering
Change fill out before, earlier groundwater table is reduced to change and fills out absolute altitude (11.885m) 500mm down, changing the face of filling out does not have open fire, if changing the face of filling out has open fire, after open fire must being got rid of, just can change and fill out, and avoids producing foundation bottom and the spongy soil phenomenon occurs when rolling.The mode of dewatering can adopt well-points dewatering, big well precipitation, and what the basis was more shallow can adopt bright draining;
(2), raw material are selected
1, change the raw material of filling out construction, select according to the actual conditions of locality, grating sand gravel or graded broken stone are preferably selected in the area of raw material wide material sources as far as possible;
2, change the raw material of filling out construction, mud content generally must not be changed in the filler and must not contain organic matter greater than 8%, as: plant ash, weeds leaf, tree root etc.;
3, change and to contain the clod of diameter in the filler, more will avoid its content especially in the winter time greater than the frozen soil clod of 100mm greater than 100mm;
4, when selecting to change filler, at first want designing requirement to purchase, in the time of can't meeting design requirement in the locality,, after meeting design requirement, solicit design, management and owner's suggestion, purchase after the agreement through quality inspection according to the resource situation of locality;
(3), change the control of packing material size
The particle diameter that changes filler is big and little, and the good of grating directly has influence on the quality of changing the made ground base with bad, and for this reason, the particle diameter of exchange filler carries out strictness control:
1, changes filler D
MaxShould be controlled at 1/3 of backfill thickness, and should be less than 200mm, its content must not surpass 10%; The particle diameter of D/2 should be controlled at 30～50%; Mud content≤8%;
2, every enter foundation ditch change the stone of packing material size greater than 200mm, must remove or carry out hand breaking, roll quality otherwise will influence to change to fill out;
3, change and forbid to sneak into the soil block of particle diameter in the filler, if in changing the process of filling out, find to have the clod of diameter greater than 100mm, the one, artificial removing, the 2nd, cobbing greater than 100mm;
4, carry out ground in the teletostage and change when filling out, the one, prevent that changing filler is frozen into bulk, everyly be frozen into crushing with machinery when filling out or temporarily go out clearly changing of piece, use again after waiting to thaw;
(4), press the selection of (rammer) real machine tool
Change and fill out thickness and determine to press (rammers) real machine tool according to changing size, the basis of filling out the foundation ditch area, generally the foundation ditch area is bigger, can be in foundation ditch walking machine, select big machinery to roll as far as possible, if the foundation ditch area is less, be not easy to machine-walking, can adopt rammer to tamp.The area of this worker method construction is bigger, so adopt cal rolling.
(5), compacting counting determines
formally change fill out before, will be to the used simulation field compaction test that filler carries out site operation of changing, because different change filler, different changing filled out thickness, the pass that rolls (compacting) had bigger difference, and (compacting) equipment that rolls that adopts is also had bigger difference.The rolling apparatus that this worker method adopts is the oscillating mode road roller.Actual conditions according to the scene roll, and the road roller that this project is used is 14t, roll through examination, determine that the pass that rolls must not be less than six times.But, be according to the geological condition of locality, often changing when filling out first floor, because the ground water content is bigger, be easy to generate the rubber phenomenon when adopting vibroroller cmpacting, when first floor changes filler and rolls, without the method for vibroroller cmpacting, other layer adopts the method for vibroroller cmpacting as far as possible.Static pressure is adopted in suggestion, increase number of rolling according to compaction, in the process of rolling, to keep rolling a stone roller, do not allow to leave the space, anti-leak-stopping is pressed, and observes at any time and rolls situation, often will guarantee that the wheel load in the process of rolling does not have tangible impression, change that to fill out the face of rolling smooth smooth, guarantee the rammed subgrade quality of changing filler.
(6), the check of coefficient of consolidation
Change the quality quality of made ground base, directly have influence on the bearing capacity of ground, the quality that filler is changed in check, the way of being taked is to change the coefficient of consolidation of filler.The method that the filling compaction coefficient is changed in this construction check is to adopt the sand point method of burying, the area that buries sand point is 1/1000m2, when filler is changed in laying, to screen out greater than the particle diameter particle more than the 5mm in the yellow ground, its moisture content is controlled at 5～8% yellow ground and is embedded in preassigned position, with to change the sand gravel laying depth filled out slightly high and carry out on request and change filler and roll in the lump, behind the pass that rolls regulation, carry out its coefficient of consolidation of inspection by sampling with cutting ring, after meeting the demands, descend the laying of one deck immediately; The coefficient of consolidation that does not reach designing requirement continues to roll, till the coefficient of consolidation that reaches designing requirement.Coefficient of consolidation carries out verification of synchronization at the scene by the detection unit that qualification is arranged, and the guidance scene is changed and filled out construction at any time, guarantees to change the matrix amount.
(7), layering, roll and connect the stubble requirement
1, installs the meter absolute altitude digging at the bottom of the foundation earlier, after the common check of foundation subsoil of design, geological mapping, management and owner is qualified, can organize to change and fill out construction;
2, according to changing the degree of depth of filling out the basis, the facility that compacting is selected, determine every layer laying depth, the every layer thickness of the laying depth of this worker method is 500mm ± 50mm; If when selecting other pressure (rammer) real machine tool, laying depth will be through determining after the on-the-spot actual tests;
3, large-scale foundation ditch first floor changes and fills out when laying, and the one, transport vehicle directly can not be reached in the hole and tiltedly expect; The 2nd, the first floor method with vibration not rolls, and avoids occurring the spongy soil phenomenon;
4, every layer is changed filler when laying, avoid directly entering discharging in the hole with haulage truck, preventing truck rolls the back and lays inhomogeneous and the matrix amount is changed in influence, when filler is changed in laying, will lay with backhoe or loader, keep every layer of laying depth unanimity, it is smooth that filling surface is changed in laying, compactness basically identical after rolling, guarantee Equipment Foundations the bearing capacity basically identical, when sedimentation takes place, also be consistent substantially;
5, change filler when rolling, want a roller to press a roller, must not leave the space and leak and press, when rolling, have the special messenger to command, the record number of rolling, the whole number of rolling that changes filler is consistent, since pass reaches when rolling simultaneously, but impression is comparatively obvious, also to continue to roll, keep rolling no obvious impression.Surfacing is smooth, and no wave and hollow shape if after rolling wave or hollow shape are arranged, adopt artificial cooperation that the shop fines is filled out at the low-lying place of wave and hollow place and continue to roll till smooth;
When 6, changing the made ground base, often roll bad at joint part, change when filling out at foundation pit, carry out and connect a batch step, every layer batch width that connects must not be less than 500-1000mm, every layer change filler roll finish after, the loosening filler that changes of joint part is removed, batch position keeps being through grinding compacting for connecing of being stayed, and prevents that joint part from rolling not in place and influence integral body and change the matrix amount; Change to fill out and connect stubble schematic diagram 2 as follows:
7, when laying joint part, that is laid changes filler and will select, and joint part changes the building stones that must not contain in the filler above 100mm, prevents to roll when rolling, and influences consolidation effect.
(8), the control of every layer of absolute altitude
Every layer roll finish after, be through manage checking and accepting, the project of examination is an absolute altitude after the compacting of coefficient of consolidation, every layer virtual resurfacing thickness and every layer, is convenient to grasp and understand the compacting compactness.
(9), changing the made ground primary surface handles
Ground change filling out the construction finish after, in time carry out the construction of concrete cushion, the sealing change the made ground foundation base, reduce artificial causing and change the damage of made ground primary surface and influence the quality of changing the made ground base.If when having little time the placing of concrete bed course, the ground after exchange is filled out is protected, and prevents that rainwater from soaking summer, prevents from winter to change enduring cold of made ground face and freezes, influences the quality of changing the made ground base; Carry out sand gravel in the winter time and change when filling out, every layer is changed and fills out in the time of can not constructing continuously after the end, fill out the surface layer that rolls and protects changing, and preventing to freeze influences second day construction.Change after completing and to carry out the construction of concrete cushion, the quality of guaranteeing to change the made ground base immediately.
Claims (8)
1. a deep foundation ditch, large tracts of land Equipment Foundations exchange filling method is characterized in that it comprises following each step:
Step 1, prepare: determine to change filler, select construction machinery according to execution conditions, and digging at the bottom of the foundation to design elevation;
Step 2, determine compacting counting: according to different change filler and change fill out thickness and determine every layer of laying depth and compacting counting;
Step 3, dewatering: dewatering is filled out below the absolute altitude to changing, and guarantees that changing the face of filling out does not have open fire;
Step 4, layering is laid and is rolled:
According to compacting counting and every layer of laying depth that step 2 is determined, the layering landfill changes filler and rolls, and forms up to last layer and changes the made ground base, and each layer rolls landfill surface and should reach no obvious impression, and surfacing is smooth, no wave and hollow shape;
Step 5 is changed the made ground primary surface and is handled: changes after completing and will carry out the construction of concrete cushion, the quality of guaranteeing to change the made ground base immediately.
2. deep foundation ditch according to claim 1, large tracts of land Equipment Foundations exchange filling method is characterized in that, the filler of described step 1 is for selecting grating sand gravel or graded broken stone preferably, and mud content is not more than 8%, does not contain organic matter; Clod, frozen soil clod diameter are less than 100mm; Described construction machinery is large-scale rolling compaction machine or rammer.
3. deep foundation ditch according to claim 1, large tracts of land Equipment Foundations exchange filling method is characterized in that, the number of rolling that described step 2 is determined is 3-8 time.
4. deep foundation ditch according to claim 1, large tracts of land Equipment Foundations exchange filling method is characterized in that, described step 3, the mode of dewatering can adopt well-points dewatering or big well precipitation, the bright draining of employing that the basis is more shallow.
5. deep foundation ditch according to claim 1, large tracts of land Equipment Foundations exchange filling method is characterized in that described step 4 comprises:
Transport vehicle discharging outside the hole;
When rolling, a roller to press a roller, avoid leaving the space and leak and press; The method that first floor need not vibrate rolls, and avoids occurring the spongy soil phenomenon;
The record number of rolling is consistent the whole number of rolling that changes filler;
If wave or hollow shape are arranged after rolling, adopt artificial cooperation that the shop fines is filled out at the low-lying place of wave and hollow place and continue to roll till smooth;
Carry out and connect a batch step, every layer batch width that connects must not be less than 500 1 1000mm, every layer change filler roll finish after, remove the loosening filler that changes of joint part.
6. deep foundation ditch, large tracts of land Equipment Foundations exchange filling method according to claim 1 or 5, it is characterized in that described step 4 also need be controlled every layer of absolute altitude, measure coefficient of consolidation with check compacting real density by burying sand point method simultaneously, after meeting the demands, descend the laying of one deck immediately; The coefficient of consolidation that does not reach designing requirement continues to roll, till the coefficient of consolidation that reaches designing requirement.
7. deep foundation ditch according to claim 6, large tracts of land Equipment Foundations exchange filling method is characterized in that, described bury sand point method measure coefficient of consolidation tie up to bury sand point when filler is changed in laying, be 1/1000m at preassigned area
2The zone in grain diameter is imbedded at 5～8% following yellow ground smaller or equal to 5mm, moisture content, with to change the sand gravel laying depth filled out slightly high and carry out on request and change filler and roll in the lump, behind the pass that rolls regulation, carry out its coefficient of consolidation of inspection by sampling with cutting ring.
8. deep foundation ditch according to claim 1, large tracts of land Equipment Foundations exchange filling method; it is characterized in that, in the described step 5 if when having little time the placing of concrete bed course, needed the same day ground after exchange is filled out to protect; prevent that rainwater from soaking summer, prevent from winter to change enduring cold of made ground face and freeze.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100413150A CN101311418A (en) | 2007-05-25 | 2007-05-25 | Exchange filling method for deep-foundation pit and large area equipment foundation |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100413150A CN101311418A (en) | 2007-05-25 | 2007-05-25 | Exchange filling method for deep-foundation pit and large area equipment foundation |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974898A (en) * | 2010-11-03 | 2011-02-16 | 成都四海岩土工程有限公司 | Roller compacted concrete cushion changing and filling method |
| CN102518111A (en) * | 2011-11-15 | 2012-06-27 | 攀钢集团工程技术有限公司 | Blast furnace slag replacement method for high-fill steel slag foundation |
| CN104963349A (en) * | 2015-06-30 | 2015-10-07 | 南通理工学院 | Construction method for backfilling of underground foundation pit excavation soil |
| CN105568806A (en) * | 2015-12-28 | 2016-05-11 | 上海建工一建集团有限公司 | Control method of large-area, large-load terrace differential settlement |
| CN107268625A (en) * | 2017-07-02 | 2017-10-20 | 中亿丰建设集团股份有限公司 | A kind of pile sinking construction method of deep jackstone badness geological province |
| CN108193663A (en) * | 2018-01-24 | 2018-06-22 | 浙江立鹏建设有限公司 | The foundation stabilization equipment that the processing method and this method of deep foundation base are formed |
| CN108677911A (en) * | 2018-05-11 | 2018-10-19 | 杭州永创基建工程科技股份有限公司 | A kind of processing method of modular soil body pressing formation device and soft soil foundation |
| CN110344420A (en) * | 2019-07-30 | 2019-10-18 | 北京首钢建设集团有限公司 | It constructs after first backfill in a kind of lowered zones the method on basis |
| CN111980051A (en) * | 2020-07-30 | 2020-11-24 | 上海二十冶建设有限公司 | C-shaped stock ground rigid composite foundation construction method |
| CN114016493A (en) * | 2021-09-23 | 2022-02-08 | 中国化学工程重型机械化有限公司 | Soft foundation replacement construction method |
| CN114277762A (en) * | 2021-12-29 | 2022-04-05 | 中国一冶集团有限公司 | Foundation treatment method for vibration control of power machine foundation |
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2007
- 2007-05-25 CN CNA2007100413150A patent/CN101311418A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974898A (en) * | 2010-11-03 | 2011-02-16 | 成都四海岩土工程有限公司 | Roller compacted concrete cushion changing and filling method |
| CN101974898B (en) * | 2010-11-03 | 2011-12-14 | 成都四海岩土工程有限公司 | Roller compacted concrete cushion changing and filling method |
| CN102518111A (en) * | 2011-11-15 | 2012-06-27 | 攀钢集团工程技术有限公司 | Blast furnace slag replacement method for high-fill steel slag foundation |
| CN102518111B (en) * | 2011-11-15 | 2014-05-21 | 攀钢集团工程技术有限公司 | Blast furnace slag replacement method for high-fill steel slag foundation |
| CN104963349A (en) * | 2015-06-30 | 2015-10-07 | 南通理工学院 | Construction method for backfilling of underground foundation pit excavation soil |
| CN105568806A (en) * | 2015-12-28 | 2016-05-11 | 上海建工一建集团有限公司 | Control method of large-area, large-load terrace differential settlement |
| CN107268625A (en) * | 2017-07-02 | 2017-10-20 | 中亿丰建设集团股份有限公司 | A kind of pile sinking construction method of deep jackstone badness geological province |
| CN108193663A (en) * | 2018-01-24 | 2018-06-22 | 浙江立鹏建设有限公司 | The foundation stabilization equipment that the processing method and this method of deep foundation base are formed |
| CN108677911A (en) * | 2018-05-11 | 2018-10-19 | 杭州永创基建工程科技股份有限公司 | A kind of processing method of modular soil body pressing formation device and soft soil foundation |
| CN110344420A (en) * | 2019-07-30 | 2019-10-18 | 北京首钢建设集团有限公司 | It constructs after first backfill in a kind of lowered zones the method on basis |
| CN111980051A (en) * | 2020-07-30 | 2020-11-24 | 上海二十冶建设有限公司 | C-shaped stock ground rigid composite foundation construction method |
| CN114016493A (en) * | 2021-09-23 | 2022-02-08 | 中国化学工程重型机械化有限公司 | Soft foundation replacement construction method |
| CN114016493B (en) * | 2021-09-23 | 2023-09-12 | 中国化学工程重型机械化有限公司 | Soft foundation reclamation construction method |
| CN114277762A (en) * | 2021-12-29 | 2022-04-05 | 中国一冶集团有限公司 | Foundation treatment method for vibration control of power machine foundation |
| CN114277762B (en) * | 2021-12-29 | 2023-10-27 | 中国一冶集团有限公司 | Foundation treatment method for foundation vibration control of power machine |
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Inventor after: Zhang Xiangbao Inventor after: Cao Tieyu Inventor after: Huang Dianhu Inventor after: Zhang Tianya Inventor after: Liu Peiwen Inventor after: Li Zhefeng Inventor after: Jia Fayong Inventor before: Zhang Xiangbao Inventor before: Cao Tieyu Inventor before: Huang Dianhu Inventor before: Zhang Tianya Inventor before: Liu Peiwen Inventor before: Li Zhefeng Inventor before: Jia Fayong |
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Open date: 20081126 |