CN110453678A - A kind of method of high-pressure rotary jet grouting pile double pipe ruling by law reason highway in loess area sedimentation - Google Patents
A kind of method of high-pressure rotary jet grouting pile double pipe ruling by law reason highway in loess area sedimentation Download PDFInfo
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- CN110453678A CN110453678A CN201910694810.4A CN201910694810A CN110453678A CN 110453678 A CN110453678 A CN 110453678A CN 201910694810 A CN201910694810 A CN 201910694810A CN 110453678 A CN110453678 A CN 110453678A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- Mining & Mineral Resources (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Architecture (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention belongs to subgrade settlement Treatment process fields, a kind of method for ruling reason highway in loess area sedimentation by law more particularly to high-pressure rotary jet grouting pile double pipe, including preparation of construction, specific construction parameter is determined by test pile and the setting-out of stake position, aperture operation is carried out to the point of stake position setting-out, then slurrying, intubation and whitewashing, and pile crown is handled, the present invention can make the soil body and cement slurry sufficiently mix solidification, later period pile is the soil cement cylinder pile of diameter 60-150cm, pile is good, meet weak subgrade, mutual compacted occlusion between cement earth pile, weak subgrade can be made to be consolidated into an entirety, the differential subsidence that this method is mainly used in Highway in Loess Area roadbed is administered, embankment and subjacent bed can be administered, subgrade settlement caused by roadbed weakness can thoroughly be administered.
Description
Technical field
The invention belongs to subgrade settlement Treatment process fields, and in particular to a kind of high-pressure rotary jet grouting pile double pipe ruling by law reason loess
The method of highway subgrade sedimentation.
Background technique
The presence of collapsibility of loess, the consolidation settlement of loess, the mutation of different section geological condition or different sections of highway
The method for processing foundation to differ greatly is taken, so that the section sedimentation of features as poor geologic condition is big, and the sedimentation of other sections is small, generates
Differential subsidence especially builds the highways at different levels in Canal in Loess Area after the several years that is open to traffic, and this differential subsidence gradually accumulates
Tired, often there is irregular depression in road surface, serious jump vehicle phenomenon occurs, and the jump vehicle as caused by Uneven road generates
Impact force the irregularity degree on road surface can be made to be further exacerbated by, formed vicious circle.Highway protect it is smooth due to, for
This ground subsidence management often only overlays base and surface layer, can not eradicate to the most fundamental reason is settled.
In recent years, high-pressure rotary jet grouting pile administers the biggish subgrade defect of highway subgrade differential subsidence.In northwest China loess
For area, high-pressure rotary jet grouting pile substance tube method expanded diameter is smaller, generally less than 50cm, when pilespacing is certain, Ge Geshui
Occlusion can not be formed between soil stake, weak roadbed can not be connected into an entirety, regulation effect is undesirable.When diminution stake
Away from when, stake digit is near to reduce and doubles above, and construction period and project cost will substantially increase.Since Canal in Loess Area loess is anti-
Shear ability is weak, when using the construction of high-pressure rotary jet grouting pile tri-tube method, since tri-tube method pressure is larger, administers tight on the outside of roadbed
When the roadbed of adjacent side slope part, high pressure water mud is easy to break through side slope, causes secondary disease to roadbed.
Summary of the invention
For above-mentioned problems of the prior art and deficiency, the present invention provides a kind of high-pressure rotary jet grouting pile double pipe ruling by law
The method for managing highway in loess area sedimentation.
To achieve the above object, the invention provides the following technical scheme:
A kind of method of high-pressure rotary jet grouting pile double pipe ruling by law reason highway in loess area sedimentation, this method carry out as steps described below:
Step 1: after Area Of Safe Operation laying is finished, the roadbed side slope for treating improvement is reconnoitred, and discovery side slope, which exists, to be fallen into
When cave or longer through crack, simultaneously consolidation process is recorded in time, can carry out high-pressure rotary jet grouting pile work after consolidation process
Industry；
Step 2: treating the initial measurement of higher degree of road surface laying elevation observation point progress for administering roadbed, lay the side of elevation observation point
Formula is along the longitudinal 3 × 3m rectangular arrangement of route, work progress, and per half a day carries out a measurement of higher degree, according to road hump feelings
Condition adjusts grouting pressure in time, and to prevent, design requirement is not achieved in road surface raising height deficiency or raising height is excessively high causes road
Face cracking；
Step 3: the setting-out of stake position is carried out by construction drawing, when administering Bridgehead by Blastig sedimentation, the position of the first campshed position cross central line
For the position of abutment parados 1/2 diameter backward, when setting-out, should be according to expansion joint center line in bridge original design drawing and abutment parados
The distance between, the first campshed position cross central line is calculated at a distance from expansion joint, and stake position cross central line is vertical with route always
To vertical, after determining the first campshed position center line, the setting-out of stake position is carried out by design pilespacing, pile layout form and stake digit；
When administering general subgrade sedimentation, found out first according to the sedimentation combination design drawing of median strip corrugated guardrail or kerbstone
The maximum position of settling amount, then carries out precise measurement with level, determines its position center line, then settles feelings according to two sides
Condition carries out the setting-out of stake position；
Step 4: after setting-out, carrying out aperture operation with drilling machine, slurrying and bore operation are carried out after aperture；
Step 5: preparing cement slurry according to the determining ratio of mud of design, when carrying out slurrying operation, water is added according to the ratio of mud first
The dosage of mud and water, Xian Jiashui stir 5min with pulper afterwards plus cement, and qualified to every disk cement slurry specific gravity self-test is laggard
Enter drilling and intubation process；
Step 6: when double tube method Construction of High Pressure Jet Grouting Pile, drilling and intubation two procedures be combined into one, before drilling, drilling machine by
Horizontal ruler is strictly leveled from both direction in length and breadth, and verticality must not exceed 1.5%；
Step 7: shotcrete pipe sinks after arrival projected depth, stops drilling, and rotation does not stop, and the increasing of high-pressure slurry pump pressure is set to construction
Evaluation, air compressor machine pressure remain unchanged, side whitewashing, Bian Xuanzhuan, while being promoted and being bored according to the promotion speed that design and test pile determine
Bar, after whirl spraying is completed in whole stake, after confirming that slip casting machine and air compressor machine are closed, ability dismounting drilling rod carries out next pile body construction；
Step 8: after entire work surface whitewashing terminates, for drilling machine according to former stake position aperture again, aperture depth is road surface structare layer
Depth uses C20 concrete backfill after aperture；
Step 9: after construction, by strong to high-pressure rotary jet grouting pile pile body drilling core examination high-pressure rotary jet grouting pile pile body uniaxial compressive
Degree and Bearing Capacity of Composite Foundation, high-pressure rotary jet grouting pile pile body uniaxial compressive strength and Bearing Capacity of Composite Foundation should meet design requirement.
Further, the calculation method that the amount of cement slurry is prepared in the step 5 is volumetric method, wherein volumetric method are as follows:
(1)
In (1) formula, Q is the whitewashing amount (m needed3)；
DeFor whirl spraying induration diameter (m)；
D0For slip casting pipe diameter (m)；
K1For filling rate, 0.75~0.9；
h1For whirl spraying length (m)；
K2For the filling rate of non-whirl spraying range soil, 0.5~0.75；
h2For non-whirl spraying length (m)；
β is loss coefficient, 0.1~0.2；
By statistical analysis, discovery is long when stake, and cement slurry dosage is smaller, on the basis of volumetric method, utilizes Excel table
Data fitting is carried out, fits and is suitable for the calculation formula of Canal in Loess Area high-pressure rotary jet grouting pile cement slurry dosage
(2)
(2) in formula, Q is the whitewashing amount (m needed3)；
D is whirl spraying induration diameter (m)；
K is filling rate, 0.75~0.9；
H is that stake is long (m)；
β is loss coefficient, 0.1~0.2；
X is the long influence coefficient of stake；
It can be obtained by above formula (2), cement slurry dosage continues to use the formula of original soft clay area construction, it is clear that does not meet practical feelings
Condition, formula (2) show that being conducive to the finer controlled investment of owner's unit and unit in charge of construction carries out cost control and construction
The control of quality.
Compared with prior art, the beneficial effects of the present invention are:
Cement grout is passed through drilling rod end using high-pressure grout injector using high-pressure rotary jet grouting pile double tube method construction system by the present invention
Less than 0.2mm spray head, the soil body is sprayed into not less than 25MPa pressure so that high speed is horizontal, by the impact force cross cutting of cement grout
Soil layer, while drilling rod is promoted slowly with the speed low speed of 15-20cm/min on one side, is made with the speed low speed rotation of 16-20rpm
The soil body and cement slurry sufficiently mix solidification, and later period pile is the soil cement cylinder pile of diameter 60-150cm, and pile is good, meet weak
Roadbed, mutually compacted occlusion, can make weak subgrade be consolidated into an entirety, this method is mainly used in loess between cement earth pile
The differential subsidence of local highway roadbed can administer embankment and subjacent bed, can thoroughly administer roadbed weakness and cause on administering
Subgrade settlement.
Detailed description of the invention
Fig. 1 is process flow diagram of the invention；
Fig. 2 is the long influence coefficient of stake and the long relational graph of stake.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1 and 2, a kind of method of high-pressure rotary jet grouting pile double pipe ruling by law reason highway in loess area sedimentation, the party
Method carries out as steps described below:
Step 1: after Area Of Safe Operation laying is finished, the roadbed side slope for treating improvement is reconnoitred, and discovery side slope, which exists, to be fallen into
When cave or longer through crack, simultaneously consolidation process is recorded in time, can carry out high-pressure rotary jet grouting pile work after consolidation process
Industry；
Step 2: treating the initial measurement of higher degree of road surface laying elevation observation point progress for administering roadbed, lay the side of elevation observation point
Formula is along the longitudinal 3 × 3m rectangular arrangement of route, work progress, and per half a day carries out a measurement of higher degree, according to road hump feelings
Condition adjusts grouting pressure in time, and to prevent, design requirement is not achieved in road surface raising height deficiency or raising height is excessively high causes road
Face cracking；
Step 3: the setting-out of stake position is carried out by construction drawing, when administering Bridgehead by Blastig sedimentation, the position of the first campshed position cross central line
For the position of abutment parados 1/2 diameter backward, when setting-out, should be according to expansion joint center line in bridge original design drawing and abutment parados
The distance between, the first campshed position cross central line is calculated at a distance from expansion joint, and stake position cross central line is vertical with route always
To vertical, after determining the first campshed position center line, the setting-out of stake position is carried out by design pilespacing, pile layout form and stake digit；
When administering general subgrade sedimentation, found out first according to the sedimentation combination design drawing of median strip corrugated guardrail or kerbstone
The maximum position of settling amount, then carries out precise measurement with level, determines its position center line, then settles feelings according to two sides
Condition carries out the setting-out of stake position；
Step 4: according to the point of the stake position setting-out in step 3, carrying out aperture operation with drilling machine, after drill bit centering, drilling machine is tight
Style is flat, and perforation of boring machine depth is pavement structure layer depth, carries out water-proofing treatment to all pilot holes after aperture, packed using working out
Aperture material blocks aperture, to spray operation after drilling；
Step 5: preparing cement slurry according to the determining ratio of mud of design, when carrying out slurrying operation, water is added according to the ratio of mud first
The dosage of mud and water, Xian Jiashui stir 5min with pulper afterwards plus cement, and qualified to every disk cement slurry specific gravity self-test is laggard
Enter drilling and intubation process；
Step 6: when double tube method Construction of High Pressure Jet Grouting Pile, drilling and intubation two procedures be combined into one, before drilling, drilling machine by
Horizontal ruler is strictly leveled from both direction in length and breadth, and verticality is no more than 1.5%, can be by injection since roadbed soil compaction is higher
Manage itself injection or vibration injection, injection or vibration penetration process are as follows: starting drilling machine, while opening high pressure cement stock pump low pressure
Cement grout is conveyed, air compressor machine is opened, its pressure is made to be maintained at 0.5-0.7Mpa, drilling rod is vibrated along leading truck, under jet stream pore-forming
Heavy, until stake bottom designed elevation, observing operating current should not exceed rated value, when extension drill rod, it is necessary to first close cement slurrypump
And air compressor machine, since loess has collapsibility, in jet stream sinking watching, jetting is forbidden to sink, in drilling rod sinking watching, slip casting machine
Pressure is maintained at 2-5Mpa, and slip casting machine pressure crosses macaroni sinking difficulty, and slip casting machine pressure is excessive to be easy to cause cement slurry to waste,
To prevent adjacent studs during whitewashing from influencing each other, slotting mode must be jumped using interlacing when intubation and constructed；
Step 7: first test pile obtains parameters of construction technology by test pile, carries out spray operation, when shotcrete pipe sinks to reaching design deeply
After degree, stop drilling, rotation does not stop, and high-pressure slurry pump pressure increasing to detail design value, air compressor machine pressure remains unchanged, side spray
Slurry, Bian Xuanzhuan, while drilling rod is promoted according to the promotion speed that design and test pile determine, after whirl spraying is completed in whole stake, confirm slip casting machine
It, could dismounting drilling rod after being closed with air compressor machine；
Step 8: after entire work surface whitewashing terminates, for drilling machine according to former stake position aperture again, aperture depth is road surface structare layer
Depth uses C20 concrete backfill after aperture；
Step 9: by high-pressure rotary jet grouting pile pile body drilling core examination high-pressure rotary jet grouting pile pile body uniaxial compressive strength and compound
Base bearing capacity, high-pressure rotary jet grouting pile pile body uniaxial compressive strength and Bearing Capacity of Composite Foundation should meet design requirement.
Embodiment 1
The present invention when specifically used, in highway Lanzhou, the capital G6 hiding, administer by section (second phase) maintenance engineering high-pressure rotary jet grouting pile
Construct 5024m, calms down section (silver section) damaged or destroyed by flood recovery project (second phase) project SK1693-SK1741 in G22 Lan-qin expressway
Section has 21 settlement points with XK1693-XK1741 sections, amounts to 4636 stake positions, and high-pressure rotary jet grouting pile administers construction 59587m.
In the construction of two above Highway Maintenance, Construction of High Pressure Jet Grouting Pile amounts to 64611m, in the construction process sternly
It is 25Mpa that lattice, which control grouting pressure, and ratio of mud 1:1, it is 0.15-0.25 (m/min) that drilling rod, which promotes speed, right after construction
Pile strength, Bearing Capacity of Composite Foundation are detected, and are all satisfied design requirement, and carried out data to practical cement slurry dosage
Statistics is as a result following such as table 1:
For 12m, the theoretical amount of every linear meter(lin.m.) cement slurry is carried out with volumetric method and discharge rate method respectively.
Volumetric method:
The equivalent every linear meter(lin.m.) of cement consumption is 189L.
Discharge rate method:
The equivalent every linear meter(lin.m.) of cement consumption is 575L.
In above formula:
Q-needs whitewashing amount (m3)；
De- whirl spraying induration diameter (m)；
D0- slip casting pipe diameter (m)；
K1- filling rate, 0.75~0.9；
h1- whirl spraying length (m)；
K2The filling rate of-non-whirl spraying range soil, 0.5~0.75；
h2- non-whirl spraying length (m)；
β-loss coefficient, 0.1~0.2；
V-promotion speed (m/min)；
H-spray penetration (m)；
Q-unit whitewashing amount (m3/min)。
By calculating above, the every linear meter(lin.m.) cement slurry dosage theoretical value of volumetric method is the 69.65% of actual count value；Discharge rate method
Every linear meter(lin.m.) cement slurry dosage theoretical value is the 211.90% of actual count value.The calculated result of obvious volumetric method is more nearly reality
Statistical value.By statistical analysis, discovery is long when stake, and cement slurry dosage is smaller.
On the basis of volumetric method, data fitting is carried out using Excel table, fits and is revolved suitable for Canal in Loess Area high pressure
Spray the calculation formula of stake cement slurry dosage.
Double tube method high-pressure rotary jet grouting pile punishment Canal in Loess Area subgrade settlement influences many because being known as of cement slurry dosage, and stake is long
Influence be mainly reflected in and return slurry and high roadbed soil does not consolidate two aspects, since construction parameter is constant in the long range of stake, in order to
Simplify and calculate, this engineering method is on the basis of original volumetric method calculation formula, it is assumed that has carried out the water of whirl spraying in the long range of entire stake
Mud is calculated using original formula and the every linear meter(lin.m.) cement slurry dosage result such as the following table 2 of engineering statistics:
The long influence coefficient of stake as shown in Fig. 1 and the long relational graph of stake are obtained according to table 2.
It is assumed that considering the long influence of stake, it can be deduced that following formula on the basis of carrying out whirl spraying in the long range of entire stake:
In formula:
Q-needs whitewashing amount (m3)；
D-whirl spraying induration diameter (m)；
K-filling rate, 0.75~0.9；
H-stake is long (m)；
β-loss coefficient, 0.1~0.2；
The long influence coefficient of x-stake.
Cement slurry dosage continues to use the formula of original soft clay area construction, it is clear that does not meet actual conditions, above formula pushes away
Out, be conducive to the finer controlled investment of owner's unit and unit in charge of construction carries out the control of cost control and construction quality.
Claims (2)
1. a kind of method of high-pressure rotary jet grouting pile double pipe ruling by law reason highway in loess area sedimentation, which is characterized in that this method according to
Following step carries out:
Step 1: after Area Of Safe Operation laying is finished, the roadbed side slope for treating improvement is reconnoitred, and discovery side slope, which exists, to be fallen into
When cave or longer through crack, simultaneously consolidation process is recorded in time, can carry out high-pressure rotary jet grouting pile work after consolidation process
Industry；
Step 2: treating the initial measurement of higher degree of road surface laying elevation observation point progress for administering roadbed, lay the side of elevation observation point
Formula is along the longitudinal 3 × 3m rectangular arrangement of route, work progress, and per half a day carries out a measurement of higher degree, according to road hump feelings
Condition adjusts grouting pressure in time, and to prevent, design requirement is not achieved in road surface raising height deficiency or raising height is excessively high causes road
Face cracking；
Step 3: the setting-out of stake position is carried out by construction drawing, when administering Bridgehead by Blastig sedimentation, the position of the first campshed position cross central line
For the position of abutment parados 1/2 diameter backward, when setting-out, should be according to expansion joint center line in bridge original design drawing and abutment parados
The distance between, the first campshed position cross central line is calculated at a distance from expansion joint, and stake position cross central line is vertical with route always
To vertical, after determining the first campshed position center line, the setting-out of stake position is carried out by design pilespacing, pile layout form and stake digit；
When administering general subgrade sedimentation, found out first according to the sedimentation combination design drawing of median strip corrugated guardrail or kerbstone
The maximum position of settling amount, then carries out precise measurement with level, determines its position center line, then settles feelings according to two sides
Condition carries out the setting-out of stake position；
Step 4: after setting-out, carrying out aperture operation with drilling machine, aperture protection is carried out after drilling and prepares cement slurry；
Step 5: preparing cement slurry according to the determining ratio of mud of design, when carrying out slurrying operation, water is added according to the ratio of mud first
The dosage of mud and water, Xian Jiashui stir 5min with pulper afterwards plus cement, and qualified to every disk cement slurry specific gravity self-test is laggard
Enter drilling and intubation process；
Step 6: when double tube method Construction of High Pressure Jet Grouting Pile, drilling and intubation two procedures be combined into one, before drilling, drilling machine by
Horizontal ruler is strictly leveled from both direction in length and breadth, and verticality must not exceed 1.5%；
Step 7: after shotcrete pipe reaches projected depth, stopping drilling, rotation does not stop, and high-pressure slurry pump pressure increases to detail design
Value, air compressor machine pressure remain unchanged, side whitewashing, Bian Xuanzhuan, while promoting drilling rod according to the promotion speed that design and test pile determine,
After whirl spraying is completed in whole stake, after confirming that slip casting machine and air compressor machine are closed, ability dismounting drilling rod carries out the construction of next pile body；
Step 8: after entire work surface whitewashing terminates, for drilling machine according to former stake position aperture again, aperture depth is road surface structare layer
Depth uses C20 concrete backfill after aperture；
Step 9: after construction, by strong to high-pressure rotary jet grouting pile pile body drilling core examination high-pressure rotary jet grouting pile pile body uniaxial compressive
Degree and Bearing Capacity of Composite Foundation, high-pressure rotary jet grouting pile pile body uniaxial compressive strength and Bearing Capacity of Composite Foundation should meet design requirement.
2. a kind of method of high-pressure rotary jet grouting pile double pipe ruling by law reason highway in loess area sedimentation as described in claim 1, special
Sign is that the calculation method that the amount of cement slurry is prepared in the step 5 is volumetric method, wherein volumetric method are as follows:
(1)
In (1) formula, Q is the whitewashing amount (m needed3)；
DeFor whirl spraying induration diameter (m)；
D0For slip casting pipe diameter (m)；
K1For filling rate, 0.75~0.9；
h1For whirl spraying length (m)；
K2For the filling rate of non-whirl spraying range soil, 0.5~0.75；
h2For non-whirl spraying length (m)；
β is loss coefficient, 0.1~0.2；
By statistical analysis, discovery is long when stake, and cement slurry dosage is smaller, on the basis of volumetric method, utilizes Excel table
Data fitting is carried out, the calculation formula suitable for Canal in Loess Area high-pressure rotary jet grouting pile cement slurry dosage is fitted are as follows:
(2)
(2) in formula, Q is the whitewashing amount (m needed3)；
D is whirl spraying induration diameter (m)；
K is filling rate, 0.75~0.9；
H is that stake is long (m)；
β is loss coefficient, 0.1~0.2；
X is the long influence coefficient of stake；
It can be obtained by above formula (2), cement slurry dosage continues to use the formula of original soft clay area construction, it is clear that does not meet practical feelings
Condition, formula (2) show that being conducive to the finer controlled investment of owner's unit and unit in charge of construction carries out cost control and construction
The control of quality.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910694810.4A CN110453678B (en) | 2019-07-30 | 2019-07-30 | Method for treating loess highway subgrade settlement by high-pressure jet grouting pile double-pipe method |
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| CN201910694810.4A CN110453678B (en) | 2019-07-30 | 2019-07-30 | Method for treating loess highway subgrade settlement by high-pressure jet grouting pile double-pipe method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111235993A (en) * | 2020-01-19 | 2020-06-05 | 吴桥县交通运输局 | Improvement device and improvement method for collapsible loess subgrade |
| CN111636450A (en) * | 2020-05-22 | 2020-09-08 | 中电建十一局工程有限公司 | Construction method of high-pressure rotary-spraying impervious wall on gravel layer |
| CN112281933A (en) * | 2020-10-19 | 2021-01-29 | 中铁六局集团有限公司 | Construction method of high-pressure jet grouting pile test |
| CN117782824A (en) * | 2024-02-26 | 2024-03-29 | 陇东学院 | Highway subgrade fixed-point pressure measurement equipment and measurement method |
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| CN101429766A (en) * | 2008-11-27 | 2009-05-13 | 吴哲慧 | Ground strengthened high pressure rotary spraying pile construction technique |
| CN105421328A (en) * | 2015-11-18 | 2016-03-23 | 中铁西北科学研究院有限公司 | Collapsible loess area roadbed foundation treatment structure and construction method |
| CN107542084A (en) * | 2016-06-24 | 2018-01-05 | 中国二十冶集团有限公司 | Hole pile making method is drawn in triple-pipe high pressure jet grouting stake under rubble, cobble geological environment |
| CN106223329A (en) * | 2016-08-08 | 2016-12-14 | 福建永强岩土股份有限公司 | A kind of construction method of full-sleeve rotary churning pile |
| CN108797598A (en) * | 2018-07-09 | 2018-11-13 | 江苏地基工程有限公司 | The construction technology of pre-loaded support struts in a kind of deep basal pit |
| CN109098175A (en) * | 2018-08-21 | 2018-12-28 | 江苏兴厦建设工程集团有限公司 | A kind of tri-axes deep mixing pile construction method |
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| CN111235993A (en) * | 2020-01-19 | 2020-06-05 | 吴桥县交通运输局 | Improvement device and improvement method for collapsible loess subgrade |
| CN111636450A (en) * | 2020-05-22 | 2020-09-08 | 中电建十一局工程有限公司 | Construction method of high-pressure rotary-spraying impervious wall on gravel layer |
| CN112281933A (en) * | 2020-10-19 | 2021-01-29 | 中铁六局集团有限公司 | Construction method of high-pressure jet grouting pile test |
| CN117782824A (en) * | 2024-02-26 | 2024-03-29 | 陇东学院 | Highway subgrade fixed-point pressure measurement equipment and measurement method |
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