CN109024531A - A kind of collapsible loess foundation construction treating methods - Google Patents
A kind of collapsible loess foundation construction treating methods Download PDFInfo
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- CN109024531A CN109024531A CN201810827572.5A CN201810827572A CN109024531A CN 109024531 A CN109024531 A CN 109024531A CN 201810827572 A CN201810827572 A CN 201810827572A CN 109024531 A CN109024531 A CN 109024531A
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- collapsible loess
- stake holes
- soil body
- soil
- loess foundation
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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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The present invention provides a kind of collapsible loess foundation construction treating methods, key steps are as follows: 1) in collapsible loess foundation boundary of works area, sinks to closed steel pile casting to form stake holes；2) hollow steel tube that 1-3 rows have nozzle is inserted into stake holes；3) operation for repeating step 1) and step 2) forms the stake holes with water filling device being uniformly abound with；4) high pressure pumping apparatus pressure water injection into hollow steel tube is utilized；5) situation is settled to the soil body and settling amount is observed record, until the soil body is deformed naturally and tended towards stability；6) reinforcement material is supplemented in stake holes, the epibasal tier soil body carries out consolidation process over the ground using heavy-tamping method or compacting method.The construction treating methods have many advantages, such as that dry field operation, speed of application fast, good economical benefit, foundation soil body bearing capacity be high and feature.
Description
Technical field:
The present invention relates to a kind of foundation basic construction method, especially a kind of Treatment method of collapsible loess foundation belongs to
Field of civil engineering.
Background technique:
China is vast in territory, complex geographical environment, and loess foundation ground is widely present in areas such as North China, Central China, northeast
Domain, and there is collapsibility more.Collapsible loess is a kind of soil of special nature, and soil property is more uniform, short texture, hole hair
It educates.When not by water-soaked, common intensity is higher, and compressibility is smaller.When by water-soaked, soil structure can be rapid under a certain pressure
It destroys, generates larger additional sinking, intensity reduces rapidly.
Currently, common processing method has cushion, compaction pile method, penetrates in collapsible loess foundation work progress
The methods of soil layer pile foundation method, but the generally existing limitation such as difficulty of construction is big, project cost is big, treatment effect is undesirable of these methods
Property.
Summary of the invention
The present invention provides a kind of collapsible loess foundation construction processing side primarily directed to the limitation of currently available technology
Method, key step are as follows:
1) in collapsible loess foundation boundary of works area, closed steel pile casting is sunk to by modes such as static pressure, hammering, vibrations
To form stake holes, stake holes depth is greater than yellow soil horizon of collapsibility thickness；
2) hollow steel tube that 1-3 rows have nozzle is inserted into stake holes, multiple rows of hollow steel tube insertion depth is not less than
Yellow soil horizon of collapsibility thickness；
3) operation that step 1) and step 2) are repeated according to a fixed spacing of design, in the collapsible loess of construction requirement
The stake holes with water filling device being uniformly abound with is formed in base basic plane；
4) high pressure pumping apparatus pressure water injection into hollow steel tube is utilized, the amount of pouring into of water is true according to ground water content of soil
It is fixed, make the collapsible loess soil body that self-weight collapsible sedimentation occur after immersion；
5) situation is settled to the soil body and settling amount is observed record, until the soil body is deformed naturally and tended towards stability；
6) reinforcement material is supplemented in stake holes, using heavy-tamping method or compacting method, the epibasal tier soil body carries out consolidation process over the ground,
And record is observed to soil body sedimentation situation, until soil deformation is stablized；
Further, above-mentioned process method step 1) described in closed steel pile casting be conical lower portion, it is more effective be conducive to it is heavy
Stake.
Further, above-mentioned process method step 1) described in steel pile casting formed stake holes after, pulled out before water-injection steel pipe is sunk to
Out.
Further, above-mentioned process method step 2) described in the closing of multiple rows of hollow steel tube bottom, in favor of flood effectiveness.
Further, above-mentioned process method step 2) described in hollow steel tube nozzle according to collapsible loess clay distribution feelings
Condition is symmetrically arranged, in favor of filling the water to soil mass of foundation pit permeating speed and effect.
Further, above-mentioned process method step 5) described in deform the standard to tend towards stability naturally according to the soil body be continuous
5d is averaged saturated yielding amount less than 1mm/d.
Further, above-mentioned process method step 6) described in soil stabilization material include cement, sand, flyash, chemistry
Strengthening agent etc..
The characteristics of above-mentioned Treatment method of collapsible loess foundation and advantage are: 1. using conical closure formula steel pile casting at
Hole is conducive to reduce counterbore resistance, is more convenient for constructing；2. using multi-row-type combination hollow steel tube water filling, first is that being conducive to accelerate
The injecting process shortens the construction period, second is that be uniformly distributed nozzle according to collapsible loess soil thickness, be more advantageous to pour into water to
Soil mass of foundation pit penetrates into effect；Third is that judging ground by observing foundation settlement situation in collapsible loess foundation treatment process
Water content of soil, can continue moisturizing or more exchange device draws water precipitation；Fourth is that in complicated collapsible loess foundation treatment process
In, equipment grouting and reinforcing can be passed through；3. handling collapsible loess foundation using this method, it is in dry field in construction area and makees
Industry is conducive to Field Force and mechanical work, is also beneficial to subsequent handling construction；4. on the basis of soil body collapsibility Equalsettlement
Upper carry out consolidation process, can significantly improve soil body foundation bearing capacity, meet the needs of upper building bearing capacity.
Detailed description of the invention
Fig. 1 is a kind of process chart of collapsible loess foundation construction treating methods of the invention.
1, weight, 2, steel pile casting, 3, steel pipe, 4, nozzle, 5, high-pressure hydraulic pump
Specific embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only used for
It is bright the present invention rather than limit the scope of the invention.
Embodiment one
As shown, Fig. 1 is a kind of case history process chart of collapsible loess foundation construction treating methods of the invention.
1) it as shown in figure 1 shown in I figure, in the collapsible loess soil layer with a thickness of 32m, sinks in such a way that weight 1 hammers
Entering diameter is the closed steel pile casting 2 of 800mm, and sinkage is that 30m forms stake holes, wherein the steel pile casting 2 is conical lower portion.
2) as shown in figure 1 shown in II figure, it is 180mm hollow water filling steel pipe 3 that three row's diameters are inserted into stake holes, wherein filling the water steel
Pipe 3 is according to reasonable Arrangement different level water injecting nozzles 4 situations such as soil body soil thickness, water content, to form waterflood path.
3) as shown in figure 1 shown in III figure, by high-pressure hydraulic pump 5 to combination 3 mesohigh of water-injection steel pipe water filling, injected water passes through
Nozzle 4 penetrates into soil layer.
4) as shown in figure 1 shown in IV figure, observational record collapsible loess foundation natural subsidence situation, and change water filling in time
Amount, until the soil body is deformed naturally and tended towards stability；
5) as shown in figure 1 shown in V figure, extract water-injection steel pipe 3 and use the weight repeated stock soil body, in stake holes layering insert
Rubble and compaction in layers, filling and tamping operation form compacted pile group up to surface of base in collapsible loess soil layer repeatedly,
Improve foundation bearing capacity.
It should be pointed out that above-mentioned embodiment is only intended to clearly illustrate example, and not to embodiment
It limits, there is no necessity and possibility to exhaust all the enbodiments.Each component part being not known in the present embodiment
It is realized with the prior art.For those skilled in the art, in the premise for not departing from the principle of the invention
Under, several improvements and modifications can also be made, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (7)
1. a kind of collapsible loess foundation construction treating methods, which is characterized in that mainly comprise the steps that
1) in collapsible loess foundation boundary of works area, closed steel pile casting is sunk to shape by modes such as static pressure, hammering, vibrations
At stake holes, stake holes depth is greater than yellow soil horizon of collapsibility thickness；
2) hollow steel tube that 1-3 rows have nozzle is inserted into stake holes, multiple rows of hollow steel tube insertion depth is not less than saturated yielding
Property loess formation thickness；
3) operation that step 1) and step 2) are repeated according to a fixed spacing of design, in the collapsible loess foundation base of construction requirement
The stake holes with water filling device being uniformly abound with is formed in plinth plane；
4) high pressure pumping apparatus pressure water injection into hollow steel tube is utilized, the amount of pouring into of water is determined according to ground water content of soil, is made
Self-weight collapsible sedimentation occurs after immersion for the collapsible loess soil body；
5) situation is settled to the soil body and settling amount is observed record, until the soil body is deformed naturally and tended towards stability；
6) reinforcement material is supplemented in stake holes, the epibasal tier soil body carries out consolidation process over the ground using heavy-tamping method or compacting method, and right
Soil body sedimentation situation is observed record, until soil deformation is stablized.
2. Treatment method of collapsible loess foundation according to claim 1, which is characterized in that closed described in step 1)
Steel pile casting is conical lower portion.
3. Treatment method of collapsible loess foundation according to claim 1, which is characterized in that steel pile casting described in step 1)
After forming stake holes, extracted before water-injection steel pipe is sunk to.
4. Treatment method of collapsible loess foundation according to claim 1, which is characterized in that in multiple rows of described in step 2)
Empty steel pipe bottom closing, in favor of flood effectiveness.
5. Treatment method of collapsible loess foundation according to claim 1, which is characterized in that cored steel described in step 2)
Pipe nozzle is symmetrically arranged according to collapsible loess clay distribution situation, in favor of filling the water to soil mass of foundation pit permeating speed and effect
Fruit.
6. Treatment method of collapsible loess foundation according to claim 1, which is characterized in that according to soil described in step 5)
It is that continuous 5d is averaged saturated yielding amount less than 1mm/d that body deforms the standard to tend towards stability naturally.
7. Treatment method of collapsible loess foundation according to claim 1, which is characterized in that the soil body described in step 6) adds
Gu material includes cement, sand, flyash, chemical consolidation agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810827572.5A CN109024531A (en) | 2018-07-25 | 2018-07-25 | A kind of collapsible loess foundation construction treating methods |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810827572.5A CN109024531A (en) | 2018-07-25 | 2018-07-25 | A kind of collapsible loess foundation construction treating methods |
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| Publication Number | Publication Date |
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| CN109024531A true CN109024531A (en) | 2018-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810827572.5A Pending CN109024531A (en) | 2018-07-25 | 2018-07-25 | A kind of collapsible loess foundation construction treating methods |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111676949A (en) * | 2020-05-08 | 2020-09-18 | 江苏盛泰建设工程有限公司 | A consolidate stake machine for collapsible loess reinforcement construction |
| CN117845874A (en) * | 2024-03-07 | 2024-04-09 | 国网山西省电力公司经济技术研究院 | Pressurized control water injection system for low-water-content collapsible loess field |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105970911A (en) * | 2016-07-01 | 2016-09-28 | 王继忠 | Treatment method for large-thickness collapsible loess |
| CN106320314A (en) * | 2016-08-30 | 2017-01-11 | 王继忠 | Collapsible loess treatment method |
| CN106703004A (en) * | 2017-03-14 | 2017-05-24 | 王继忠 | Treatment method for collapsible loess foundation |
| CN107761708A (en) * | 2017-09-18 | 2018-03-06 | 庆阳敦博科技发展有限公司 | The processing method that big thickness Collapsible Loess District Subway station groundwork is reinforced |
-
2018
- 2018-07-25 CN CN201810827572.5A patent/CN109024531A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105970911A (en) * | 2016-07-01 | 2016-09-28 | 王继忠 | Treatment method for large-thickness collapsible loess |
| CN106320314A (en) * | 2016-08-30 | 2017-01-11 | 王继忠 | Collapsible loess treatment method |
| CN106703004A (en) * | 2017-03-14 | 2017-05-24 | 王继忠 | Treatment method for collapsible loess foundation |
| CN107761708A (en) * | 2017-09-18 | 2018-03-06 | 庆阳敦博科技发展有限公司 | The processing method that big thickness Collapsible Loess District Subway station groundwork is reinforced |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111676949A (en) * | 2020-05-08 | 2020-09-18 | 江苏盛泰建设工程有限公司 | A consolidate stake machine for collapsible loess reinforcement construction |
| CN117845874A (en) * | 2024-03-07 | 2024-04-09 | 国网山西省电力公司经济技术研究院 | Pressurized control water injection system for low-water-content collapsible loess field |
| CN117845874B (en) * | 2024-03-07 | 2024-05-14 | 国网山西省电力公司经济技术研究院 | Pressurized control water injection system for low-water-content collapsible loess field |
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Application publication date: 20181218 |