CN104674800A - Method for forming high pressure jet grouting piles in peaty soil by using compounded curing agents - Google Patents
Method for forming high pressure jet grouting piles in peaty soil by using compounded curing agents Download PDFInfo
- Publication number
- CN104674800A CN104674800A CN201410846101.0A CN201410846101A CN104674800A CN 104674800 A CN104674800 A CN 104674800A CN 201410846101 A CN201410846101 A CN 201410846101A CN 104674800 A CN104674800 A CN 104674800A
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- China
- Prior art keywords
- jet grouting
- curing agent
- soil
- composite curing
- pressure rotary
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Classifications
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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
-
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a method for forming high pressure jet grouting piles in peaty soil by using compounded curing agents. According to the method, the high pressure jet grouting piles, soil reinforced by the compounded curing agents, the peaty soil and other soil surrounding the piles are used. The compounded curing agents (cement fly ash) are injected in a depth range of the peaty soil 3 by using a high pressure jet grouting technology; the compounded curing agents and the peaty soil perform a series of physical and chemical reactions; CaO and water react to generate Ca(OH)2; the Ca(OH)2, SiO2 and Al2O3 react to generate tobermorite and hydrated calcium aluminate which are hydraulic computation compounds; after the hydraulic computation compounds are condensed, formed gel layers are absorbed on surfaces of soil particles; the gel layers are gradually thickened along with reaction; the gel layers are expanded in a hydration process; and gaps among the soil particles are filled with the gel layers, so that an effect of reinforcing the peaty soil is achieved. The reinforced peaty soil facilitates pile forming of a high pressure jet grouting pile forming machine, a pile forming effect and peaty soil bearing capacity are guaranteed, the problem that the high pressure jet grouting piles are difficult to form during construction of the high pressure jet grouting piles in the peaty soil is solved, and the application range of the high pressure jet grouting piles is broadened.
Description
Technical field
The present invention relates to and a kind ofly adopt the piling method of the high-pressure rotary jet grouting pile of composite curing agent in peat swamps evolution, belong to field of civil engineering.
Background technology
Along with expanding economy, urban construction is constantly from center, city to the expansion of surrounding suburb and transfer, and the available land resources in inner city is more and more less, and many engineerings inevitably will be built on soft foundation.The weak soil that China extensively distributes has mud, mucky soil, peat and cumulosol etc.Current is for mud and mucky soil to Soft Soil Engineering Quality Research, and also few to cumulosol Quality Research.The engineering properties of cumulosol is poor, main manifestations is that organic content is high, void ratio is large, water content is high, natural density is little, compressibilty is high, shear strength is low, structural strong and highly sensitive, consolidation is slow.Usually can face pile body when carrying out Construction of High Pressure Jet Grouting Pile in peat swamps evolution and be difficult to shaping problem, cause pile quality poor, have a strong impact on pile body effect, this problem causes the extensive concern of engineers.
Summary of the invention
Order of the present invention is to solve above-mentioned prior art problem, propose a kind ofly to adopt the piling method of the high-pressure rotary jet grouting pile of composite curing agent in peat swamps evolution, the method effectively can not only solve pile body when high-pressure rotary jet grouting pile is constructed in cumulosol and be difficult to shaping problem, can also pile quality be ensured, strengthen cumulosol bearing capacity.
The present invention is completed by following method: the soil body (2) adopting the piling method of the high-pressure rotary jet grouting pile of composite curing agent in peat swamps evolution to be reinforced by high-pressure rotary jet grouting pile (1), composite curing agent, peat swamps evolution (3), banket (4), stake Zhou Qiyu soil layer (5,6) form.It is characterized by: first utilize high-pressure grout injector composite curing agent high pressure jet grouting mode to be injected into and intend carrying out in the peat swamps evolution depth bounds of high-pressure rotary jet grouting pile pile, allow composite curing agent and peat swamps evolution that a series of physical-chemical reaction occurs, reinforce cumulosol, improve foundation soil environment, again in the cumulosol earth of consolidation process in advance, carry out pile with high-pressure rotary-spray piling machinery; Make high-pressure rotary jet grouting pile (1).
Adopt composite curing agent to be Cement fly ash, the then mixed serum of cement, flyash and water, Cement fly ash match ratio should meet, and water and flyash are than being 1:0.75 ~ 1.10, flyash and cement are than being 1:0.3 ~ 1.5, and in composite curing agent, chemical composition is mainly SiO
2, Al
2o
3, CaO.
Using Cement fly ash as composite curing agent, utilize high pressure jet grouting technique to improve the slip casting depth bounds of cumulosol environment for upper and lower two borders of peat swamps evolution (3) are respectively more than 1 ~ 2m, the soil body (2) height/diameter that composite curing agent is reinforced is 1 ~ 2 times of high-pressure rotary jet grouting pile (1) diameter.
Adopt high-pressure grout injector to inject within the scope of peat swamps evolution by composite curing agent, its high-pressure grout injector and high-pressure rotary-spray piling machinery adopt stake type number of the same race.
Described high-pressure rotary jet grouting pile can adopt single pipe method, double-pipe method or three tube method to construct.
According to practice of construction district engineering geological conditions, which floor cumulosol construction area underground is distributed with, the corresponding soil body just having several sections of composite curing agents to reinforce, and for the situation of multilayer cumulosol, composite curing agent soil mass consolidation can sequential production, also sectional construction.
The method is equally applicable to the Construction of High Pressure Jet Grouting Pile in the soft foundations such as peat, mud, mucky soil.
Beneficial effect of the present invention is:
(1) flyash is cementitious material, utilizes the series of physical chemical reaction that flyash and cumulosol occur, and effectively can improve the unfavorable geology environment of cumulosol;
(2) flyash belongs to the industrial waste of coal-burning power plant, is used for by flyash improving geology soil environment and consolidated subsoil, reaches the greenery construction object turned waste into wealth;
(3) when carrying out Construction of High Pressure Jet Grouting Pile under cumulosol geological environment, pile body can be faced and be difficult to shaping, that pile quality is poor problem, said method is adopted can effectively to solve this construction Difficulties, and pile quality is good, enhance cumulosol bearing capacity, widen the scope of application of high-pressure rotary jet grouting pile.
Accompanying drawing explanation
Below by drawings and Examples, the present invention is described in further detail, but protection scope of the present invention is not limited to described content.
Fig. 1: the present invention adopts the high-pressure rotary jet grouting pile floor map of composite curing agent.
Fig. 2: the present invention adopts the high-pressure rotary jet grouting pile longitudinal profile schematic diagram (individual layer cumulosol) of composite curing agent.
Fig. 3: the present invention adopts the high-pressure rotary jet grouting pile longitudinal profile schematic diagram (multilayer cumulosol) of composite curing agent.
Fig. 4: the present invention adopts the high-pressure rotary jet grouting pile horizontal section schematic diagram (individual layer cumulosol) of composite curing agent.
Fig. 5: the present invention adopts the high-pressure rotary jet grouting pile horizontal section schematic diagram (multilayer cumulosol) of composite curing agent.
Annotate in figure: 1-high-pressure rotary jet grouting pile; The soil body that 2-composite curing agent is reinforced; 3-cumulosol; 4-banket; 5---stake other soil layers all, 6-stake other soil layer of week (can be any soil layer).
Detailed description of the invention
The soil body 2 that the present invention adopts the piling method of the high-pressure rotary jet grouting pile of composite curing agent in peat swamps evolution to be reinforced by high-pressure rotary jet grouting pile 1, composite curing agent, peat swamps evolution 3, stake Zhou Qiyu soil layer 4,5,6 form.
The present invention uses step as follows:
(1) according to place geological conditions and base pit engineering water-stop curtain stake designing requirement, construction technology and the parameter of high-pressure rotary jet grouting pile is determined;
(2) measuring spot plane Controling network;
(3) axis and the setting-out of stake position, pile-forming machine perching;
(4) make the mixed serum of (concrete and coal ash+water) in proportion as composite curing agent, adopt high pressure jet grouting technique to be injected into peat swamps evolution depth bounds;
(5) bore forming.
The present invention first utilizes high pressure jet grouting technique that composite curing agent (Cement fly ash) is injected peat swamps evolution depth bounds, reinforces cumulosol, improves foundation soil environment, then adopt high-pressure rotary jet grouting pile pile.The chemical composition of composite curing agent (Cement fly ash) is SiO
2, Al
2o
3and CaO, utilize high pressure jet grouting technique to be injected into cumulosol, make it that a series of physical-chemical reaction occur: CaO and water react and generates Ca (OH)
2, Ca (OH)
2again with SiO
2and Al
2o
3the hydrated calcium silicate that reaction generates and drated calcium aluminate are all hydraulicity compounds, form gel layer after its condensation and be adsorbed on soil particle surface, along with the gel layer that carries out of reaction thickeies gradually, and volume expands in hydration process, be filled with the space between soil particle, thus reach the effect of reinforcing cumulosol.Hydrated product Ca (OH)
2also can with Ca
2+, OH
-form exist, and with native microparticle surfaces with Na
+, K
+etc. carrying out cation exchange, the adhesion enhancing between grogs, make less soil particle form larger mass of soil kernel structure, thus change the engineering properties of cumulosol.Then in the cumulosol environment improved, high-pressure rotary jet grouting pile pile is carried out.
The present invention efficiently solves pile body when high-pressure rotary jet grouting pile is constructed in peat swamps evolution and is difficult to shaping problem, and pile quality is good, peat swamps evolution bearing capacity can be strengthened, be applicable to basement process and the construction of pattern foundation pit supporting structure water-stop curtain, can be used for architecture Foundation Pit Engineering and basement process
embodiment 1: as shown in Fig. 1,2,4, construction place is distributed with to the situation of individual layer cumulosol, the soil body scope adopting composite curing agent (Cement fly ash) to reinforce is 1 ~ 2 times of high-pressure rotary jet grouting pile diameter, and reinforcement depth scope is that peat swamps evolution up-and-down boundary respectively exceeds 1 ~ 2m.
In Cement fly ash, water and flyash are than being 1:1.10, and flyash and cement are than being 1:0.3, and the chemical composition of composite curing agent is SiO
2, Al
2o
3and CaO, adopt high pressure jet grouting technique to be injected around the cumulosol of plan pile by composite curing agent, make carbonaceous soil that a series of physical-chemical reaction occur: wherein CaO and water react and generates Ca (OH)
2, Ca (OH)
2again with SiO
2and Al
2o
3the hydrated calcium silicate that reaction generates and drated calcium aluminate are all hydraulicity compounds, form gel layer after its condensation and be adsorbed on soil particle surface, along with the gel layer that carries out of reaction thickeies gradually, and volume expands in hydration process, be filled with the space between soil particle, thus reach the effect of reinforcing cumulosol.Hydrated product Ca (OH)
2also can with Ca
2+, OH
-form exist, and with native microparticle surfaces with Na
+, K
+etc. carrying out cation exchange, the adhesion enhancing between grogs, make less soil particle form larger mass of soil kernel structure, thus change the engineering properties of cumulosol.Re-use
When utilizing the method effectively can solve peat swamps evolution mesohigh jet grouting pile construction, pile body is difficult to shaping problem, can also ensure pile quality, strengthens cumulosol bearing capacity.
embodiment 2: as shown in Fig. 1,3,5, construction place is distributed with to the situation of multilayer cumulosol, the soil body scope adopting composite curing agent (Cement fly ash) to reinforce is 1 ~ 2 times of high-pressure rotary jet grouting pile diameter, and reinforcement depth scope is that peat swamps evolution up-and-down boundary respectively exceeds 1 ~ 2m.
In composite curing agent (Cement fly ash), water and flyash are than being 1:0.75, and flyash and cement are than being 1:1.5, and the chemical composition of composite curing agent is SiO
2, Al
2o
3and CaO.Adopt high pressure jet grouting technique to be injected into cumulosol, make composite curing agent and cumulosol that a series of physical-chemical reaction occur: wherein CaO and water react and generates Ca (OH)
2, Ca (OH)
2again with SiO
2and Al
2o
3the hydrated calcium silicate that reaction generates and drated calcium aluminate are all hydraulicity compounds, form gel layer after its condensation and be adsorbed on soil particle surface, along with the gel layer that carries out of reaction thickeies gradually, and volume expands in hydration process, be filled with the space between soil particle, thus reach the effect of reinforcing cumulosol.Hydrated product Ca (OH)
2also can with Ca
2+, OH
-form exist, and with native microparticle surfaces with Na
+, K
+etc. carrying out cation exchange, the adhesion enhancing between grogs, make less soil particle form larger mass of soil kernel structure, thus change the engineering properties of cumulosol.When utilizing the method effectively can solve peat swamps evolution mesohigh jet grouting pile construction, pile body is difficult to shaping problem, can also ensure pile quality, strengthens cumulosol bearing capacity.
Claims (8)
1. adopt the piling method of the high-pressure rotary jet grouting pile of composite curing agent in peat swamps evolution, the soil body (2) reinforced by high-pressure rotary jet grouting pile (1), composite curing agent, peat swamps evolution (3), banket (4), stake Zhou Qiyu soil layer (5,6) form.
2. it is characterized by: first utilize high-pressure grout injector composite curing agent high pressure jet grouting mode to be injected into and intend carrying out in the peat swamps evolution depth bounds of high-pressure rotary jet grouting pile pile, allow composite curing agent and peat swamps evolution that a series of physical-chemical reaction occurs, reinforce cumulosol, improve foundation soil environment, again in the cumulosol earth of consolidation process in advance, carry out pile with high-pressure rotary-spray piling machinery; Make high-pressure rotary jet grouting pile (1).
3. the piling method of high-pressure rotary jet grouting pile in peat swamps evolution of employing composite curing agent according to claim 1, it is characterized by adopted composite curing agent is Cement fly ash, the then mixed serum of cement, flyash and water, Cement fly ash match ratio should meet, water and flyash are than being 1:0.75 ~ 1.10, and flyash and cement are than being 1:0.3 ~ 1.5, and in composite curing agent, chemical composition is mainly SiO
2, Al
2o
3, CaO.
4. the piling method of high-pressure rotary jet grouting pile in peat swamps evolution of employing composite curing agent according to claim 1 and 2, it is characterized by: using Cement fly ash as composite curing agent, utilize high pressure jet grouting technique to improve the slip casting depth bounds of cumulosol environment for upper and lower two borders of peat swamps evolution (3) are respectively more than 1 ~ 2m, the soil body (2) height/diameter that composite curing agent is reinforced is 1 ~ 2 times of high-pressure rotary jet grouting pile (1) diameter.
5. the piling method of high-pressure rotary jet grouting pile in peat swamps evolution of employing composite curing agent according to claim 1 and 2, it is characterized by: adopt high-pressure grout injector to inject within the scope of peat swamps evolution by composite curing agent, its high-pressure grout injector and high-pressure rotary-spray piling machinery adopt stake type number of the same race.
6. the piling method of high-pressure rotary jet grouting pile in peat swamps evolution of employing composite curing agent according to claim 1 and 2, is characterized by: described high-pressure rotary jet grouting pile can adopt single pipe method, double-pipe method or three tube method to construct.
7. the piling method of high-pressure rotary jet grouting pile in peat swamps evolution of employing composite curing agent according to claim 1 and 2, it is characterized by: according to practice of construction district engineering geological conditions, which floor cumulosol construction area underground is distributed with, the corresponding soil body just having several sections of composite curing agents to reinforce, for the situation of multilayer cumulosol, composite curing agent soil mass consolidation can sequential production, also sectional construction.
8. the piling method of high-pressure rotary jet grouting pile in peat swamps evolution of employing composite curing agent according to claim 1 and 2, is characterized by: the method is equally applicable to the Construction of High Pressure Jet Grouting Pile in the soft foundations such as peat, mud, mucky soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410846101.0A CN104674800A (en) | 2014-12-31 | 2014-12-31 | Method for forming high pressure jet grouting piles in peaty soil by using compounded curing agents |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410846101.0A CN104674800A (en) | 2014-12-31 | 2014-12-31 | Method for forming high pressure jet grouting piles in peaty soil by using compounded curing agents |
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|---|---|
| CN104674800A true CN104674800A (en) | 2015-06-03 |
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|---|---|---|---|
| CN201410846101.0A Pending CN104674800A (en) | 2014-12-31 | 2014-12-31 | Method for forming high pressure jet grouting piles in peaty soil by using compounded curing agents |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201528A (en) * | 2015-09-21 | 2015-12-30 | 中国矿业大学 | Silica sol slow infiltration reinforcing method of argillaceous soft rock |
| CN112279618A (en) * | 2020-11-12 | 2021-01-29 | 中冶成都勘察研究总院有限公司 | Additive for high-pressure rotary spraying construction |
| WO2021068235A1 (en) * | 2019-10-12 | 2021-04-15 | 潘弘杰 | High-strength curing agent application method for peat soil |
| CN113185236A (en) * | 2021-06-09 | 2021-07-30 | 中铁二十局集团第五工程有限公司 | Method for chemically improving lake-facies peat soil and application |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4063424A (en) * | 1975-09-10 | 1977-12-20 | Takenaka Komuten Co., Ltd. | Device for constructing a foundation in soft soil formations |
| EP1600560A1 (en) * | 2004-05-28 | 2005-11-30 | Smet F & C | A method and device for forming a pile |
| CN103669341A (en) * | 2013-12-17 | 2014-03-26 | 中铁四局集团有限公司 | Method for reinforcing jet grouting pile in peat soil and organic soil |
| CN103981862A (en) * | 2014-06-03 | 2014-08-13 | 上海隧道工程股份有限公司 | Cumulosol deep mixing pile structure |
| CN203891012U (en) * | 2014-06-03 | 2014-10-22 | 上海隧道工程股份有限公司 | Novel filling pile with prearranged clay pile |
-
2014
- 2014-12-31 CN CN201410846101.0A patent/CN104674800A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4063424A (en) * | 1975-09-10 | 1977-12-20 | Takenaka Komuten Co., Ltd. | Device for constructing a foundation in soft soil formations |
| EP1600560A1 (en) * | 2004-05-28 | 2005-11-30 | Smet F & C | A method and device for forming a pile |
| CN103669341A (en) * | 2013-12-17 | 2014-03-26 | 中铁四局集团有限公司 | Method for reinforcing jet grouting pile in peat soil and organic soil |
| CN103981862A (en) * | 2014-06-03 | 2014-08-13 | 上海隧道工程股份有限公司 | Cumulosol deep mixing pile structure |
| CN203891012U (en) * | 2014-06-03 | 2014-10-22 | 上海隧道工程股份有限公司 | Novel filling pile with prearranged clay pile |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201528A (en) * | 2015-09-21 | 2015-12-30 | 中国矿业大学 | Silica sol slow infiltration reinforcing method of argillaceous soft rock |
| WO2021068235A1 (en) * | 2019-10-12 | 2021-04-15 | 潘弘杰 | High-strength curing agent application method for peat soil |
| CN112279618A (en) * | 2020-11-12 | 2021-01-29 | 中冶成都勘察研究总院有限公司 | Additive for high-pressure rotary spraying construction |
| CN113185236A (en) * | 2021-06-09 | 2021-07-30 | 中铁二十局集团第五工程有限公司 | Method for chemically improving lake-facies peat soil and application |
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Application publication date: 20150603 |