CN105421334A - Construction method for soil freezing - Google Patents
Construction method for soil freezing Download PDFInfo
- Publication number
- CN105421334A CN105421334A CN201510759781.7A CN201510759781A CN105421334A CN 105421334 A CN105421334 A CN 105421334A CN 201510759781 A CN201510759781 A CN 201510759781A CN 105421334 A CN105421334 A CN 105421334A
- Authority
- CN
- China
- Prior art keywords
- freezing
- soil
- construction
- temperature
- soil body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a construction method for soil freezing. The method includes the steps that firstly, brine freezing construction operation is conducted on soil; and secondly, the temperature of the soil is measured, and when the temperature of the soil is below zero, liquid nitrogen freezing construction operation is conducted on the soil until the temperature of the soil is decreased to a set freezing temperature. According to the construction method for soil freezing, the characteristics that brine freezing cost is low and the temperature decrease speed and efficiency of earlier-stage brine freezing are high are used to the maximum extent and combined with the characteristic of quick liquid nitrogen freezing, so that a reinforcing body rapidly reaches the required temperature, and the requirement for soil reinforcement is met. Freezing construction efficiency can be effectively improved, construction cost is lowered, and the method is suitable for freezing construction under various complex geological conditions, especially the geological conditions of large underground water level changes due to the influence of surrounding rivers, seasonal rainfall, surrounding precipitation construction and the like.
Description
Technical field
The invention belongs to freezing soil technical field, especially a kind of construction method of freezing soil.
Background technology
When freezing the soil body, brine freezing and liquid nitrogen freezing construction use two kinds of many techniques at present.
Salt solution as a kind of well freeze medium, general positive freezing period brine temp be-28 ~ 30 DEG C, and brine freezing construction because cheap, equipment is simple, maneuverable feature, very general applies in the construction of consolidation by freezing.But there is the longer shortcoming of freeze-off time clearly in brine freezing, generally needs the duration of freezing of 40 ~ 50 days.
Liquid nitrogen is a kind of desirable refrigerant.Under normal pressure, its boiling point is-195.8 DEG C, and evaporation latent heat is 250kJ/m3.Liquid nitrogen freezing technique can be described as " quick freezing technique ", because use liquid nitrogen only to need the very short time to freeze the soil body, can reach 10 times of conventional brines circulation freezing speed.Liquid nitrogen freezing is without the need to installing refrigeration station and only need freezing pipe insert into stratum in building site.Start the sixties in 20th century to apply in soil layer stabilization works in countries such as American and Britain, day, method, Russia, meanings, the underground construction in the busy area of urban traffic and process emergency works accident etc. play reinforces and good ground effect.But the power consumption such as the manufacture of liquid nitrogen and cooling is higher, store and traffic condition very harsh, cost is higher, and therefore, it is wideless that employing liquid nitrogen carries out the range of application of frozen construction.
Summary of the invention
The object of the present invention is to provide a kind of construction method of freezing soil, the problem that freeze-off time in prior art is longer to solve, cost is higher.
In order to achieve the above object, the invention provides a kind of construction method of freezing soil, comprising:
Step one: brine freezing constructing operation is carried out to the soil body;
Step 2: the temperature detecting the described soil body, when the temperature of the described soil body is subzero, carries out liquid nitrogen freezing constructing operation to the described soil body, till in time the temperature of the described soil body being reduced to the solidification point of setting.
Further, in step one, hole in the soil body and frigo is installed, utilizing sub-zero brine recycling to reduce formation temperature.
Further, in the described soil body, bore paving upright opening or lateral aperture, then frigo is arranged in the hole of boring paving.
Further, in step 2, liquid nitrogen is transported to bottom freezing pipe by pipeline, described liquid nitrogen of then vaporizing, to realize freezing the described soil body.
The invention provides a kind of construction method of freezing soil, maximized utilize brine freezing cheap and fast, the feature that efficiency is high of brine freezing cooling rate in early stage, in conjunction with the quick freezing feature of liquid nitrogen, make reinforcing body reach rapidly the temperature of given requirements, meet the requirement of soil stabilization.Effectively can improve the efficiency of frozen construction, reduce construction cost, and be applicable to the frozen construction of the geological conditions of various complexity, particularly affect groundwater table by periphery rivers, seasonal precipitation, periphery dewatering construction etc. and occur in the geological conditions of larger change.
Accompanying drawing explanation
The construction process figure of the freezing soil that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with schematic diagram, the specific embodiment of the present invention is described in more detail.According to following description and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
Inventor finds through lot of experiments, only uses brine freezing generally to need the solidification point that just can be frozen into setting for 40 ~ 60 days.Wherein, brine freezing efficient freezing period, is generally 15 ~ 20 days, and freezing curtain temperature declines very fast during this period, and Frozen Soil temperature reduces very fast, generally be easy to reach 0 ~-2 DEG C, average rate of temperature fall is now 1.5 ~ 2 DEG C/d (degree Celsius/day).Treat freezing curtain reach subzero after; if still adopt the reinforcing mode of brine freezing; because freezing curtain and the extraneous temperature difference are comparatively large, freeze backstage temperature loss serious etc., cause this stage freezing curtain temperature to decline slowly; therefore after needing to continue to freeze about 20 ~ 40 days; can reach the solidification point of designing requirement, the average cooling rate in this stage is 0.3 ~ 0.5 DEG C/d, freezes cooling rate and enters lag phase; freeze effect be only early stage 1/3, freeze efficiency and greatly reduce.
Based on this, as shown in Figure 1, embodiments provide a kind of construction method of freezing soil, comprising:
Step one: brine freezing constructing operation is carried out to the soil body;
Step 2: the temperature detecting the described soil body, when the temperature of the described soil body is subzero, carries out liquid nitrogen freezing constructing operation to the described soil body, till in time the temperature of the described soil body being reduced to the solidification point of setting.
Therefore, the operating principle of combination is mutually frozen according to salt solution+liquid nitrogen, present invention, avoiding only adopt in brine freezing process need to experience freeze lag phase, highlight the advantage of two kinds of reinforcing modes, weaken the shortcoming of two kinds of reinforcing modes, the present invention can reduce construction period 20 ~ 40 days in theory, therefore improves efficiency of construction.
In step one, hole in the soil body and frigo is installed, utilizing sub-zero low temperature (salt solution of approximately subzero 30 degree) brine recycling to reduce formation temperature.In the present embodiment, in the described soil body, bore paving upright opening or lateral aperture, then frigo is arranged in the hole of boring paving.
In step 2, liquid nitrogen is transported to bottom freezing pipe by pipeline, described liquid nitrogen of then vaporizing, to realize freezing the described soil body.
As shown in table 1, in subway work engineering, table 1 is the performances of employing three kinds of construction methods to In Subway Project shield structure receiving terminal consolidation by freezing, in this project, and design solidification point-10 DEG C, Frozen wall thickness 2.4 meters.
Table 1
Known by this table, adopt salt solution+liquid nitrogen freeze the construction method of combination mutually and be used alone the method for liquid nitrogen freezing, the engineering time decreases 24 days, and operating expenses about reduces 4 times, substantially increases efficiency of construction, reduces construction cost.
The invention provides a kind of construction method of freezing soil, maximized utilize brine freezing cheap and fast, the feature that efficiency is high of brine freezing cooling rate in early stage, in conjunction with the quick freezing feature of liquid nitrogen, make reinforcing body reach rapidly the temperature of given requirements, meet the requirement of soil stabilization.Effectively can improve the efficiency of frozen construction, reduce construction cost, and be applicable to the frozen construction of the geological conditions of various complexity, particularly affect groundwater table by periphery rivers, seasonal precipitation, periphery dewatering construction etc. and occur in the geological conditions of larger change.Such as, Changjiang alluvial plain geology is mainly fine sand layer, in this geology, groundwater table affects by precipitation, water level of yangtze river etc. and changes greatly, usually in brine freezing construction, the situation occurring sudden drawdown or uprush, cause the medium of brine freezing-groundwater table to reduce or mobility increases suddenly, such that the effect of consolidation by freezing cannot effectively control, temperature reduces comparatively slow, increase work consumption.
Above are only the preferred embodiments of the present invention, any restriction is not played to the present invention.Any person of ordinary skill in the field; in the scope not departing from technical scheme of the present invention; the technical scheme disclose the present invention and technology contents make the variations such as any type of equivalent replacement or amendment; all belong to the content not departing from technical scheme of the present invention, still belong within protection scope of the present invention.
Claims (4)
1. a construction method for freezing soil, is characterized in that, comprising:
Step one: brine freezing constructing operation is carried out to the soil body;
Step 2: the temperature detecting the described soil body, when the temperature of the described soil body is subzero, carries out liquid nitrogen freezing constructing operation to the described soil body, till in time the temperature of the described soil body being reduced to the solidification point of setting.
2. the construction method of freezing soil as claimed in claim 1, is characterized in that, in step one, hole and install frigo in the soil body, utilizes sub-zero brine recycling to reduce formation temperature.
3. the construction method of freezing soil as claimed in claim 2, is characterized in that, in the described soil body, bore paving upright opening or lateral aperture, is then arranged on by frigo in the hole of boring paving.
4. the construction method of freezing soil as claimed in claim 1, is characterized in that, in step 2, transport to bottom freezing pipe by liquid nitrogen by pipeline, described liquid nitrogen of then vaporizing, to realize freezing the described soil body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510759781.7A CN105421334A (en) | 2015-11-10 | 2015-11-10 | Construction method for soil freezing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510759781.7A CN105421334A (en) | 2015-11-10 | 2015-11-10 | Construction method for soil freezing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105421334A true CN105421334A (en) | 2016-03-23 |
Family
ID=55499846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510759781.7A Pending CN105421334A (en) | 2015-11-10 | 2015-11-10 | Construction method for soil freezing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105421334A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908696A (en) * | 2016-06-03 | 2016-08-31 | 长春工程学院 | Foundation pit frozen soil retaining wall device and freezing method thereof |
| CN110168169A (en) * | 2016-10-27 | 2019-08-23 | 林德股份公司 | For nitrogen-brine freezing combination freeze head |
| CN112554164A (en) * | 2020-11-08 | 2021-03-26 | 上海市隧道工程轨道交通设计研究院 | Artificial stratum freezing method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287190A (en) * | 2011-09-08 | 2011-12-21 | 同济大学 | Method for freezing high-gradient nonhomogeneous freezing wall |
| CN103046566A (en) * | 2012-12-28 | 2013-04-17 | 中煤第五建设有限公司 | Simple method for judging and managing open type frozen window |
| CN103276720A (en) * | 2013-05-31 | 2013-09-04 | 中国矿业大学 | Soft soil subgrade freezing reinforcement method |
| CN103277108A (en) * | 2013-04-19 | 2013-09-04 | 中铁隧道集团有限公司 | Slurry shield tunneling machine underwater arrival construction method |
| CN103343531A (en) * | 2013-07-26 | 2013-10-09 | 刘波 | Freezing strengthening construction method for partial stratums difficult to freeze |
| EP2757199A1 (en) * | 2013-01-22 | 2014-07-23 | Linde Aktiengesellschaft | Method and device for icing a soil mass |
-
2015
- 2015-11-10 CN CN201510759781.7A patent/CN105421334A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287190A (en) * | 2011-09-08 | 2011-12-21 | 同济大学 | Method for freezing high-gradient nonhomogeneous freezing wall |
| CN103046566A (en) * | 2012-12-28 | 2013-04-17 | 中煤第五建设有限公司 | Simple method for judging and managing open type frozen window |
| EP2757199A1 (en) * | 2013-01-22 | 2014-07-23 | Linde Aktiengesellschaft | Method and device for icing a soil mass |
| CN103277108A (en) * | 2013-04-19 | 2013-09-04 | 中铁隧道集团有限公司 | Slurry shield tunneling machine underwater arrival construction method |
| CN103276720A (en) * | 2013-05-31 | 2013-09-04 | 中国矿业大学 | Soft soil subgrade freezing reinforcement method |
| CN103343531A (en) * | 2013-07-26 | 2013-10-09 | 刘波 | Freezing strengthening construction method for partial stratums difficult to freeze |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908696A (en) * | 2016-06-03 | 2016-08-31 | 长春工程学院 | Foundation pit frozen soil retaining wall device and freezing method thereof |
| CN110168169A (en) * | 2016-10-27 | 2019-08-23 | 林德股份公司 | For nitrogen-brine freezing combination freeze head |
| CN112554164A (en) * | 2020-11-08 | 2021-03-26 | 上海市隧道工程轨道交通设计研究院 | Artificial stratum freezing method |
| CN112554164B (en) * | 2020-11-08 | 2022-02-11 | 上海市隧道工程轨道交通设计研究院 | Artificial stratum freezing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2015383062B2 (en) | Liquid nitrogen cyclic freeze-thaw permeability-improvement gas drainage method based on horizontal directional borehole | |
| AU2019376347B2 (en) | A method for coal mining based on frozen aquifer for underground longwall face under water-conservation condition | |
| CN103541762B (en) | A kind of High aititude severe cold rich water tunnel faces the antifreeze water discharge method of combination forever | |
| CN105804761B (en) | Construction method suitable for liquefied sand stratum shield near-distance passing through building | |
| CN104963334A (en) | Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing | |
| CN206784453U (en) | The concrete foundation anti-freeze expansion structure of Frozen Ground Area | |
| CN201460904U (en) | Ultra-long horizontal freezing consolidation structure for shield entry | |
| CN105545355A (en) | Drainage structure suitable for tunnel bottom in water-rich rock stratum | |
| CN105298438A (en) | Multi-round polymer gel deep fine profile control method | |
| CN106837389B (en) | A kind of Underground Subway Station vertical shaft and transverse passage-way freeze water-stopping method | |
| CN105421334A (en) | Construction method for soil freezing | |
| CN105297742A (en) | Structure and method of water stopping support of underground space | |
| CN101419221A (en) | Computation method for frost heaving characteristic for deep seasonal frozen ground subgrade | |
| CN204551510U (en) | A kind of filled-up ground catchments pressure reduction well drop and drainage structure | |
| Bowers Jr et al. | Experimental investigation of bridge deck deicing using energy piles | |
| Kovačević et al. | Possibilities of underground engineering for the use of shallow geothermal energy | |
| JP2001003350A (en) | Soil improvement method by board drain making use of freezing-thawing | |
| CN203685289U (en) | High-altitude severe cold rich water channel permanent and temporary combined freeze-proofing drainage structure | |
| CN103343531B (en) | Local difficult frozen ground intensified freezing construction method | |
| CN106468152A (en) | A kind of thick oil horizontal well intensity adjustable shutoff method | |
| CN109268068A (en) | Frozen Ground Area constructing metro tunnel causes the prediction technique of surface settlement control value | |
| Zhang et al. | A Case Study of Energy‐Saving and Frost Heave Control Scheme in Artificial Ground Freezing Project | |
| Sheng et al. | Possible frost heave mechanisms in an unsaturated high-speed railway formation | |
| CN104653189A (en) | Whole-covering type horizontal freezing method end soil reinforcement shield tunnel-entering construction method | |
| CN206267226U (en) | Using existing stratum as the groundwater reservoir of retaining cavernous body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160323 |
|
| WD01 | Invention patent application deemed withdrawn after publication |