CN108411885A - A kind of basement rock overlying sandy soil karst treatment construction method - Google Patents
A kind of basement rock overlying sandy soil karst treatment construction method Download PDFInfo
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- CN108411885A CN108411885A CN201810312460.6A CN201810312460A CN108411885A CN 108411885 A CN108411885 A CN 108411885A CN 201810312460 A CN201810312460 A CN 201810312460A CN 108411885 A CN108411885 A CN 108411885A
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- grouting
- construction method
- sleeve
- basement rock
- casing
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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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to city track traffic engineering fields, and in particular to a kind of basement rock overlying sandy soil karst treatment construction method.This construction method includes the following steps：Large diameter hole is bored, makes first sleeve with drilling into basement rock；Grouting.In drilling, first sleeve is with drilling into basement rock so that first sleeve can play the role of solid hole in large diameter hole, be collapsed to avoid the sandy soil of large diameter hole hole wall from flowing into perforative solution cavity, soil erosion is avoided, prevents from collapsing on a large scale and causes safety accident.
Description
Technical field
The present invention relates to a kind of city track traffic engineering, especially a kind of basement rock overlying sandy soil karst treatment construction party
Method.
Background technology
The karst treatment ordinary circumstance in city track traffic engineering field is, above Karst Cave Formation the soil body be clay etc. compared with
For stable stratum or have in the rock stratum of certain globality, the scheme of slip casting is carried out using directly drilling down tube.If but
Encountering causes above Karst Cave Formation when covering the stratum such as sandy soil, easily to occur drilling breakdown Upper Plate of Karst Cave in boring procedure
Square soil erosion even collapses on a large scale, while can not effectively be filled the processing such as sand, slip casting filling reinforcing.Have in this way
Stratum is secondary when follow-up building may be caused to construct or run collapses to the loss of bringing on a disaster property of engineering.
Invention content
The goal of the invention of the present invention is：In view of the problems of the existing technology, a kind of basement rock overlying sandy soil rock is provided
Molten processing construction method.
To achieve the goals above, the technical solution adopted by the present invention is：
A kind of basement rock overlying sandy soil karst treatment construction method, includes the following steps：
Large diameter hole is bored, makes first sleeve with drilling into basement rock；
Grouting.
In drilling, first sleeve is with drilling into basement rock so that first sleeve can play solid hole work in large diameter hole
With to avoid the sandy soil of large diameter hole hole wall from collapsing, avoiding soil erosion, prevent safety accident.
It is further comprising the steps of before grouting step as the preferred embodiment of the present invention：
Small diameter bore is bored in the bottom of large diameter hole；
The second casing is placed in first sleeve, and the second casing and the basement rock of small diameter bore hole wall is made to be bonded；
When grouting, carried out in the second casing.
By the way that the second smaller casing is arranged in first sleeve so that first sleeve can be removed, and avoid
The presence of sleeve influences follow-up shield-tunneling construction.
As the preferred embodiment of the present invention, first sleeve is steel sleeve, in the basement rock of the second casing and small diameter bore hole wall
After fitting, follow the steps below：
Take out first sleeve.
First sleeve is set as steel sleeve, and steel sleeve has enough intensity, disclosure satisfy that with the requirement for boring down tube.But by
It is high in the intensity of first sleeve, it is unlikely to deform, therefore, first sleeve stays in large diameter hole, is easy the locking in filling process,
It is not easy to take out first sleeve, and then influences subsequent shield-tunneling construction.Therefore, before grouting, second is disposed in first sleeve
Casing after taking out first sleeve, then carries out grouting operation, so as to avoid first in relatively small second casing of size
Casing is retained in the harmful effect brought in large diameter hole.
As the preferred embodiment of the present invention, the second casing is PPR pipe.
Second casing selects PPR pipe, and relative to steel sleeve, the intensity of PPR pipe is relatively low, therefore, PPR pipe is stayed in hole
In, do not interfere with subsequent construction.
A part for stop grouting plug is embedded in the second casing, another portion in grouting as the preferred embodiment of the present invention
Divide and is embedded in basement rock.
The 1/3 of stop grouting plug is embedded in the second casing, by stop grouting plug in grouting as the preferred embodiment of the present invention
2/3 be embedded in basement rock.
In order to ensure can smoothly to extract stop grouting plug after grouting, a part for stop grouting plug is embedded in the second casing,
Another part buries in basement rock.Specifically, making the 1/3 of stop grouting plug to be embedded in the second casing, 2/3 is embedded in basement rock, this length
Degree is assigned that the position of stop grouting plug can either be made to stablize, and smoothly extract stop grouting plug after the completion of grouting.
As the preferred embodiment of the present invention, in first sleeve with drilling into basement rock, first sleeve enters the depth of basement rock
More than the depth of solution crack in basement rock.
Due to having solution crack close to the part of sandy soil in basement rock, solution crack part is not complete basement rock.Therefore, if first
The depth that casing enters basement rock is insufficient, makes first sleeve that can not pass through solution crack part, is in the milk under these conditions, still may be by
Lead to soil erosion in the imperfection of solution crack or collapses.First sleeve is set to enter depth of the depth more than solution crack in basement rock of basement rock
Degree can then occur to avoid this accident.
As the preferred embodiment of the present invention, in grouting, priority perfusion is carried out using the different slurries of the ratio of mud, is first used
The higher slurries of the ratio of mud are poured into a mould, and are reused the lower slurries of the ratio of mud and are poured into a mould.
It in grouting, is first poured into a mould using the higher slurries of the ratio of mud, the slurries for then using the ratio of mud relatively low
It is poured into a mould.The advantageous effect of this grouting operation is：First slip casting channel is dredged using the slurries of low concentration, is reached in proper order
Progressive purpose avoids the slurries for using high concentration at the beginning by channel blockage, effective filling effect is not achieved.
It is further comprising the steps of as the preferred embodiment of the present invention：
Supplement slip casting.
After the completion of grouting step, there may be different degrees of gaps in the second casing so that is easy in subsequent construction
Situations such as generating grout, therefore, after the completion of grouting, carries out supplement slip casting in the second casing.
As the preferred embodiment of the present invention, when supplementing slip casting, stop grouting plug is promoted to the position for being not more than 1m apart from ground
It sets, pressurizes to stop grouting plug, carry out grouting operation.
Specifically, supplement slip casting is adopted and carried out with the aforedescribed process, principle is：By injected hole be stuffed entirely with it is closely knit after, remain
Remaining 1m depth can be completed directly by supplementing slip casting, can effectively complete injected hole closure, prevent follow-up shield driving
When grout etc..
As the preferred embodiment of the present invention, when supplementing slip casting, the ratio of mud of slurries is less than the water of slurries in grouting step
Gray scale.
The slurries of consistency bigger can ensure that Grouting Pipe can be effectively full of, and can be coagulated in a relatively short period of time in confined space
Gu while occurring, compared with large fracture, reaching preferable plugging effect after preventing the later stage from solidifying.
As the preferred embodiment of the present invention, in grouting, be connected to flow instrument and pressure gauge on grout pipe, grouting pressure with
Filling process is gradually increased, and after reaching whole slurry standard, terminates grouting.
It can solve have caused by grouting quantity deficiency by default rational slurry standard eventually by above-mentioned method
Effect filling；Slurries enter layer of sand caused by can also avoiding grouting quantity excess, the problems such as avoiding wasting.
As the preferred embodiment of the present invention, whole slurry standard is：When reaching design grouting termination pressure, if grouting flow is small
In preset termination flow, after continuing preset termination duration, grouting is terminated.
As the preferred embodiment of the present invention, design grouting termination pressure is 1.5Mpa-2.5Mpa, and preset termination flow is
25-35L/min, when preset termination a length of 10-20min.
Pressure when having considered whole slurry in whole slurry standard and the parameters such as flow of being in the milk so that when cut-off is starched eventually, slip casting
Amount is reasonable.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1. when boring large diameter hole, first sleeve can avoid sandstone from missing completely with pipe to rock stratum, essentially eliminate biography
System technique construct in the stratum existing for risk；
2. being provided with the second casing in first sleeve so that first sleeve can be taken out before grouting, avoid first sleeve
Harmful effect is generated to subsequent construction；
3. in filling process, slurry standard eventually is determined by parameters such as pressure, flows, grouting deficiency can be solved, be in the milk
Amount can not hold the problems such as pressure.
Description of the drawings
Fig. 1 is the construction process figure of the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings, the present invention is described in detail.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Embodiment
It please refers to Fig.1.The present invention provides a kind of basement rock overlying sandy soil karst treatment construction methods, including following step
Suddenly：
Large diameter hole is bored, makes first sleeve with drilling into basement rock；
Grouting.
By above-mentioned construction method, in drilling, first sleeve is with drilling into basement rock so that first sleeve can be big
Play the role of solid hole in diametric hole, to avoid the sandy soil of large diameter hole hole wall from collapsing, avoids soil erosion, prevent from pacifying
Full accident occurs.
Preferably, further comprising the steps of before grouting step：
Small diameter bore is bored in the bottom of large diameter hole；
The second casing is placed in first sleeve, and the second casing and the basement rock of small diameter bore hole wall is made to be bonded；
When grouting, carried out in the second casing.
By the way that the second smaller casing is arranged in first sleeve so that first sleeve can be removed, and avoid
The presence of sleeve influences follow-up shield-tunneling construction.
Preferably, first sleeve is steel sleeve, after the second casing is bonded with the basement rock of small diameter bore hole wall, is carried out following
Step：
Take out first sleeve.
First sleeve is set as steel sleeve, and steel sleeve has enough intensity, disclosure satisfy that with the requirement for boring down tube.But by
It is high in the intensity of first sleeve, it is unlikely to deform, therefore, first sleeve stays in large diameter hole, is easy the locking in filling process,
It is not easy to take out first sleeve, and then influences subsequent shield-tunneling construction.Therefore, before grouting, second is disposed in first sleeve
Casing after taking out first sleeve, then carries out grouting operation, so as to avoid first in relatively small second casing of size
Casing is retained in the harmful effect brought in large diameter hole.
Preferably, the second casing is PPR pipe.
Second casing selects PPR pipe, and relative to steel sleeve, the intensity of PPR pipe is relatively low, therefore, PPR pipe is stayed in hole
In, do not interfere with subsequent construction.
Preferably, in grouting, a part for stop grouting plug is embedded in the second casing, another part is embedded in basement rock
It is interior.
Preferably, in grouting, the 1/3 of stop grouting plug is embedded in the second casing, basement rock is embedded in by the 2/3 of stop grouting plug
It is interior.
In order to ensure can smoothly to extract stop grouting plug after grouting, a part for stop grouting plug is embedded in the second casing,
Another part buries in basement rock.Specifically, making the 1/3 of stop grouting plug to be embedded in the second casing, 2/3 is embedded in basement rock, this length
Degree is assigned that the position of stop grouting plug can either be made to stablize, and smoothly extract stop grouting plug after the completion of grouting.
Preferably, in first sleeve with drilling into basement rock, the depth that first sleeve enters basement rock is more than solution crack in basement rock
Depth.
Due to having solution crack close to the part of sandy soil in basement rock, solution crack part is not complete basement rock.Therefore, if first
The depth that casing enters basement rock is insufficient, makes first sleeve that can not pass through solution crack part, is in the milk under these conditions, still may be by
Lead to soil erosion in the imperfection of solution crack or collapses.First sleeve is set to enter depth of the depth more than solution crack in basement rock of basement rock
Degree can then occur to avoid this accident.
Preferably, in grouting, priority perfusion is carried out using the different slurries of the ratio of mud, first uses the higher slurry of the ratio of mud
Liquid is poured into a mould, and is reused the lower slurries of the ratio of mud and is poured into a mould.
It in grouting, is first poured into a mould using the higher slurries of the ratio of mud, the slurries for then using the ratio of mud relatively low
It is poured into a mould.The advantageous effect of this grouting operation is：First slip casting channel is dredged using the slurries of low concentration, is reached in proper order
Progressive purpose avoids the slurries for using high concentration at the beginning by channel blockage, effective filling effect is not achieved.
Further, first use the ratio of mud for 1:1 slurries are in the milk, and then turn to use the ratio of mud for 0.8:1
Slurries are in the milk, and finally use the ratio of mud for 0.6：1 slurries are in the milk, until reaching whole slurry standard.
Preferably, further comprising the steps of：
Supplement slip casting.
After the completion of grouting step, there may be different degrees of gaps in the second casing so that is easy in subsequent construction
Situations such as generating grout, therefore, after the completion of grouting, carries out supplement slip casting in the second casing.
Preferably, when supplementing slip casting, stop grouting plug is promoted to the position for being not more than 1m apart from ground, to stop grouting plug plus
Pressure carries out grouting operation.
Specifically, supplement slip casting is adopted and carried out with the aforedescribed process, principle is：By injected hole be stuffed entirely with it is closely knit after, remain
Remaining 1m depth can be completed directly by supplementing slip casting, can effectively complete injected hole closure, prevent follow-up shield driving
When grout etc..
Preferably, when supplementing slip casting, the ratio of mud of slurries is less than the ratio of mud of slurries in grouting step.
The slurries of consistency bigger can ensure that Grouting Pipe can be effectively full of, and can be coagulated in a relatively short period of time in confined space
Gu while occurring, compared with large fracture, reaching preferable plugging effect after preventing the later stage from solidifying.
Further, when supplementing slip casting, the ratio of mud of slurries is 0.5:1.
Preferably, it in grouting, is connected to flow instrument in Grouting Pipe and pressure gauge, grouting pressure is gradually carried with slip casting process
Height after reaching whole slurry standard, terminates slip casting.
It can solve have caused by grouting amount deficiency by default rational slurry standard eventually by above-mentioned method
Effect filling；Slurries enter layer of sand caused by can also avoiding grouting amount excess, the problems such as avoiding wasting.
Preferably, whole slurry standard is：When reaching design grouting termination pressure, if grouting flow is less than preset termination stream
Amount after continuing preset termination duration, terminates slip casting.
Preferably, design grouting termination pressure is 1.5Mpa-2.5Mpa, and preset termination flow is 25-35L/min, is preset
A length of 10-20min when termination.
Pressure when having considered whole slurry in whole slurry standard and the parameters such as flow of being in the milk so that when cut-off is starched eventually, slip casting
Amount is reasonable.
The advantageous effect of construction method provided by the invention is：
1. when boring large diameter hole, first sleeve can avoid sandstone from missing completely with pipe to rock stratum, essentially eliminate biography
System technique construct in the stratum existing for risk；
2. being provided with the second casing in first sleeve so that first sleeve can be taken out before grouting, avoid first sleeve
Harmful effect is generated to subsequent construction；
3. in filling process, determining slurry standard eventually by parameters such as pressure, flows, slip casting deficiency, slip casting can be solved
Amount can not hold the problems such as pressure.
4. in filling process, first poured into a mould using the higher slurries of the ratio of mud, reuses the lower slurries of the ratio of mud
Poured into a mould, achieve the purpose that it is incremental, avoid at the beginning use high concentration slurries by channel blockage, be not achieved and effectively fill out
Fill effect.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (14)
1. a kind of basement rock overlying sandy soil karst treatment construction method, which is characterized in that include the following steps：
Large diameter hole is bored, makes first sleeve with drilling into basement rock；
Grouting.
2. construction method according to claim 1, which is characterized in that further comprising the steps of before grouting step：
Small diameter bore is bored in the bottom of large diameter hole；
The second casing is placed in first sleeve, and the second casing and the basement rock of small diameter bore hole wall is made to be bonded；
The grouting step carries out in the second casing.
3. construction method according to claim 2, which is characterized in that the first sleeve is steel sleeve, described second
After casing is bonded with the basement rock of small diameter bore hole wall, follow the steps below：
Take out first sleeve.
4. construction method according to claim 2, which is characterized in that second casing is PPR pipe.
5. construction method according to claim 2, which is characterized in that in grouting, a part for stop grouting plug is embedded in
In second casing, another part is embedded in basement rock.
6. construction method according to claim 5, which is characterized in that in grouting, second is embedded in by the 1/3 of stop grouting plug
In casing, the 2/3 of stop grouting plug is embedded in basement rock.
7. construction method according to claim 1, which is characterized in that in the first sleeve with drilling into basement rock,
Sleeve enters depth of the depth more than solution crack in basement rock of basement rock.
8. construction method according to claim 1, which is characterized in that grouting when, using the different slurries of the ratio of mud into
Row is successively perfused, and is first poured into a mould using the higher slurries of the ratio of mud, reuses the lower slurries of the ratio of mud and poured into a mould.
9. construction method according to claim 1, which is characterized in that further comprising the steps of：
Supplement slip casting.
10. construction method according to claim 9, which is characterized in that in the supplement slip casting, stop grouting plug is promoted to
It is not more than the position of 1m apart from ground, pressurizes to stop grouting plug, carries out grouting operation.
11. construction method according to claim 10, which is characterized in that in the supplement slip casting, the ratio of mud of slurries
Less than the ratio of mud of slurries in grouting step.
12. construction method according to claim 1, which is characterized in that in the grouting, flow is connected on grout pipe
Instrument and pressure gauge, grouting pressure are gradually increased with slip casting process, after reaching whole slurry standard, terminate slip casting.
13. construction method according to claim 12, which is characterized in that it is described end slurry standard be：Reach design grouting
When termination pressure, if grouting flow is less than preset termination flow, after continuing preset termination duration, slip casting is terminated.
14. construction method according to claim 13, which is characterized in that the design grouting termination pressure is 1.5Mpa-
2.5Mpa, the preset termination flow are 25-35L/min, when preset termination a length of 10-20min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810312460.6A CN108411885A (en) | 2018-04-09 | 2018-04-09 | A kind of basement rock overlying sandy soil karst treatment construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810312460.6A CN108411885A (en) | 2018-04-09 | 2018-04-09 | A kind of basement rock overlying sandy soil karst treatment construction method |
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| CN108411885A true CN108411885A (en) | 2018-08-17 |
Family
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| CN201810312460.6A Pending CN108411885A (en) | 2018-04-09 | 2018-04-09 | A kind of basement rock overlying sandy soil karst treatment construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258567A (en) * | 2019-05-31 | 2019-09-20 | 李艳 | A kind of double-jacket tube passes through the grouting method of underground obstacle |
| CN110644516A (en) * | 2019-09-24 | 2020-01-03 | 湖南省城乡建设勘测院 | Curtain grouting construction method |
| CN111997620A (en) * | 2020-07-28 | 2020-11-27 | 中铁第四勘察设计院集团有限公司 | Grouting construction system and method for karst collapse area |
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|---|---|---|---|---|
| CN110258567A (en) * | 2019-05-31 | 2019-09-20 | 李艳 | A kind of double-jacket tube passes through the grouting method of underground obstacle |
| CN110644516A (en) * | 2019-09-24 | 2020-01-03 | 湖南省城乡建设勘测院 | Curtain grouting construction method |
| CN111997620A (en) * | 2020-07-28 | 2020-11-27 | 中铁第四勘察设计院集团有限公司 | Grouting construction system and method for karst collapse area |
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Address after: Jinniu District Kam Tong Road Chengdu city Sichuan province 610031 No. 16 Applicant after: China Railway Second Bureau Construction Co.,Ltd. Address before: Jinniu District Kam Tong Road Chengdu city Sichuan province 610031 No. 16 Applicant before: CHINA RAILWAY NO.2 ENGINEERING GROUP Co.,Ltd. |
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Effective date of registration: 20190731 Address after: Jinniu District Kam Tong Road Chengdu city Sichuan province 610031 No. 16 Applicant after: CHINA RAILWAY NO.2 ENGINEERING GROUP Co.,Ltd. Address before: Jinniu District Kam Tong Road Chengdu city Sichuan province 610031 No. 16 Applicant before: China Railway Second Bureau Construction Co.,Ltd. |
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