CN106087959A - A kind of grouting strengthening method of effective minimizing building foundation uneven settlement - Google Patents
A kind of grouting strengthening method of effective minimizing building foundation uneven settlement Download PDFInfo
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- CN106087959A CN106087959A CN201610509519.1A CN201610509519A CN106087959A CN 106087959 A CN106087959 A CN 106087959A CN 201610509519 A CN201610509519 A CN 201610509519A CN 106087959 A CN106087959 A CN 106087959A
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- slip casting
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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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Life Sciences & Earth Sciences (AREA)
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- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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Abstract
The present invention relates to the grouting strengthening method of a kind of effective minimizing building foundation uneven settlement, it obtains the positional information of excavation face of Tunnel footpath D in real time；Tunnel excavation face horizontal range L to building basis geometric center point is determined according to this positional information；When determining L=mD (m, for setting coefficient, determines) according to strata condition, the Peck curve formed according to footpath, tunneling hole determines the strengthening slip casting district in the footpath, tunneling hole on building basis and general slip casting district；Utilize pressure grout method that strengthening slip casting district and general slip casting district are carried out grouting and reinforcing；Utilize grouting pressure to control grouting amount, stop slip casting when strengthening when slip casting district final grouting pressure reaches the first setting intensity threshold, stop slip casting when general slip casting district final grouting pressure reaches the second setting intensity threshold.The present invention can make up the sedimentation that Stratum Loss brings effectively, makes the sedimentation in the middle part of subsider reach unanimity with both sides, reduces the relative settlement on building basis, and cost is few.
Description
Technical field
The present invention relates to tunnel construction field, particularly relate to the slip casting of a kind of effective minimizing building foundation uneven settlement
Reinforcement means.
Background technology
Along with national basis facility investment builds the increasing of dynamics, city underground and municipal pipeline project increase, under wear and build
The situation building thing happens occasionally.While digging building under, need the basic maximum settlement that strict control tunnel excavation causes
Amount.But for building, adverse conditions the most is not basis bulk settling, but relative settlement (differential settlement).Relatively
Big relative settlement can cause the inclination of building even to ftracture, especially for some skyscrapers, for relative settlement more
For sensitivity.
Tunnel construction field generally uses surface grouting for the measure controlling building base area stratum settlement at present
The method reinforced, if carried out the surface grouting of single intensity, the relatively low meeting of fastening strength of the single intensity slip casting in local causes difference to be sunk
Fall is relatively big, affects safety；Gamut list intensity grouting and reinforcing intensity is higher, though maximum settlement and relative settlement can be reduced, but
It is to cause bigger input, affects economy.
Summary of the invention
It is an object of the invention to for the problem that presently, there are, it is provided that a kind of effectively minimizing building foundation uneven settlement
Grouting strengthening method, it can effectively solve the problem that the differential settlement on building basis, and input cost is relatively low.
The purpose of the present invention is achieved through the following technical solutions:
The present invention provides the grouting strengthening method of a kind of effective minimizing building foundation uneven settlement, comprising:
Step S101, obtains the positional information of the excavation face of Tunnel footpath D in real time；
Step S102, according to the positional information of the excavation face in Tunnel footpath, determines that tunnel excavation face is several to building basis
Horizontal range L of what central point；
Step S103, when determining L=mD, wherein m is for setting coefficient, proceeds to step S104；
Step S104, the Peck curve formed according to footpath, tunneling hole determines the footpath, tunneling hole on building basis
Strengthening slip casting district and general slip casting district；
Step S105, utilizes pressure grout method that strengthening slip casting district and general slip casting district are carried out grouting and reinforcing；
Step S106, utilizes grouting pressure to control grouting amount, and when strengthening slip casting district, final grouting pressure reaches the first setting intensity
Stop slip casting during threshold value, stop slip casting when general slip casting district final grouting pressure reaches the second setting intensity threshold.
It is highly preferred that choose the stratum within the subsider width of the Peck curve that footpath, tunneling hole is formed as strengthening
Slip casting district, stratum in addition is general slip casting district.
More preferably, it is characterised in that, the long L1 in described strengthening slip casting district is true by the Peck curve shown in equation below
Fixed:
In formula: S (x) represents when the distance of this some distance tunnel centrage is x, the sedimentation value of this point；
SmaxRepresenting the sedimentation value on earth's surface directly over tunnel centrage, this sedimentation value is maximum；
I represents that subsider spread factor, the i.e. centrage in Tunnel footpath are to the distance of inflection point；
X represents the earth's surface certain point horizontal range to tunnel central axis；
The wide B1 in strengthening slip casting district is that building foundation width is plus 1.8m～2.2m；
The long L2 in general slip casting district is 2.5i times of Tunnel footpath D of stretching out from the outer in strengthening slip casting district, wherein
I be subsider spread factor；The wide B2 in general slip casting district is that building foundation width is plus 1.8m～2.2m.
It is highly preferred that during slip casting, the serosity that strengthening slip casting district and general slip casting district are used is cement-sodium silicate
Dual slurry.
It is highly preferred that described grouting strengthening method also includes:
Step S107, after mortar depositing construction terminates, core-drilling in injecting cement paste, check slip casting situation；
Step S108, by core censorship；
Step S109, it is judged that whether intensity and the serosity filling situation of core reach construction reference, the most then perform step
S110, continues from the radially outwardly extending tunneling in current tunnel hole；If it is not, then restart step S105.
It is highly preferred that according to the presetting period of cement grout, start boring after slip casting terminates after 45min～1h again and take
Core.
It is highly preferred that the intensity of institute's coring is not less than 1.0MPa.
By the technical scheme of the invention described above it can be seen that the present invention is by subregion slip casting, can not only effectively reduce
The problem of building foundation uneven settlement, but also taken into account safety and economy.From the knowledge of Probability, due to
Peck curve is normal distribution curve, and the stratum settlement in distance between its subsider width that is two inflection point account for whole
Tunnel excavation causes more than the 90% of stratum settlement, carries out this part region strengthening slip casting, can effectively make up Stratum Loss
The sedimentation brought, makes the sedimentation in the middle part of subsider reach unanimity with both sides, reduces the relative settlement on building basis.Keep away again simultaneously
That has exempted from that gamut high strength grouting brings puts into too high problem, it is ensured that engineering puts into the most controlled.
Accompanying drawing explanation
The flow chart of surface grouting scheme when Fig. 1 is tunneling；
Fig. 2 is the distance schematic diagram between tunnel and building basis；
Fig. 3 is the Peck curve synoptic diagram that footpath, tunneling hole is formed；
The stratum slip casting Division front view on building basis when Fig. 4 is tunneling；
The stratum slip casting Division top view on building basis when Fig. 5 is tunneling.
In accompanying drawing:
Peck curve 1；Strengthening slip casting district 2；General slip casting district 3；Building basis 4.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that the technical scheme of the application, below with reference to accompanying drawing to this
Bright it is described in further details.
In describing the invention, it is to be understood that in describing the invention, the implication of " multiple " refer to two or
Person's two or more, unless otherwise expressly limited specifically.
Embodiment one:
The present invention provides the grouting strengthening method of a kind of effective minimizing building foundation uneven settlement, and its implementing procedure is such as
Shown in Fig. 1, comprise the steps:
Step S101, obtains the positional information of the excavation face in Tunnel footpath (being designated as D) in real time；
The centrage in this Tunnel footpath overlaps with the centrage on building basis.
Step S102, according to the positional information of the excavation face in Tunnel footpath, determines that tunnel excavation face is several to building basis
The horizontal range of what central point, is designated as L (see Fig. 2)；
Step S103, it is judged that whether L=mD (wherein m is for setting coefficient, determines according to strata condition) sets up, if not becoming
Vertical, then proceed to step S101；If setting up, then proceed to step S104；
Determine whether tunnel excavation face reaches m times of Tunnel footpath D to horizontal range L of building basis geometric center point
Time, start the step of following grouting and reinforcing.In order to further ensure grouting effect, need to carry out surface grouting immediately and add
Solid step.
Step S104, determines building basis 4 according to the Peck curve 1 (as shown in Figure 3) that footpath, tunneling hole is formed
The strengthening slip casting district 2 in footpath, tunneling hole and general slip casting district 3 (as shown in Figure 4 and Figure 5).
Choose footpath, tunneling hole formed Peck curve 1 subsider width (this subsider width i.e. Peck curve 1
Distance between two inflection points) within stratum as strengthening slip casting district 2, stratum in addition is general slip casting district 3.
The wide B1 in strengthening slip casting district 2 is that building foundation width is plus 1.8m～2.2m, it is therefore preferable to 2m；Strengthening slip casting district
Length L1 of 2 is determined by the Peck curve 1 (as shown in Figure 3) shown in equation below 1 and formula 2:
L1=2i................................................ formula 2
In formula:
S (x) represents when the distance of this some distance tunnel centrage is x, the sedimentation value of this point；
SmaxRepresenting the sedimentation value on earth's surface directly over tunnel centrage, this sedimentation value is maximum；
I represents that subsider spread factor, the i.e. centrage in Tunnel footpath are to the distance of inflection point；
X represents the earth's surface certain point horizontal range to tunnel central axis.
The wide B2 in general slip casting district 3 is that building foundation width is plus 1.8m～2.2m, it is therefore preferable to 2m；General slip casting district
The long L2 of 3 is to stretch out from the outer in strengthening slip casting district 2 that (i therein is subsider width system for the 2.5i of Tunnel footpath D
Number) times.
Step S105, utilizes pressure grout method that strengthening slip casting district 2 and general slip casting district 3 are carried out grouting and reinforcing.
During slip casting, the serosity that strengthening slip casting district 2 and general slip casting district 3 are used is cement-sodium silicate double liquid.
Step S106, utilizes grouting pressure to control grouting amount, and when strengthening slip casting district 2, final grouting pressure reaches the first setting intensity
Stop slip casting during threshold value, stop slip casting when general slip casting district 3 final grouting pressure reaches the second setting intensity threshold.
Generally, first intensity threshold is set as 1.5MPa；Second sets intensity threshold as 0.5MPa.
Step S107, after mortar depositing construction terminates, core-drilling in injecting cement paste, check slip casting situation.
After slip casting terminates, according to the presetting period of cement grout, start again after 45min～1h boring take one or
Multiple cores.When drilling through multiple core, take diverse location region and drill through.
During boring coring, using special rig, the length of core controls 10～15cm, diameter control 5～
8cm。
Step S108, by core censorship.
Step S109, it is judged that whether intensity and the serosity filling situation of core reach construction reference, the most then perform step
S110, continues from the radially outwardly extending tunneling in current tunnel hole；If it is not, then restart step S105.
Generally, the intensity of institute's coring is i.e. thought do not reach construction reference less than 1.0MPa.
The slip casting degree of depth in above-mentioned strengthening slip casting district 2 and general slip casting district 3 is the conventional slip casting degree of depth, according to fabric
Fixed.
The present invention determines the general note of maximally effective strengthening slip casting district 2 and periphery based on Peck curve and Probability knowledge
Slurry district 3, by subregion slip casting, the problem that can not only effectively reduce building foundation uneven settlement, but also takes into account
Safety and economy.
Embodiment two:
Difference between the embodiment of the present invention two and embodiment one is, only includes in embodiment one in this embodiment two
Step S101-S106.The uneven of tunnel construction thing basis i.e. it is effectively reduced by the grouting and reinforcing process of these steps
Sedimentation.
Although the present invention is open as above with preferred embodiment, but embodiment does not limit the present invention.Without departing from this
In bright spirit and scope, any equivalence change done or retouching, also belong to the protection domain of the present invention.Therefore the present invention
The content that should be defined with claims hereof of protection domain as standard.
Claims (7)
1. the grouting strengthening method of an effective minimizing building foundation uneven settlement, it is characterised in that described grouting and reinforcing
Method includes:
Step S101, obtains the positional information of the excavation face of Tunnel footpath D in real time；
Step S102, according to the positional information of the excavation face in Tunnel footpath, determines that tunnel excavation face is in the geometry of building basis
Horizontal range L of heart point；
Step S103, when determining L=mD, wherein m is for setting coefficient, proceeds to step S104；
Step S104, the Peck curve (1) formed according to footpath, tunneling hole determines the tunneling hole of building basis (4)
The strengthening slip casting district (2) in footpath and general slip casting district (3)；
Step S105, utilizes pressure grout method that strengthening slip casting district (2) and general slip casting district (3) are carried out grouting and reinforcing；
Step S106, utilizes grouting pressure to control grouting amount, when strengthening slip casting district (2) final grouting pressure reaches the first setting intensity threshold
Stop slip casting during value, stop slip casting when general slip casting district (3) final grouting pressure reaches the second setting intensity threshold.
The grouting strengthening method of a kind of effective minimizing building foundation uneven settlement the most according to claim 1, it is special
Levy and be,
Choose footpath, tunneling hole formed Peck curve (1) subsider width within stratum as strengthening slip casting district (2),
Stratum in addition is general slip casting district (3).
The grouting strengthening method of a kind of effective minimizing building foundation uneven settlement the most according to claim 2, it is special
Levying and be, the long L1 of described strengthening slip casting district (2) is determined by the Peck curve (1) shown in equation below:
In formula: S (x) represents when the distance of this some distance tunnel centrage is x, the sedimentation value of this point；
SmaxRepresenting the sedimentation value on earth's surface directly over tunnel centrage, this sedimentation value is maximum；
I represents that subsider spread factor, the i.e. centrage in Tunnel footpath are to the distance of inflection point；
X represents the earth's surface certain point horizontal range to tunnel central axis；
The wide B1 of strengthening slip casting district (2) is that building foundation width is plus 1.8m～2.2m；
The long L2 in general slip casting district (3) be 2.5i times of Tunnel footpath D of stretching out from the outer strengthening slip casting district (2), its
In i be subsider spread factor；The wide B2 in general slip casting district (3) is that building foundation width is plus 1.8m～2.2m.
4. add according to the slip casting of a kind of effective minimizing building foundation uneven settlement described in claims 1 to 3 any one
Solid method, it is characterised in that during slip casting, the serosity that strengthening slip casting district (2) and general slip casting district (3) are used is water
Mud-waterglass dual slurry.
The grouting strengthening method of a kind of effective minimizing building foundation uneven settlement the most according to claim 4, it is special
Levying and be, described grouting strengthening method also includes:
Step S107, after mortar depositing construction terminates, core-drilling in injecting cement paste, check slip casting situation；
Step S108, by core censorship；
Step S109, it is judged that whether intensity and the serosity filling situation of core reach construction reference, the most then perform step
S110, continues from the radially outwardly extending tunneling in current tunnel hole；If it is not, then restart step S105.
The grouting strengthening method of a kind of effective minimizing building foundation uneven settlement the most according to claim 5, it is special
Levy and be, according to the presetting period of cement grout, after slip casting terminates, after 45min～1h, start coring of holing again.
The grouting strengthening method of a kind of effective minimizing building foundation uneven settlement the most according to claim 6, it is special
Levying and be, the intensity of institute's coring is not less than 1.0MPa.
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| CN201610509519.1A CN106087959B (en) | 2016-06-30 | 2016-06-30 | A kind of effective grouting strengthening method for reducing building foundation uneven settlement |
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| CN201610509519.1A CN106087959B (en) | 2016-06-30 | 2016-06-30 | A kind of effective grouting strengthening method for reducing building foundation uneven settlement |
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| CN106087959B CN106087959B (en) | 2018-05-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106968689A (en) * | 2017-03-21 | 2017-07-21 | 北京市政建设集团有限责任公司 | A kind of subregion for being adapted to the construction of tunnel proximate building strong grouting strengthening method such as not |
| CN112796765A (en) * | 2021-01-07 | 2021-05-14 | 中铁十九局集团第三工程有限公司 | Partitioned grouting reinforcement method for tunnel adjacent building construction |
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| CN102704937A (en) * | 2011-03-28 | 2012-10-03 | 同济大学 | Method for identifying settlement pattern during shield tunnel construction |
| CN102967481A (en) * | 2012-12-13 | 2013-03-13 | 青岛理工大学 | Method for determining action relationship between ground building and underground structure |
| JP5378860B2 (en) * | 2009-03-31 | 2013-12-25 | 住友林業株式会社 | Foundation structure of buildings in soft ground |
| CN103628920A (en) * | 2013-11-07 | 2014-03-12 | 广州市地下铁道总公司 | Early-warning and prediction method for sedimentation nearby tunnel construction working face |
| CN104965994A (en) * | 2015-07-17 | 2015-10-07 | 青岛理工大学 | Method for measuring and estimating characteristic parameters of surface subsidence caused by subway tunnel construction |
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2016
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5378860B2 (en) * | 2009-03-31 | 2013-12-25 | 住友林業株式会社 | Foundation structure of buildings in soft ground |
| CN102704937A (en) * | 2011-03-28 | 2012-10-03 | 同济大学 | Method for identifying settlement pattern during shield tunnel construction |
| CN102967481A (en) * | 2012-12-13 | 2013-03-13 | 青岛理工大学 | Method for determining action relationship between ground building and underground structure |
| CN103628920A (en) * | 2013-11-07 | 2014-03-12 | 广州市地下铁道总公司 | Early-warning and prediction method for sedimentation nearby tunnel construction working face |
| CN104965994A (en) * | 2015-07-17 | 2015-10-07 | 青岛理工大学 | Method for measuring and estimating characteristic parameters of surface subsidence caused by subway tunnel construction |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106968689A (en) * | 2017-03-21 | 2017-07-21 | 北京市政建设集团有限责任公司 | A kind of subregion for being adapted to the construction of tunnel proximate building strong grouting strengthening method such as not |
| CN112796765A (en) * | 2021-01-07 | 2021-05-14 | 中铁十九局集团第三工程有限公司 | Partitioned grouting reinforcement method for tunnel adjacent building construction |
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Inventor after: Lian Xinzeng Inventor after: Zhu Xu Inventor after: Wang Hongbin Inventor after: Huang Mingli Inventor after: Li Jingyun Inventor after: Wang Haitao Inventor after: Zhao Jianming Inventor after: Qian Wenbin Inventor before: Lian Xinzeng Inventor before: Zhu Xu Inventor before: Huang Mingli Inventor before: Li Jingyun Inventor before: Wang Haitao Inventor before: Zhao Jianming Inventor before: Qian Wenbin |
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